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| Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS General Description The AP3902 PWM power switch consists of a fixedfrequency current-mode PWM controller and a high voltage transistor. It is specifically designed for high performance off-line switching power supplies or nonisolated small household applications. Compared to discrete MOSFET and PWM controller power supply solutions, AP3902 solution offers advantages such as fewer component numbers, smaller size, and lower total cost. In normal operation, the AP3902 features with a fixed switching frequency. When the output power falls below a given level, the circuits automatically switches to a burst mode by skipping some switching cycles. In case of failure modes like open loop, over voltage or overload due to short circuit, the device switches into auto restart mode which is controlled by the internal protection unit. This IC adopts frequency dithering technique to reduce EMI. The AP3902 is available in DIP-8 package. AP3902 Features * * * * * * * * * Built-in NPN Transistor with 700VCBO Current Mode Control with Skip Cycle Capability Low Operating Current: 0.45mA Fixed Switching Frequency: 60kHz Frequency Dithering for Low EMI Short Circuit Protection Open and Short Circuit Protection for OptoCoupler Maximal Input Power less than 0.2W under no Load Output Power Range: 5W to 10W for Adapter with Outer Enclosure 5W to 13W for Open Frame Application Applications * * * * * Induction Cooker Set-Top Boxes/DVB Adapters Auxiliary Power Supplies DVD DIP-8 Figure 1. Package Type of AP3902 Sep. 2008 Rev. 1.0 1 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Pin Configuration P Package ( DIP-8) VA VS VCC B 1 2 3 4 8 7 6 5 GND NC C C AP3902 Figure 2. Pin Configuration of AP3902 (Top View) Pin Description Pin Number 1 2, 3 4 5, 6 7 8 Pin Name VA VS VCC B C NC GND Function This pin is used for short circuit protection, and it will be pulled to low level when short circuit happens at the load terminal It is used for line voltage compensation, and PWM uses this pin to terminate the output switch conduction The power supply of the IC and it is also used for the feedback control It is internally connected with the base terminal of internal NPN transistor It is internally connected with the collector terminal of internal NPN transistor No connection to IC Supply ground Sep. 2008 Rev. 1.0 2 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Functional Block Diagram AP3902 VCC 3 Start-up Current Source Bias OSC NPN Transistor 5, 6 C 4 UVLO B + VREF (1.2 V) FB + Emitter OUT PWM Comparator PWM Logic Driver VREF - VS 2 Short Circuit Protection Slope Compensation 1 VA + VREF (1.2 V) Discharge Comparator Discharge Logic 8 - GND Figure 3. Functional Block Diagram of AP3902 Sep. 2008 Rev. 1.0 3 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Ordering Information AP3902 Circuit Type Package P: DIP-8 E1: Lead Free G1: Green Blank: Tube AP3902 Package DIP-8 Temperature Range -40 to 85oC Part Number Lead Free AP3902P-E1 Green AP3902P-G1 Marking ID Lead Free AP3902P-E1 Green AP3902P-G1 Packing Type Tube BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with "G1" suffix are available in green packages. Absolute Maximum Ratings (Note 1) Parameter Collector Pin Voltage Voltage at the Emitter of Internal NPN Transistor Supply Voltage Analog Input at VS VA Pin Voltage Continuous Collector Current Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10s) ESD (Human Body Model) Symbol VCES VE VCC VS VA Value 700 -0.3 to 40 -0.3 to 6.3 -0.3 to 6.3 -0.3 to 40 1 1.3 150 -65 to 150 300 3000 Unit V V V V V A W oC o o C C V Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and 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 Ratings" for extended periods may affect device reliability. Sep. 2008 Rev. 1.0 4 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Electrical Characteristics (VCC=4V, TJ=25oC, unless otherwise specified.) Parameter Power Transistor Section Collector-Emitter Breakdown Voltage Collector-Emitter Saturation Voltage DC Current Gain UVLO Section Turn on Threshold Voltage Turn off Threshold Voltage Discharge Voltage Standby Current Section Start-up Current Operating Current VCC Zener Voltage Dynamic Impedance Internal Oscillator Section Switching Frequency Frequency Dithering Temperature Stability Driver and Output Section OUT Turn on Voltage OUT Turn off Voltage Rise Time Fall Time Maximum Duty Cycle Minimum Duty Cycle Driver OUT On-Resistance Switch Off Current Effective Current Limit ILIM ROUT VOUT(on) VOUT(off) tR tF DMAX CL=1nF, 15 pull-up CL=1nF, 15 pull-up VCC(off) + 0.2V VCC=VCC(on) - 0.2V IOUT=0.7A Driver off, VOUT=10V VCC=VCC(off) + 0.5V 680 68 4.8 8.5 6 60 ns 30 75 3 2.5 20 800 4 40 920 A mA 82 % 11 7.2 V V -40 to 85oC fSW 55 60 70 kHz % IST ICC(op) VZ RVCC ICC=5mA VCC = 3.8Vto 4.8V 6.5 18 26 VCC = 4V 0.22 0.45 0.4 0.7 V k mA VCC(on) VCC(off) VDIS 5.00 3.37 2.7 5.25 3.55 2.9 5.50 3.73 3.1 V V V VCES VCE, SAT hFE VBE=0, ICE=100A IC=0.5A, IB=0.1A IC=0.5A, VCE=2V 13 18 700 0.3 30 V V Symbol Conditions Min Typ Max Unit AP3902 2 3.5 5 5 10 Sep. 2008 Rev. 1.0 5 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Thermal Impedance Parameter Junction to Ambient Junction to Case Symbol RJA RJC Value 60 o AP3902 Unit C/W 30 Typical Performance Characteristics 400 500 480 350 460 Operating Current (A) Start-up Current (A) 440 420 400 380 360 340 300 250 200 150 320 100 -40 -20 0 20 40 60 o 80 100 120 300 -40 -20 0 20 40 o 60 80 100 Ambient Temperature ( C) Ambient Temperature ( C) Figure 4. Start-up Current vs. Ambient Temperature Figure 5. Operating Current vs. Ambient Temperature 70 69 68 67 Switching Frequency (kHz) 66 65 64 63 62 61 60 59 58 57 56 55 -40 -20 0 20 40 o 60 80 100 Ambient Temperature ( C) Figure 6. Switching Frequency vs. Ambient Temperature Sep. 2008 Rev. 1.0 6 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Typical Application R1 C1 + D1-D4 D7 D5 R3 R8 R5 R13 U3 C7 VS VA D6 R6 + C4 B GND C6 R7 C5 C R14 U2 R15 R16 T1 J2 12V/0.85A L2 C2 + R4 C3 C11 C10 R11 D8 + L3 C8 C9 + Z2 Zener AP3902 J1 AC 85264V VCC U1 AP3902 Figure 7. 12V/0.85A Off-Line Adapter Application Circuit Part Type Resistor, NTC Resistor, 5 Resistor, 2 M, 1206 Resistor, 68 k , 1206 Resistor, 3 , 1206 Resistor, 240, 0805 Resistor, 2k, 0805 Resistor, 5.1 M Resistor, 15 , 1206 Resistor, 200, 0805 Resistor, 12k, 0805 Resistor, 4.7k, 0805 Resistor, 3.1k, 0805 Diode, 1N4007, DO-41 Diode, 1N4148 Diode, FR107, DO-15 Diode, 3100, DO-201 Designator R1 R3 R4 R5 R6 R7 R8 R11 R13 R14 R15 R16 D1 to D4 D5, D6 D7 D8 Part Type Capacitor, 10F/400V Capacitor, 2200pF Capacitor, 10F Capacitor, 22nF, 0805 Capacitor, 0.47F, 0805 Electrolytic Capacitor, 1000F Electrolytic Capacitor, 220F Y Capacitor, 2200pF Capacitor, 1nF, 0805 AP3902, DIP-8 AZ431, TO-92 Opto-Coupler, PC817, DIP-4 Inductor, 300H/0.3A Inductor, 10H/1A Transformer, EE-20 Zener, 13V/1W Designator C1, C2 C3 C4, C5 C6 C7 C8 C9 C10 C11 U1 U2 U3 L2 L3 T1 Z2 Sep. 2008 Rev. 1.0 7 BCD Semiconductor Manufacturing Limited Data Sheet LOW POWER PWM SWITCH FOR OFF-LINE SMPS Mechanical Dimensions DIP-8 Unit: mm(inch) AP3902 0.700(0.028) 7.620(0.300)TYP 1.524(0.060) TYP 6 6 5 3.710(0.146) 4.310(0.170) 4 3.200(0.126) 3.600(0.142) 4 3.000(0.118) 3.600(0.142) 0.510(0.020)MIN 0.254(0.010)TYP 0.360(0.014) 0.560(0.022) 2.540(0.100) TYP 0.130(0.005)MIN 0.204(0.008) 0.360(0.014) 8.200(0.323) 9.400(0.370) R0.750(0.030) 3.000(0.118) Depth 0.100(0.004) 0.200(0.008) 9.000(0.354) 9.400(0.370) 6.200(0.244) 6.600(0.260) Sep. 2008 Rev. 1.0 8 BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE - Headquarters BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited - Wafer Fab No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China Shanghai SIM-BCD Semiconductor Manufacturing Limited Tel: +86-21-24162266, Fax: +86-21-24162277 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 REGIONAL SALES OFFICE Shenzhen Office REGIONAL SALES OFFICE - Wafer Fab BCD Semiconductor Manufacturing Limited Shanghai Design Group - IC SIM-BCD Semiconductor Manufacturing Co., Ltd. 800 Yi Shan Road, Shanghai 200233, China Corporation Advanced Analog Circuits (Shanghai) Tel: +86-21-6485 900, Yi Shan Road, Shanghai 200233, China 8F, Zone B, 1491, Fax: +86-21-5450 0008 Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 USA Office BCD Semiconductor Corp. USA Office 30920 Huntwood Ave. Hayward, BCD Semiconductor Corporation CA 94544, USA 30920 Huntwood Ave. Hayward, Tel 94544, U.S.A CA : +1-510-324-2988 Fax: +1-510-324-2788 Tel : +1-510-324-2988 Fax: +1-510-324-2788 Taiwan Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office BCD Taiwan Office (Taiwan) Company Limited Semiconductor Shenzhen Office Room E, SIM-BCD Semiconductor 3rd Fuzhong Road, Futian District, Shenzhen, 4F, 298-1, Rui Guang Road,(Taiwan) Company Limited Shanghai 5F, Noble Center, No.1006,Manufacturing Co., Ltd. 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