EV4033-K-00A 198VAC~265VAC/50Hz, 24V/420mA Primary-side-control with Active PFC Off-line Dimmable LED Driver Evaluation Board The Future of Analog IC Technology DESCRIPTION FEATURES The EV4033-K-00A Evaluation Board is designed to demonstrate the capabilities of MP4033 with ripple suppressor. The MP4033 is a primary-side-control offline LED lighting controller which can achieve high power factor and accurate current for Triac dimmable LED lighting application. Its adaptive dimmer type detection and phase-cut-based dimming control can achieve good dimmer compatibility and deep dimming range. • • It works in boundary conduction mode for reducing the MOSFET and Diode switching losses. The new ripple suppressor can obviously reduce the output current ripple and escape the flicker or shimmer happened in deep dimming situation with a little influence in efficiency. The EV4033-K-00A is typically designed for driving a 10W Triac dimmable LED bulb with 24VTYP, 420mA LED load from 198VAC to 265VAC, 50Hz. The EV4033-K-00A has an excellent efficiency and meets IEC61547 surge immunity, IEC61000-3-2 Class C harmonics and EN55015 conducted EMI requirements. It has multi-protection function as over-voltage protection; winding short circuit protection; output short-circuit protection, cycle by cycle current limit, etc. ELECTRICAL SPECIFICATION Parameter Symbol Value Units Input Voltage Output Voltage LED Current VIN VOUT ILED 198 to 265 24 420 VAC V mA Output Power Efficiency (full load) Power Factor THD POUT η PF THD 10 >83 >0.8 <28 W % • • • • • • • • • • • • • • • • Fast Start up Adaptive Dimmer Type Detection and Phase-Cut-Based Dimming Control Triac Dimmable, with good dimmer compatibility and deep dimming range The dimming curve meets standard SSL6 Direct PWM Dimming Real current control without secondaryfeedback circuit Programmable Current Fold-back to Prolong the LED lifetime (NTC) Accurate Line & Load Regulation High power factor over 198VAC to 265VAC Boundary conduction mode improves efficiency Input UVLO Cycle-by-cycle current limit Over-voltage protection (OVP) Output Short-circuit protection (SCP) Winding short circuit protection ZCD Pin short circuit protection Over-temperature protection (OTP) Fit inside A19 bulb enclosure APPLICATIONS • • • Solid State Lighting Industrial & Commercial Lighting Residential Lighting All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology”, are Registered Trademarks of Monolithic Power Systems, Inc. Warning: Although this board is designed to satisfy safety requirements, the engineering prototype has not been agency approved. Therefore, all testing should be performed using an isolation transformer to provide the AC input to the prototype board. % EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EV4033-K-00A EVALUATION BOARD (L x W x H) 62mm x 25mm x 23mm Board Number MPS IC Number EV4033-K-00A MP4033GK EVALUATION BOARD SCHEMATIC L3 2.2mH/0.21A 1 2 R5 5.1K/1206 C4 Q1 L2 1mH/0.1A R2 5.1K/1206 R7 3.9k/1% 2 3 4 MULT ZCD VCC COMP GND NTC DAMP S DIM D 10 TVR10431 D1 BZT52C27 27V/5mA F1 250V/1A L C6 22uF/50V U1 MP4033K R21 20k 6 CY1 2.2nF/250V D10 BAV21W 200V/0.2A C11 330uF/35V D9 B C8 2.2uF/10V D12 BAV21W 200V/0.2A BZT52C2V4 R18 20k 2.4V/5mA LED+ C10 330uF/35V R22 30k/1206 C13 22uF/50V R15 47k/1% Output: 24V/420mA R16 2k/1206 D11 BZT52C4V7 4.7V/5mA LED- 9 8 7 NTC 220K RV1 5 R20 51k AUX+ R9 20/1206 2 1 L1 1mH/0.1A R1 5.1K/1206 1 D8 1N4148 2 C5 4.7nF/50V Q2 ISU04N65A 650V/4A D7 1N4148W 75V/0.15A CX1 22nF/275V 3 R17 10k 1 R19 51 3 L4 Bead/1.5k/1A 2 1 C7 D2 470nF/25V BAV21W 200V/0.2A C12 10nF/100V/0805 2 D3 RLZ TE-11 18D 16.82V/10mA R6 470/1W W 1 1 C2 10nF/50V D4 WSGC10MH 1kV/1A 2 R3 510/2W Q3 AM2340NE/SOT23 40V/5.2A D6 MBRS3200T3G 200V/3A 1 2.2nF/630V 3 BD1 MB6S 450V/0.5A SSN1N45BTA 2 C1 220nF/450V Np:Ns:Naux=132:24:25 R10 470k/0.5W R8 1M/1%/0.25W T1 RM6 Lp=3.4mH C9 22nF/630V R11 499k/1206 C3 100nF/400V R4 510/2W 6 C14 4.7nF/50V D5 R14 9.53k/1% 1N4148W 75V/0.15A R13 2.2/1%/1206 N 198VAC-265VAC R12 0.2/1%/1206 Figure 1—Schematic EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER PCB LAYOUT (SINGLE-SIDED) Figure 2—Top Layer Figure 3—Bottom Layer EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 3 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER CIRCUIT DESCRIPTION The EV4033-K-00A is configured in a singlestage Flyback topology; it uses primary-sidecontrol which can mostly simplify the schematic and get a cost effective BOM. It can also achieve high power factor and accurate LED current. F1, RV1, L1, L2, L3, L4, R1, R2, R5, CX1, BD1, C4 and C3 compose the input stage. F1 fuses the AC input to protect for the component failure or some excessive short events. RV1 is used for surge test. L1, L2, L3, L4, R1, R2, R5, CX1, C3 and C4 associated with CY1 form the EMI filter which can meet the standard EN55015. The diode rectifier BD1 rectifies the input line voltage. Small bulk CBB capacitor C3 is used for a low impedance path for the primary switching current, to maintain high power factor, the capacitance of C3 should be selected with low value. R6, Q1 with C2 compose the damping circuit for reducing the inrush current at the dimmer turning on time. The circuit let the inrush current flow through R6 at first when triac dimmer turns on. Then Q1 turns on and shorts R6, this can save power from R6. R4, R3, C1 are used as a bleeder circuit which keeping the triac current above the minimum holding current after triac turns on. R8, R7, C5 provide sine wave reference for the primary peak current to get an active PFC function. The divided voltage should be lower than the max voltage rating of MULT pin. R9, D1, C6 and D2 are used to supply the power for MP4033. A 22μF bulk capacitor C6 is selected to maintain the supply voltage. At start-up, C6 is first charged up through the external MOSFET Q2 and internal charging circuit, when the VCC voltage reaches 10V, the internal charging circuit stops charging. Then the power supply is taken over by the auxiliary winding through R9, D2. R10, C7, R19, D3 and D7 are used for the gate drive of the external MOSFET Q2. R15, R14 and D5 are used to detect the auxiliary winding to get the transformer magnetizing current zero crossing signal for realizing the boundary conduction operation, and also monitor the output OVP condition. The OVP voltage is set by the divider ratio of R15 and R14. R12, R13 are primary sensing resistors for primary side current control. The value of R12, R13 set the output LED current. C9, R11, D4 are used to damp the leakage inductance energy so the drain voltage can be suppressed at a safe level. Diode D6 rectifies the secondary winding voltage and the capacitor C10, C11 are the output filter. The resistor R22 is placed as pre-load to limit the output voltage rise too high in open load condition. R16, R17, R18, R20, R21, C12, D8, D9, D10, D11, D12, C13 and Q3 compose the ripple suppressor. R17, R18 and C13 offer a stable drive voltage to Q3. D8 and D9 compose the fast start up circuit, which help charge C13 quickly at the moment power on. D10, R21, R20, C12, D12 and R17 add a bias voltage to the gate of Q3, which will help save the power loss of the ripple suppressor obviously. EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 4 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EV4033-K-00A BILL OF MATERIALS Qty Des Value Description 1 BD1 MB6S Bridge, 600V, 0.5A 1 C1 220nF/450V 1 C2 10nF/50V 1 C3 100nF/450V 1 C4 2.2nF/630V 1 C5 4.7nF/50V 1 C6 22uF/50V 1 C7 470nF/50V 1 C8 2.2uF/10V 1 C9 22nF/630V 2 C10, C11 330uF/35V 1 C14 4.7nF/50V 1 CX1 22nF/275V 1 CY1 2.2nF/4000V 1 D1 BZT52C27 1 D2 1 D3 1 D4 D5, D7 2 1 D6 1 F1 L1, L2 2 Package Manufacturer Manufactuer_P/N DIP Taiwan Semiconductor Fala 0603 muRata DIP Fala Ceramic Cap, X7R Ceramic Cap,X7R,50V Electrolytic Capacitor; 50V;Electrolytic Ceramic Cap,X7R,50V Ceramic Cap,10V,X7R Ceramic Cap, 630V，X7R Electrolytic Capacitor, 35V, Electrolytic Ceramic Cap,50V,X7R X Capacitor,275V 1206 muRata GRM31BR72J222KW01L 0603 muRata GRM188R71H472KA01D DIP Jianghai CD281L-50V22 0603 muRata GRM188R71E474KA12D 0603 muRata GRM188R71A225KE15D 1206 TDK DIP JiangHai CD263-35V330 0603 muRata GRM188R71H472KA01D DIP Kaili DIP Hongke JNK12E222MY02N SOD-123 Diodes BZT52C27 BAV21W RLZ TE-11 18D WSGC10MH Y Capacitor,4000V Zener Diode, 27V, 2mA Diode;200V;0.2A; Zener DIODES 16.82V, 10mA Diodes,1000V,1A SOD-123 Diodes BAV21W-7-F SOD-123 ROHM RLZ TE-11 18D SOD-123 ZOWIE WSGC10MH 1N4148WS Diode;75V;0.15A; SOD-323 Diodes 1N4148WS-7-F Diode;200V;3A SMB Qianlongxin MBRS320T3G Fuse DIP any Inductor,1mH Inductor,1mH/0.1A DIP Bangdayuan Inductor,2.2mH/0.21 A Magnetic Bead 1.5k/1A Thermistor N-Channel Mosfet 450V;4250/10V;8.5 N-Channel MOSFET, 650V, 4A DIP Wurth 744741222 0805 Wurth 742792097 0603 muRata MCP13WM224E03R8 TO-92 Fairchild SSN1N45BTA TO-251 IPS MBRS320T3 G 250V/1A 1 L3 Inductor,2.2m H 1 L4 BEAD 1 NTC 1 Q1 220kΩ SSN1N45BT A 1 Q2 ISU04N65A CBB,450V Ceramic Cap,X7R,50V 104/450V SOIC-4 MB6S C222S224K31C000 GRM188R71H103KA01D C222S104K30C000 C3216X7R2J223K PX223K3IB19L270D9R CKL0410-102 ISU04N65A EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 5 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EV4033-K-00A BILL OF MATERIALS (continued) Qty Des Value Description Package Manufacturer 5.1kΩ Manufactuer_P/N Film Resistor;1%;1/4W 1206 Yageo 510Ω DIP,2W RESISTOR DIP any 470Ω 3.9kΩ DIP,1W RESISTOR Film RES, 1% DIP,0.25W RESISTOR Film RES;1% Resistor;5%;0.5W Film RES, 1% Film RES, 1% Film RES, 1% Film RES, 1% Film RES, 1% Film RES,1% Resistor;1% DIP 0603 any Yageo DIP any 1206 DIP 1206 1206 1206 0603 0603 0603 1206 Yageo any Yageo Yageo Royalohm Yageo Yageo Yageo Yageo 430V/2500A DIP TKS TVR10431KSY RM6 Emei FX0342 MSOP10 MPS MP4033GK 0805 TDK C2012X7R2E103K DIP Jianghai SOD-123 Diodes BAV21W-7-F SOD-323 Diodes BZT52C4V7S SOD-323 Diodes BZT52C2V4S SOD-323 Diodes 1N4148WS-7-F SOT23 Analog Power 1206 0603 Yageo Yageo RC1206FR-072KL RC0603FR-0710KL 1 1 R1, R2, R5 R3, R4 R6 R7 1 R8 1MΩ 1 1 1 1 1 1 1 1 1 R9 R10 R11 R12 R13 R14 R15 R19 R22 1 RV1 20Ω 470kΩ/0.5W 499kΩ 200mΩ 2.2Ω 9.53kΩ 47kΩ 51Ω 30kΩ TVR10431KS Y 1 T1 RM6 1 U1 MP4033GK 1 C12 10nF/250V 1 C13 22uF/50V 2 D10, D12 BAV21W 1 D11 1 D9 1 D8 BZT52C4V7 S BZT52C2V4 S 1N4148WS 1 Q3 AM2340NE 1 1 R16 R17 R18, R21 R20 2kΩ 10kΩ Zener Diode, 4.7V, 5mA Zener Diode, 2.4V, 5mA Diode;75V;0.15A; N-channel MOSFET, 40V,5.2A Film RES;1% Film RES;1% 20kΩ Film RES;1% 0603 Yageo RC0603FR-0720KL 51kΩ Film RES;1% 0603 Yageo RC0603FR-0751KL 3 2 2 1 RM6, Lp=3.4mH Np:Ns:Naux=132:24: 25, MP4033GK Ceramic Cap,X7R,250V Electrolytic Capacitor; 50V;Electrolytic Diode;200V;0.2A; RC1206FR-075K1L 510Ω/2W 470Ω/1W RC0603FR-073K9L 1MΩ/0.25W RC1206FR-0720RL 470kΩ/0.5W RC1206FR-07499KL RC1206FR-070R2L 1206TF2R20 RC0603FR-079K53L RC0603FR-0747kL RC0603FR-0751RL RC1206FR-0730kL CD281L-50V22 AM2340NE Note: the components in blue compose the ripple suppressor. It is optional. EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 6 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER TRANSFORMER SPECIFICATION Electrical Diagram Figure 4—Transformer Electrical Diagram Notes: 1. Don’t connect Y to any pin of Bobbin. 2. W and B are pulled out and marked with different Teflon tube. 3. E1 is one layer of cooper foil applied to core, and connected to PIN3 by a wire. Winding Diagram Top. Side Pin. Side 3Ts 1Ts 1Ts 1Ts N4 N3 N2 N1 Bobbin Figure 5—Winding Diagram EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 7 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER Winding Order Winding No. N1 N2 N3 N4 E1 Tape Layer Number 0 1 1 1 3 Start & End 2→NC Aux+→6 W→B NC→1 Magnet WireΦ(mm) 0.15mm * 1 0.15mm * 1 0.30mm (T.I.W) 0.15mm * 1 One layer Cooper foil Turns 66 25 24 66 Electrical Specifications Electrical Strength Primary Inductance Primary Leakage Inductance 60 second, 60Hz, from PRI. to SEC. 2500VAC 60 second, 60Hz, from PRI. to CORE. 1000VAC 60 second, 60Hz, from SEC. to CORE. 1000VAC Pins 1 - 2, all other windings open, measured at 100kHz, 0.1 VRMS Pins 1 - 2 with all other pins shorted, measured at 100kHz. 0.1 VRMS 3.4mH±8% 43μH±10% Materials Item 1 2 3 4 5 6 7 8 9 10 Description 2 Core: RM6, UI=2500±25%, AL=221.5H/N ±2% GAP, ACME P4 or equivalent Bobbin: RM6, 3+3PIN RMMOVE PIN6 1SECT TH, PM9630 UL94V-0 Wire: Φ0.16mm, 2UEW, CLASS F or equivalent Triple Insulation Wire: great Φ0.30mm,TRW(B) or equivalent TEFLON TUBE: TFL AWG#30 TEFLON TUBE: TFL AWG#24 Tape: 6.5mm(W)×0.06mm(TH) Tape: 4.0mm(W)×0.06mm(TH) Varnish: JOHN C. DOLPH CO, BC-346A or equivalent Solder Bar: CHEN NAN: SN99.5/Cu0.5 or equivalent EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 8 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EVB TEST RESULTS Performance Data Efficiency, PF and THD f (Hz) Vin(V) Pin(W) Vo(V) Io(mA) Po(W) Efficiency(%) PF THD(%) 50 198 210 220 230 240 250 260 265 11.53 11.55 11.57 11.61 11.65 11.70 11.75 11.78 23.24 23.24 23.23 23.23 23.23 23.23 23.23 23.23 419 420 421 422 422 423 424 424 9.74 9.76 9.78 9.80 9.80 9.83 9.85 9.85 84.45 84.51 84.53 84.44 84.15 83.99 83.83 83.61 0.938 0.925 0.914 0.902 0.890 0.877 0.864 0.857 17.00 19.00 20.10 21.10 22.60 23.40 24.80 25.50 Dimming Compatibility (No Flicker with these 19 different Dimmers) Dimming Manufacturer Part No. Power Stage Imax(mA) Type GIRA MIKA Berker JUNG JUNG Berker JUNG EMC Busch Busch Busch Grundtyp MIKA MIKA? Busch Busch JUNG SIEMENS LICHTREGLER JUNG Berker 0302 00/I01 433/4 283010 225 NV DE 225 NV DE 286610 266 GDE PROP400U 2247U 2200.. 6513 U-102 ET1_53850 433 HAB EIM-585 6591U-101 6519U 225 TDE 5TC8 284 T46s 254 UDIE 1 286110 60-600W 60-400W 60-400W 20-500W/VA 20-500W/VA 20-500W 60-600W 40-400W 500W/VA 60-400W 420W/VA 25~300W 20-315W 20-300W 420W/VA 550W/VA 20-525W 20-600W 20~315W 50-420W/VA 50-420W Leading Leading Leading Leading Leading Leading Leading Leading Leading Leading Trailing Trailing Trailing Trailing Trailing Trailing Trailing Trailing Trailing Trailing Trailing 533 531 531 531 532 531 527 531 531 530 531 445 406 458 462 527 504 481 514 527 526 Imin(mA) Dimming ratio 30 91 43 22 105 40 33 28 50 54 50 40 46 1 39 50 44 30 61 71 72 5.63% 17.14% 8.10% 4.14% 19.74% 7.53% 6.26% 5.27% 9.42% 10.19% 9.42% 8.99% 11.33% 0.22% 8.44% 9.49% 8.73% 6.24% 11.87% 13.47% 13.69% EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 9 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER Electric Strength Test Primary circuit to secondary circuit electric strength testing was completed according to IEC61347-1 and IEC61347-2-13. Input and output was shorted respectively. 3750VAC/50Hz sine wave applied between input and output for 1min, and operation was verified. Surge Test Line to Line 500V and Line to Power Earth 1kV surge testing was completed according to IEC61547. Input voltage was set at 230VAC/50Hz. Output was loaded at full load and operation was verified following each surge event. Surge Level (V) Input Voltage (VAC) Injection Location Injection Phase (°) Test Result (Pass/Fail) 500 -500 1000 -1000 1000 -1000 230 230 230 230 230 230 L to N L to N L to PE L to PE N to PE N to PE 90 270 90 270 90 270 Pass Pass Pass Pass Pass Pass Thermal Test Test without dimmer and with dimmer at 90% dimming on phase. EMI inductor L3: 68.8℃ Without dimmer Damping resister: 108.0℃ With dimmer at 90% dimming on phase EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 10 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EVB TEST RESULTS Performance waveforms are tested on the evaluation board. VIN=230VAC/50Hz, 8 LEDs in series, ILED=420mA, VOUT=24V, LP=3.4mH, NP:NS:NAUX =132:24:25 EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 11 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN=230VAC/50Hz, 8 LEDs in series, ILED=420mA, VOUT=24V, LP=3.4mH, NP:NS:NAUX =132:24:25. EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 12 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER EVB TEST RESULTS (continued) Performance waveforms are tested on the evaluation board. VIN=230VAC/50Hz, 8 LEDs in series, ILED=420mA, VOUT=24V, LP=3.4mH, NP:NS:NAUX =132:24:25. EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 13 EV4033-K-00A – HIGH LINE VOLTAGE, 10W PSR WITH PFC DIMMABLE LED DRIVER QUICK START GUIDE 1. Preset AC Power Supply to 198VAC ≤ VIN ≤265VAC. 2. Turn Power Supply off. 3. Connect the LED string between “LED+” (anode of LED string) and “LED-” (cathode of LED string). 4. Connect Power Supply terminals to AC VIN terminals as shown on the board. 5. Turn AC Power Supply on after making connections. EV4033-K-00A Rev.1.0 www.MonolithicPower.com 7/15/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 14