OB2560CMP

OB2560C High Precision CC/CV Primary-Side Controller FEATURES OB2560C 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 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. OB2560C offers comprehensive protection coverage with auto-recovery feature including Cycle-by-Cycle current limiting, VDD over voltage protection, feedback loop open protection, short circuit protection, built-in leading edge blanking, VDD under voltage lockout (UVLO), OTP etc. OB2560C is offered in SOT23-6 package.  Driving MOSFET  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 primary winding inductance compensation  Programmable cable drop compensation  No need for control loop compensation  Audio noise free operation  Built-in leading edge blanking (LEB)  Ultra low start-up current (typ. 1uA) and low operating current (typ. 650uA)  Comprehensive protection coverage with auto-recovery  Precise external OTP  VDD over voltage protection  VDD under voltage lockout with hysteresis (UVLO)  Cycle-by-Cycle current limiting  Feedback loop open protection  Output short circuit protection id en t ia lt o 同 维 GENERAL DESCRIPTION nf APPLICATIONS ht co 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 Figure.1. Typical CC/CV Curve O n- Br ig TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Preliminary datasheet OB_DOC_DS_2560C00 OB2560C High Precision CC/CV Primary-Side Controller Absolute Maximum Ratings Parameter VDD Voltage FB Input Voltage RT Input Voltage CS Input Voltage GATE Input Voltage Min/Max Operating Junction Temperature TJ Operating Ambient Temperature TA Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Note: GENERAL INFORMATION Value -0.3 to 30V -0.7 to 7V Note2 -0.3 to 7V -0.3 to 7V -0.3 to 24V -40 to 150 ℃ 同 维 Pin Configuration The pin map is shown as below for SOT23-6. -20 to 85 ℃ -55 to 150 ℃ o 260 ℃ ia lt en t Ordering Information Part Number Description OB2560CMP SOT23-6, Pb-free, T&R 1, Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. 2, The -0.7V bias condition, the input current injected into the pin should be limited to