NJM2368

- 1 -Ver2004-06-03

SWITCHING REGULATOR CONTROL IC FOR FLYBACK

GENERAL DESCRIPTION PACKAGE OUTLINE FEATURES Operating Voltage (36V ~ 32V) Wide Oscillator Range (5kHz ~ 350 kHz) Soft-Start function Under Voltage Lockouts (UVLO) Bipolar Technology Package Outline DIP8 DMP8 EMP8 SSOP8

BLOCK DIAGRAM

1

VREF

V+

ERsdotAMP

LO

500Ω

UVLO

OSC

PWM

8 7 6 5

432

CSCTREF

IN- OUTGNDFB

052V

SCP

30uA

The NJM2368 is a high speed switching regulator control ICwhich can operate at low voltage It uses a totempole output circuit so that it can drive anexternal Bipolar Transistor directly It is suitable for applications of flyback type switchingregulation of up to 10W NJM2368D NJM2368M

NJM2368E NJM2368V

1 IN- 2 FB 3 GND 4 OUT 5 V+ 6 CS 7 CT 8 REF

PIN FUNCTION

NJM2368

- 2 - Ver2004-06-03

ABSOLUTE MAXIMUM RATINGS (Ta=25degC)

PARAMETER SYMBOL MAXIMUM RATINGS UNIT Input Voltage V+ 36 V Reference Output Current IOR 10 mA Output Current IO plusmn50 mA

Power Dissipation PD

(DIP 8) 700 (DMP 8) 300 (EMP 8) 300 (SSOP 8) 250

mW

Operating Temperature Range TOPR -40 ~ +85 degC Storage Temperature Range TSTG -50 ~ 125 degC

RECOMMENDED OPERATING CONDITIONS (V+=6V Ta=25degC)

PARAMETER SYMBOL RATINGS MIN MAX UNIT Operating Voltage V+ 36 32 V Feed Back Resistor RNF 100 kΩ Oscillator Timing Capacitor CT 220 22000 pF Oscillator Timing Resistor RT 10 100 kΩ Oscillate fOSC 5 350 kHz

ELECTRICAL CHARACTERISTICS (V+=6V RT=33kΩ CT=1000pF Ta=25degC) REFERENCE VOLTAGE BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITOutput Voltage VREF IOR=1mA 245 250 255 V Line Regulation LINE V+=36V ~ 32V IOR=1mA 68 207 mV Load Regulation LOAD IOR=01mA ~ 50mA 5 30 mV

OSCILLATOR BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITOscillate fosc CT=1000pF RT=33kΩ 85 105 125 kHz Oscillate Fluctuations1

(Line Fluctuations)fdv V+=36V ~ 32V 1

Oscillate Fluctuations2 (Temp Fluctuations)

fdt Ta=-40degC ~ +85degC 5

ERROR AMPLIFIER BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITReference Voltage VB 051 052 053 V Input Bias Current IB 5 100 nA Open Loop Gain AV 90 dB Gain Band width Product GB 06 MHz

VOM+ RNF=100kΩ VREF-02 V Maximum Output Voltage (FB Pin) VOM- RNF=100kΩ 200 mV

Output Source Current (FB Pin) IOM+ VOM=1V 40 85 200 uA

NJM2368

- 3 -Ver2004-06-03

ELECTRICAL CHARACTERISTICS (V+=6V RT=33kΩ CT=1000pF Ta=25degC) PWM COMPARATE BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTH0 dutycycle=0 055 065 V

Input Threshold Voltage (FB Pin) VTH50 dutycycle=50 087 V

Maximum Duty Cycle αM FB Pin=12V 55 64 85 SOFT START CIRCUIT BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Bias Current (CS Pin) IBCS 250 650 nA Input Threshold Voltage

(CS Pin) VTHCS0 dutycycle=0 025 035 V

Input Threshold Voltage (CS Pin) VTHCS50 dutycycle=50 052 V

SHORT CIRCUIT PROTECTION

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTHPC 120 150 180 V

Charge Current (CS Pin) ICHG CS Pin=0V FB Pin=2V 10 30 50 uA Latch mode Threshold Voltage

(CS Pin) VTHLA 120 150 180 V

UNDER VOLTAGE LOCKOUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITON Threshold Voltage VTHON 270 V OFF Threshold Voltage VTHOFF 252 V Hysteresis Voltage VHYS 60 180 mV

OUTPUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITH-Output Voltage (OUT Pin) VOH RL=10kΩ 350 400 V L-Output Voltage (OUT Pin) VOL Output Sink Current =20mA 025 065 V Output Source Current

(OUT Pin) ISOURCE OUT Pin=0V 8 11 mA

GENERAL CHARACTERISTIC

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITQuiescent Current ICCLA Latch Mode 16 22 mA Average Quiescent Current ICCAV RL=infin dutycycle=50 35 48 mA

NJM2368

- 4 - Ver2004-06-03

TYPICAL APPLICATIONS

RT36kΩ

GND

V+

VOUT+5V

Rsf 330kΩ

Rsr 180kΩ

Cs 47uF

CT 1000pF

1

VREF

ERsdotAMP

LO

500Ω UVLO

OSC

PWM

8 7 6 5

43 2

052V

SCP

30uA

GND

CIN

Q1RNF 1MΩ

CLP 2200pF

R2 22kΩ

D1

R1 22kΩ

COUT

N1 N2

2kΩ

100kΩ

When Short Circuit Protection (SCP) is activated Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off

However small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device

To avoid this issue insert a 100kΩ resistor between the Gate and the Source of the external transistor

NJM2368

- 5 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12

H Output Voltage vs Source Current(V+=6V RT=33kΩ CT=1000pF OUT Pin=0V Ta=25oC)

Source Current ISOURCE

(mA)

H O

utpu

t Vol

tage

VO

H (V

)

0

02

04

06

08

1

0 10 20 30 40 50 60

L Output Voltage vs Sink Current(V+=6V RT=33kΩ CT=1000pF Ta=25oC)

Sink Current ISINK

(mA)

L O

utpu

t Vol

tage

VO

L (V)

1

10

100

1000

1 10 100 1000 10000

Oscillator Frequency vs Timing Resistor(V+=6V Ta=25oC)

Timing Resistor RT (kΩ)

Osc

illato

r Fre

quen

cy f

OS

C (k

Hz)

CT=1000pF

CT=470pF

1

10

100

1000

10 100 1000 10000 100000

RT=33kΩ

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Timing Capacitor(V+=6V Ta=25oC)

Timing Capacitor CT (pF)

RT=100kΩ

RT=10kΩ

248

249

25

251

252

0 10 20 30 40

Reference Voltage vs Operating Voltage(V+=6V Ta=25oC)

Operating Voltage V+ (V)

Ref

eren

ce V

olta

ge V

RE

F (V)

0

1

2

3

4

5

6

0 10 20 30 40

Operating Current vs Operating Voltage(Ta=25oC)

Operating Voltage V+ (V)

Ope

ratin

g C

urre

nt I

CC (

mA) ICCAV

ICCLA

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 2 - Ver2004-06-03

ABSOLUTE MAXIMUM RATINGS (Ta=25degC)

PARAMETER SYMBOL MAXIMUM RATINGS UNIT Input Voltage V+ 36 V Reference Output Current IOR 10 mA Output Current IO plusmn50 mA

Power Dissipation PD

(DIP 8) 700 (DMP 8) 300 (EMP 8) 300 (SSOP 8) 250

mW

Operating Temperature Range TOPR -40 ~ +85 degC Storage Temperature Range TSTG -50 ~ 125 degC

RECOMMENDED OPERATING CONDITIONS (V+=6V Ta=25degC)

PARAMETER SYMBOL RATINGS MIN MAX UNIT Operating Voltage V+ 36 32 V Feed Back Resistor RNF 100 kΩ Oscillator Timing Capacitor CT 220 22000 pF Oscillator Timing Resistor RT 10 100 kΩ Oscillate fOSC 5 350 kHz

ELECTRICAL CHARACTERISTICS (V+=6V RT=33kΩ CT=1000pF Ta=25degC) REFERENCE VOLTAGE BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITOutput Voltage VREF IOR=1mA 245 250 255 V Line Regulation LINE V+=36V ~ 32V IOR=1mA 68 207 mV Load Regulation LOAD IOR=01mA ~ 50mA 5 30 mV

OSCILLATOR BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITOscillate fosc CT=1000pF RT=33kΩ 85 105 125 kHz Oscillate Fluctuations1

(Line Fluctuations)fdv V+=36V ~ 32V 1

Oscillate Fluctuations2 (Temp Fluctuations)

fdt Ta=-40degC ~ +85degC 5

ERROR AMPLIFIER BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITReference Voltage VB 051 052 053 V Input Bias Current IB 5 100 nA Open Loop Gain AV 90 dB Gain Band width Product GB 06 MHz

VOM+ RNF=100kΩ VREF-02 V Maximum Output Voltage (FB Pin) VOM- RNF=100kΩ 200 mV

Output Source Current (FB Pin) IOM+ VOM=1V 40 85 200 uA

NJM2368

- 3 -Ver2004-06-03

ELECTRICAL CHARACTERISTICS (V+=6V RT=33kΩ CT=1000pF Ta=25degC) PWM COMPARATE BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTH0 dutycycle=0 055 065 V

Input Threshold Voltage (FB Pin) VTH50 dutycycle=50 087 V

Maximum Duty Cycle αM FB Pin=12V 55 64 85 SOFT START CIRCUIT BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Bias Current (CS Pin) IBCS 250 650 nA Input Threshold Voltage

(CS Pin) VTHCS0 dutycycle=0 025 035 V

Input Threshold Voltage (CS Pin) VTHCS50 dutycycle=50 052 V

SHORT CIRCUIT PROTECTION

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTHPC 120 150 180 V

Charge Current (CS Pin) ICHG CS Pin=0V FB Pin=2V 10 30 50 uA Latch mode Threshold Voltage

(CS Pin) VTHLA 120 150 180 V

UNDER VOLTAGE LOCKOUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITON Threshold Voltage VTHON 270 V OFF Threshold Voltage VTHOFF 252 V Hysteresis Voltage VHYS 60 180 mV

OUTPUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITH-Output Voltage (OUT Pin) VOH RL=10kΩ 350 400 V L-Output Voltage (OUT Pin) VOL Output Sink Current =20mA 025 065 V Output Source Current

(OUT Pin) ISOURCE OUT Pin=0V 8 11 mA

GENERAL CHARACTERISTIC

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITQuiescent Current ICCLA Latch Mode 16 22 mA Average Quiescent Current ICCAV RL=infin dutycycle=50 35 48 mA

NJM2368

- 4 - Ver2004-06-03

TYPICAL APPLICATIONS

RT36kΩ

GND

V+

VOUT+5V

Rsf 330kΩ

Rsr 180kΩ

Cs 47uF

CT 1000pF

1

VREF

ERsdotAMP

LO

500Ω UVLO

OSC

PWM

8 7 6 5

43 2

052V

SCP

30uA

GND

CIN

Q1RNF 1MΩ

CLP 2200pF

R2 22kΩ

D1

R1 22kΩ

COUT

N1 N2

2kΩ

100kΩ

When Short Circuit Protection (SCP) is activated Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off

However small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device

To avoid this issue insert a 100kΩ resistor between the Gate and the Source of the external transistor

NJM2368

- 5 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12

H Output Voltage vs Source Current(V+=6V RT=33kΩ CT=1000pF OUT Pin=0V Ta=25oC)

Source Current ISOURCE

(mA)

H O

utpu

t Vol

tage

VO

H (V

)

0

02

04

06

08

1

0 10 20 30 40 50 60

L Output Voltage vs Sink Current(V+=6V RT=33kΩ CT=1000pF Ta=25oC)

Sink Current ISINK

(mA)

L O

utpu

t Vol

tage

VO

L (V)

1

10

100

1000

1 10 100 1000 10000

Oscillator Frequency vs Timing Resistor(V+=6V Ta=25oC)

Timing Resistor RT (kΩ)

Osc

illato

r Fre

quen

cy f

OS

C (k

Hz)

CT=1000pF

CT=470pF

1

10

100

1000

10 100 1000 10000 100000

RT=33kΩ

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Timing Capacitor(V+=6V Ta=25oC)

Timing Capacitor CT (pF)

RT=100kΩ

RT=10kΩ

248

249

25

251

252

0 10 20 30 40

Reference Voltage vs Operating Voltage(V+=6V Ta=25oC)

Operating Voltage V+ (V)

Ref

eren

ce V

olta

ge V

RE

F (V)

0

1

2

3

4

5

6

0 10 20 30 40

Operating Current vs Operating Voltage(Ta=25oC)

Operating Voltage V+ (V)

Ope

ratin

g C

urre

nt I

CC (

mA) ICCAV

ICCLA

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 3 -Ver2004-06-03

ELECTRICAL CHARACTERISTICS (V+=6V RT=33kΩ CT=1000pF Ta=25degC) PWM COMPARATE BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTH0 dutycycle=0 055 065 V

Input Threshold Voltage (FB Pin) VTH50 dutycycle=50 087 V

Maximum Duty Cycle αM FB Pin=12V 55 64 85 SOFT START CIRCUIT BLOCK

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Bias Current (CS Pin) IBCS 250 650 nA Input Threshold Voltage

(CS Pin) VTHCS0 dutycycle=0 025 035 V

Input Threshold Voltage (CS Pin) VTHCS50 dutycycle=50 052 V

SHORT CIRCUIT PROTECTION

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITInput Threshold Voltage

(FB Pin)VTHPC 120 150 180 V

Charge Current (CS Pin) ICHG CS Pin=0V FB Pin=2V 10 30 50 uA Latch mode Threshold Voltage

(CS Pin) VTHLA 120 150 180 V

UNDER VOLTAGE LOCKOUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITON Threshold Voltage VTHON 270 V OFF Threshold Voltage VTHOFF 252 V Hysteresis Voltage VHYS 60 180 mV

OUTPUT

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITH-Output Voltage (OUT Pin) VOH RL=10kΩ 350 400 V L-Output Voltage (OUT Pin) VOL Output Sink Current =20mA 025 065 V Output Source Current

(OUT Pin) ISOURCE OUT Pin=0V 8 11 mA

GENERAL CHARACTERISTIC

PARAMETER SYMBOL RATINGS MIN TYP MAX UNITQuiescent Current ICCLA Latch Mode 16 22 mA Average Quiescent Current ICCAV RL=infin dutycycle=50 35 48 mA

NJM2368

- 4 - Ver2004-06-03

TYPICAL APPLICATIONS

RT36kΩ

GND

V+

VOUT+5V

Rsf 330kΩ

Rsr 180kΩ

Cs 47uF

CT 1000pF

1

VREF

ERsdotAMP

LO

500Ω UVLO

OSC

PWM

8 7 6 5

43 2

052V

SCP

30uA

GND

CIN

Q1RNF 1MΩ

CLP 2200pF

R2 22kΩ

D1

R1 22kΩ

COUT

N1 N2

2kΩ

100kΩ

When Short Circuit Protection (SCP) is activated Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off

However small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device

To avoid this issue insert a 100kΩ resistor between the Gate and the Source of the external transistor

NJM2368

- 5 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12

H Output Voltage vs Source Current(V+=6V RT=33kΩ CT=1000pF OUT Pin=0V Ta=25oC)

Source Current ISOURCE

(mA)

H O

utpu

t Vol

tage

VO

H (V

)

0

02

04

06

08

1

0 10 20 30 40 50 60

L Output Voltage vs Sink Current(V+=6V RT=33kΩ CT=1000pF Ta=25oC)

Sink Current ISINK

(mA)

L O

utpu

t Vol

tage

VO

L (V)

1

10

100

1000

1 10 100 1000 10000

Oscillator Frequency vs Timing Resistor(V+=6V Ta=25oC)

Timing Resistor RT (kΩ)

Osc

illato

r Fre

quen

cy f

OS

C (k

Hz)

CT=1000pF

CT=470pF

1

10

100

1000

10 100 1000 10000 100000

RT=33kΩ

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Timing Capacitor(V+=6V Ta=25oC)

Timing Capacitor CT (pF)

RT=100kΩ

RT=10kΩ

248

249

25

251

252

0 10 20 30 40

Reference Voltage vs Operating Voltage(V+=6V Ta=25oC)

Operating Voltage V+ (V)

Ref

eren

ce V

olta

ge V

RE

F (V)

0

1

2

3

4

5

6

0 10 20 30 40

Operating Current vs Operating Voltage(Ta=25oC)

Operating Voltage V+ (V)

Ope

ratin

g C

urre

nt I

CC (

mA) ICCAV

ICCLA

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 4 - Ver2004-06-03

TYPICAL APPLICATIONS

RT36kΩ

GND

V+

VOUT+5V

Rsf 330kΩ

Rsr 180kΩ

Cs 47uF

CT 1000pF

1

VREF

ERsdotAMP

LO

500Ω UVLO

OSC

PWM

8 7 6 5

43 2

052V

SCP

30uA

GND

CIN

Q1RNF 1MΩ

CLP 2200pF

R2 22kΩ

D1

R1 22kΩ

COUT

N1 N2

2kΩ

100kΩ

When Short Circuit Protection (SCP) is activated Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off

However small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device

To avoid this issue insert a 100kΩ resistor between the Gate and the Source of the external transistor

NJM2368

- 5 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12

H Output Voltage vs Source Current(V+=6V RT=33kΩ CT=1000pF OUT Pin=0V Ta=25oC)

Source Current ISOURCE

(mA)

H O

utpu

t Vol

tage

VO

H (V

)

0

02

04

06

08

1

0 10 20 30 40 50 60

L Output Voltage vs Sink Current(V+=6V RT=33kΩ CT=1000pF Ta=25oC)

Sink Current ISINK

(mA)

L O

utpu

t Vol

tage

VO

L (V)

1

10

100

1000

1 10 100 1000 10000

Oscillator Frequency vs Timing Resistor(V+=6V Ta=25oC)

Timing Resistor RT (kΩ)

Osc

illato

r Fre

quen

cy f

OS

C (k

Hz)

CT=1000pF

CT=470pF

1

10

100

1000

10 100 1000 10000 100000

RT=33kΩ

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Timing Capacitor(V+=6V Ta=25oC)

Timing Capacitor CT (pF)

RT=100kΩ

RT=10kΩ

248

249

25

251

252

0 10 20 30 40

Reference Voltage vs Operating Voltage(V+=6V Ta=25oC)

Operating Voltage V+ (V)

Ref

eren

ce V

olta

ge V

RE

F (V)

0

1

2

3

4

5

6

0 10 20 30 40

Operating Current vs Operating Voltage(Ta=25oC)

Operating Voltage V+ (V)

Ope

ratin

g C

urre

nt I

CC (

mA) ICCAV

ICCLA

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 5 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

1

2

3

4

5

6

7

8

0 2 4 6 8 10 12

H Output Voltage vs Source Current(V+=6V RT=33kΩ CT=1000pF OUT Pin=0V Ta=25oC)

Source Current ISOURCE

(mA)

H O

utpu

t Vol

tage

VO

H (V

)

0

02

04

06

08

1

0 10 20 30 40 50 60

L Output Voltage vs Sink Current(V+=6V RT=33kΩ CT=1000pF Ta=25oC)

Sink Current ISINK

(mA)

L O

utpu

t Vol

tage

VO

L (V)

1

10

100

1000

1 10 100 1000 10000

Oscillator Frequency vs Timing Resistor(V+=6V Ta=25oC)

Timing Resistor RT (kΩ)

Osc

illato

r Fre

quen

cy f

OS

C (k

Hz)

CT=1000pF

CT=470pF

1

10

100

1000

10 100 1000 10000 100000

RT=33kΩ

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Timing Capacitor(V+=6V Ta=25oC)

Timing Capacitor CT (pF)

RT=100kΩ

RT=10kΩ

248

249

25

251

252

0 10 20 30 40

Reference Voltage vs Operating Voltage(V+=6V Ta=25oC)

Operating Voltage V+ (V)

Ref

eren

ce V

olta

ge V

RE

F (V)

0

1

2

3

4

5

6

0 10 20 30 40

Operating Current vs Operating Voltage(Ta=25oC)

Operating Voltage V+ (V)

Ope

ratin

g C

urre

nt I

CC (

mA) ICCAV

ICCLA

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 6 - Ver2004-06-03

TYPICAL CHARACTERISTICS

60

80

100

120

140

160

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Osc

illato

r Fre

quen

cy f

OS

C (

kHz)

Oscillator Frequency vs Temperature(V+=6V RT=33kΩ CT=1000pF)

2

22

24

26

28

3

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Ref

erec

e Vo

ltage

VR

EF (

V)

Referece Voltage vs Temperature(V+=6V IOR=1mA)

0

2

4

6

8

10

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

H O

utpu

t Vol

tage

VO

H (

V)

H Output Voltage vs Temperature(V+=6V RL=10kΩ RT=33kΩ CT=1000pF)

0

01

02

03

04

05

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

L O

utpu

t Vol

tage

VO

L (V)

L Output Voltage vs Temperature(V+=6V ISINK=20mA RT=33kΩ CT=1000pF)

1

12

14

16

18

2

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Qui

esce

nt C

urre

ntI C

CLA

(m

A)

Quiescent Current vs Temperature(Latch Mode V+=6V RT=33kΩ CT=1000pF)

0

1

2

3

4

5

-50 -25 0 25 50 75 100 125Ambient Temperature Ta (oC)

Aver

age

Qui

esce

nt C

urre

ntI C

CA

V (m

A)

Average Quiescent Current vs Temperature(V+=6V RL=infin duty cycle=50 RT=33kΩ CT=1000pF)

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights

NJM2368

- 7 -Ver2004-06-03

TYPICAL CHARACTERISTICS

0

10

20

30

40

50

60

70

80

10 100 1000

Maximum Duty Cycle vs Oscillator Frequency(V+=6V Ta=25oC)

Oscillator Frequency fOSC (kHz)

Max

imum

Dut

y C

ycle

αM

()

0

10

20

30

40

50

60

70

80

0 01 02 03 04 05 06 07 08

Duty Cycle vs CS Pin Voltage(V+=6V Ta=25oC)

CS Pin Voltage VTHCS

(V)

Dut

y C

ycle

α (

)

[CAUTION] The specifications on this databook are only

given for information without any guarantee as regards either mistakes or omissions The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights