BP5728

Data Sheet 100-200VAC Input/12W Output Isolated AC/DC Converter BP5728 Absolute Maximum Ratings Parameter 6pin Input Voltage 2pin Input Voltage 3pin Input Voltage 3pin Input Current Allowable Loss Max Surface Temperature Operating Temperature Range Storage Temperature Range Dimensions (Unit : mm) Limits 800 −0.2 to +6 24 8 0.64 105 −25 to +80 −25 to +105 Symbol VD VFB VDD IDD PD Tcmax Topr Tstg Unit V V V mA W °C °C °C 18.8MAX. 9.9MAX. 19.5MAX. MARKING SIDE 4.0±1.0 1 2 3 0.5±0.1 1.3±0.2 6 0.25±0.05 5.55MAX. 4.35MAX. 3.25MAX. 2.54±0.2 Electrical Characteristics Parameter Input voltage Output frequency Turn on voltage Turn off voltage Maximum Duty Zero-Duty IFB Parameter Over drain current protection Symbol VDD fo VDD on VDD off Duty MAX Ioz Symbol Idocp 2.54X5=12.7TYP. (VDD=15V, Vd=15V,IFB=0.1mA,SW1=R1,Ta=25°C, unless otherwise specified) Min. 8.9 59 15.5 7.7 68 0.85 VDD 10V 15V 20V Typ. 12 65 16.5 8.3 75 1.15 Min. 217 269 314 Max. 20 71 17.5 8.9 82 1.45 Typ. 247 302 349 Unit V kHz V V % mA Max. 281 338 388 Conditions Derating Curve Derating curve 0.8 0.7 − IFB=0.5mA VDD=0→17.5V VDD=17.5→0V IFB=0.5mA IFB=0→1.55mA Unit mA Conditions VD=0→15V SW1=R2 Allowable loss / W 0.6 0.5 0.4 0.3 0.2 0.1 0 -30 -10 10 30 Tsmax=105°C Operation range 50 70 90 Ambient Templature Ta / °C Conversion Efficiency (In case of 12V output) Conversion efficiency (Vi=311V, Ta=25°C) Application Circuit (In case of 12V output) Conversion efficiency / % F1 90 80 70 60 50 40 30 20 10 0 0 200 400 600 800 1000 Be sure to use fuse for safety. FL1 DB C2 C3 R1 + C4 NP D2 F2 3 2 1 NS T1 D4 C1 12V/0.5A(100V ) 12V/1A(200V ) Vo + C7 GND ZNR1 R2 R3 AC80 to 154V(100V ) AC154V to 286V(200V ) BP5728 6 D3 Output current / mA IC1 C5 ND C13 R5 IC2 R4 R6 Pin No. Terminal name 1 COM FB VDD VD 2 3 6 Terminal function Common terminal at primary side Feed back terminal Drain terminal for built-in FET Power supply terminal for internal drive Load regulation (In case of 12V output) Output charasteristic (Vi=311V, Ta=25°C) + R7 C12 R9 PC1 R8 Operating Principle 1.When turned on : C5 is charged by R2 when the power is on, and the switching starts 0 500 1000 1500 Output current / mA when the voltage at VDD pin reaches the voltage threshold (17.5V max.) Vdd is supplied via Nd and FB current flows to PC1 once Vo exceeds the threshold voltage. Once PC1 2.During operation : turns ON a current Ioz flows through the transistor. Also, FB current runs to Pin 2 of BP5728 when Vo exceeds the designed voltage and the constant voltage control is executed. 3.In overcurrent conditions : The input current will increase if the output power increases, and the overcurrent protection circuit will turn ON once the Drain current exceeds the specified value (Idocp). 14 12 10 8 6 4 2 0 Output voltage / V External Component Specifications C1,C2 : Noise reduction capacitors C3 : Input smoothing capacitor C4 : Noise reduction capacitor C5 : Vdd smoothing capacitor C7 : Output capacitor C12 : Phase compensation capacitor C13 : Noise reduction capacitor D2 : Rectifier diode D3 : Rectifier diode D4 : Rectifier diode DB : Diode bridge F1.F2 : Fuse IC1 : BP5728 Rated at 300VAC or higher 0.1 to 0.22µF 22µF / 450V 2200pF / 1kV 10µF / 50V 470µF / 35V low impedance 0.1µF / 50V 2200pF / AC250V FRD 800V / 0.5A 80V / 0.1A SBD 90V / 3A 800V / 1A Use for safety BP5728 IC2 : FL1 : R1 : R2 : R3 : R4 : R5 : R6 : R7 : R8 : R9 : PC1 : T1 : ZNR1 : Shunt regulator Noise reduction filter Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Photo coupler Switching transformer Varistor Vref=2.495V Use if necessary 0Ω 750kΩ 0.5W / 600V 200kΩ / 3W 51Ω / 0.125W 1kΩ / 0.1W 15kΩ / 0.1W 3kΩ / 0.1W 4.7kΩ / 0.1W 1kΩ / 0.1W PC817 SRW25ES-47V015(TDK) A varistor is required to protect against lightning surges and static electricity. www.rohm.com ©2010 ROHM Co., Ltd. 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