SN71052 Datasheet, PDF (1/6 Pages) KODENSHI KOREA CORP. – Constant voltage and constant current controller for battery chargers and adapters

Semiconductor
http:// www.auk.co.kr
SN71052
Constant voltage and constant current controller
for battery chargers and adapters
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.
SOT-26
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.
ORDERING INFORMATION
Product
SN71052
Marking
702
Package
SOT-26
Application
◈ Battery chargers
◈ AC to DC adapters
Block Diagram
▲ Marking Detail Information
702(①)□(②)
① Device Code
② Week Code
KSD-I5P012-000
1
Dec, 2011 REV. 00