Part Number: OB2500N
Function: High Precision CC/CV Primary-Side Power Switch
Manufacturer: On-Bright Electronics
Images:
Description
OB2500N is a high performance offline PSR power switch for low power AC/DC charger and adapter applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
Device operates in PFM in CC mode at large load condition and it operates in PWM with frequency reduction at light/medium load. The chip consumes very low operation current. It achieves less than 75mW standby power to meet strict standby power standard. […]
Features:
Primary-side sensing and regulation without
TL431 and opto-coupler
High precision constant voltage and current regulation at universal AC input
Multi-mode PWM/PFM operation for efficiency improving
Integrated 1A 650V MOSFET
Good dynamic response
Programmable CV and CC regulation
Built-in primary winding inductance compensation
Programmable cable drop compensation
No need for control loop compensation
Applications:
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
OB2500N PDF Datasheet
