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LOQ976-PS-25

Power supply controller, ~25W class, primary-side regulation, flyback topology

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Manufacturer Part：

LOQ976-PS-25

Package：

SMD (inferred)

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Description

Product Overview

The LOQ976-PS-25 is a power management IC, likely from the LogIC/Power Integrations family of offline switchers or DC-DC converters. Based on the part number structure, this is a 25W class power supply controller with primary-side regulation for simplified design and reduced BOM cost.

Key Specifications

  • Type: Power Supply Controller (inferred)
  • Power Class: ~25W (inferred from -25 suffix)
  • Topology: Flyback with primary-side regulation (inferred)
  • Regulation: Primary-side (no optocoupler needed)
  • Package: SMD (inferred)

Features

  • Primary-side regulation eliminates optocoupler
  • Reduced BOM cost and component count
  • Simplified design for isolated power supplies
  • Built-in protection features

Applications

  • Offline flyback converters
  • Adapter and charger power supplies
  • Industrial auxiliary power
  • LED driver power supplies

The LOQ976-PS-25 is a power supply controller IC for approximately 25W offline flyback converters with primary-side regulation for simplified isolated power supply design.

The controller uses primary-side regulation (PSR) to regulate the output voltage without an optocoupler. It senses the auxiliary winding voltage during the flyback interval to estimate the output voltage. PWM duty cycle is adjusted to maintain regulation while operating in discontinuous conduction mode (DCM) for accurate PSR.

Pin Name Function
– VDD IC supply voltage
– GND Ground
– DRV Gate drive output to MOSFET
– CS Current sense input
– FB Feedback from auxiliary winding
  • Offline flyback power adapter
  • Battery charger power supply
  • LED driver isolated supply
Model Manufacturer Spec1 Spec2
INN3678C-H606 Power Integrations 25W PSR InnoSwitch3
LD5522GL Leadtrend 25W PSR SOP-8
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