TK73246MCL Просмотр технического описания (PDF) - Toko America Inc

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производитель

TK73246MCL

LOW DROPOUT REGULATOR

Toko America Inc  

TK732xx

APPLICATION INFORMATION (CONT.)

PULSE CURRENT LIMIT MODE

CP

CN

RP

330 k

VIN

CIN

RIPK

TK732xx

VCONT

CONTINUOUS CURRENT LIMIT MODE

CN

VIN

CIN

CONT

RIPK

TK732xx

VCONT

EMITTER

BASE

EXTERNAL

TRANSISTOR

COLLECTOR

GND

CL

VOUT

EMITTER

BASE

EXTERNAL

TRANSISTOR

COLLECTOR

GND

CL

VOUT

The equation for the pulse output current limit is as follows:

ISET (mA) = 90 (mV) / RIPK (Ω)

VOUT

IOUT

During the initial turn-on, charge (surge) current flows to

the output capacitor. This IC has a possibility for the

current limit to operate and to turn off the output by the

charge current of the output capacitor. Therefore, the

relationship between CL and CP is set as shown in the

graph below:

In the continuous current limit mode, the CPULSE pin (pin 3)

is directly connected to ground. The output current limit is

set by R according to the following equation:

IPK

ISET (mA) = 100 (mV) / RIPK (Ω)

If the continuous current limit mode is also used for output

short circuit protection, the ISET value is set 50% to 100%

more than the maximum operating current. The current

transistor is selected from the ISET value. The output

voltage drops when the output current exceeds the ISET

value. However, the output voltage returns to normal once

the output current decreases below the ISET value.

1000

100

10

STABLE REGION

1

0.01

0.1

1

10

CP (µF)

Page 12

January 1999 TOKO, Inc.

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