Product Name : LD5805. Subject : (EVB) Function test report. To : Customer Issue Date : 2014/07/17

Transcription

1 Product Name : LD5805 Subject : (EVB) Function test report To : Customer Issue Date : 2014/07/17 Prepare By : P.F Approve : Will 1

2 Table of Content 1. Test Equipment Function Test LED Current Matching and Ripple Current Performance Efficiency & Component Thermal LED current setting accuracy & matching Dimming Performance Operating Frequency Setting Performance Steady state Start up state Open LED Strings Protection Short 3pcs LED Protection Over Temperature Protection Test Reference Schematic Bill of Material (Default Analog Dimming Mode) Abnormal Test LD5805 Abnormal test 單 Pin 對地開機後短路 : LD5805 Abnormal test 單 Pin 對地短路後開機 : LD5805 Abnormal test 相鄰兩 Pin 短路後開機 : LD5805 Abnormal test 相鄰兩 Pin 開機後短路 : LD5805 Abnormal test 單 Pin 開路後開機 :

3 1. Test Equipment Equipment DC Power Supply Storage Scope Equipment Model. GW GPC-3060D Tektronix DPO4034 Current Meter FLUKE 187 Voltage Meter FLUKE 187 Current Probe Tektronix TCP0030 3

4 2. Function Test 2-1 LED Current Matching and Ripple Current Performance Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz DIM Duty=100%, C OUT =100uF. LD5805 LED1 LED2 LED3 LED4 LED Current(mA) LED Ripple Current(mA) LEDX Pin Voltage(V) LED1 LED2 CH1:VLED1, CH2:VOUT, CH3:VIN, CH4: ILED CH1:VLED2, CH2:VOUT, CH3:VIN, CH4: ILED LED3 LED4 CH1:VLED3, CH2:VOUT, CH3:VIN, CH4: ILED CH1:VLED4, CH2:VOUT, CH3:VIN, CH4: ILED 4

5 2-2 Efficiency & Component Thermal Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, DIM Duty=100%, C OUT =100uF, Ta=25 C. Efficiency: LD5805 V IN (V) I IN (A) V OUT (V) I OUT (A) Efficiency 4-channel % Burn in 30 minute component thermal: te: IC L-Inductor Diode MOSFET Ambient Unit 4-channel

6 2-3 LED current setting accuracy & matching PWM-Dimming I LED 1200 [ ma] R [ K ] ISET LD5805 Current Offset Offset ISET RISET LED1 LED2 LED3 LED4 matching (max) (min) (ma) (KΩ) (ma) (ma) (ma) (ma) (%) (%) (%) Analog-Dimming I LED 1200 [ ma] R [ K ] ISET LD5805 Current Offset Offset ISET RISET LED1 LED2 LED3 LED4 matching (max) (min) (ma) (KΩ) (ma) (ma) (ma) (ma) (%) (%) (%)

7 2-4 Dimming Performance Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, Ta=25 C, F SW ~ 200KHz, C OUT =100uF, ADIM=20KHz, R ISET =10K LD5805 ADIM ISET LED1 LED2 LED3 LED4 Offset Offset matching (%) (ma) (ma) (ma) (ma) (ma) Max Min (%)

8 2-5 Operating Frequency Setting Performance Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, Ta=25 C, F SW ~ 200KHz, C OUT =100uF Fop[ KHz] R [ K ] RT LD5805 RT(KΩ) Fop(SET) Fop Offset (KHz) (KHz) (%)

9 2-6 Steady state Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, C OUT =100uF. PWM Frequency & Duty & LED current DRV Vout ripple DRV Ipeak Ipeak CH1:VCMP, CH2:VOUT, CH3: VGATE, CH4: ILED CH1:VCMP, CH2:VOUT_ac, CH3: VGATE, CH4: ILED 9

10 2-7 Start up state Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, C OUT =100uF. Start up by VIN Start up by ENA CH1:VOUT, CH2:VCMP, CH3:VGATE, CH4: ILED CH1:VOUT, CH2:VCMP, CH3:VGATE, CH4: ILED 10

11 2-8 Open LED Strings Protection Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, C OUT =100uF. Turn on then one string open Turn on then All string open CH1:VOUT, CH2:VGATE, CH3: VOVP, CH4: ILED CH1:VOUT, CH2:VGATE, CH3: VOVP, CH4: ILED 4 strings by step open CH1:VOUT, CH2:VGATE, CH3: VOVP, CH4: ILED 11

12 2-9 Short 3pcs LED Protection Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, C OUT =100uF. 3LED short on LED1 string (Total LED current) 3LED short on LED1&2 string (Total LED current) CH1:VOUT, CH2:VLED1, CH3: VGATE, CH4: ILED CH1:VOUT, CH2:VLED1, CH3: VGATE, CH4: ILED 3LED short on LED1 &2&3 string (Total LED current) CH1:VOUT, CH2:VLED1, CH3: VGATE, CH4: ILED 12

13 2-10 Over Temperature Protection Test Condition: V IN =19V, V OUT ~ 58V, 4 channels, I_ LED =120mA/CH, L=33uH, F SW ~ 200KHz, C OUT =100uF. CH1:VOUT, CH2:VCOMP, CH3: VGATE, CH4: ILED 13

14 3. Test Reference Schematic 14

15 3-1 Bill of Material (Default Analog Dimming Mode) Value Package Components Quantity Vendor Resistor 0R ±5% 0603 RL1, RL2, RL3, RL4, RX 5 0R ±5% 0805 C12, R2, R14, W R ±1% 1206 R7 1 1k ±5% 0805 R R ±5% 0805 R R ±5% 0805 R K ±5% 0805 R4, R18, R19, R K ±1% 0805 R K ±1% 0805 R K ±5% 0805 R13, R K ±1% 0805 R6 1 Capacitor 100pF/25V 0805 C10 1 1uF 0805 C5, C6 2 1uF/25V 0805 C uF/25V 1206 C1, C2, C3 3 47uF/50V CC10 (E.C) CC uF/100V CC20 (E.C) CC2 1 IC'S 100V10A TO-252 Q V/3A D1206 D1 1 LD5805 SOP16 U1 1 Others 33uH L-IHLP-5050CE-08 L1 1 NC Header1X4 P1 1 NC CC20 (E.C) CC3 1 NC 0805 C4, C8, C9, C18, C19, C21, R15, R26, R27, R28 10 NC 0603 RL5 1 NC 1206 R8, R9, R10 3 NC D1206 D3 1 NC SOD-123 D2 1 15

16 4. Abnormal Test LD5805 Abnormal test 單 Pin 對地開機後短路 : Test Condition:V IN =24V, V OUT =54V(LED=17pcs), LED Load Current=120mA/string, L=33uH, F SW =200KHz, C IN =47uF, C OUT =100uF, LPF=10V, PWM Voltage =2.5V, PWM Duty=100%, at 25 C. Test result Pin IC Result Phenomenon component list Judgment ( smoking/ fire/ input power) /Fail Module shut down (Latch) Module shut down (Latch) Module shut down (Auto-recovery) Module shut down (Latch) Module shut down (Auto-recovery) Module normal work Module shut down (Auto-recovery) Module shut down, IC Temp 140 C (Auto-recovery) Fuse open(fuse spec : 4A) Module normal work Module shut down (Auto-recovery) Module shut down (Auto-recovery) Module shut down (Latch) Module shut down (Latch) Module shut down (Latch) 16

17 LD5805 Abnormal test 單 Pin 對地短路後開機 : Test Condition:V IN =24V, V OUT =54V(LED=17pcs), LED Load Current=120mA/string, L=33uH, F SW =200KHz, C IN =47uF, C OUT =100uF, LPF=10V, PWM Voltage =2.5V, PWM Duty=100%, at 25 C. Pin IC Result Phenomenon Test result component list Vcomp Saturation(4V), Module shut down Judgment ( smoking/ fire/ input power) /Fail Module shut down Module shut down Module shut down Module shut down Module normal work Module shut down, IC Temp=55 C Module shut down, IC Temp 140 C Fuse open(fuse spec : 4A) VLPF < 1.5V 進 ADIM Mode 開機, LED Current= (ISET*0.04), Module abnormal work Module shut down, IC Temp=40 C Module shut down, IC Temp=40 C Vcomp Saturation(4V), Module shut down Vcomp Saturation(4V), Module shut down Vcomp Saturation(4V), Module shut down 17

18 LD5805 Abnormal test 相鄰兩 Pin 短路後開機 : Test Condition:VI N =24V, V OUT =54V(LED=17pcs), LED Load Current=120mA/string, L=33uH, F SW =200KHz, C IN =47uF, C OUT =100uF, LPF=10V, PWM Voltage =2.5V, PWM Duty=100%, at 25 C. Test result Pin IC Result Phenomenon component list Judgment ( smoking/ fire/ input power) /Fail 1--2 Module shut down, VLEDx >6.5V 進短路保護 2--3 Module shut down, OVP Pin <0.1V 進 SCP 保護 3--4 Module shut down, Vcomp Saturation 4--5 Module shut down, Vcomp Saturation 5--6 Module shut down, EN=0V Module shut down, 6--7 with R12 : Module no input power without R12 : Module input power=20ma 7--8 Fuse open, Module shut down MOSFET >180 C MOSFET Module normal work, LPF Pin BD Voltage > 24V Module abnormal work, LED Light-bar flicker LED 電流提高進 OTP 保護 Module normal work Module shut down Module normal work Module abnormal work, VIN=24V 進 OVP1 保護 VIN=12V 進 Vcomp Saturation Module abnormal work, VIN=24V 進 OVP1 保護 VIN=12V 進 Vcomp Saturation 18

19 LD5805 Abnormal test 相鄰兩 Pin 開機後短路 : Test Condition:V IN =24V, V OUT =54V(LED=17pcs), LED Load Current=120mA/string, L=33uH, F SW =200KHz, C IN =47uF, C OUT =100uF, LPF=10V, PWM Voltage =2.5V, PWM Duty=100%, at 25 C. Test result Pin IC Result Phenomenon component list Judgment ( smoking/ fire/ input power) /Fail 1--2 Module shut down 2--3 Module abnormal work 3--4 Module shut down 4--5 Module shut down 5--6 Module shut down 6--7 Module shut down 7--8 Fuse open, Module shut down MOSFET >180 C MOSFET Module normal work Module abnormal work Module abnormal work Module shut down Module normal work Module shut down Module shut down 19

20 LD5805 Abnormal test 單 Pin 開路後開機 : Test Condition:V IN =24V, VOUT=54V(LED=17pcs), LED Load Current=120mA/string, L=33uH, F SW =200KHz, C IN =47uF, C OUT =100uF, LPF=10V, PWM Voltage =2.5V, PWM Duty=100%, at 25 C. Judgment Pin IC Result Phenomenon /Fail Test result ( smoking/ fire/ component list input power) 1 Module normal work, LDE-4 channel open 2 Module shut down 3 Module shut down 4 Module shut down 5 Module shut down 6 Module shut down 7 Module shut down 8 Module shut down 9 Module shut down 10 Module abnormal in ADIM Mode 11 Module abnormal work, VGATE 週期不穩且有大小波形 12 Module shut down 13 Module normal work, LDE-1 channel open 14 Module normal work, LDE-2 channel open 15 Module shut down 20

21 16 Module normal work, LDE-3 channel open System Module open / short test: Summary: Light bar short :. Light bar open :. Boost choke short :. Boost diode short :. Boost main MOSFET, Vgs short : Module shut down (Auto recovery). Boost main MOSFET, Vgd short : Fuse open(fuse spec : 4A). 21