KSD-I5P012-000

1

Dec, 2011 REV. 00

SN71052

Constant voltage and constant current controller

for battery chargers and adapters

▲ Marking Detail Information

①

Device Code

②

Week Code

Product

Marking

Package

SN71052

702

SOT-26

Description

The SN71052 is a highly integrated solution for SMPS applications

requiring a dual control loop to perform CV (constant voltage) and CC

(constant current) regulation. The SN71052 integrates a voltage reference,

Two Op-Amps (with OR-ed open-drain outputs), and a low-side current

sensing circuit. The voltage reference, along with one Op-Amp, is the core

of the voltage control loop; the current sensing circuit and the other Op-Amp

make up the current control loop.

The external components needed to complete the two control loops are:

■ A resistor divider that senses the output of the power supply

(adapter, battery charger) and fixes the voltage regulation set point at the

specified value;

■ A sense resistor that feeds the current sensing circuit with a voltage

proportional to the dc output current; this resistor determines the current

regulation set point and must be adequately rated in terms of power

dissipation;

■ Frequency compensation components (R-C networks) for both loops.

Application

◈

Battery chargers

◈

AC to DC adapters

S

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http:// www.auk.co.kr

ORDERING INFORMATION

SOT-26

702(①)

□(②)

Block Diagram