Overview
The SG3525AP, produced by STMicroelectronics, is a pulse width modulator integrated circuit designed to enhance performance and reduce the external component count in various switching power supply designs. This IC operates within a wide supply voltage range of 8 to 35 volts and features a highly accurate on-chip 5.1 V reference voltage trimmed to ±1%. The device is versatile and includes several key features that make it suitable for a broad range of power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vi) | 8 to 35 | V |
| Collector Supply Voltage (VC) | 4.5 to 35 | V |
| Oscillator Frequency Range | 100 Hz to 500 KHz | |
| Reference Voltage (VREF) | 5.1 ± 1% | V |
| Output Current (Source or Sink) | Up to 200 mA | mA |
| Input UnderVoltage Lockout | Approx. 6 to 8 V with 500 mV hysteresis | V |
| Operating Ambient Temperature | 0 to 70 °C | °C |
| Total Power Dissipation at Tamb = 70 °C | 1000 mW | mW |
Key Features
- Operates from 8 to 35 V supply voltage
- 5.1 V reference voltage trimmed to ±1% accuracy
- Oscillator frequency range from 100 Hz to 500 KHz, with synchronization to an external clock signal
- Adjustable dead time control for optimal efficiency and performance
- Internal soft-start circuitry to prevent overshoot and stress on components
- Pulse-by-pulse shutdown mechanism for overcurrent protection
- Input under voltage lockout with hysteresis to prevent operation at low input voltages
- Latching PWM logic to prevent multiple pulses and ensure stable operation
- Dual source/sink output drivers capable of delivering up to 200 mA of current
- Separate oscillator sync terminal for multiple unit synchronization or external system clock synchronization
Applications
The SG3525AP is widely used in the design of various types of switching power supplies, including DC-DC converters, AC-DC converters, and other power management systems. Its features make it suitable for applications in telecommunications, industrial power supplies, and consumer electronics where efficient and reliable power conversion is critical.
Q & A
- What is the operating supply voltage range of the SG3525AP?
The SG3525AP operates from 8 to 35 V.
- What is the accuracy of the on-chip reference voltage?
The on-chip 5.1 V reference voltage is trimmed to ±1% accuracy.
- What is the oscillator frequency range of the SG3525AP?
The oscillator frequency range is from 100 Hz to 500 KHz.
- Does the SG3525AP have internal soft-start circuitry?
Yes, the SG3525AP features internal soft-start circuitry.
- What is the purpose of the input under voltage lockout?
The input under voltage lockout prevents the device from operating at sub-normal input voltages and includes approximately 500 mV of hysteresis for jitter-free operation.
- Can the SG3525AP be synchronized to an external clock signal?
Yes, the SG3525AP has a separate oscillator sync terminal that allows synchronization to an external system clock.
- What is the maximum output current of the SG3525AP's output drivers?
The output drivers can source or sink up to 200 mA of current.
- Does the SG3525AP have pulse-by-pulse shutdown capability?
Yes, the SG3525AP features a pulse-by-pulse shutdown mechanism for overcurrent protection.
- What is the operating ambient temperature range of the SG3525AP?
The operating ambient temperature range is from 0 to 70 °C.
- What are some common applications of the SG3525AP?
The SG3525AP is commonly used in DC-DC converters, AC-DC converters, and other power management systems in telecommunications, industrial power supplies, and consumer electronics.
