SG3527AN - Motorola

SG3527AN PULSE WIDTH MODULATOR

Order this document by SG3525A/D Pulse Width Modulator Control Circuits The SG3525A, SG3527A pulse width modulator control circuits offer 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 v.

Features

NOR logic resulting in a low output for an off
  –state while the SG3527A utilized OR logic which gives a high output when off.
• 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 Undervoltage Lockout
• Latching PWM to Prevent Multiple Pulses
• Pulse
  –by
  –Pulse Shutdown
• Dual Source/Sink Outputs: ±400 mA Peak Representative Block Diagram 16 Vref 15 VCC 12 Ground 4 OSC Output 3 Sync 6 RT 5 CT 7 Discharge 9 Compensation 1 INV. Input 2 Noninv. Input 8 CSoft
  –Start 10 Shutdown Reference R.