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TSM1052 Datasheet(PDF) 1 Page - STMicroelectronics |
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TSM1052 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 15 page  February 2007 Rev 1 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 ■ SOT23-6L 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. 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. SOT23-6L www.st.com Table 1. Device summary Part number Package Packaging TSM1052 SOT23-6L Tape and reel |
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