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Analog Devices EVAL-LT8355-1-AZ, Руководство пользователя

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Analog Devices EVAL-LT8355-1-AZ Скачать руководство пользователя страница 6

6

DEMO MANUAL EVAL-LT8355-1-AZ

Rev. 0

TEST RESULTS

Figure 4. EVAL-LT8355-1-AZ, Efficiency vs Input Voltage: 

Channel 1, 72V

LED

 450mA, Channel 2, 30V

LED

 1A

Figure 5. EVAL-LT8355-1-AZ, Internal 250Hz 10% PWM Dimming with 

EMI Filters: 12V

IN

, Channel 1, 72V

LED

 450mA, Channel 2, 30V

LED

 1A

Figure 6. EVAL-LT8355-1-AZ, External 150Hz PWM Dimming with EMI 

Filters: 12V

IN

, Channel 1, 72V

LED

 450mA, Channel 2, 30V

LED

 1A

f

SW

 = 250kHz

100% TO 125% SSFM

BOTH CHANNELS ON

WITH FILTERS

WITHOUT FILTERS

INPUT VOLTAGE (V)

8

10

12

14

16

18

60

65

70

75

80

85

90

95

100

EFFICIENCY (%)

eval-lt8355-1-az F04

2ms/DIV

V

SW1

50V/DIV

V

SW2

50V/DIV

I

LED1

1A/DIV

I

LED2

1A/DIV

eval-lt8355-1-az F05

I

LED1

 5k:1 

I

LED1

 2k:1

I

LED1

 1k:1

I

LED1

 500:1

I

LED2

 5k:1

I

LED2

 2k:1

I

LED2

 1k:1

I

LED2

 500:1

2µs/DIV

I

LED1

500mA/DIV

I

LED2

1A/DIV

eval-lt8355-1-az F06

Содержание EVAL-LT8355-1-AZ

Страница 1: ...lters combined with proper board layout and SSFM are very effective in reducing EMI to comply with CISPR25 class 5 limits Please follow the recommended layout and the four layer PCB thickness of EVAL...

Страница 2: ...n LED to LED CH1 R14 0 R11 1M R10 15k CH2 R52 287k R53 10k R47 10k 81 36 V V Peak Efficiency SSFM ON PVIN 12V CH1 VLED 72V ILED 450mA CH2 VLED 30V ILED 1A with Filters without Filters 90 91 Peak Switc...

Страница 3: ...tage is between 8V and 18V for proper operation at max LED current 4 Observe the LED strings running at the programmed LED current 5 To change the brightness with analog dimming the CTRL1 pin is used...

Страница 4: ...eval lt8355 1 az F02 Figure 2 Setup Drawing for EVAL LT8355 1 AZ Channel 1 as Boost LED Driver and Channel 2 as Buck Boost Mode LED Driver See Boost LED Driver Setup Section for More Information on B...

Страница 5: ...T VREF VIN FB FB R1 R2 40k 10k 10k 10k R1 Q a Boost a Buck Boost Figure 3 Proper Star Up Configuration Boost Calculate R1 and R2 to set desired VOUT_OVP volt age and VFB to 400mV at VIN_MIN VIN_MIN 40...

Страница 6: ...AZ External 150Hz PWM Dimming with EMI Filters 12VIN Channel 1 72VLED 450mA Channel 2 30VLED 1A fSW 250kHz 100 TO 125 SSFM BOTH CHANNELS ON WITH FILTERS WITHOUT FILTERS INPUT VOLTAGE V 8 10 12 14 16...

Страница 7: ...oad Step Transient Response 12VIN fSW 250kHz 100 TO 125 SSFM 200 s DIV VCTRL1 2 5V DIV ILED1 500mA DIV ILED2 500mA DIV eval lt8355 1 az F07 eval lt8355 1 az F08 Figure 8 EVAL LT8355 1 AZ Thermal Image...

Страница 8: ...LT8355 1 AZ WITH SHIELD AMBIENT FREQUENCY MHz 0 1 1 10 108 20 10 0 10 20 30 40 50 60 70 80 AVERAGE CE dB V eval lt8355 1 az F09b CLASS 5 PEAK LIMIT EVAL LT8355 1 AZ EVAL LT8355 1 AZ WITH SHIELD AMBIE...

Страница 9: ...rt number for an example shield can be found in the Parts List section in the Optional EMI EMISSIONS SHIELD OPTION Figure 12 EVAL LT8355 1 AZ Top Silkscreen Outlining Placement of Shield Clips and EMI...

Страница 10: ...SQJA72EP T1_GE3 15 2 M4 M10 XSTR MOSFET P CH 100V 33 6A POWERPAK SO 8L AEC Q101 VISHAY SQJ211ELP T1_GE3 16 1 Q2 XSTR PNP 100V 1A SOT 23 3 AEC Q101 DIODES INC FMMT593QTA 17 3 R1 R35 R36 RES 100k 1 1 1...

Страница 11: ...Q200 VISHAY CRCW060310R0JNEA 46 0 CL1 CL6 OPTION WE SHC CABINET CLIP 6 5mm 0 8mm 1 27mm WURTH 369 000 00 47 0 SH1 OPTION WE SHC SHIELDIY 61 5mm 61 5mm WURTH 360002 Optional Electrical Components 48 0...

Страница 12: ...k 1 0603 FB2 OPT C20 OPT L1 8 2uH XAL6060 822MEC 1 2 R6 OPT C17 OPT 0402 TP8 EN UVLO FB3 OPT C1 OPT 0402 R1 100K 1 R21 OPT M4 SQJ211ELP 5 2 4 1 3 C18 OPT 0402 C22 4 7uF 25V 1210 R10 15k 1 R22 OPT C12...

Страница 13: ...22 ISN2 20 ISP2 19 GND 29 PWM2 11 PWMTG2 21 RT 12 SENSEN2 25 SENSEP2 24 FAULT2 13 VC2 17 VREF 14 C42 2 2uF M10 SQJ211ELP 1 2 5 3 4 C36 4 7uF 1210 100V R45 OPT FB9 FBMH2012HM331 T TP18 TP17 VC2 R37 OPT...

Страница 14: ...ot disclose or transfer any portion of the Evaluation Board to any other party for any reason Upon discontinuation of use of the Evaluation Board or termination of this Agreement Customer agrees to pr...

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