SG3525A Pulse Width Modulation Controller IC – DIP-16 Package

SG3525A Pulse Width Modulation Controller IC – DIP-16 Package

The SG3525A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip + 5.1 V reference is trimmed to ±1 % and the input common-mode range of the error amplifier includes the reference voltage eliminating external resistors. A sync input to the oscillator allows multiple units to slave or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provides a wide range of dead time ad- justment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuity and the output stages, providing instantaneous turn off through the PWM latch with the pulsed shutdown, as well as soft-start recycle with longer shutdown commands. These functions are also controlled by an Undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for sub-normal input voltages. This lockout circuitry includes approximately 500 mV of hysteresis for jitter-free operation. Another feature of these PWM circuits is a latch following the comparator. Once a PWM pulse has been terminated for any reason, the outputs will remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200 mA. The SG3525A output stage features NOR logic, giving a LOW output for an OFF state. This product is known as UC3525A, UC3525 PWM controller, SG3525A PWM controller, SG3525 PWM controller, SG3525 Pulse Width Modulation Controller, SG3525ANG, SG3525AP.

Features:

• 8 To 35 Operation
• 5.1 V Reference Trimmed TO ± 1 %
• 100 Hz TO 500 KHz Oscillator Range
• Separate Oscillator Sync Terminal
• Adjustable deadtime control
• Internal  Soft-Start
• Pulse-By-Pulse Shutdown
• Input Undervoltage Lockout with Hysteresis
• Latching PWM to prevent multiple Pulses
• Dual-Source/Sink Output Drivers

Features/Specs:

• Manufacturer: STMicroelectronics
• Manufacturer Part No: SG25S25A
• Supply Voltage: 40 V
• Collector Supply Voltage: 40 V
• Oscillator Charging Current: 5 mA
• Output Current, Source or Sink: 500 mA
• Reference Output Current: 50 mA
• Product Type: Switching Controllers
• Current through CT Terminal: 5 mA
• Logic Inputs: – 0.3 to + 5.5
• Analog Inputs: – 0.3 to Vi
• Rise Time: 100 ns
• Number of Outputs: 2 Output
• Switching Frequency: 400 kHz
• Duty Cycle – Max: 49 %
• Output Current: 400 mA
• Ptot Total Power Dissipation at Tamb = 70°C: 1000 mW
• Junction Temperature Range: –55 ~ 150°C
• Storage Temperature Range: –65 ~ 150°C
• Operating Ambient Temperature SG2525A: –25 ~ 85°C
• Mounting Style: Through Hole
• Package/Case: DIP-16