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TSM1052 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. TSM1052
Description  Constant voltage and constant current controller for battery chargers and adapters
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TSM1052 Datasheet(HTML) 1 Page - STMicroelectronics

 
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February 2008
Rev 2
1/15
15
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
SOT23-6 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.
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
(RC 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.
SOT23-6
www.st.com
Table 1.
Device summary
Part number
Package
Packaging
TSM1052
SOT23-6
Tape and reel


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