Linear DC1772A Demo Manual Download Page 5 | Manualshive

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Linear DC1772A Demo Manual Download Page 5

5

dc1772af

DEMO MANUAL DC1772A

Figure 4. DC1772A CTRL LED Current Foldback at Low PVIN with UVLO Falling and Rising

Quick start proceDure

0.0

0.2

0.4

0.6

0.8

1.0

1.2

7.5

8

8.5

9

9.5

10

10.5

11

11.5

12

PVIN (V)

IL

E

D

(

A)

under

voltage

lockout

(falling)

turn-on

(rising)

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Summary of Contents for DC1772A

Page 1: ...h other LED drivers The LT 3761 generates its own PWMOUT dimming waveform at a frequency determined L LT LTC LTM Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation All other trademarks are the property of their respective owners by the capacitance on the PWM pin C8 gives 300Hz for DC1772A The PWMOUT duty cycle is determined by the voltage on the DIM te...

Page 2: ...rammed LED current and brightness related to the programmed PWMOUT duty cycle 8 To change the brightness with PWM dimming simply vary the VDIM voltage between 0V and 7 7V with the PWM terminal floating 9 To change the brightness with analog dimming simply attachavoltagesourceontheCTRLterminalandreduce the voltage below 1 2V 10 Observe the reduction of brightness in the LED string when PWM or analo...

Page 3: ...3 dc1772af DEMO MANUAL DC1772A Quick Start Procedure Figure 1 Test Procedure Setup Drawing for DC1772A ...

Page 4: ...2A 300Hz PWM Dimming Waveforms at Different PWMOUT Duty Cycles 80 82 84 86 88 90 92 94 96 98 100 0V 5V 10V 15V 20V 25V 30V 35V 40V 45V 50V 55V 60V PVIN INPUT VOLTAGE V EFFICIENCY 60VLED 1 0A PWM INTVCC Quick Start Procedure ILED 1A DIV 0 5ms DIV VDIM 7 7V DCPWM 96 VDIM 4V DCPWM 50 VDIM 1 5V DCPWM 10 VDIM 0 4V DCPWM 4 3 ...

Page 5: ...2A Figure 4 DC1772A CTRL LED Current Foldback at Low PVIN with UVLO Falling and Rising Quick Start Procedure 0 0 0 2 0 4 0 6 0 8 1 0 1 2 7 5 8 8 5 9 9 5 10 10 5 11 11 5 12 PVIN V ILED A under voltage lockout falling turn on rising ...

Page 6: ...R2 Res Chip 90 9k 0 06W 1 0402 Vishay CRCW040290K9FKED 16 1 R3 Res Chip 1M 0 1W 1 0603 Vishay CRCW06031M00FKED 17 1 R4 Res Chip 18 2k 0 06W 1 0402 Vishay CRCW040218K2FKED 18 1 R5 Res Chip 10k 0 06W 5 0402 Vishay CRCW040210K0JKED 19 1 R6 Res Chip 29 4k 0 06W 1 0402 Vishay CRCW040229K4FKED 20 1 R7 Res Chip 1M 0 06W 5 0402 Vishay CRCW04021M00JKED 21 1 R8 Res Chip 140k 0 06W 1 0402 Vishay CRCW0402140K...

Page 7: ...7 OPT R17 OPT R2 90 9k R2 90 9k R22 OPT R22 OPT D1 PDS5100H D1 PDS5100H R1 499k 1 R1 499k 1 LED 60VLED LED 60VLED R4 18 2k 1 R4 18 2k 1 PGND PGND R21 OPT R21 OPT M2 Si2328DS M2 Si2328DS C4 1uF 100V 1206 C4 1uF 100V 1206 GND GND M3 OPT M3 OPT U1 LT3761EMSE U1 LT3761EMSE EN UVLO 12 PWM 8 INTVCC 13 VC 5 DIM SS 10 VREF 7 CTRL 6 RT 11 VIN 14 ISP 4 ISN 3 PWMOUT 1 GATE 16 FB 2 SENSE 15 GND 17 OPENLED 9 C...

Page 8: ...UDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES The user assumes all responsibility and liability for proper and safe handling of the goods Further the user releases LTC from all claims arising from the handling or use of the goo...

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