AP3968DMTR-G1

Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS General Description Features The AP3968D consists of a primary side regulation controller and a high voltage transistor, and is specially designed for off-line power supplies within 4W output power. Typical applications include adapter for ADSL and auxiliary supplies. • • • • The AP3968D operates at pulse frequency modulation (PFM), and provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and secondary control circuitry. It has internal cable compensation function for tight constant voltage regulation. • • • • The AP3968D solution has fewer component numbers, smaller size, and lower total cost. AP3968D Primary Side Control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry Built-in NPN Transistor with 700VCBO Low Start-up Current: 0.2μA (Typ.) Internal Output Cable Voltage Drop Compensation Random Frequency Modulation for Low EMI Short Circuit Protection Low Total Cost Solution Output Power Range: For 4W Adapter Applications • • • • • • The AP3968D is packaged in SOIC-7. Chargers Adapters Set Top Boxes Auxiliary Supplies DVD LED Driver SOIC-7 Figure 1. Package Type of AP3968D Nov. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Pin Configuration M Package (SOIC-7) CPC 1 7 GND FB 2 VCC 3 6 C CS 4 5 C Figure 2. Pin Configuration of AP3968D (Top View) Pin Description Pin Number Pin Name Function 1 CPC This pin connects a capacitor to GND for output cable compensation 2 FB 3 VCC 4 CS Current sense for primary side of transformer 5, 6 C This pin is connected with an internal power BJT’s collector 7 GND Nov. 2012 The voltage feedback from auxiliary winding This pin receives rectified voltage from the auxiliary winding of the transformer This pin is the signal reference ground Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Functional Block Diagram Figure 3. Functional Block Diagram of AP3968D Nov. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Ordering Information AP3968D - Circuit Type G1: Green Package M: SOIC-7 TR: Tape & Reel Package Temperature Range Part Number Marking ID Packing Type SOIC-7 -40 to 85°C AP3968DMTR-G1 3968DM-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Nov. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Supply Voltage VCC -0.3 to 22 V FB Input Voltage VFB -1 to 10 V Collector-emitter Voltage VCBO 700 V 0.8 A TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10 sec) TLEAD 300 ºC ESD (Machine Model) 200 V ESD (Human Body Model) 2000 V Collector DC Current Operating Junction Temperature 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. Recommended Operating Conditions Parameter Symbol Supply Voltage VCC Operating Temperature Range TOP Maximum Operating Frequency fMAX Nov. 2012 Min -40 Rev. 1. 0 Max Unit 22 V 85 °C 60 kHz BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Electrical Characteristics VCC =15V, TJ=25°C, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit 13 15 17 V 4.5 5.3 6.3 V 0.2 0.6 320 435 550 1.5 3.5 5.5 μA 4.214 4.278 4.342 V 0.3 V 60 nA UVLO Section Turn-on Voltage VON Turn-off Voltage VOFF No drive Current Standby Current Section Start-up Current IST Operating Current ICC VCC=VON-0.5V μA Feedback Input Section FB Input Current FB Threshold Voltage IFB VFB=4V VFB Power Transistor Section Collector-emitter Saturation Voltage VCE (SAT) DC Current Gain hFE Leakage Current ICEO IC=200mA 15 23 Over Temperature Protection Shutdown Temperature TSHDN Surface temperature 125 Temperature Hysteresis 160 ºC 40 ºC Thermal Impedance Parameter Symbol Value Junction to Ambient θJA 80 Junction to Case θJC 40 Nov. 2012 Rev. 1. 0 Unit ºC/W BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Typical Performance Characteristics 17.0 6.5 16.5 6.0 Turn-off Voltage (V) Turn-on Voltage (V) 16.0 15.5 15.0 14.5 5.5 5.0 4.5 4.0 14.0 3.5 13.5 13.0 -40 -20 0 20 40 60 80 100 3.0 -40 120 125 -20 0 20 40 60 80 100 120 125 o o Ambient Temperature ( C) Ambient Temperature ( C) Figure 5. Turn-off Voltage vs. Ambient Temperature Figure 4. Turn-on Voltage vs. Ambient Temperature 600 Operating Current (μA) 550 500 450 400 350 300 -40 -20 0 20 40 60 80 100 120 125 o Ambient Temperature ( C) Figure 6. Operating Current vs. Ambient Temperature Nov. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Operation Description Vs + vIN C1 LM Np Ns D1 CO VO + Iout AP3968D VAUX C NAUX Q1 RFB1 CS GND CPC FB RFB2 RCS CCPC Figure 7. Simplified Flyback Converter Controlled by AP3968D Figure 7 illustrates a simplified flyback converter controlled by AP3968D. Ipk = Constant Primary Peak Current The primary current Ip(t) is sensed by a current sense resistor RCS as shown in Figure 7. The energy stored in the magnetizing inductance LM each cycle is therefore: The current rises up linearly at a rate of: Eg = dip( t ) vg( t ) …………(1) = dt LM So the power transferring from input to output is given by: P= 1 ⋅ L M ⋅ Ipk 2 …………(3) 2 1 ⋅ L M ⋅ Ipk 2 ⋅ f SW …………(4) 2 Where fSW is the switching frequency. When the peak current Ipk is constant, the output power depends on the switching frequency fSW. Figure 8. Primary Current Waveform Constant Voltage Operation The AP3968D captures the auxiliary winding feedback voltage at FB pin and operates in constant-voltage (CV) mode to regulate the output As illustrated in Figure 8, when the current Ip(t) rises up to Ipk, the switch Q1 turns off. The constant peak current is given by: Nov. 2012 Vcs …………(2) Rcs Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS charging the built-in capacitance connected. This fixed proportion is: voltage. Assuming the secondary winding is master, the auxiliary winding is slave during the D1 on-time. The auxiliary voltage is given by: VAUX AP3968D Tons 4 = ………… (6) Toffs 3 N = AUX ⋅ (Vo + Vd ) …………(5) NS The relation between the output constant-current and secondary peak current Ipks is given by: Where Vd is the diode forward drop voltage, NAUX is the turns of auxiliary winding, and NS is the turns of secondary winding. 1 Tons …………(7) Iout = ⋅ Ipks ⋅ 2 Tons + Toffs At the instant of D1 turn-on, the primary current transfers to the secondary at an amplitude of: Ipks = NP ⋅ Ipk …………(8) NS Thus the output constant current is given by: 2 N Iout = ⋅ P ⋅ Ipk …………(9) 7 NS Figure 9. Auxiliary Voltage Waveform The output voltage is different from the secondary voltage in a diode forward drop voltage Vd which depends on the current. If the secondary voltage is always detected at a constant secondary current, the difference between the output voltage and the secondary voltage will be a fixed Vd. The voltage detection point is portion of Tons after D1 is turned on. The CV loop control function of AP3968D then generates a D1 off-time to regulate the output voltage. Leading Edge Blanking (LEB) When the power switch is turned on, a turn-on spike on the output pulse rising edge will occur on the sense-resistor. To avoid false termination of the switching pulse, a typical 500ns leading edge blanking is built in. During this blanking period, the current sense comparator is disabled and the gate driver can not be switched off. The built-in LEB in AP3968D has shorter delay time from current sense terminal to output pulse than those IC solutions adopting external RC filter as LEB. Constant Current Operation The AP3968D is designed to work in constant current (CC) mode. Figure 10 shows the secondary current waveforms. Built-in Cable Compensation The AP3968D has built-in fixed voltage of 0.35V typical to compensate the drop of output cable when the load is changed from zero to full load. A typical 0.01μF external capacitor connected to the CPC pin is used to smooth voltage signal for cable compensation. Over Temperature Protection The AP3968D has internal thermal sensing circuit to shut down the PFM driver output when the die temperature reaches 160ºC typical. When the die temperature drops about 40ºC, the IC will recover automatically to normal operation. Figure 10. Secondary Current Waveform In CC operation, the CC loop control function of AP3968D will keep a fixed proportion between D1 on-time Tons and D1 off-time Toffs by discharging or Nov. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Typical Application Figure 11. Typical Application of AP3968D (5V/700mA) Item Description QTY Item Description QTY 1 R1 11Ω, 2W 1 1 R3 3.3MΩ/0.25W 1 1 1 1 1 1 2 6 1 R5 R6 R7 R8 R9 R10 R11 R12 1 1 1 1 1 1 1 1 Bead, 0805 1 T1 3.9Ω , 0805 150kΩ, 1206 1.3Ω, 1206 20kΩ, 0805 13kΩ, 0805 200Ω, 0805 27Ω, 0805 1.2kΩ, 0805 EE13 core, PC40, transformer AP3968D 1 C3 C5 C8 C11 C12 D1 to D6 D12 L1 10.0μF/400V, electrolytic 4.7μF/400V, electrolytic 3.3μF/50V, electrolytic 1nF/1kV, ceramic 0.01μF, 0805 1nF, 0805 470μF/10V 1N4007, rectifier diode APD260 470μH, inductor L2 U1 C1 C2 Nov. 2012 Rev. 1. 0 1 BCD Semiconductor Manufacturing Limited 10 Preliminary Datasheet Primary Side Power Switcher for Off-line SMPS AP3968D Mechanical Dimensions SOIC-7 Unit: mm(inch) 5.800(0.228) 1.350(0.053) 1.750(0.069) 6.200(0.244) 0.330(0.013) 0.510(0.020) 2.54(0.100) TYP 4.700(0.185) 5.100(0.201) 1.270(0.050) TYP 0.100(0.004) 0.250(0.010) 3.800(0.150) 4.000(0.157) 0.190(0.007) 0.250(0.010) 0° 8° 1.250(0.049) 1.500(0.059) 0.450(0.017) 0.800(0.031) Note: Eject hole, oriented hole and mold mark is optional. 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