Description: 

The OB2365 is a highly integrated current mode PWM control IC designed for offline flyback converter applications. It's engineered for high efficiency, low standby power consumption, and cost-effective power supply design — commonly used in chargers, adapters, and small switch-mode power supplies (SMPS).

Specifications:

Key Features:

• Adaptive multi-mode operation for high efficiency across the full load range
• QR mode with valley switching at normal/high-line loads to reduce switching losses
• PFM mode with valley switching at light loads for improved conversion efficiency
• Extended Burst Mode at very light loads to minimize standby power consumption
• Fixed-frequency CCM mode at heavy loads under low-line input voltage
• Low VCC startup and operating current for reliable power-on behavior and low standby power design

Technical Notes:

• Mode switching (QR → PFM → Burst) is handled internally based on load conditions, requiring minimal external control circuitry.
• Well-suited for cost-sensitive designs needing good no-load/standby efficiency (e.g. energy-star compliant chargers).
• As a current mode controller, it requires an external current-sense element (typically a sense resistor) and works in conjunction with an external high-voltage MOSFET (unlike integrated "power switch" variants such as OB2365T, which include the MOSFET on-chip).

Common Applications:

• Phone/tablet USB wall chargers
• Small AC-DC power adapters
• Standby/auxiliary power supplies in appliances
• Charger repair and replacement (as a diagnostic/replacement part when a charger fails)

Package Includes: 

• 1x OB2365PCP On-Bright PWM Power Switch IC SOIC-8