Overview
The SG3525ADWR2G is a pulse width modulator control circuit produced by onsemi. This device is designed to control all types of switching power supplies, offering improved performance and a reduced external parts count. It features an on-chip +5.1 V reference voltage trimmed to ±1%, an error amplifier with a wide input common-mode voltage range, and a sync input for oscillator synchronization. The SG3525ADWR2G also includes built-in soft-start circuitry, adjustable deadtime control, and under-voltage lockout. The output stages are totem-pole design, capable of sourcing and sinking in excess of 200 mA.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 8.0 | 35 | Vdc | |
| Collector Supply Voltage | VC | 4.5 | 35 | Vdc | |
| Oscillator Frequency Range | fosc | 0.1 | 400 | kHz | |
| Output Current, Source or Sink | IO | 0 | ±400 | mA | |
| Reference Output Voltage | Vref | 5.00 | 5.10 | 5.20 | Vdc |
| Operating Ambient Temperature Range | TA | 0 | +70 | °C | |
| Thermal Resistance, Junction-to-Air | RθJA | 100 | °C/W | ||
| Storage Temperature Range | Tstg | -55 | +125 | °C |
Key Features
- 8.0 V to 35 V operation
- +5.1 V reference voltage trimmed to ±1%
- 100 Hz to 400 kHz oscillator range
- Separate oscillator sync pin for synchronization
- Adjustable deadtime control
- Input under-voltage 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 SG3525ADWR2G is suitable for a wide range of switching power supply applications, including:
- DC-DC converters
- AC-DC converters
- Power factor correction circuits
- Half-bridge and full-bridge configurations
- Driving power FETs and low-power transformers
Q & A
- What is the operating voltage range of the SG3525ADWR2G?
The SG3525ADWR2G operates within a supply voltage range of 8.0 V to 35 V.
- What is the oscillator frequency range of the SG3525ADWR2G?
The oscillator frequency range is from 100 Hz to 400 kHz.
- Does the SG3525ADWR2G have built-in soft-start circuitry?
Yes, the SG3525ADWR2G features built-in soft-start circuitry that requires only an external timing capacitor.
- How can the deadtime be adjusted in the SG3525ADWR2G?
The deadtime can be programmed by a single resistor connected between the CT and Discharge pins.
- What is the maximum output current of the SG3525ADWR2G?
The output stages can source or sink up to ±400 mA peak.
- Does the SG3525ADWR2G have under-voltage lockout?
Yes, the device includes an under-voltage lockout feature that inhibits the outputs when VCC is below nominal.
- Can the SG3525ADWR2G be synchronized with an external system clock?
Yes, the device has a sync input to the oscillator that enables synchronization with an external system clock.
- What is the thermal resistance, junction-to-air, of the SG3525ADWR2G?
The thermal resistance, junction-to-air, is 100 °C/W.
- Is the SG3525ADWR2G available in Pb-free packages?
Yes, Pb-free packages are available for the SG3525ADWR2G.
- What is the storage temperature range for the SG3525ADWR2G?
The storage temperature range is from -55 °C to +125 °C.
