EVBUM2151 - NCP1605 152 W Forward Evaluation Board User`s
Contents
1. SUA 692 06 N 1 e s z 2H n Av LAYA ad dd vo xv px d L S09LdON in ss 44 09 LAYA n SO9NOZddS I Bi n 1 9uid is 4uozz a guid eo eeu I El gum AA d t t 02 09 an 001 quot au o Ei Y du 089 e eco ed 39 m ZA adAL TS duzz v 19 fil z 4 91 0 9 F 4 4 4008 Jil 022 40081 E 99 gu 00 NV 29 ZA d L 40081 40081 3028 T oc ev au 2i xz 8 5 99A E 99A 219 4 4 AAA 40081 40081 409S ZX d L ZX d L AMGA 6 30081 Juoe Z e APER 15 SLO ANAA 6 su du Hrios XLL 9 Figure 2 1605 Forward Evaluation Board Schematic Stage www BD fTEC com ON NCP1605FORWGEVB SIU qISIA jou Kauj pJeoq y ui pejinoJio oys ABU e uBnoJuj pejoguoo si euo pis uBiu y juo UOISIBA pejueseJd y ui ssejes2. 915 90 Df ar eod M gg 89809 anos ZA GAL XLO 95 duzz duzz 920 120 uonoejep 99A Figure 3 Evaluation Board Schematic 2 Switch Forward Converter www BD fTC com ON co e NCP1605FORWGEVB NCP1605PFC E TLS T xui TPSOND o CL riz T c2 A oe Cis Z ai T U H s RIS ti z 027 VES 22 Dii mt i 25 d IF L M 2 m Lerm QO I LU bi P Hg2 X24 a TPULC ms lL HBI D6 LL 1 L c29 an Semiconductor ein Caution HIGH Voltage gt TPYBULK af 47 Figure 4 PCB Layout Silkscreen Top IT R10 c39 1 L R20 dem c7 jes 1 R22 __ 558 2D R12 Ld Rie
3. VBULK 1 00 V div 19 V 5 V div Chi 100V amp Ch 5 00V 400ms Chi 7 1007 100V amp Chi 5 00 VO Figure 17 Skip Mode Operation of the PFC Stage at 120 Vrms No Load The Skip Mode Period is About 1 5 s V amp Ch2 5 00V M20 0ms Ch3J 100 V V Ch4 5 00 VO Figure 18 Zoom of the Precedent Plot www BD fFf com ON UD 100 100 NCP1605FORWGEVB lour 6 Aidiv 19V 6 Vin 100 V div 2 V sini 3 00 V 5 M ooms CHS 1847 V W Ch4 5 00 VON Figure 19 Skip Mode Operation of the PFC Stage at 230 Vrms No Load 100 100 QV win 590v amp M thi 7 2167 OV Ch4 5 00 VON ail 10 Ch3 10 Figure 20 Zoom of the Precedent Plot www BD fFf com ON NCP1605FORWGEVB Thermal Measurements The following results were obtained using a thermal camera after a 2 5 h operation at 25 C ambient temperature These data are indicative Table 4 PFC Stage Current Sense Power MOSFET Bulk Capacitor Resistor Coil Input Bridge 5 2 Switch Forward Stage Output Diodes Power MOSFETs Transformer Output Capacitor Output Coil MBR20100 90 C Low Side 85 C High Side 75 C 55 C 100 Measurement Conditions Low line 90 Vrms full load 8 Table 5 BILL OF MATERIALS FOR THE NCP1605FORWGEVB EVALUATION BOARD Substi Designat Toler Manufacturer Part tution Lead or Description Value ance Footprint Manufacturer Num
4. an RIT T RST n2 cs RZ3 021 R36 a Rs R50 Aaa LN Cis mn pes Figure 5 PCB Layout Silkscreen Bottom im DP cI Riad www BDTt ctom ON NCP1605FORWGEVB www BDTt ctom ON NCP1605FORWGEVB 19 V CH2 180 5 00 V TO oms Cha 7 200mV chs 100V 8 5 00 19 V Output Voltage CH2 chi rer yx dna V ch F 200mV Ch3 100V 5 4 2 00 VOS Vin RMs 230 V Pin 177 W lout 8 PF 0 976 THD 17 Figure 7 General Behavior Typical Waveforms www BD Ff com ON NCP1605FORWGEVB Table 1 POWER FACTOR AND EFFICIENCY PF Var Emene ox o 2 sr om om s m e rs om sr m s e rz om s m s ee m _ xs om 2 sr e m mr we ws we e r wm se Ce _ m ww _ m a _ m ww _ wm se s sm se 2 At full load the efficiency remains above 83 9 www BD fT com ON NCP1605FORWGEVB Startup Sequencing at 120 Vrms and lour 8 Vin Rectified Line Voltage 100 V div 1007 amp Ch2 5 00V M20 0ms Chi 43 0V Ch3 100V amp Ch4 5 00 Figure 8 Startup Phase at 120 V
5. 148 DO 35 Philips 1N4148 Yes www BDTt com ON NCP1605FORWGEVB Table 5 BILL OF MATERIALS FOR THE NCP1605FORWGEVB EVALUATION BOARD Substi Designat Toler Manufacturer Part tution Lead or Qty Description Value ance Footprint Manufacturer Number Allowed Free D14 1 Schottky Diode 1N5817RLG Axial ON 1N5817RLG No Yes Lead Semiconductor D3 D9 2 16 V Zener 1N5930BRLG Axial ON 1N5930BRLG No Yes Diode Lead Semiconductor D18 D20 2 16 V Zener 1SMA5930BT3G SMA ON 1SMA5930BT3G No Yes Diode Semiconductor D16 1 Zener BZX79 C3V0 DO 35 Philips BZX79 C3V0 Yes Yes Diode D6 D7 2 Dual Schottky MBR20100CT TO220 ON MBR20100CTG No Yes Diode G Semiconductor D12 D13 2 Demagnetization MUR160RLG Axial ON MUR160RLG No Yes Diodes Lead Semiconductor D15 1 Rectifier 1N4934RLG Axial ON 1N4934RLG No Yes Lead Semiconductor HS1_M1 2 Heatsink KL195 25 4SW Fischer SK 104 25 4 STS TO Yes Yes HS3_D6 Elektronik 220 HS1_X31 2 Heatsink KL194 25 4SW Fischer SK 129 25 4 STS TO Yes Yes HS2_X24 Elektronik 220 L1 1 DMT2 26 11L 26 uH power Through CoilCraft DMT2 26 11L No Yes choke Hole M1 1 PFC MOSFET SPP20N60S5 TO220 Infineon SPP20N60S5 Yes Yes Q1 Q2 2 PNP Transistor BC369 TO92 ON BC369ZL1G No Yes Semiconductor 1 1 NPN Transistor BC846B SOT23 ON BC846BDW1T1G No Yes Semiconductor Q5 Q6 3 NPN Transistor BC368 TO92 ON BC368G No Yes Q7 Semic
6. L431CLPG No Yes Reference Semiconductor X24 X31 2 Forward MOS SPP11N60S5 TO220 Infineon SPP11N60S5 Yes Yes FET F1 1 4A Fuse 4A 5x20mm Schurter 0001 1010 Yes Yes J1 1 Intlet IEC Single Intlet Terminal Schurter GSF1 1002 41 Yes Yes Fused Block GSF1 1202 41 J2 1 Output Terminal PM5 08 2 90 PM5 08 2 WeidMuller 5 08 2 90 Yes Yes Block Test 16 Test Points Terminal PCB 1 02mm Vero 20 2137 Yes Yes Points Black PK100 Insulating 4 Bush TO 220 TO 220 Unbranded MK3306 Yes Kit PK10 Voltage isolation 1 kV www BDTt ctom ON NCP1605FORWGEVB TEST PROCEDURE FOR THE NCP1605 FORWARD EVALUATION BOARD Test Procedure 1 Apply a resistive or an active load across the output between the Vour and terminals of the board This load must be able to draw 12 A from 19 V use a 25 V or more voltage load for a safe headroom To evaluate the board performance it is recommended to place a power analyzer able to measure The power delivered by the power source Pin The power factor PF and the Total Harmonic Distortion THD of the current absorbed from the ac power source As portrayed by Figure 21 this power meter should be inserted between the power source and the board the power source being defined in next point Plug the application to a 250 W or more isolated ac power source This source that is applied is supposed to simulate the line utility Hence t
7. NCP1605FORWGEVB NCP1605 152 W Forward Evaluation Board User s Manual Introduction When associated to forward or half bridge converters taking advantage of a narrow input voltage range the PFC stage should be designed to start first and to remain active as long as the power supply is plugged in More specifically the downstream converter turns on and operates while the output of the PFC stage is nominal In other words the PFC must be the master The NCP1605 is a Power Factor Controller especially designed to meet these requirements This driver features a pfcOK pin to enable the downstream converter when the PFC stage is ready for operation Practically it is in high state when the output voltage of the PFC stage is within regulation and low otherwise fault or startup condition In addition the PFC stage having to remain active in light load conditions the NCP1605 integrates the skip cycle capability to lower the standby losses to a minimum For more information on this device please refer to datasheet at http Avww onsemi com PowerSolutions product do id NCP 1605 Application Note AND8281 available at http www onsemi com pub Collateral AND8281 D PDF gives the main dimensioning criteria equations for a NCP1605 driven application For the sake of clarity this process is illustrated in the following practical application AC line range 90 V up to 265 V Output Voltage 19 V 8 A EC61000 3 2 Class D compli
8. ON LITERATURE FULFILLMENT N American Technical Support 800 282 9855 Toll Free 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 zs 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 ON
9. Resistors R25 1 3 W 0 27 For 0827 5 Axial Welwyn W31 R27 JI Yes Yes ward CS Resist Lead or R40 R50 3 1 1 4 W 109 1 1206 Vishay RCA120610KOFKEA Yes Yes R36 Resistors R28 1 1 1 4 W 47 kQ 1 1206 RCA120647KOFKEA Yes Yes Resistors R29 R30 2 196 1 4 W 3 3 kQ 1 1206 Vishay RCA12063K30FKEA Yes Yes Resistors R35 1 100R 4W 100R 4W 5 Axial Tyco SBCHE4 100R Yes Yes Resistor Lead Electronics R11 R43 4 196 1 4 W 1kQ 1 1206 Vishay RCA12061KOOFKEA Yes Yes R55 R57 Resistors R42 1 1 1 4 W 100 Q 1 1206 Vishay RCA1206100RFKEA Yes Yes Resistors R52 1 196 1 4 W 6 8 1 1206 Vishay RCA12066K80FKEA Yes Yes Resistors R1x 1 196 1 4 43 kQ 1 1206 Vishay RCA120643KOFKEA Yes Yes Resistors R56 R45 4 1 1 4 W OR 1 1206 Vishay RCA12060ROOFKEA Yes Yes RO D19 Resistors are replaced by straps D21 D11 2 Yes are replaced by straps T1 1 PFC Coil SICO 977 Through Sicoenergie SICO 977 No Yes Hole T2 1 Forward SICO 978 Through Sicoenergie SICO 978 No Yes Transformer Hole U1 1 Diodes Bridge KBU6K Through General KBU6K Yes Yes Hole Semiconductor U2 1 Forward NCP1217AD13 SOIC 8 ON NCP1217AD133R2G No Yes Controller 3R2G Semiconductor U3 1 PFC Controller NCP1605DR2G SOIC 16 ON NCP1605DR2G No Yes Semiconductor X25 1 01 01 Pulse Q3903 A Through CoilCraft Q3903 A No Yes Transformer Hole X29 1 Opto Coupler SFH6156 2 4 SIOC Vishay SFH6156 2 No Yes X30 1 Voltage TL431CLPG TO92 ON T
10. ant Caution Voltage ka d ON Semiconductor hitp onsemi com EVAL BOARD USER S MANUAL The goal of this user s manual is to give more information on the practical implementation of this application and to present the performance of the solution The power supply consists of two stages A PFC pre converter that provides the main converter with a stable 390 Vdc input voltage The main conversion stage that is a 2 switch forward operating at 133 kHz The 2 switch forward is driven by the NCP1217A Housed in a SOIC 7 or PDIP 7 package the NCP1217A eases the design of modern ac dc adapters and offers a true alternative to UC384X based designs This circuit is ideal for 2 switch forward converters It limits the duty cycle below 5046 and its current mode control topology provides an excellent input audio susceptibility and inherent pulse by pulse control In addition when the current set point falls below a given value e g when the output power demand diminishes the IC automatically enters the so called skip cycle mode and provides high efficiency at light loads Because this occurs at a user adjustable low peak current no acoustic noise takes place For more information please refer to http www onsemi com PowerSolutions product do id N CP1217A ix Figure 1 The Board cM Ww DI L LC COM O N foan October 2012 Rev EVBUM2151 D NCP1605FORWGEVB
11. ation the power supply enters a low duty cycle safe hiccup mode as shown by Figure 11 Figure 12 that zooms Figure 11 shows that the circuit operates over about 130 ms on a 3 s hiccup period 4 duty cycle www BD fft com ON NCP1605FORWGEVB 100 amp M 4 Ch3 100V 5 Ch4 2 00 VQ Figure 11 The Circuit Enters a Safe Low Duty Cycle Hiccup Mode if the 19 V Output is Short Circuited Test Made at 120 Vrms www BD ff com ON NCP1605FORWGEVB 2 00 VOS Figure 12 Zoom of the Precedent Plot More generally this protection triggers when the load current lour is excessive The following thresholds were measured Table 2 m m z 100 D15 R44 1N4934 22 Vaux2 Sov au Auxiliary voltage from the forward BC368 transformer D8 1N4148 When is Vz goes low and Vcc cannot be generated any more The ap Qt n plication enters hiccup mode FB NCP1217A Feedback Voltage Q3 BC368 H R26 c9 Figure 13 Circuit for Overload Protection www BD ff com ON NCP1605FORWGEVB Protection of the PFC Stages The NCP1605 protection features allow the design of very rugged PFC stages The following brownout detection levels were measured the 19 V output being loaded by a5 A current Minimum line RMS voltage to start operation 83 V RMS line voltage being which the system stops o
12. ber Allowed Free Choke Com 2x6 8 mH Through EPCOS B82734 R2322 B30 Yes Mode 3 2A Hole DM Choke WE FI series Through Wurth 7447055 Yes 150 5 Electronik X2 Capacitor 330 nF X2 Through RIFA PHE840MY6330M Yes Hole C2 Bulk Capacitor 100 uF 450 V Through Vishay 222215937101 Yes 105 C Hole C3 CMS Capacitor 4 7 nF 1206 Kemet C1206C472J5GAC Yes C4 CMS Capacitor 390 pF 1206 Kemet C1206C391K5GAC TU Yes C8 C17 CMS Capacitor 220 nF 1206 Kemet C1206F224K5RAC Yes C6 C31 Electrolytic 220 uF 25 V i Through Rubycon 25YXF220MB8X11 5 Yes Capacitor Hole C14 C33 CMS Capacitor 1nF 1206 AVX 12065C102KAT2A Yes C34 C35 C30 C37 C27 Capacitor 470 pF 100 V Through AVX SR211A471JTR Yes Hole C21 C25 X1 Y2 Capacitor 4 7 nF X1 Y2 Through muRata DE2E3KH472MA3B Yes C12 C13 Hole C18 C29 Electrolytic 470 uF 25V Through Nichicon UPM1E471MPD Yes Capacitor Hole C19 C20 CMS Capacitor 1 uF 1206 AVX 1206YC105KAT2A Yes C26 C22 CMS Capacitor 680 nF 1206 Kemet C1206C684K5RAC Yes C5 C23 CMS Capacitor 10 nF 1206 muRata GRM3195C1H103JA01D Yes C28 Electrolytic 100 uF 50 V Through Rubycon 50RX30100MEFG10X12 5 Yes Capacitor Hole C32 Capacitor 100 nF t Through Epcos B37987F1104K Yes Hole C39 CMS Capacitor 100 nF 1206 Kemet C1206F104K1RAC Yes D1 PFC Diode MUR460RLG Through ON MUR460RLG Yes Hole Semiconductor DO 35 Diode 1N4
13. ers due to some noise R42 is chosen small compared to R11 not to modify the threshold since the actual voltage applied to pin 13 is R11 RTI Ra2 cc Voa which is closed to Vcc 16 V if R42 is small compared to R11 and if D3 is properly biased M4 05 2 00 VC Figure 14 Action of the Overcurrent Limitation This Test was Made by Creating an Overload Condition at 90 Vrms www BD ff com ON NCP1605FORWGEVB Dynamic Performance The following plots were obtained by varying Iour from 2 A to 8 A slope 2 A us at 120 Vrms One can note that thanks to the NCP1605 dynamic response enhancer the bulk voltage stays largely above 10 Ch3 100V amp Ch4 OV Ch2 1 00 V amp amp M10 0ms chat 5 00 VON 350 V while the load current suddenly increases from 25 to full load see Figure 16 19 V AC Component 1 V div 4 7 V Figure 15 Abrupt Load Increase at 120 Vrms Another interesting behavior is the absence of overshoot on Vpur when the load current suddenly drops The stage takes benefit from the fast response of the 2 switch forward feedback voltage FB More specifically an abrupt load decrease results in a rapid drop of the FB voltage If this signal that controls the NCP1605 skip mode activity drops to a level that is low enough the PFC stage skips cycles until the bulk voltage reaches 95 5 of its nominal value This skipping period see the VguLK decay period from 381 V do
14. he power source voltage should be a 50 or 60 Hz sinusoid without dc component Its magnitude must remain below 265 Vrms Oscilloscope Isolated current probe 4 You can then measure the board performance presented in ANDxxxx Among them we can list Apply 120 Vrms and load the output with 8 A i The output voltage should be between 18 5 and 19 5 V The power factor should be higher than 0 990 iii The input power should be less than 190 W e Decrease the load current When Iour is below 0 25 A the PFC stage should have entered skip mode You can check it by observing the line current that must be bursting Increase the load current until 19 V output voltage drops The load current should be less than 12 A and the power supply should be hiccupping Again you can check this by observing the line current This test must be very short to avoid any excessive heating of the board designed for 8 A Immediately stop the test if the power supply does not enter hiccup mode while lour is 12 A voltage probes note Isolated ac power source 250 VV 50 or 60 Hz sinusoidal voltage V Power Analyser e g PM1200 2 4 Input 2 socket 2 lt 19 v e Vout 2 Resistive or Electronic Load 2 Vout board Secondary ground Note use as many voltage probes as needed to display the waveforms you want to observe Please note that high voltage one
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16. onductor R1 R3 8 196 1 4 W 1 8 1 1206 232272461805 Yes Yes R9 Resistors R14 R16 R20 R22 R2 1 196 1 4 W 150 Q 1 1206 Vishay RCA1206150RFKEA Yes Yes Resistors R12 R39 2 1 1 4 W 47 Q 1 1206 Vishay RCA120647R0FKEA Yes Yes Resistors R6 1 196 1 4 W 2 4 1 1206 Vishay RCA12062K40FKEA Yes Yes Resistors R7 1 3 W PFC CS OR1 3W 1 Axial Vishay LVR 3 1 196 E70 E3 Yes Yes Resistor Lead R8 1 196 1 4 W 4 7 kQ 1 1206 Vishay RCA12064K70FKEA Yes Yes Resistors R10 R31 5 196 1 4 W 10 1 1206 Vishay RCA120610KOFKEA Yes Yes R37 R38 Resistors R51 R13 R44 2 1 1 4 W 2 2 Q 1 1206 Vishay RCA12062K20FKEA Yes Yes Resistors R15 1 196 1 4 W 62 1 1206 Vishay RCA120662KOFKEA Yes Yes Resistors R17 R21 2 1 1 4 W 27 1 1206 Vishay RCA120627KOFKEA Yes Yes Resistors R49 1 1 1 4 W 6 8 kQ 1 1206 Vishay RCA12066K80FKEA Yes Yes Resistors R18 R27 4 1 1 4 W 22 1 1206 Vishay RCA120622KOFKEA Yes Yes R46 R58 Resistors R23 1 1 1 4 W 820 kQ 1 1206 Vishay RCA1206820KFKEA Yes Yes Resistors www BD fT com ON NCP1605FORWGEVB Table 5 BILL OF MATERIALS FOR THE NCP1605FORWGEVB EVALUATION BOARD Substi Designat Toler Manufacturer Part tution Lead or Qty Description Value ance Footprint Manufacturer Number Allowed Free R24 1 196 1 4 560 1 1206 RCA1206560KFKEA Yes Yes
17. peration 74 V Asshown by Figure 14 the line current is limited to 3 2 A This corresponds to proper expected level with 2 4 LINE MAX 2 Reense 2 0 1 3A Pin 14 monitors a portion of the output voltage and stops the circuit switching as long as the pin14 voltage exceeds 2 5 V This overvoltage protection OVP guarantees that the bulk voltage cannot exceed the set OVP level about 410 V here The undervoltage that is also attached to pin 14 detects if the OVP pin is accidentally grounded or if one of the upper resistors is not correctly connected and prevents the circuit operation in case of such a fault Ultimately this protection avoids the power supply destruction if there is a failure in the OVP sensing network Shut down if more than 2 5 V are applied to pin 13 the circuit latches off and cannot recover operation until the SMPS is unplugged to enable the NCP1605 Vcc voltage to drop below its 4 V reset voltage This latchoff capability is supposed to trigger in case of a major fault like any overheating of the SMPS In this application it is used to disable the power supply in case of a severe runaway of the Vcc voltage This is simply made by applying the Vcc voltage through a 16 V zener diode D3 so that if 16 V exceeds 2 5 V the circuit latches off see Figure 2 R11 adjusts the biasing current through D3 and together with R42 and C5 this resistor avoids that the protection falsely trigg
18. rms and lour 8A When the PFC output voltage Vpurk reaches its the startup phase The pfcOK pin turns high allowing the nominal voltage about 382 V the circuit detects the end of downstream converter operation www BD fffctom ON NCP1605FORWGEVB TOO V amp C 5700 V M4 00ms TI 7 C 3 0 V 100 V Ch4 5 00 VOV Figure 9 Zoom of the Precedent Plot We can note some skipping sequence that takes place after as soon as VguLx has dropped below 95 5 of its nominal pfcOK has turned high This is because the NCP1605 level This behavior avoids any overshoot during the startup standby management block is controlled by the feedback sequence from occurring signal of the main converter The PFC stage recovers activity www BD fffctom ON NCP1605FORWGEVB Chi 10V amp Cha Fy 10 0V Ch4 5 00 VOS Figure 10 Startup Phase at 120 Vrms Compared to the precedent one Figure 10 further shows the 19 V output Overload Short Circuit Protections The application embeds a circuitry see Figure 13 to detect overload conditions A buffer O1x builds a low impedance signal that is linearly dependent of the feedback pin of the forward controller The OVL circuitry monitors this voltage and if it exceeds 3 V the npn transistor Q3 turns on and disables the discrete regulator that powers the two controllers This circuitry protects the circuit in case of short circuit on the 19 V output In this situ
19. s may be necessary since the voltage across some parts of the board can be as high as 500 V that across the power MOSFETs of both stages for instance Figure 21 Board Connection www BD ff com ON NCP1605FORWGEVB S EWS emiconductor Caution HIGH Voltage E i Output Socket Input socket with earth 19 V output Figure 22 The Board CAUTION the responsibility of those who receive the board to take all The board contains high voltage hot live parts Only the precautions to avoid that themselves or other people are persons skilled in the art of power electronics should injured by electric hazards or are victim of any other pains manipulate or test it Be very cautious when doing so It is caused by the board ON Semiconductor and are registered trademarks of Semiconductor 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 limita
20. tion 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 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 ofthe 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 INFORMATI
21. wn to 360 V in Figure 11 avoids any overshoot and helps provide the 2 switch forward with a narrow input voltage www BD fft com ON NCP1605FORWGEVB VIN 1 00 V div WU che 7 Ch3 100V 8 amp Ch4 5 00 V 10 0 Chi X 00 VOR 100 V div 47V Figure 16 Abrupt Load Decrease at 120 Vrms Standby Performance In light load conditions the circuit enters skip mode to reduce the losses the PFC stage remaining on in stand by Table 3 PIN AVG to keep on providing the 2 switch forward with its nominal input voltage No Load These values were obtained by measuring Wh during 2 mn with a power meter YOKOGAWA WT210 at lour 0 One can note that among the measured losses about 80 mW are due to the two VpuLx sensing networks one for feedback another one for OVP We could then improve these results if only one sensing network was used and or if the leakage current of these sensing networks was lowered by using higher impedance resistors dividers The PFC stage enters skip mode when the load current drops below 0 5 A The following figures show the Vpur voltage in standby mode at low and high line We can see that as explained in the data sheet the NCP1605 skips operation until VguLk reaches 95 5 of its nominal level and then recovers operation Practically VBuULK oscillates between about 380 and 360 V www BD ff com ON NCP1605FORWGEVB 5
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