LTC4211IMS8TRPBF 查看數據表（PDF） - Linear Technology

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LTC4211IMS8TRPBF

Hot Swap Controller with Multifunction Current Control

Linear Technology 

LTC4211

APPLICATIONS INFORMATION

OVERVOLTAGE

IF ANY FAULT HAPPENS

AFTER THIS POINT, THE

CIRCUIT BREAKER TRIPS

AND FAULT LATCHES LOW

IF OVERVOLTAGE GOES

AWAY, SECOND CYCLE

CONTINUES

12

2A

34

5

6

VCC

ON

SLOW COMPARATOR ARMED

OVERVOLTAGE CIRCUIT BREAKER

TRIPS, GATE PULLS DOWN AND

FAULT LATCHES LOW

78

ABC

TIMER

GATE

VOUT

RESET

FILTER

>VREF – 80mV

GATE

VOUT

POWER GOOD

VFB > VREF

FPD

POWER BAD

VFB < VREF

>VREF

FAULT

FAULT IS PULLED LOW (BUT NOT LATCHED)

DUE TO A START-UP OVERVOLTAGE PROBLEM

Figure 24. High Side Overvoltage Protection

4211 F24

FAULT

LATCHED LOW

Low Side (Output) Overvoltage Protection

A Zener diode can be used in a similar fashion to detect/

protect the system against a supply overvoltage condition

on the load (or low) side of the pass transistor. In this

case, the Zener diode is connected from the load to the

LTC4211’s FILTER pin, as shown in Figure 25. An additional

diode, D1, prevents the FILTER pin from pulling low during

an output short-circuit. Figure 26 illustrates the timing

diagram for a low side output overvoltage condition. In

this example, VCC starts up in an overvoltage condition

but the LTC4211 can only sense the overvoltage supply

condition at Time Point 6 when the GATE pin has ramped

up. At Time Point 6, VFILTER is greater than 1.236V, the

circuit breaker is tripped, the GATE pin voltage is pulled

to ground and FAULT is asserted low and latched.

4211fb

32

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