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OB2535 Dataheets PDF



Part Number OB2535
Manufacturers On-Bright Electronics
Logo On-Bright Electronics
Description High Precision CC/CV Primary-Side PWM Power Switch
Datasheet OB2535 DatasheetOB2535 Datasheet (PDF)

OB2535 High Precision CC/CV Primary-Side PWM Power Switch GENERAL DESCRIPTION OB2535 is a high performance offline PWM Power switch for low power AC/DC charger and adaptor 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.

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OB2535 High Precision CC/CV Primary-Side PWM Power Switch GENERAL DESCRIPTION OB2535 is a high performance offline PWM Power switch for low power AC/DC charger and adaptor 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. OB2535 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. High precision constant voltage (CV) and constant current (CC) can be achieved by OB2535. . FEATURES „ 5% Constant Voltage Regulation, 5% Constant Current Regulation at Universal AC input „ Primary-side Sensing and Regulation Without TL431 and Opto-coupler „ Programmable CV and CC Regulation „ Adjustable Constant Current and Output Power Setting „ Built-in Secondary Constant Current Control with Primary Side Feedback „ Built-in Adaptive Current Peak Regulation „ Built-in Primary winding inductance compensation „ Programmable Cable drop Compensation „ Power on Soft-start „ Built-in Leading Edge Blanking (LEB) „ Cycle-by-Cycle Current Limiting „ VDD Under Voltage Lockout with Hysteresis (UVLO) „ VDD OVP „ VDD Clamp APPLICATIONS Low Power AC/DC offline SMPS for „ Cell Phone Charger „ Digital Cameras Charger „ Small Power Adaptor „ Auxiliary Power for PC, TV etc. „ Linear Regulator/RCC Replacement OB2535 is offered in SOP8 package. Fig.1. Typical CC/CV Curve TYPICAL APPLICATION ©On-Bright Electronics -1- Confidential OB_DOC_DS_253502 OB2535 High Precision CC/CV Primary-Side PWM Power Switch GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOP8 Package Dissipation Rating Package RθJA (℃/W) SOP8 90 Note: Drain Pin Connected 100mm2 PCB copper clad. VDD 1 8 GND COMP 2 7 GND INV 3 6 DRAIN CS 4 5 DRAIN Ordering Information Part Number Description OB2535CP SOP8, Pb-free, Tube OB2535CPA SOP8, Pb-free, T&R Absolute Maximum Ratings Parameter Value Drain Voltage (off state) -0.3V to Bvdss VDD Voltage -0.3 to VDD_clamp VDD Zener Clamp 10 mA Continuous Current COMP Voltage -0.3 to 7V CS Input Voltage -0.3 to 7V INV Input Voltage -0.3 to 7V Min/Max Operating -20 to 150 oC Junction Temperature TJ Min/Max Storage -55 to 150 oC Temperature Tstg Lead Temperature 260 oC (Soldering, 10secs) Note: 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. ©On-Bright Electronics -2- Confidential OB_DOC_DS_253502 Marking Information OB2535 High Precision CC/CV Primary-Side PWM Power Switch OB2535CP YWW S C:SOP8 Package P:Pb-free Package Y:Year Code(0-9) WW:Week Code(01-52) S:Internal Code(Optional) TERMINAL ASSIGNMENTS Pin Num Pin Name 1 VDD 2 COMP 3 INV 4 CS 5/6 DRAIN 7/8 GND I/O Description P Power Supply I Loop Compensation for CV Stability The voltage feedback from auxiliary winding. Connected to resistor divider I from auxiliary winding reflecting output voltage. PWM duty cycle is determined by EA output and current sense signal at pin 4. I Current sense input O HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer P Ground OUTPUT POWER TABLE Product OB2535 230VAC±15% Adapter1 6W 85-264VAC Adapter1 5W Notes: 1. Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50℃ ambient. ©On-Bright Electronics -3- Confidential OB_DOC_DS_253502 OB2535 High Precision CC/CV Primary-Side PWM Power Switch BLOCK DIAGRAM VDD 1 POR UVLO Internal 5V Supply Gate Driver DRAIN 5/6 Power MOSFET CC Controller Drop Comp 2V INV 3 Sampler EA PWM Generator CLK Genterator Sampling Controller Frequency Shuffling 2 COMP Soft start OCP LEB CS 4 GND 7/8 ©On-Bright Electronics -4- Confidential OB_DOC_DS_253502 OB2535 High Precision CC/CV Primary-Side PWM Power Switch ELECTRICAL CHARACTERISTICS (TA = 25OC, VDD=VDDG=16V, if not otherwise noted) Symbol Parameter Test Conditions Min Typ Max Unit Supply Voltage (VDD) Section I DD ST Standby Current VDD=.


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