OB25136Q中文资料High Precision CC/CV Primary-Side PWM Power Switch数据手册OB规格书

描述 Description

OB25135/6Q is a high performance ofline 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 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. OB25135/6Q 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.

OB25135/6Q is offered in SOP8 package.

特性 Features

■Primary-side sensing and regulation without TL431 and opto-coupler
• 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)

应用 Application

Low Power AC/DC ofline SMPS for
■Cell Phone Charger
■Digital Cameras Charger
■Small Power Adapter
■ Auxiliary Power for PC, TV etc.
■Linear Regulator/RCC Replacement