PN8370 Low Standby-Power Quasi-Resonant Primary-Side Converter SOP-8

The PN8370 is a high-performance, low standby-power Quasi-Resonant (QR) Primary-Side Regulation (PSR) controller designed for flyback converters. It integrates a 700V power MOSFET and features high efficiency, optimized EMI performance, and minimal external components. Ideal for applications like adapters, chargers, and offline LED drivers, the PN8370 ensures precise output voltage and current regulation without the need for optocouplers or secondary feedback circuitry.

Key Features of PN8370 Low Standby-Power Quasi-Resonant PSR Converter:

• Integrated 700V MOSFET: Reduces BOM and improves reliability.
• Primary-Side Regulation (PSR): Eliminates optocoupler and secondary feedback circuitry.
• Quasi-Resonant Operation: Reduces switching loss and improves efficiency.
• Ultra-low Standby Power: Meets global energy efficiency standards.
• Adjustable Constant Current: Simplifies LED driver design with wide compatibility.
• Comprehensive Protection: Includes OVP, OCP, OTP, VDD clamp, and brown-in/out.

Technical Specifications of PN8370 Converter:

• Input Voltage Range: 85V to 265V AC
• Output Power: Up to 18W (adapter), up to 12W (open-frame)
• Switching Mode: Quasi-Resonant Flyback
• Standby Power: < 75mW @ 230V AC
• Start-up Current: < 3μA
• Operating Frequency: Varies based on load and QR timing

Mechanical Specifications of PN8370:

• Package Type: SOP-8
• Lead Finish: Matte Tin (Sn)
• RoHS Compliant: Yes

Pin Configuration of PN8370 (SOP-8):

• Pin 1 (GND): Ground
• Pin 2 (FB): Feedback input for output regulation
• Pin 3 (CS): Current sense input
• Pin 4 (VDD): Supply voltage
• Pin 5–6 (DRAIN): Internal high-voltage MOSFET drain
• Pin 7–8 (DRAIN): Internally connected to drain

Applications of PN8370 Converter:

• Mobile Chargers: Efficient and compact AC-DC conversion
• AC-DC Adapters: Up to 18W regulated output
• LED Drivers: Constant-current output regulation
• Set-top Boxes: Low-noise power supply
• Home Appliances: Energy-efficient embedded power systems

Schematic Diagram, Wiring and Functional Blocks:

• Schematic: Quasi-resonant flyback topology with primary regulation
• Connection: Minimal external components with CS and FB feedback design
• Functional Blocks: Includes VDD supply, start-up control, protection circuitry, and QR logic

Datasheet of PN8370:

• Download PN8370 Datasheet (PDF)

Equivalent Models of PN8370:

• OB2535: High-efficiency QR PSR controller
• LN5V06: Low-power PSR solution with internal MOSFET
• BP3309D: Integrated offline converter with good efficiency

Package Includes:

• 1 x PN8370 Low Standby-Power Quasi-Resonant PSR Converter (SOP-8)