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TSM101C-AC Datasheet(PDF) 10 Page - STMicroelectronics |
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TSM101C-AC Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 13 page  10/13 TSM101 integrates in the same 8 pin DIP or SO package • one 1.24V precision voltage reference • two operationnal amplifiers • two diodes which impose a NOR function on the outputs of the operationnal amplifiers • one current source which can be activated/ in- hibited thanks to an external pin. An immediate way to take advantage of the high integration and reliability of TSM101 is to use it as a voltage and current controller on power supplies secondary. The application note AN896 describes precisely how to use TSM101 in an SMPS battery charger. The TSM101 Evaluation Board is adaptable to any power supply or battery charger (SMPS or linear) as a voltage and current controller with minimal constraints from the user. HOW TO USE THE TSM101 EVALUATION BOARD ? The generic Electrical Schematic is shown on fig- ure 1. It represents an incomplete SMPS power supply where the primary side is simplified. The “IN+”and “IN-” power inputs of the evalua- tion board should be connected directly to the power lines of the power supply secondary. The “Vcc” input of the evaluation board should be connected to the auxiliary supply line. In the case of an SMPS power supply, the “Reg” output of the evaluation board should be connect- ed to the Optocoupler input to regulate the PWM block in the primary side. In the case of a linear power supply, the “Reg” output should be con- nected to the base of the darlington to regulate the power output. A diode might be needed on the output of the eval- uation board in the case of a battery charger appli- cation to avoid the discharge of the battery when the charger is not connected. COMPONENTS CALCULATIONS The voltage control is given by the choice of the resistor bridge R6/R7 (and the trimmer P1) due to equation 1 : • Vref = R6/(R6+R7)xVout eq1 where Vref = 1.24V Figure 1 EVALUATION BOARD -TECHNICAL NOTE |
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