SG3525 PWM Controller Module

SG3525 PWM Controller Module leverages the widely respected SG3525 pulse-width modulation controller IC, providing a robust, high-performance solution for designing modern switching power supplies and DC-DC converters. This module simplifies the integration of a highly stable oscillator, error amplifier, and output drivers into your circuit, allowing you to achieve precise voltage regulation and efficient power delivery. As a fixed-frequency device featuring feed-forward control and remote ON/OFF sequencing, the SG3525 module empowers engineers and hobbyists to construct sophisticated, high-power solutions such as inverters, battery chargers, and motor controllers where reliability and tight control are paramount.

Key Features:

• Highly Integrated Design: Incorporates the SG3525A IC, streamlining the creation of complex switching power circuits.
• Stable Internal Oscillator: Offers frequency control ranging from 1 Hz up to 400 kHz, adjustable with external resistors and capacitors (R_T and C_T).
• Shorted Output Protection: Includes an under-voltage lockout (UVLO) circuit and soft-start function to protect output devices during power-up and fault conditions.
• Push-Pull Output Stage: Features dual high-current output drivers capable of sinking and sourcing up to 200 mA, perfectly suited for driving power MOSFETs or IGBTs.
• Dead Time Control: Allows precise adjustment of the output dead time to prevent shoot-through currents in the external power stage, maximizing efficiency and component safety.

Technical Specifications:

• Input Voltage (V_IN): 8 V to 35 V DC
• Output Driver Current (Source/Sink): ≈ 200 mA (Peak)
• Oscillator Frequency Range: 1 Hz to 400 kHz
• Reference Voltage (V_REF): 5.1 V (±1%)
• Operating Temperature: ≈ -25°C to 85°C

Mechanical Specifications:

• Module Layout: Compact PCB with header pins for easy prototyping.
• Pin Pitch: Standard 2.54 mm (0.1 in) for breadboard and perfboard compatibility.
• Mounting: Typically includes pre-drilled holes for secure mounting within enclosures (varies by manufacturer).

Dimensions:

• PCB Length: ≈ 35 mm
• PCB Width: ≈ 30 mm
• Height (with components): ≈ 15 mm
• Weight: ≈ 8 g to 15 g

Pinout and Wiring:

• V_CC: Power input pin (Connect 8 V to 35 V DC power supply).
• GND: System ground connection.
• V_REF: Output for the stable 5.1 V reference voltage (Use for sensor or microcontroller power).
• Output A (OUTA) / Output B (OUTB): Push-pull outputs for driving external MOSFET gates.
• C_T / R_T: Connections for external capacitor and resistor to set the oscillation frequency.
• Shutdown (SD): Allows remote ON/OFF control; pulling low typically disables the output.
• Error Amp In (+): Non-inverting input of the error amplifier.
• Error Amp In (-): Inverting input of the error amplifier (Connect feedback voltage here).

Datasheet Reference:

• Download SG3525 PWM Controller Datasheet

Commonly Used in:

• Power Electronics Laboratories: Essential tool for experimental and educational power circuit design.
• UPS Manufacturing: Used as the core control element in high-frequency uninterruptible power supplies.
• Solar Inverter Systems: Regulating the DC-to-AC conversion stage for off-grid solutions.

Applications:

• High-Power DC-DC Converters: Building buck, boost, and isolated flyback converters.
• Pure Sine Wave and Modified Sine Wave Inverters: Generating the necessary PWM signals to control the H-bridge output stage.
• Brushless DC (BLDC) Motor Control: Providing the precise gate drive signals required for motor commutation.

Equivalent Models:

• TL494 PWM Controller: A popular, simpler, and slightly older alternative often used in lower-power applications.
• UC384x Series: Current-mode PWM controllers, preferred for high-speed, high-efficiency topologies.
• SG3524: The predecessor to the SG3525, offering similar functionality but with fewer advanced features.

Package Includes:

• 1 x SG3525 PWM Controller Module