SG 3525 SG3525 SMD IC

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 onchip +5.1V reference is
trimmed to 1% and the error amplifier has an input commonmode 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 dead time
can be programmed by a single resistor connected between the CT and Discharge pins. This device also
features builtin softstart circuitry, requiring only an external timing capacitor. A shutdown pin controls both
the softstart circuitry and the output stages, providing instantaneous turn off through the PWM latch with
pulsed shutdown, as well as softstart recycle with longer shutdown commands. The under voltage lockout
inhibits the outputs and the changing of the softstart capacitor when VCC is below nominal. The output
stages are totempole 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 offstate.
Specification:

• 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
• PulsebyPulse Shutdown
• Dual Source/Sink Outputs: 400 mA Peak
• PbFree Packages are Available*

Package Includes :
1x IC SG3525 KA3525 PWM Controller IC 16-DIP