This application note describes easily design simple, non-isolated AC/

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AND8190/D Non-isolated Negative Output Buck AC/DC Converter
This application note describes easily design simple, non-isolated AC/DC converter powering voltage control portion line-powered applications that triac power switch. Examples such applications include dishwashers, microwave ovens, coffee machines, illumination, etc. Compared passive solutions using resistors capacitors reduce voltage, this design significant advantages such Wide input voltage range Smaller size, lower weight, lower total cost Good line load regulation, need additional linear regulators Efficient design with efficiency Overload, short circuit thermal protection Convenient mass production devices Universal design wide range output currents voltages
monolithic power switcher used this application greatly simplifies total design reduces time production. Semiconductor's NCP1010 1014 family, line Power Switchers, ideal this purpose. NCP101x offered SOT-223 package reduced size, suitable mass production. design consists input filter, rectifier with filtering capacitor, power stage with switcher inductor, output ultrafast rectifier, output filtering capacitor, feedback loop with Zener diode optocoupler, indicator LED. only component necessary proper powering capacitor, since directly powered from Drain circuit internal voltage regulator. eliminate noise feedback input, small ceramic capacitor around should connected close possible.
mF/25
CON2 ARK750/2
mF/400
MUR160
CON2 ARK500/2
1N4007 mF/25
NCP1014ST
PC817
Figure Complete Schematic Diagram V/0.2 Converter
Semiconductor Components Industries, LLC, 2004
December, 2004 Rev.
Publication Order Number: AND8190/D
AND8190/D
SELECTION CRITICAL COMPONENTS
Inductor Selection
desired output power determines minimum value inductance. This value dependent mode operation. reduced inductor value results Discontinuous Conduction Mode operation (DCM). practice, switch-over point between Continuous Conduction Mode operation (CCM) commonly slightly below maximum output power. This achieves reasonable compromise between inductor size ripple current, efficiency, overall lower cost. only significant negative aspect this particular operating mode higher peak-to-average current ratio inverter circuit. current ripple inductor during time expressed equation
DIripple(Ton)
current through inductor beginning time
Iinit Iset DIripple
Iset Peak switching current loop. average current through inductor over switching cycle expressed equation
fop_min DIripple Iinit
DIripple Iinit Toff
Inductor operating current fop_min Minimum operating frequency. theoretical minimum inductor value given expression
Vo)) (DIripple2 fop_min Vds))
time, internal power switch Vmin Minimum rectified input voltage Drain-to-Source voltage drop Output voltage Lmin Minimum inductor value. current ripple inductor during Toff time expressed equation
DIripple(Toff) Toff
Output current. theoretical maximum output power will
Pout_max (Iset2 Iinit2) fop_min
*Vds) *Vds*Vo)
current ripple inductor during normal operation will
DIripple Vds) fop_min min)
Toff time, internal power switch off.
output current will
fop_min ((Iset Iinit) (Iset Iinit) Toff)
Table Preselected Inductors (Vmin Iset 0.405 fop_min kHz)
Inductance (mH) 1000 1500 Coilcraft Part Number (see appendix address) RFB0810-471 RFB0810-681 RFB0810-821 RFB0810-102 RFB0810-152 DIripple 0.39 0.27 0.22 0.18 0.12 Output Current 0.25 0.32 0.34 0.36 0.40
output current theoretical value must multiplied efficiency 0.7).
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AND8190/D
Freewheeling Diode Selection
freewheeling diode needs selected according mode operation. operation ultra-fast
Table Preselected Freewheeling Diodes
Part number MUR160 MURA160T3 MURS160T3 MURS260T3 VRRM
diode with reverse recovery time must used. operation standard ultra-fast diode with adequate.
IF(AV)
(ns)
Package Axial Lead
Electrical Specification Example Figure
Input: Output: Note: polarity relative common line.
COMPONENT LAYOUT
Figure Component Layout Side
Figure Component Layout Bottom Side
LAYOUT
Figure Layout
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AND8190/D
Test Results: Test Conditions:
Input: Output: 11.7 Load: Resistive
Figure Conducted Contact Address Inductor Manufacturer: Coilcraft
1102 Silver Lake Road, Cary 60013 800-322-2645 847-639-6400 847-639-1469 Napier Place Wardpark North, Cumbernauld Scotland Telephone (Int) (0)1236 730595 (sales) (0)1236 730627 www.coilcraft.com
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. This literature subject applicable copyright laws resale manner.
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AND8190/D

This application note describes easily design simple, non-isolated AC/

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