Buck Solution_18W LED Driver for Bulb LD7835_DB-00

1

Leadtrend Technology Corporation

LD7835_DB-00.a, October 2013

1. LED Driver Module Specification

1.1. Input Condition

AC Input Voltage : 180VAC ~ 264VAC

AC Input Frequency : 47Hz ~ 63Hz

1.2. Output Condition

Output Voltage : 140V (44 pcs LED)

Output Current : Typical 125mA

1.3. Protection Condition

LED Open Protection Auto-recovery, Hiccup 1 times

LED short Protection Auto-recovery, Hiccup 1 times

Over Current Protection Cycle-by-cycle limit

Over Temp. Protection Auto-recovery, Hiccup 1 time

1.4. Ambient Temperature

Ambient Temperature 25oC

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

2

Leadtrend Technology Corporation

LD7835_DB-00.a, October 2013

2. LED Driver Application Circuit

2.1. Schematic

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

3

Leadtrend Technology Corporation

LD7835_DB-00.a, October 2013

2.2. BOM List

P/N Component Value Note

R1 1MΩ, 1206, ±5% YAGEO

R2 1MΩ, 1206, ±5% YAGEO

R3 Zener 6.2V

R4 210KΩ,0805, 1% YAGEO

R6 36KΩ,0805, ±1% YAGEO

R8 200Ω, 0805, 5% YAGEO

R9 47KΩ,0805, 1% YAGEO

R10 3.3Ω,1206, 1% YAGEO

R11 3.6Ω,1206, 1% YAGEO

R12 100KΩ,0805, ±5% YAGEO

L1 T6*8 2.8mH

L3 1mH, EE10 LD design

D3 IN4148

P/N Component Value Note

C1 0.1uF, 400V, NA

C2 0.1uF, 400V, NA

C3 2.2uF, 10V, 0805 YAGEO

C4 10uF,50V,

C5 0.1uF,50V, 0805 YAGEO

C6 22pF,500V, 0805

CE1 15uF, 160V, E-cap

D1 ER1G

D2 A7

BD1 TB6S

V1 NC

F1 10Ω

Q1 4A/600V I

IC1 LD7835 Leadtrend

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

4

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

2.3. PCB Gerber File

TOP VIEW

BOTTOM VIEW

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

5

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3. Executive Summary Test Equipment

Equipment Equipment Model No.

Electrical Load Chroma 63030

Power Meter WT210

AC power source Chroma 61602

Scope TDS3014

Multi-function Meter Fluke 187

Thermal Hunter PT-3S

3.1. Input Characteristics

3.1.1. Efficiency

Specification Judgment

>0.9 PASS

Eff.(%) Pin

(W) Io

(mA) Vo

(V) Efficiency

(%)

180Vac/50Hz 19.19 127 139.45 92.28 230Vac/50Hz 19.08 127 139.89 93.11 264Vac/50Hz 19.17 127 139.93 92.70

Table 1 Efficiency @ CV Load = 140V

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

6

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.1.2. Power Factor

Specification Judgment

>0.9 PASS

Vo

Vac CV:130V CV:135V CV140V LED:140V

180Vac/50Hz 0.943 0.938 0.932 230Vac/50Hz 0.959 0.956 0.954 264Vac/50Hz 0.958 0.957 0.956

Table 2 Power Factor

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

7

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.2. Output Characteristics

3.2.1 Current Accuracy

Specification Judgment

<5% PASS

Vac

Vo

180V

/50Hz

230V

/50Hz

264V

/50Hz

Line Regulation

CV=140V 127 127 127 0

CV=135V 127 127 127 0

CV=130V 127 127 127 0

Load Regulation 0 0 0 0

Table 3 Output Current (mA)

LED ACC% = (Max-Min)/ (Max+Min)

= 0

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

8

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.3. Turn On Delay Time

Input Turn on delay Specification Judgment

180Vac 792ms NA NA

Table 4 Turn On Delay Time

Fig. 1 Start-up Waveforms @ 180Vac/50Hz

CH2:Vac, CH3:vo

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

9

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.4. Abnormal Test 3.4.1. LED Open Voltage Test

Specification Judgment

<160V PASS

Input Voltage 90VAC/60Hz 264VAC/60Hz

Output Voltage 159V 158V

Table 5. Over Voltage Level

Fig. 2 LED Open Test @ 180Vac/50Hz Fig. 3 LED Open Test @264Vac/60Hz

CH3:Vout CH3:Vout

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

10

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.4.2. LED Short Dissipation Test

Specification Judgment

<0.5W PASS

Input Voltage 180VAC/50Hz 230VAC/50Hz 264VAC/50Hz

Input Power 73mW 128mW 152mW

Table 6 Input Power during LED short

LED Short Test @ 180Vac/50Hz LED Short Test @ 264Vac/50Hz

CH1: IL, ,CH3:Gate CH1: IL, ,CH3:Gate

3.5. Power Component Stress Voltage

Specification Judgment

< Derating PASS

Table 7 MOS and Diode Stress Voltage (180V/ 50Hz)

Table 8 MOS and Diode Stress Voltage (264V/ 60Hz)

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

11

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.6. MOSFET Voltage and Inductor Current Waveforms

Drain & IL waveforms @ 180Vac/50Hz Drain & IL waveforms @ 180Vac/50Hz/Zoom-In

CH1: Drain, CH3: IL CH1: Drain, CH3: IL

Drain & IL waveforms @ 230Vac/50Hz Drain & IL waveforms @ 230Vac/50Hz/Zoom-In

CH1: Drain, CH3: IL CH1: Drain, CH3: IL

Drain & IL waveforms @ 264Vac/50Hz Drain & IL waveforms @ 264Vac/50Hz/Zoom-In

CH1: Drain, CH3: IL CH1: Drain, CH3: IL

Buck Solution_18W LED Driver for Bulb LD7835_DB-00

12

Leadtrend Technology Corporation

LD7835_DB-00.a, September 2013

3.7. Surge Test

Specification Judgment

Meet IEC 6100-4-5 PASS

EUT Line: 220Vac ■ 2PIN □ 3PIN System Spec.: 24V/ 0.7A

Waveform ■ 1.2/50 □ 10/700 □ Ring

Impedance

□ 12ohm

Repetition

Once each 20 second period with 5 transients

per test ■ 2ohm

NOTE: LD7835 Real Demo Board

Test Mode Phase & Level (V) Test Result

L/N 90 ﾟ ■+0.5K ■-0.5K 270 ﾟ ■+0.5K ■-0.5K PASS PASS

NOTE:

Table 9 Surge Test