GENERAL DESCRIPTION
OB2510RL is a high performance offline PSR controller 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 as well at large load condition and it operates in PWM with frequency reduction at light/medium load. The chip consumes very low operation current, it can achieve less than 75mW standby power.
OB2510RL offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD over voltage protection, short circuit protection, built-in leading edge blanking, VDD under voltage lockout (UVLO), OTP etc.
OB2510RL is offered in SOT23-5 package.
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
Good dynamic response
Programmable CV and CC Regulation
Built-in Line Voltage and Primary Winding Inductance Compensation
Programmable Cable Drop Compensation
No Need For Control Loop Compensation
Audio Noise Free Operation
Drive BJT Switch
Built-in Leading Edge Blanking (LEB)
Comprehensive Protection Coverage with auto-recovery
VDD Over Voltage Protection
VDD Under Voltage Lockout with Hysteresis (UVLO)
Cycle-by-Cycle Current Limiting
Feedback Loop Open Protection
Output Short Circuit Protection
Over Temperature Protection (OTP)
APPLICATIONS
Low Power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
TYPICAL APPLICATION
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