Overview
The SG3525ADW is a pulse width modulator control circuit produced by Microsemi Corporation, now part of Onsemi. This integrated circuit is designed to control all types of switching power supplies, offering improved performance and a lower external parts count. It features a +5.1 V trimmed reference voltage, an error amplifier, and a wide range of oscillator frequencies. The device is particularly useful in applications requiring high efficiency and reliability in power supply systems.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Operating Supply Voltage | 8.0 to 35 | V |
| Reference Output Voltage | 5.00 to 5.20 | Vdc |
| Oscillator Frequency Range | 100 Hz to 400 kHz | |
| Output Current (Source or Sink) | ±500 | mA |
| Power Dissipation (TA = +25°C) | 1000 to 2000 | mW |
| Operating Junction Temperature | -55 to +150 | °C |
| Storage Temperature Range | -55 to +125 | °C |
| Lead Temperature (Soldering, 10 seconds) | +300 | °C |
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
- Adjustable deadtime control
- Input undervoltage lockout
- Latching PWM to prevent multiple pulses
- Pulse-by-pulse shutdown
- Dual source/sink outputs: ±400 mA peak
- Built-in soft-start circuitry
- Pb-free packages available
Applications
The SG3525ADW is widely used in various power supply applications, including:
- Switching power supplies
- DC-DC converters
- Power inverters
- Motor control systems
- High-efficiency power systems
Q & A
- What is the operating supply voltage range of the SG3525ADW?
The operating supply voltage range is from 8.0 V to 35 V. - What is the reference output voltage of the SG3525ADW?
The reference output voltage is +5.1 V ±1%. - What is the oscillator frequency range of the SG3525ADW?
The oscillator frequency range is from 100 Hz to 400 kHz. - What is the maximum output current of the SG3525ADW?
The maximum output current is ±500 mA. - Does the SG3525ADW have built-in soft-start circuitry?
Yes, it has built-in soft-start circuitry requiring only an external timing capacitor. - Can the SG3525ADW be synchronized with an external system clock?
Yes, it has a sync input to the oscillator for synchronization with an external system clock. - What is the maximum operating junction temperature of the SG3525ADW?
The maximum operating junction temperature is +150°C. - Is the SG3525ADW available in Pb-free packages?
Yes, Pb-free packages are available. - What is the purpose of the shutdown pin on the SG3525ADW?
The shutdown pin controls both the soft-start circuitry and the output stages, providing instantaneous turn-off and soft-start recycle. - Can the SG3525ADW drive power FETs directly?
Yes, the SG3525ADW can drive power FETs directly, and it is also capable of driving low power transformers.
