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SG3525A / SG3525AP 16-Pin PWM Controller IC — Push-Pull SMPS (5pcs)
SG3525A / SG3525AP 16-Pin PWM Controller IC Push-Pull SMPS (5pcs)
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SG3525A / SG3525AP — 16-Pin PWM Controller IC
The SG3525A is a classic voltage-mode PWM controller with complementary push-pull outputs, designed for push-pull, half-bridge, and full-bridge SMPS topologies. With a wide supply range of 8–35V, 400mA output drive, and programmable soft-start, it remains the go-to IC for inverter and DC-DC converter designs. This listing provides 5 pieces — new and original.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | SG3525A / SG3525AP |
| Package | DIP-16 / SOP-16 (per variant) |
| Supply Voltage (Vcc) | 8V – 35V |
| Output Current (peak) | 400mA sink/source (per output) |
| Oscillator Frequency | 100Hz – 500kHz |
| Output Mode | Complementary push-pull (50% max duty each) |
| Dead-Time Control | Programmable (CT discharge resistor) |
| Soft Start | Programmable (external capacitor) |
| Reference Voltage | 5.1V ±1% internal |
| Error Amplifier | 1 (with 70dB gain, 1MHz GBW) |
| Operating Temperature | 0°C to +70°C (A grade) |
| Quantity | 5 PCS |
Why Choose SG3525A?
- ✅ Complementary push-pull outputs — directly drives transformer primary in push-pull/half-bridge topologies
- ✅ 400mA output drive — 2× higher than TL494, drives larger MOSFETs directly
- ✅ Programmable soft-start — prevents inrush current on startup
- ✅ Shutdown pin — immediate output disable for protection circuits
- ✅ Wide frequency range — 100Hz to 500kHz for diverse SMPS designs
Compatible With / Works With
- Push-pull inverter transformer drivers (EE42, EE55, EI66 cores)
- 12V to 220V pure sine wave inverter driver stages
- Half-bridge DC-DC converter control (48V to 12V)
- N-channel MOSFET pairs: IRF3205, IRFZ44N, STP75NF75
- Gate driver ICs: IR2110, TC4420 (for high-frequency designs)
Typical Applications
- 12V–220V Inverter — push-pull driver for EE42/EE55 transformer, 500W–1kW
- UPS Inverter Stage — SPWM generation for sine-wave UPS output
- DC-DC Converter — half-bridge 48V to 12V/5V converter for telecom
- Motor Drive — H-bridge PWM control for DC servo motors
- Induction Heater — resonant half-bridge driver with ZVS detection
FAQ
Q: What is the difference between SG3525A and SG3525?
A: SG3525A is the improved version with tighter reference voltage tolerance (±1% vs ±2%) and better temperature stability. Always prefer SG3525A for new designs.
Q: How does SG3525A differ from TL494?
A: SG3525A has 400mA output (vs 200mA for TL494), a dedicated shutdown pin, and complementary outputs with built-in dead-time. TL494 has dual error amplifiers. SG3525A is preferred for push-pull inverter designs.
Q: How do I set the switching frequency?
A: Connect RT between pin 6 and Vref (pin 16), CT between pin 5 and GND. Frequency ≈ 1 / (CT × (0.7 × RT + 3 × RD)), where RD is the dead-time resistor on pin 5. For 50kHz: RT=10kΩ, CT=2.2nF.
Package Contents
- 5× SG3525A / SG3525AP 16-Pin PWM Controller IC
