LTC4212CMS datasheet(18/24 Pages) LINER

tên linh kiện	LTC4212CMS

Giải thích chi tiết về linh kiện	Hot Swap Controller with Power-Up Timeout

PDF	24 Pages

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nhà sản xuất	LINER [Linear Technology]

Trang chủ	http://www.linear.com

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18 / 24 page

LTC4212

4212f

OPERATIO

Figure 4. Power-Up with Overcurrent, Slow Comparator Trips the Circuit Breaker

VCC

VREF

2.34V

VREF

TIMER

GATE

DC/DC

CONVERTER

OUTPUT

VCC – VSENSE

FAULT

PGT

PGI

PGF

4212 F04

10 11

1415

POWER GOOD TIMER

ENABLED (CPGT)

0.95V

0.65V

2ND TIMING

CYCLE (CTIMER)

1ST TIMING

CYCLE (CTIMER)

1ST TIMING

CYCLE (CTIMER)

SOFT-START

ACTIVE

VREF

VCC – VSENSE = 50mV

> 50mV, >18

µs

It consists of the time the FAULT pin takes to discharge

CAUTO (Time Points 9 to 10), the 120µs needed to reset the

circuit breaker (Time Points 9 to 11), the time it takes the

pull-up resistor at the ON pin to charge CAUTO above

1.316V (Time Points 11 to 12) and the elapsed time before

the external N-channel starts to conduct during the second

timing cycle (Time Points 12 to 16).

Sense Resistor Considerations

The fault current level at which the LTC4212’s internal

electronic circuit breaker trips is determined by a sense

resistor connected between the LTC4212’s VCC and SENSE

pins and two separate trip points. The first trip point is set

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