LT3956 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT3956

80VIN, 80V OUT Constant-Current, Constant-Voltage Converter

Linear Technology 

LT3956

Typical Applications

94% Efficient 25W White LED Headlamp Driver

VIN

6V TO 60V

(80V TRANSIENT)

CVIN

R1

2.2µF 332k

s2

R2

100k

INTVCC

100k

CSS

47nF

L1

22µH

D1

VIN

EN/UVLO

SW

PGND

COUT

2.2µF

s5

VREF

ISP

332k

LT3956

CTRL

RS

0.68Ω

40.2k

ISN

R3

1M

VMODE

PWM

SS

FB

R4

16.2k

RT

PWMOUT

RT

VC

GND INTVCC

28.7k

375kHz

RC

20k

INTVCC

CC

4.7nF

CVCC

4.7µF

SEE SUGGESTED LAYOUT (FIGURE 5)

M1: VISHAY SILICONIX Si2328DS

D1: DIODES INC PDS5100

L1: COILTRONICS DR125-220

C1, C2: MURATA GRM42-2x7R225

370mA

25W LED STRING

(CURRENT DERATED

FOR VIN < 11V)

M1

3956 TA02a

PWM Waveforms for 25W Headlamp Driver

PWM

ILED

200mA/DIV

ILI

1A/DIV

VOUT = 68V

VIN = 15V

5µs/DIV

3956 TA02b

3956f

16

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