LT3485 데이터 시트보기 (PDF) - Linear Technology

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LT3485

Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive

Linear Technology 

LT3485-0/LT3485-1/

LT3485-2/LT3485-3

W

FU CTIO AL BLOCK DIAGRA

TO BATTERY

TO VIN

C1

C2

DONE

9

VMONT

10

3

2

Q3

CHIP

SAMPLE POWER

AND HOLD

Q2

CHARGE

1

TO VIN 8

QQ

SR

ONE-

SHOT

IGBT

DRIVER

POWER

IGBTIN

7

IGBT

DRIVER

20Ω

20k

ENABLE

R3

4k

R1

2.5k

A2

VOUT

COMPARATOR

1.25V

REFERENCE

ONE-

SHOT

6

TO GATE OF IGBT

LT3485-3: RSENSE = 0.010Ω

LT3485-0: RSENSE = 0.015Ω

LT3485-2: RSENSE = 0.022Ω

LT3485-1: RSENSE = 0.030Ω

R2

60k

R4

120k

DCM

COMPARATOR

ONE-

SHOT

A3

T1 D1

PRIMARY

SECONDARY

VOUT

SW

4, 5

+– 45mV

COUT

PHOTOFLASH

CAPACITOR

DRIVER

S

RQ

Q1

A1

RSENSE

GND

+–

11

20mV

3485 F01

Figure 1

8

34850123fb

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