TK73246MCL Просмотр технического описания (PDF) - Toko America Inc

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производитель

TK73246MCL

LOW DROPOUT REGULATOR

Toko America Inc  

TK732xx

APPLICATION INFORMATION (CONT.)

ISET (Continuous Current Limit Mode) is set to the desired

charging current.

CHARGING CHARACTERISTICS

4.1 V

FINISH CHARGE

circuit condition, Tr1 is turned “off.” This converts the circuit

into the pulse current limit mode of operation, reducing the

power dissipation in the pass transistor. The transition

between the continuous and pulse current limit modes can

be controlled by adjusting the operating point of Tr1 by the

value of resistor R.

SET CHARGING CURRENT

IOUT

LITHIUM ION BATTERY CHARGER WITH

OVERDISSIPATION PROTECTION OF EXTERNAL

TRANSISTOR (SHORT CIRCUIT MODE)

(RECOMMENDED WITH TK732xxMCLH)

VIN

RIPK

Tr1

R

CONT

TK732xx

EMITTER

BASE

EXTERNAL

TRANSISTOR

COLLECTOR VOUT

CL

LOAD

During normal operation, Tr1 is turned ON, connecting pin

3 (CPULSE) to ground. This provides the continuous current

limit mode for normal operating conditions. During a short

January 1999 TOKO, Inc.

Page 15

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