Overview
The SG3525ADWG, produced by onsemi, is a pulse width modulator control circuit designed to enhance performance and reduce the external parts count in various switching power supply applications. This integrated circuit offers a wide range of features that make it versatile and reliable for different power supply designs.
Key aspects include an on-chip +5.1 V reference voltage trimmed to ±1%, a broad oscillator frequency range, and adjustable deadtime control. The device also features built-in soft-start circuitry, pulse-by-pulse shutdown, and input undervoltage lockout with hysteresis, ensuring robust and stable operation.
Key Specifications
| Characteristic | Symbol | 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 Sink/Source Current (Peak) | IO | ±400 mA | |||
| Operating Ambient Temperature Range | TA | 0 | +70 | °C | |
| Storage Temperature Range | Tstg | -55 | +125 | °C |
Key Features
- 8.0 V to 35 V operation range
- 5.1 V ±1.0% trimmed reference voltage
- 100 Hz to 400 kHz oscillator frequency range
- Separate oscillator sync pin for synchronization with external system clocks or other units
- Adjustable deadtime control using a single resistor
- Input undervoltage lockout with hysteresis
- Latching PWM to prevent multiple pulses
- Pulse-by-pulse shutdown and soft-start circuitry
- Dual source/sink output drivers capable of sinking and sourcing up to 400 mA peak
- Pb-free packages available
Applications
The SG3525ADWG is suitable for a variety of switching power supply applications, including:
- DC-DC converters
- AC-DC converters
- Power factor correction circuits
- Motor control systems
- High-frequency power supplies
- Push-pull and single-ended power supply configurations
Q & A
- What is the operating voltage range of the SG3525ADWG?
The SG3525ADWG operates within a voltage range of 8.0 V to 35 V.
- What is the accuracy of the on-chip reference voltage?
The on-chip reference voltage is trimmed to ±1% accuracy.
- What is the oscillator frequency range of the SG3525ADWG?
The oscillator frequency range is from 100 Hz to 400 kHz.
- How is deadtime controlled in the SG3525ADWG?
Deadtime can be programmed using a single resistor connected between the CT and Discharge pins.
- What is the purpose of the sync input pin?
The sync input pin allows multiple units to be slaved or synchronized to an external system clock.
- Does the SG3525ADWG have built-in soft-start circuitry?
Yes, the device features built-in soft-start circuitry that requires only an external timing capacitor.
- What is the maximum output current of the SG3525ADWG?
The output drivers can sink or source up to 400 mA peak current.
- Is the SG3525ADWG available in Pb-free packages?
Yes, Pb-free packages are available for the SG3525ADWG.
- What is the operating ambient temperature range of the SG3525ADWG?
The device operates within an ambient temperature range of 0°C to +70°C.
- What is the storage temperature range for the SG3525ADWG?
The storage temperature range is from -55°C to +125°C.
