TPS2392

TPS2393

SLUS536C − AUGUST 2002 − REVISED AUGUST 2004

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15

DETAILED DESCRIPTION

+

+

H=CLOSED

+

L=CLOSED

SQ

Q

R

+

+

+

LCA

+

H=CLOSED

+

SQ

Q

R

12

13

1.35V

5V

FLT

EN_A

VLIM

4

9

10

6

8

1.4V

5

14

1

3

2

7

100 mV

VLIM

EN_A

11

IRAMP

RAMP

GENERATOR

FAULT

TIMER

OVERLOAD

OVERCURRENT

DRAINSNS

FLTTIME

ISENS

GATE

INSA

UVLO

OVLO

EN

−VIN

INSB

S

R

FT

ON

EN

OC

OL

RTN

+

OLC

FLT

UDG−02116

PG

FAULT

10

µA

10

µA

10

µA

10

µA

10

µA

10

µA

Figure 24. Block Diagram of PW Package

Under normal load and input supply conditions, this controlled current charges the module’s input bulk capacitance

up to the input dc voltage level. At this point, the load demand drops off, and the voltage at ISENS decreases. The

LCA now drives the GATE output to its supply rail. The 14-V typical output level ensures sufficient overdrive to fully