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1、 On-Bright Electronics Confidential Preliminary datasheet OB_DOC_DS_2570x00 - 1 - High Performance QR mode Primary-Side Power Switch OB2570x GENERAL DESCRIPTION OB2570x is an excellent primary side regulation controller with CC/CV operation for medium level power AC/DC charger and adapter applicatio
2、ns. The device integrates an internal power MOSFET and operates in QR mode to provide high efficiency along with several functions of built-in protections. It removes the need for secondary feedback circuitry to lower the total bill of material cost. Proprietary Constant Voltage (CV) and Constant Cu
3、rrent (CC) control is integrated as shown in the figure below. In CV control, the controller changes the mode of operation according to load condition. At full loading, the controller operates in quasi-resonant (QR) mode in the universal line voltage. The primary side regulation power supplies up to
4、 high power without the efficiency limitation of DCM or audible noise. In CC control, OB2570x samples the Vcs peak current and the demagnetization pulse to regulation the output current. The current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. OB2570x offer
5、s comprehensive protection coverage with auto-recovery feature including Cycle-by-Cycle current limiting, VDD OVP, OLP, SCP, OTP etc. OB2570x consumes less than 75mW input power at no- load condition with high line voltage. OB2570x is offered in SOP8 package. Figure.1. Typical CC/CV Curve FEATURES P
6、rimary-side sensing and regulation operates in QR mode without TL431 and opto-coupler High precision constant voltage and current regulation at universal AC input Programmable CV and CC regulation Integrated power MOSFET Good dynamic response Built-in line compensation for tight CC regulation Built-
7、in fixed cable compensation Built-in primary winding inductance compensation Built-in control loop compensation Built-in leading edge blanking (LEB) Ultra low start-up current and low operating current Comprehensive protection coverage with auto-recovery VDD over voltage protection (VDD OVP) VDD und
8、er voltage lockout with hysteresis (UVLO) Cycle-by-cycle current limiting Feedback open loop protection (OLP) Output short circuit protection (SCP) APPLICATIONS Medium level Power AC/DC offline SMPS for Cell phone charger Tablet PC AC/DC adapter Set-top box power supplies TYPICAL APPLICATION On-Brig
9、ht confidential to 力索微 On-Bright Electronics Confidential Preliminary datasheet OB_DOC_DS_2570x00 - 2 - High Performance QR mode Primary-Side Power Switch OB2570x GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOP8. FB VDD DRAIN1 2 36 GND 5 CS 4 7 8 DRAIN DRAIN DRAIN Orderin
10、g Information Part Number Description OB2570PCP SOP8, Halogen-free in Tube OB2570PCPA SOP8, Halogen-free in T&R OB2570TCP-H SOP8, Halogen-free in Tube OB2570TCPA-H SOP8, Halogen-free in T&R Package Dissipation Rating Package RJA (/W) SOP8 150 Absolute Maximum Ratings Parameter Value VDD Voltage -0.3
11、 to 30V FB Input Voltage -0.3 to 7V RT InputVoltage -0.3 to 7V CSInput Voltage -0.3 to 7V GATEInput Voltage -0.3 to 24V Min/Max Operating Junction Temperature TJ -40 to 150 Operating Ambient Temperature TA -20 to 85 Min/Max Storage Temperature Tstg -55 to 150 Lead Temperature (Soldering, 10secs) 260
12、 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 t
13、o absolute maximum-rated conditions for extended periods may affect device reliability. Recommended Operating Condition Symbol Parameter Range VDD VDD Supply Voltage 9 to 25V OB2570x X X X -X High Performance QR mode Primary-Side Power Switch Package H:650V Blank:Tube A: Tape/Reel Packing Package Gr
14、een P:Halogen-free BVdss C:SOP8 Marking Information On-Bright confidential to 力索微 On-Bright Electronics Confidential Preliminary datasheet OB_DOC_DS_2570x00 - 3 - High Performance QR mode Primary-Side Power Switch OB2570x TERMINAL ASSIGNMENTS Pin Num Pin Name I/O Description 1 VDD P Power Supply 2 G
15、ND P Ground 3 FB I The voltage feedback from auxiliary winding. Connected to resistor divider from auxiliary winding reflecting output voltage. 4 CS I Current sense input. Connect a sense resistor from this pin to ground. 5,6,7,8 DRAIN O Internal MOSFET DRAIN output On-Bright confidential to 力索微 On-
16、Bright Electronics Confidential Preliminary datasheet OB_DOC_DS_2570x00 - 4 - High Performance QR mode Primary-Side Power Switch OB2570x BLOCK DIAGRAM On-Bright confidential to 力索微 On-Bright Electronics Confidential Preliminary datasheet OB_DOC_DS_2570x00 - 5 - High Performance QR mode Primary-Side Power Switch OB2570x ELECTRICAL CHARA
