LTC4210-2CS6#TRM【PDF 12/20 页】IC CONTROLLER HOT SWAP TSOT23-6

12

LTC4210-1/LTC4210-2

421012f

The current through R

SENSE

can be divided into two

components; I

CLOAD

due to the total load capacitance

(C

LOAD

) and I

LOAD

due to the noncapacitive load elements.

The capacitive load typically dominates.

For a successful start-up without current limit, I

RSENSE

<

I

LIMIT

:

I

RSENSE

= I

CLOAD

+ I

LOAD

< I

LIMIT

I

C

V

T

I

RSENSE

LOAD

OUT

LOAD LIMIT

=

?/DIV>

+

<

"

(7)

Due to the voltage follower configuration, the V

OUT

ramp

rate approximately tracks V

GATE

:

=

H

=

V

T

I

C

V

T

I

C

OUT CLOAD

LOAD

GATE

(8)

At time point 6, V

OUT

is approximately V

IN

but GATE ramp-

up continues until it reaches a maximum voltage. This

maximum voltage is determined either by the charge

pump or the internal clamp.

Start-Up Cycle With Current Limit

If the duration of the current limit is brief during start-up

(Figure 4) and it did not last beyond the circuit breaker

function time out, the GATE behaves the same as in start-

up without current limit except for the time interval be-

tween time point 5A and time point 5B. The servo amplifier

limits I

RSENSE

by decreasing the I

GATE

current (<10礎).

I

mV

R

RSENSE LIMIT

SENSE

=

50

(9)

Equations 8 and 9 are applicable but with a lower GATE and

V

OUT

ramp rate.

Gate Start-Up Time

The start-up time without current limit is given by:

t

C

V

I

t

C

V

I

C

V

I

STARTUP

GATE

TH IN

GATE

STARTUP

GATE

TH

GATE

IN

GATE

=

+

=

+

"

(10)

During current limiting, the second term in Equation 10 is

partly modified from C

GATE

" V

IN

/I

GATE

to C

LOAD

"

V

IN

/I

CLOAD

. The start-up time is now given by:

C

V

I

C

V

I

C

V

I

C

V

I

STARTUP

GATE

TH

GATE

LOAD

IN

CLOAD

GATE

TH

LOAD

IN

=

+

=

+

"

For successful completion of current limit start-up cycle

there must be a net current to charge C

LOAD

and the

current limit duration must be less than t

CBDELAY

. The

second term in equation 11 has to fulfill equation 12.

C

V

I

t

LOAD

IN

RSENSE LOAD

CBDELAY

"

<

(12)

APPLICATIO S I FOR ATIO

U

V

TIMER

V

GATE

V

OUT

I

RSENSE

V

ON

V

IN

>2.5V

1 2

3 4 5

5A 5B 6

7

RESET

MODE

INITIAL

CYCLE

START-UP

CYCLE

NORMAL

CYCLE

5礎

100礎

COMP1

10礎

60礎

100礎

DISCHARGE

BY LOAD

REGULATED AT 50mV/R

SENSE

V

TH

COMP2

2礎

<10礎

4210 F04

>1.3V

Figure 4. Operating Sequence with

Current Limiting at Start-Up Cycle

(11)

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