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DESCRIPTION

The TSM121 integrated circuit incorporates all sensing circuit to regulate and protect from over voltage, under voltage and over current a multiple output power supply (12V, 5V, 3.3V).

■ HOUSEKEEPING CIRCUIT :

■ Over voltage protection for 3.3V, 5V and 12V without external components

■ Additional Over voltage protection (-5V and/ or -12V, or Primary Over Power control) with external components

■ Under voltage protection for 3.3V, 5V and 12V without external components

■ Over current protection for 3.3V, 5V and 12V with internal threshold voltage

■ Externally adjustable Inrush Current blanking during transients

■ Externally adjustable Under voltage blanking during Power Up

■ Power Good output

■ Externally adjustable PG delay

■ Remote input

■ Externally adjustable Remote delay

■ Internal Precision Voltage Reference (Vref1)

■ PWM GENERATOR :

■ Error Amplifier (easy compensation)

■ Oscillator (adjustable frequency)

■ PWM generation

■ Soft Start & Dead Time Control (adjustable)

■ Open collector outputs for indirect Pulse Transformer driving

■ Precision Voltage Reference (Vref2) (Uncommitted with Vref1)

APPLICATION

■ Primary PWM and secondary housekeeping in PC/Server SMPS using Half Bridge topology