Overview
The SG3525ADWR2 is a pulse width modulator control circuit produced by onsemi. This integrated circuit is designed to offer improved performance and a lower external parts count, making it ideal for controlling all types of switching power supplies. The device features a trimmed +5.1 V reference voltage, a wide oscillator frequency range, and adjustable deadtime control. It also includes built-in soft-start circuitry, pulse-by-pulse shutdown, and input undervoltage lockout with hysteresis. The SG3525ADWR2 is available in a SOIC-16 WB package and is Pb-free, aligning with onsemi's Pb-free strategy.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 8.0 | 35 | Vdc | |
| Collector Supply Voltage (VC) | 4.5 | 35 | Vdc | |
| Reference Output Voltage (Vref) | 5.00 | 5.10 | 5.20 | Vdc |
| Oscillator Frequency Range (fosc) | 100 Hz | 400 kHz | ||
| Output Current, Source or Sink (IO) | 0 | ±400 mA | ||
| Operating Ambient Temperature Range (TA) | 0 | +70 | °C | |
| Thermal Resistance, Junction-to-Air (RθJA) | 100 | °C/W |
Key Features
- 8.0 V to 35 V operation
- 5.1 V ±1% trimmed reference voltage
- 100 Hz to 400 kHz oscillator range
- Separate oscillator sync pin for synchronization with external system clock
- Adjustable deadtime control using a single resistor
- Input undervoltage lockout with hysteresis
- Latching PWM to prevent multiple pulses
- Pulse-by-pulse shutdown
- Dual source/sink outputs capable of sourcing and sinking up to 400 mA peak
- Built-in soft-start circuitry requiring only an external timing capacitor
Applications
The SG3525ADWR2 is widely used in various switching power supply designs, including but not limited to:
- DC-DC converters
- AC-DC converters
- Power factor correction circuits
- Motor control systems
- Low power transformers and power FET drivers
Q & A
- What is the operating voltage range of the SG3525ADWR2?
The SG3525ADWR2 operates within a voltage range of 8.0 V to 35 V. - What is the reference voltage of the SG3525ADWR2?
The reference voltage is 5.1 V, trimmed to ±1%. - What is the oscillator frequency range of the SG3525ADWR2?
The oscillator frequency range is from 100 Hz to 400 kHz. - How is deadtime controlled in the SG3525ADWR2?
Deadtime can be programmed using a single resistor connected between the CT and Discharge pins. - What is the purpose of the soft-start circuitry in the SG3525ADWR2?
The soft-start circuitry helps in gradual startup of the power supply, preventing inrush currents and ensuring smooth operation. - How does the pulse-by-pulse shutdown feature work?
The pulse-by-pulse shutdown allows for instantaneous turn-off through the PWM latch with pulsed shutdown commands. - What is the maximum output current of the SG3525ADWR2?
The output stages can source or sink up to 400 mA peak. - What is the thermal resistance of the SG3525ADWR2?
The thermal resistance, junction-to-air (RθJA), is 100 °C/W. - Is the SG3525ADWR2 Pb-free?
- What are some common applications of the SG3525ADWR2?
The SG3525ADWR2 is used in DC-DC converters, AC-DC converters, power factor correction circuits, motor control systems, and low power transformers. - What are some common applications of the SG3525ADWR2?
