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

PN8370 Low Standby-Power Quasi-Resonant Primary-Side Converter SOP-8 is an advanced high-performance PWM controller integrating primary-side regulation, designed for low-power AC-DC applications. It operates in quasi-resonant mode with ultra-low standby power consumption, making it ideal for chargers, adapters, and LED power supplies.

Key Features:

• Integrated PWM Controller: Simplifies power supply design without optocoupler.
• Quasi-Resonant Operation: Enables high efficiency and low EMI.
• Very Low Standby Power: Reduces no-load power consumption below 30mW.
• Built-in Protection: Includes OVP, OLP, SCP, OTP, and brown-in/out protection.
• Primary-Side Feedback: Eliminates need for secondary feedback circuitry.

Technical Specifications:

• Input Voltage: 85V to 265V AC
• Output Power: Up to 18W for 230V AC input
• Switching Frequency: Quasi-resonant, variable
• Standby Power: < 30mW at 230V AC input
• Efficiency: >85% with optimized transformer
• Protection Features: OVP, OLP, SCP, UVLO, OTP

Mechanical Specifications:

• Package Type: SOP-8 (Small Outline Package)
• Mounting Type: SMD (Surface Mount Device)
• Material: RoHS compliant plastic epoxy body

Dimensions:

• Body Width: ~3.9 mm
• Body Length: ~4.9 mm
• Height: ~1.5 mm
• Pin Pitch: 1.27 mm

Pinout and Wiring:

• Pin 1 (GND): Ground
• Pin 2 (FB): Feedback input
• Pin 3 (NC): Not Connected
• Pin 4 (VDD): Power supply input
• Pin 5-6 (DRAIN): Internal power MOSFET drain
• Pin 7 (NC): Not Connected
• Pin 8 (SOURCE): Source of internal MOSFET

Datasheet Reference:

• Search online for “PN8370 datasheet by Power Integrations or Chipown”

Applications:

• Mobile Chargers: Ideal for 5V USB power adapters and wall chargers
• LED Power Supply: Efficient constant-voltage or constant-current solutions
• Standby Supplies: Used in TV, monitor, or home appliance auxiliary supplies
• Low-Power SMPS: Suitable for consumer electronics up to 18W output

Equivalent Models:

• PN8368: Similar primary-side controller with slightly lower current rating
• OB2273: Quasi-resonant controller with comparable performance
• PIXIE PXA838: Integrated PSR controller alternative
• BP9916C: High-efficiency PSR controller for low-power LED drivers

Package Includes:

• 1 x PN8370 Quasi-Resonant Primary-Side PWM Controller (SOP-8)