EVBUM2143 - Non-isolated Positive Output Buck AC/DC
Contents
1. such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website www onsemi com Literature Distribution Center for ON Semiconductor USA Canada P O Box 5163 Denver Colorado 80217 USA Europe Middle East and Africa Technical Support Order Literature http www onsemi com orderlit Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Phone 421 33 790 2910 f Fax 303 675 2176 or 800 344 3867 Toll Free USA Canada Japan Customer Focus Center For additional information please contact your local Email orderlit onsemi com Phone 81 3 5817 1050 Sales Representative www BDTIC com ON2. NCP1014STBUCGEVB Non isolated Positive Output Buck AC DC Converter Evaluation Board User s Manual Figure 1 Evaluation Board Photo This manual describes the way how to easily design the simple non isolated AC DC converter for powering low voltage control part of mains applications with triac or SCR power switch Some examples are dishwashers microwave ovens coffee machines night illumination and so on In comparison with resistive or capacitive dropper is this solution more comfortable and features some advantages such as e Wide Input Voltage Range 85 VAC 265 VAC Smaller Size Lower Weight Lower Total Cost Good Line and Load Regulation No Need of Additional Linear Regulators e Efficient Design with Up to 80 Efficiency ON Semiconductor http onsemi com EVAL BOARD USER S MANUAL Overload Short Circuit and Thermal Protected Simple for Low Cost Mass Production Universal Design for Wide Range of Output Currents and Voltages The monolithic power switcher used in this application greatly simplifies the total design and reduces time to production The new line of the Power Switchers NCP1010 through NCP1014 is ideal for this purpose This IC in the SOT 223 package reduces size and is suitable for mass production The design consists of input filter rectifier with filtering capacitor power stage with switcher and inductor output ultrafast rectifier output filtering capacitor fe
3. e primary side www BDF t ctom ON NCP1014STBUCGEVB BILL OF MATERIAL Table 3 NCP1014STBUCGEVB EVALUATION BOARD BILL OF MATERIALS Toler ance 10 Through Vishay Hole CMS Capacitor 1 nF 10 1206 AVX Input Terminal LP7 5 2 903 2 LP7 5 2 WeidMuller Block PM5 08 2 WeidMuller SMA ON Semiconductor Axial ON Lead Semiconductor 20 Through Panasonic Hole 20 Through Panasonic Hole 20 Through Rubycon Hole DIL 4 Sharp SOT 223 ON Semiconductor 10 RFB0810 Coil Craft 10 Through Fastron Hole Through Avago Hole 1 1206 Vishay 5 SOD 123 ON Semiconductor Substi Manufacturer Part tution Number Allowed Description Value 3 oo NO N Capacitor X2 100 nF F1772 410 2030 N 12065C102KAT2A LP7 5 2 903 2 OR Output Terminal PM5 08 2 90 PM5 08 2 90 Block _ Ultrafast Power MURA160 MURA160T3G Rectifier 1 A 1000 V Standard Rectifier 1N4007 1N4007RLG Electrolytic 10 uF 400 V ECA2GHG100 Capacitor 220 uF 25V Electrolytic ECA1EHG221 Capacitor 47 uF 25V Electrolytic 25ML47M6 3X5 Capacitor Opto Coupler PC817 PC817X1JOOOF Monolithic Power NCP1014 NCP1014ST65T3G Switcher L Inductor 1 5 mH RFB0810 152 Yes Inductor 1mH 1 6A SMCC R10X YY Yes LED Green LED 5mm HLMP HM57 SV000 Yes CMS Resistor 1 kQ RCA12061KOOFKEA Yes 2 Zener Diode 11V MMSZ11T1G JI ON Semiconductor and ON are registered trademarks of Semiconduc
4. edback loop with zener diode and optocoupler and indicating LED The only component necessary for proper powering of the IC is the Vcc capacitor The IC is directly powered from the HV Drain circuit via internal voltage regulator To eliminate the noise at the feedback input some small ceramic capacitor with value of around 1 0 nF is necessary to be connected as close to the FB pin as possible SCHEMATIC DIAGRAM C1 100 nF 10 uF 400 V CON2 ARK750 2 lO2 D2 1N4007 E3 47 wF 25 V NCP1014ST E2 220 uF 25 V R1 D1 1k MUR160 i O on ARK500 2 iD LD1 GRN ZD1 lO1 11V PC817 C2 1 nF Figure 2 Complete Schematic Diagram of the 12 V 0 2 A Converter aeee WWW B D TTC com ON asm October 2012 Rev EVBUM2143 D NCP1014STBUCGEVB SELECTION OF CRITICAL COMPONENTS Inductor selection For the selected output power need to be selected certain minimum value of the inductance This value is dependent on the mode of operation Reduced value results in Discontinuous Conduction Mode of operation DCM Practically was found that the borderline between Continuous Conduction Mode of operation CCM and DCM is commonly set slightly below maximum output power The result is low cost of the inductor freewheeling diode tr gt 35 ns higher efficiency and lower cost The negative result is in lower output power and higher cost of the NCP101x Power Switcher The current ripple in the induct
5. or during the Ton time may be expressed by Equation 1 V min Vds 2 eq 1 Lmin Alripple Ton Ton Where Ton ON Time Internal Power Switch in ON Vmin Minimum Rectified Input Voltage Vas Drain to Source Voltage Drop Vo Output Voltage Lmin Minimum Inductor Value The current ripple in the inductor during the Toff time may be expressed by Equation 2 Vo eq 2 Alripple Toff Toff min Toff OFF Time Internal Power Switch in OFF The current through the inductor at the beginning of the Ton time is shown by Equation 3 linit Iset Alripple eq 3 Iset Peak Switching Current Set by the FB Loop The average current through the inductor over one switching cycle can be expressed by Equation 4 Alripple Alripple lc fop min PP Ton PP i Tot eq 4 2 linit 2 linit I Inductor Operating Current fop min Minimum Operating Frequency The theoretical minimum inductor value corresponds to Equation 5 2 Vo lo Vmin Vds VO Lmin a eq 5 Alripple fop_min V min Vds Io Output DC Current The theoretical maximum output power will be shown in Equation 6 Pout_max Lmin Iset linit fop_min V min Vds k min ET 2 The current ripple in the inductor during the normal operation will be shown in Equation 7 V min Vds VO Vo Alripple cc eq 7 i V min Vds fop_min Lmin e
6. q 6 The output current will be shown in Equation 8 lset linit Ton Iset linit Toff 2 eq 8 lO fop_min Table 1 TABLE OF PRESELECTED INDUCTORS Vmin 120 V Vas 9 V Vo 12 V Iset 0 405 A fop min 59 kHz Inductance Coilcraft Part Number Alripple Output Current uH see appendix for address A A RFB0810 471 NOTE The output current is the theoretical value and need to be multiplied by the efficiency 0 7 www BD t ctom ON NCP1014STBUCGEVB Freewheeling diode selection The freewheeling diode needs to be selected accordingly to the mode of operation For the CCM operation needs to be used the ultra fast diode with tr lt 35 ns For the DCM operation the standard ultra fast diode with tyr lt 75 ns is enough Table 2 TABLE OF PRESELECTED FREEWHEELING DIODES Fi IF Av trr Part number BE Package MURO 60 AxialLead Lead Electrical Specification of the example at Figure 2 Input 85 VAC 265 VAC Output 12 V 200 mA NOTE The polarity is proportional to common line COMPONENT LAYOUT coun NCP1 1xST Buck ON Semiconductor 1Qu 48QU JO zZ X O O NZ 47u 250 85 26 5VUAC a Figure 3 Component Layout Top Side O NCP1014ST MURISE 0 o O o o O O O o O 1k o oO 14207 oO O 10 O 9 of o Figure 4 Component Layout Bottom Side PCB LAYOUT e AC Input af Figu
7. re 5 PCB Layout www BD PTt e tom ON NCP1014STBUCGEVB EMI TEST RESULTS 90 EN50081 1 Domestic Conducted Emissions Test Conditions Input 230 VAC a Output 11 7 VDC 70 Load Resistive 68 R EN 50081 1 Conducted Quasi Peak dBuV Dom 60 50 40 30 20 Level duv 100K 500K 1M 5M 10M 30M Frequency Hz Figure 6 Conducted EMI TEST PROCEDURE Necessary Equipment 1 DC Volt Meter able to measure up to 20 V DC e g 1 Current limited 90 265 Vrms AC source current KEITHLEY 2000 limited to avoid board destruction in case of a defective 1 DC Amp Meter able to measure up to 500 mA DC part or a 380 VDC source e g AGILENT 681x e g KEITHLEY 2000 1 AC Volt Meter able to measure up to 300 V AC e g e 1 DC Electronic Load e g AGILENT 6060B KEITHLEY 2000 1 AC Amp Meter able to measure up to 1 A AC e g KEITHLEY 2000 NCP1 1xST Buck ON Semiconductor 1Qu 7400VU i 470 250 85 265VAC Figure 7 Test Setup 2 ARK25 S Z O o H O T T O A REGULATED AC SUPPLY Test Procedure Power down the load Connect the test setup as shown in Figure 7 e Power down Uin e Apply an input voltage Uin 90 265 Vac End of test e Apply Iout load 0 A e Check that Uout is 12 Vdc NOTE Be careful when manipulating the boards in Increase Iout load load to 12 V 200 mA operation lethal voltages UAE NaC Check that Uout is 12 V present on th
8. tor Components Industries LLC SCILLC SCILLC owns the rights to a number of patents trademarks copyrights trade secrets and other intellectual property A listing of SCILLC s product patent coverage may be accessed at www onsemi com site pdf Patent Marking pdf SCILLC reserves the right to make changes without further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation special consequential or incidental damages Typical parameters which may be provided in SCILLC data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any
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