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Supertex inc.
Supertex inc. www.supertex.com
HV9971DB1
Doc.# DSDB-HV9971DB1A032913
Isolated, Constant CurrentHV9971 LED Driver Demoboard
Board Layout and Connection Diagram
1. Input Voltage: Connect the AC input voltage between in-put terminals as shown.
2. LED String: Connect the LED strings between +VO and -VO as shown (anode of the string to +VO and cathode to -VO).
3. DC Voltage: Use terminals either for measurement of the bus voltage or the DC voltage input
Connections
VAC = 180 - 265VAC VOUT = 18 - 24V
IOUT = 330mA
+-
- +
Terminals forMonitoringBus Voltage
Specification ValueInput line voltage 180 – 265VACOutput voltage 18 – 24VOutput current 330mASwitching frequency 75 – 120kHz
Typical efficiency 82%@Low Line,81%@High Line
Open LED protection 30VOutput short circuit protection HiccupPower factor ≥82%
Specifications
2
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
HV9971DB1 Schematic Diagram
BR
1
VD VIN
BIA
S
PWM
D
3 2 1 4
8 7 6 5
U1
HV9
971
9 10 8 7 6
T1
G
D S
M1
IRFU
C20
PB
F
C7
680p
F25
0vA
C
D4
ES
1M(S
MA
)
D3
ES
1D(S
MA
)D
21N
4148
(SO
D12
3)
RF1 10
+VIN
-VO
+VO
AC
1
AC
2
R1 10
(not
inst
alle
d)
R2 10
(not
inst
alle
d)
R6 0
1/2W
GN
D
PW
MD
C1
0.1µ
F40
0V
(2.8
25)
VDD
GA
TE
GN
D CS
1 2 3 4 5
+ -
C11
47nF
500V
C9
47nF
500V
C10
3.3µ
F40
0V
L 222
00µH
C2
3.3µ
F40
0V
C4
22µF
16V
C6
20pF
630V
C8
10µF 50V
(121
0)C
30.
5pF
(060
3)
C5
10pF
RB
IAS
13.3
k
RS
-A3.
48(1
206)
RS
-B15 (1
206)
RD
D37
41/
4W
R5
1.1k
1/4W
R4
1.91
k
R3
10
L 122
00µH
D5
ES
1M(S
MA
)
D6
ES
1M(S
MA
)
RD
93.1
k(1
206)
RIN
953k
(120
6)
D1
US
1J(S
MA
)
VR
1B
ZG03
C18
0(S
MA
)
Not
e: B
ias
win
ding
of t
his
trans
form
er (p
ins
4, 5
) is
used
in F
ORW
ARD
conn
ectio
n!Se
e pa
ge 1
0 fo
r tra
nsfo
rmer
elec
trica
l dia
gram
.
3
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
PCB Layout
Through-Hole Component Side
Solder Side
4
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
PCB Assembly Drawings
Through-Hole Component Side
Solder Side
5
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
Typical Characteristics
Figure 1. DC Line Regulation
Figure 2. DC Efficiency @25OC
VDCIN, V
350
340
330
320
310
300
290
280
270
I OU
T, (m
A)
120 140 160 180 200 220 240 260 280 300 320 340 360
VOUT = 24.4VVOUT = 18.4V103% *lOUT,NOM
97% *IOUT,NOM
Effic
ienc
y (%
)
VDCIN, (V)
100
95
90
85
80
75
70
65
60
55
50120 140 160 180 200 220 240 260 280 300 320 340 360
VOUT = 24.4VVOUT = 14.4V
Figure 3. AC Line Regulation
350
340
330
320
310
300
290
280
270
I OU
T, (m
A)
VACIN, (V)
180 190 200 210 220 230 240 250 260 270 280
VOUT = 24.4VVOUT = 18.4V103% *lOUT,NOM
97% *IOUT,NOM
6
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
Typical Characteristics (cont.)
Figure 4. AC Efficiency @25OC
Figure 5. Power Factor
Figure 6. IOUT Temperature Regulation
Effic
ienc
y (%
)
VACIN, (V)
100
95
90
85
80
75
70
65
60
55
50180 190 200 210 220 230 240 250 260 270 280
VOUT = 24.4VVOUT = 18.4V
VACIN, (V)
Pow
er F
acto
r
1.0
0.9
0.8
0.7
0.6
0.5180 190 200 210 220 230 240 250 260 270
VOUT = 24.4VVOUT = 18.4V
350
340
330
320
310
300
290
280
270
260
25020 30 40 50 60 70 80
Ambient. temp., (OC)
I OU
T, (m
A)
lOUT @ VOUT = 24V, VIN = 170VlOUT @ VOUT = 24V, VIN = 330VlOUT @ VOUT = 18V, VIN = 170VlOUT @ VOUT = 18V, VIN = 330V103% * lOUT,NOM
97% * lOUT,NOM
7
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
Typical Waveforms
Figure 7. Output current (green trace, 100mA/div),drain voltage (yellow trace, 100V/div) and bus voltage (purple trace, 100V/div) @VLINE = 230VAC
Figure 8. Output current (green trace, 100mA/div), drain voltage (yellow trace, 100V/div) and bus voltage (purple trace, 100V/div) @VLINE = 230VAC
Figure 9. Output current (green trace, 100mA/div),and bus voltage (yellow trace, 100V/div) @VLINE = 230VAC
Figure 10. Drain voltage (yellow trace, 100V/div)@VIN = 375VDC and LED open
8
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
Typical Waveforms (cont.)
Figure 11. Output diode current (green trace, 1A/div), @VIN = 170VDC and short across LED
Figure 12. Output diode current (green trace, 1A/div), @VIN = 170VDC and short across LED
Figure 13. Line voltage and line current @VAC = 180V Figure 14. Line voltage and line current @VAC = 270V
9
HV9971DB1
Supertex inc. www.supertex.com
Doc.# DSDB-HV9971DB1A032913
# Quan Ref. Des. Description Package Manufacturer ManufacturerPart #
1 1 BR1 Rect bridge GP 600V 0.8A Mini-Dip Diodes inc. HD06-T
2 1 C1 0.1µF 400V radial capacitor Thru-hole Epcos B32529E6104J000
3 2 C2, C10 3.3µF 400V elect vy radial capacitor Thru-hole Nichicon UVZ2G3R3MPD
4 1 C3 0.5pF 50V ceramic chip capacitor SMT0603 Yageo CC0603CRNP09BNR50
5 1 C4 22µF 16V alum elect capacitor Thru-hole Panasonic ECG ECE-A1CKA220
6 1 C5 10pF 50V ceramic chip capacitor SMT0805 Yageo CC0805JRNP09BRN100
7 1 C6 20pF 630V ceramic chip capacitor SMT1206 Kemet C1206C200JBRACTU
8 1 C7 680 pF 250VAC capacitor Thru-hole Murata DE2B3KH681KA3B
9 1 C8 10µF 50V ceramic chip capacitor SMT1210 Taiyo Yuden UMK325C7106MM-T
10 2 C9, C10 47nF 500 ceramic chip capacitor SMT1206 Vishay VJ1206Y473KXEAT5Z
11 1 D1 Diode ultra fast switch 600V 1A SMA Diodes inc. US1J-13-F
12 1 D2 Diode switch 75V 400mW SOD123 Diodes inc. 1N4148W-7-F
13 1 D3 Diode fast rec 200V 1A SMA Diodes inc. ES1D-13-F
14 3 D4, D5, D6 Diode fast rec 1000V 1A SMA Micro Comm ES1M-TP
15 2 L1, L2 2.2mH 0.20A inductor SMT Murata 13R225C
16 1 M1 600V 2A N-channel MOSFET I-PAK Vishay IRFUC20PBF
17 1 RDD 374Ω 1% resistor 1/4WThru-hole Any ---
18 1 RIN 953kΩ 1% resistor SMT1206 Any ---
19 1 RD 95.3kΩ 1% resistor SMT1206 Any ---
20 1 RBIAS 13.3kΩ 1% resistor SMT0805 Any ---
21 1 RS-A 3.48Ω 1% resistor SMT1206 Any (3.48//15) = 2.825
22 1 RS-B 15.0Ω 1% resistor SMT1206 Any (3.48//15) = 2.825
23 1 RF1 10Ω 5% 2W MF fusible resistor 1/4WThru-hole Vishay ---
24 2 R1, R2 Not Installed SMT1206 Any ---
25 1 R3 10Ω 1% resistor SMT0805 Any ---
26 1 R4 1.91kΩ 1% resistor SMT0805 Any ---
27 1 R5 1.1kΩ 1% resistor 1/4WThru-hole Any ---
28 1 R6 0Ω JumperWire - ---
29 1 T1 Custom transformer Thru-hole Any ---
30 1 U1 LED Driver IC SOIC-8 Supertex HV9971LG-G
31 1 VR1 Diode Zener 180V 600W 5% SMA Vishay BZG03C180TR
Bill of Materials
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receivesan adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liabilityto the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry andspecifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)
©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888www.supertex.com10
HV9971DB1
Doc.# DSDB-HV9971DB1A032913
WD2 (1st Primary)70T - #34 AWG
1
2
3
FL1
FL2
9
8
10
4
5
WD4 (2nd Primary)37T - #34 AWG WD3 (Bias)
10TX2 - #30 AWG
WD5 (Secondary)12T - #25 AWG
WD1 (Secondary)11T - #25 AWG TIW
Flyback Transformer Specifications
Transformer Electrical Diagram
Transformer Electrical SpecificationsElectrical strength From pins 1-3 to pins 8-10 1second, AC 60Hz 3000VAC
Primary inductance Pins 1, 3 all other windings open, at 100kHz 916μH, ±10%
Resonant frequency Pins 1, 3 all other windings open 750KHz (min.)
Primary leakage inductance Pins 1, 3, leads 9, 10 shorted 18μH (max.)
Transformer Bill of MaterialsItem Description
1 Core: RENCO E16/8/5 (or equivalent), Al = 80nH/T^2
2 Bobbin: E/16/8/5 vertical, 10pin or equivalent
3 Triple insulated wire: #25 AWG
4 Magnet wire: #34 AWG
5 Magnet wire: #30 AWG
6 Tape: 3M 1298 Polyester Film, 8mm wide, 2.0mils thick or equivalent
7 Tape: 3M 1298 Polyester Film, 4.7mm wide, 2.0mils thick or equivalent
8 Varnish: Dolph BC-359 or equivalent
Transformer Build Diagram
WD5 (2nd Secondary)
12T - #25 AWG TIW
WD4 (2nd Primary)
37T - #34 AWG
WD3 (Bias)
10TX2 - #30 AWG
WD2 (1st Primary)
70T - #34 AWG
WD1 (Secondary)
11T - #25 AWG TIW
10
3
5
4
FL2 2
1
FL1 8
9