This application note uses standard NCP1012 evaluation board, referenc

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AND8132/D Performance Improvements NCP1012 Evaluation Board
This application note uses standard NCP1012 evaluation board, referenced NCP1010-1014 data sheet. board includes only core components needed demonstrate operation NCP101x;
1N4007 1N4007 m/400 2n2/Y
application note describes modifications basic circuit reduce standby power consumption, increase efficiency, reduce EMI.
U160
B150 m/25
CEE7.5/2
CZM5/2
NCP1012 PC817
1N4007 m/63 1N4007
2n2/Y
Figure Schematic Diagram Demo Board
Figure Component Placement
Semiconductor Components Industries, LLC, 2003
August, 2003 Rev.
Publication Order Number: AND8132/D
AND8132/D
evaluation board demonstrates NCP1012 SMPS with universal input voltage range VAC-265 VAC) output schematic SMPS shown Figure component placement Figure tested performance unmodified board shown below:
Item (mA) Vout Iout (mA) Pout Efficiency Standby (mW) Test 8.25 11.99 6.24 75.6 638.3 Test 25.1 8.15 12.1 6.29 77.1 695.6
Feedback Stability: regulation tested stability over full input voltage range VAC-265 VAC) with load instability found.
Standby Consumption
Standby power consumption most important parameters SMPS under low- no-load conditions. demo board main sources standby power consumption NCP1012 supply, drain clamp
circuit, feedback loop operating current various transformer losses. these, only feedback loop operating current drain clamp circuit easily modified. feedback loop operating current must calculated properly achieve good voltage stability, adequate dynamic response acceptable noise immunity. simplest case zener type feedback typical operating current 4.0-6.0 This method used demo board, resulting standby consumption VDC. reducing operating current loop, standby consumption reduced, with negative effects noise immunity accuracy. example, when bias resistor removed, operating current standby consumption reduced this case circuit operation still non-burst mode, although voltage stability good there still ripple output. more complicated, more accurate, solution based TLV431 shunt regulator. This regulator operates correctly operating current When used this design, load, high gain, operates burst mode. this mode complete design standby consumption output voltage unstable, with noise ripple, shown Figure Output voltage waveforms both feedback solutions:
Figure Zener Feedback
Figure TLV431 Feedback
There various ways design drain clamp circuit. clamp, used evaluation board, cheapest most widely used. This clamp dissipates peak energy from transformer part transformed energy. peak energy need dissipated, transformed energy not. case demo board this clamp used. With connected consumption input voltage When removed, consumption reduced Another approach (transient voltage suppressor) clamp. Recommended parts include ON's
P6KE200A SA170A, versions both P6SMB200AT3 1SMB170AT3 respectively. This clamp consists high voltage zener diode, with ultrafast rectifier diode series. zener clamp voltage usually around Using this clamp, power consumption significantly reduced. With connected, consumption input voltage versus with disconnected. active clamp allows greater reduction standby power, more expensive than simple clamp.
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AND8132/D
This clamp solution positive results only standby consumption, also efficiency both under normal operation light load conditions. output current input voltage, input power drops from 2.94 with clamp 2.83 with clamp. higher output powers benefit significant. demo board design intended production, improvements performance needed. example, filter necessary basic function SMPS, mandatory real-world design. Figure shows performance basic demo board before modification; conducted emissions input well above maximum allowed EN50081-1. When suppression capacitor added input, magnitude dramatically reduced. result shown Figure This solution usable increased more.
Figure Filter
Figure Capacitor Input
Further improvement results from adding filter between rectifier bridge bulk capacitor shown Figure
1N4007 1N4007 m/400 m/400
layout guidelines followed. Figure shows improvement conducted emissions result adding capacitor coil only; Figure shows result implementing complete filter.
CEE7.5/2
1N4007 1N4007
Figure Complete Filter
With radiation reduced more than dBmV. This design acceptable production good
Figure Coil Capacitor
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AND8132/D
Figure Complete Filter
Bills material used standard versions demo board:
Standard Version
Part 2n2/Y2 2n2/Y2 1N4007 1N4007 1N4007 1N4007 MUR160 MBR150 m/400 m/63 m/25 NCP1012 PC817 CEE7.5/2 CZM5/2 TR-NCP1012 1N5241B DO-41 DO-41 DO-41 DO-41 59-04 59-04 CEE7,5/2 CZM5/2 RM10 RM12,5 RM6,35 RM6,35 EF16 Hor. DO-204AH Arcotronics Arcotronics Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor Panasonic Nippon Nippon Semiconductor Sharp Various Various Vishay Vishay Vishay Vishay Elektronic Semiconductor Value Package Manuf.
Version
Part 2n2/Y2 1N4007 1N4007 1N4007 1N4007 MUR160 MBR150 m/400 m/63 m/25 NCP1012 PC817 CEE7.5/2 CZM5/2 P6KE200A TR-NCP1012 1N5241B DO-41 DO-41 DO-41 DO-41 59-04 59-04 CEE7,5/2 CZM5/2 RM10 SURMETIC RM6,35 RM6,35 EF16 Hor. DO-204AH Arcotronics Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor Panasonic Nippon Nippon Semiconductor Sharp Various Various Vishay Semiconductor Vishay Vishay Elektronic Semiconductor Value Package Manuf.
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AND8132/D
Notes
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AND8132/D
Semiconductor registered trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer.
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AND8132/D

This application note uses standard NCP1012 evaluation board, referenc

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