LT1245 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT1245

High Speed Current Mode Pulse Width Modulators

Linear Technology 

TYPICAL APPLICATI S

External Clock Synchronization

EXTERNAL

SYNC

INPUT

0.01µF

+

VREF

8

RT

RT/CT

4

CT

5V REF

OSCILLATOR

47Ω

D1

D1 IS REQUIRED IF THE SYNC AMPLITUDE IS LARGE

ENOUGH TO PULL THE BOTTOM OF CT MORE THAN

300mV BELOW GROUND.

LT1241 • TA01

VREF

8

R COMP

1

C

FB

2

–

+

2.5V

ISENSE

3

LT1241 Series

Soft Start

5V REF

5.6V

1V

1mA

2R

–

R

+

+

1.5V

–

LT1241 • TA02

Adjustable Clamp Level with Soft Start

VREF

8

RT/CT

4

R2 100k COMP

1

FB

2

–

C R1

+

2.5V

( VCLAMP ≈

1.67

R2

R1

+1

5V REF

MAIN BIAS

OSCILLATOR

5.6V

1mA

2R

1V

–

R

+

REFERENCE ENABLE

REFERENCE PULL-DOWN

UV

LOCKOUT

OUTPUT

PULL-DOWN

T

S

R

18V

BLANKING

+

1.5V

–

VCC

7

OUTPUT

6

GND

5

ISENSE

3

VIN

RS

IPK (MAX) ≈

VCLAMP

RS

WHERE: 0V ≤ VCLAMP ≤ 1.0V

tSOFT START = – ln 1 –

VC

3 • VCLAMP

C

R1 R2

R1 + R2

LT1241 • TA03

11

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