DN06010/D Design Note – DN06010/D 200 W, Single Output Power Supply Device NCP1217 Application Input Voltage Refrigerator 90 to 270 Vac Output Power Topology I/O Isolation 140 W / 200 W pk CCM (Continuous Conduction Mode) Flyback Yes Other Specifications Output Voltage Ripple Nominal Current Max Current Min Current Output 1 Output 2 Output 3 Output 4 14 V 200 mVp-p 10 A 14 A 0A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A PFC (Yes/No) No Minimum Efficiency 80% Operating Temp Range 0 to +70˚C Circuit Description Key Features This 14 Vout, off-line power supply was originally designed for refrigeration control applications but can be user tailored to accommodate most 12 to 15 volt applications requiring 140 watts output continuous with a 200 watt peak capability. The converter circuit is designed around a continuous conduction mode (CCM) flyback topology to minimize the inverter’s peak-toaverage current ratio. Slope compensation for D > 50% is achieved with the unique internal architecture of the NCP1217 controller and the value of resistor R9. The 100 kHz flyback transformer is designed with a compact PQ3230 ferrite core. Voltage feedback and regulation is implemented with a simple TL431 programmable reference and optocoupler. • • • • • • August 2006, Rev. 0 CCM operation for low peak to average current ratio. Output ripple reduction inductor (L3) Dual common mode EMI filter for low conducted EMI. Very low standby input current at no load (< 1 watt). Simple, low cost yet highly effective converter circuit. Overcurrent and overvoltage protection. www.onsemi.com 1 DN06010/D Schematic F1 5A AC in 0.33uf "X2" C1 L2 L1 TH1 C3 C4 chassis ground 11 MUR160 1N5245B (15V) D4 C16 47uf 25V 10nf C17 R8 22K R5 R9 2.4K 5 C10 C11 0.1uf 2,200uf 16V 7 10 R11 2K SFH6156A-4 or H11A817A U2 2 3 4 C9 8 8 1 + 14 V, 10 A output _ NCP1217 (100 kHz) U1 C8 2,200uf 16V x 3 4,5,6 1N4148A 6 L3 10 C7 D3 R7 150 D2 MBR20100 R4 0.15, 2W R3 4.7 R6 4.7K, 0.5W 1,2,3 4.7uH Q1 SPP20N60S5 (Infineon) 2.2nf "Y2" x2 Gnd T1 12 D1 C5 390uF 400Vdc R1 1.0M 1/2W T 10 ohm 4A, NTC R2 33K 5W BD1 6A 600V 0.33uf "X2" C2 10nf 500V C6 C15 C14 C13 0.1 100pf 1nf R10 1K Opto R12 1K U3 TL431 Notes: R13 15K C12 0.1uf R14 3.3K 1. Crossed schematic lines are not connected. 2. R4 sets current limit point; R9 sets slope compensation; R13 sets output voltage. 3. D4 sets OVP to 15V on Vcc rail (nominally 10 - 12Vdc) 4. Q1 and D2 will need heatsinks; Aavid #529802B02100 or similar 5 Small heatsink or plate recommended for BD1 6. L1 is Coilcraft CMT1-2.1-4L; L2 is Coilcraft F5593-A; L3 is Coilcraft PV-0-472-20L 7. TH1 is NTC thermistor for inrush limiting (Ametherm or equivalent). 8. Output caps C7, 8, 9, 10 should have low ESR with high ripple current rating. August 2006, Rev. 0 www.onsemi.com 2 DN06010/D MAGNETICS DESIGN DATA SHEET Project / Customer: 14 Vout, 200 Wpk power supply Part Description: 100 kHz flyback transformer, 14 Vout Schematic ID: T1 Core Type: PQ3230 (Ae = 1.6) Core Gap: Gap center leg approximately 1 mm for L = 300 uH Inductance: 300 uH +/-10% (measured from pins 10 to 12) Bobbin Type: Vertical 12 pin pcb mount Windings (in order): Winding # / type Turns / Material / Gauge / Insulation Data "A" Primary (12 - 11) 20 turns of 2 strands of #26HN over one layer; Self-leads to pins; insulate for 2.7 kV to next layer. Vcc/Aux (8 - 7) 5 turns sprial wound over the center 12.5mm with 3mm end margins. Insulate for 2.7 kV to next layer. 14 V Secondary (4,5,6 - 1,2,3) 6 turns of #17 equivalent Litz wire (or 8 strands of #26HN twisted) over the center 12.5mm with 3mm end margins. Insulate with tape for 2.7 kV to next winding. "B" Primary (11 - 10) Same as "A" primary. Insulate with tape. Hipot: 2.7 kV primary/aux to 14V secondary. Vacuum varnish. Lead Breakout / Pinout Schematic Bottom (pin side) view 12 Pri A 11 Pri B 10 Aux 7 1 2 3 12 11 10 9 8 7 14V 4 Sec 5 6 8 1 2 3 4 5 6 1 1 © 2006 ON Semiconductor. Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its products at any time, without notice. Design created by Frank Cathell, E-mail: [email protected] August 2006, Rev. 0 www.onsemi.com 3