The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on−chip +5.1 V reference is trimmed to 1% and the error amplifier has an input common−mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. A sync input to the oscillator enables multiple units to be slaved or a single unit to be synchronized to an external system clock. A wide range of deadtime can be programmed by a single resistor connected between the CT and Discharge pins. This device also features built−in soft−start circuitry, requiring only an external timing capacitor. A shutdown pin controls both the soft−start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft−start recycle with longer shutdown commands. The under voltage lockout inhibits the outputs and the changing of the soft−start capacitor when VCC is below nominal. The output stages are totem−pole design capable of sinking and sourcing in excess of 200 mA. The output stage of the SG3525A features NOR logic resulting in a low output for an off−state.
- 8.0 V to 35 V Operation
- 5.1 V +- 1.0% Trimmed Reference
- 100 Hz to 400 kHz Oscillator Range
- Separate Oscillator Sync Pin
- Adjustable Deadtime Control
- Input Under voltage Lockout
- Latching PWM to Prevent Multiple Pulses
- Pulse−by−Pulse Shutdown
- Dual Source/Sink Outputs: +-400 mA Peak
- Pb−Free Packages are Available
|Power Supply Voltage||VCC||40||Vdc|
|Collector Supply Voltage||VC||40||Vdc|
|Logic Inputs||−0.3 to +5.5||V|
|Output Current, Source or Sink||IO||40||mA|
|Reference Output Current||Iref||40||mA|
|Oscillator Charging Current||100||mA|
|Thermal Resistance, Junction−to−Air||RJA||1.25||°C/W|
|Operating Junction Temperature||Tj||150||°C|
|Storage Temperature Range||Tstg||−65 to +150||°C|
* product image for illustration purposes only. actual product may vary.
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