TSM1052 Datasheet, PDF (1/15 Pages) STMicroelectronics – Constant voltage and constant current controller for battery chargers and adapters

TSM1052
Constant voltage and constant current controller
for battery chargers and adapters
Features
■ Secondary-side constant voltage and constant
current control
■ Very low voltage operation
■ Very low quiescent consumption
■ High-accuracy internal reference
■ Low external component count
■ Wired-or open-drain output stage
■ Easy frequency compensation
■ SOT23-6L micro package
Applications
■ Battery chargers
■ AC-DC adapters
Description
The TSM1052 is a highly integrated solution for
SMPS applications requiring a dual control loop to
perform CV (constant voltage) and CC (constant
current) regulation.
The TSM1052 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.
SOT23-6L
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.
The TSM1052, housed in one of the smallest
package available, is ideal for space-shrunk
applications such as adapters and chargers.
Table 1.
Device summary
Part number
TSM1052
Package
SOT23-6L
Packaging
Tape and reel
February 2007
Rev 1
1/15
www.st.com
15