Supertex inc. HV9931DB2 LED Driver Demoboard Input 230VAC // Output 350mA, 40V (14W) General Description The HV9931 LED driver is primarily targeted at low to medium power LED lighting applications where galvanic isolation of the LED string is not an essential requirement. The driver provides near unity power factor and constant current regulation using a two stage topology driven by a single MOSFET and control IC. Triac dimming of this design is possible with the addition of some components for preloading and inrush current shaping. The DB1 and DB2 Demoboards were designed for a fixed string current of 350mA and a string voltage of 40V for a load power of about 14W. The boards will regulate current for an output voltage down to 0V. Nominal input voltage for the DB1 is 120VAC, for the DB2 230VAC. Design for universal input (85 to 265VAC) is by all means possible but does increase cost and size while lowering efficiency. The input EMI filter was designed to suppress the differential mode switching noise to meet CISPR15 requirements. No specific components were added to suppress currents of common mode nature. Common mode current can be controlled in many ways to satisfy CISPR 15 requirements. featured are output current soft start and protections from line overvoltage, load overvoltage and open circuit. The driver is inherently short circuit proof by virtue of the peak current regulation method. Specifications Input voltage: 200VRMS to 265VRMS, 50Hz Output voltage: 0 to 40V Output current: 350mA +/-5% Output power: 14W Power factor 98% Total harmonic distortion EN61000-3-2 Class C EMI limits CISPR 15 (see text) Efficiency 83% Output current ripple 30%PP Input overvoltage protection 265VRMS, Non-Latching Output overvoltage protection 46V, Latching Switching frequency 80kHzNOM Dimensions: 3.5” x 3.0” x 1.25” The board is fitted with a number of optional circuits; a schematic of a simplified driver is given as well. The circuits Board Layout and Connections A V V A Doc.# DSDB-HV9931DB2 A062513 Supertex inc. www.supertex.com HV9931DB2 Special Note: The electrolytic capacitor carries a hazardous voltage for an extended time after the board is disconnected. The board includes a 1MΩ resistor placed across the electrolytic capacitor which will slowly discharge the capacitor after disconnection from line voltage. The voltage will fall more or less exponentially to zero with a time constant of about 100 seconds. Check the capacitor voltage before handling the board. Warning! Working with this board can cause serious bodily harm or death. Connecting the board to a source of line voltage will result in the presence of hazardous voltage throughout the system including the LED load. The board should only be handled by persons well aware of the dangers involved with working on live electrical equipment. Extreme care should be taken to protect against electric shock. Disconnect the board before attempting to make any changes to the system configuration. Always work with another person nearby who can offer assistance in case of an emergency. Wear safety glasses for eye protection. Connection Instructions voltage and LED string voltage are more or less constant as well. Duty cycle and bus voltage do adjust in response to changes in line or load voltage but are otherwise constant over the course of a line cycle. With the HV9931, OFF time is fixed by design, being programmed by an external resistor, whereas ON time adjusts to a more or less constant value, being under control of the HV9931 peak current regulator. Step 1. Carefully inspect the board for shipping damage, loose components, etc, before making connections. Step 2. Attach the board to the line and load as shown in the diagram. Be sure to check for correct polarity when connecting the LED string to avoid damage to the string. The board is short circuit and open circuit proof. The LED string voltage can be anything between zero and 40V, though performance will suffer when the string voltage is substantially lower than the target of 40V. See the typical performance graphs. Principles of Operation The input or buck-boost stage is designed for operation in discontinuous conduction mode (DCM) throughout the range of line and load voltage anticipated. This can be accomplished by making the input inductor sufficiently small. A well known property of the DCM buck-boost stage, when operated with constant ON time and constant OFF time, is that input current is proportional to input voltage, whether in peak value or average value. This results in sinusoidal input current when the input voltage is sinusoidal, thereby giving unity power factor operation when operating from the rectified AC line voltage. The output or buck stage is designed for operation in continuous conduction mode (CCM), operating with about 20 to 30% inductor current ripple. This amount of ripple serves the needs of the HV9931 peak current controller which relies on a sloping inductor current for setting ON time, and is of an acceptable level to high brightness LEDs. Duty cycle is more or less constant throughout the line cycle as the DC bus When operated in the anticipated range of line and load voltage, the MOSFET ON time will be under control of the output stage current controller, which turns the MOSFET off when sensing that the output inductor current has reached the desired peak current level as programmed by a resistive divider at the CS2 pin. Under certain abnormal circumstances such as initial run-up and line undervoltage, which both could lead to the draw of abnormally high line current, ON time is further curtailed by the action of the CS1 comparator, which monitors the input stage inductor current against a threshold. This threshold can be a simple DC level or be shaped in time as is performed on the Demoboard. In particular, when shaping the CS1 threshold with the shape of the rectified AC line input voltage waveform, the line current will be bounded by a more or less sinusoidal line current envelope which results in sinusoidal input current for low line and other abnormal conditions. Step 3. Energize the mains supply. The board can be connected to mains directly. Alternatively voltage can be raised gradually from zero to full line voltage with the aid of an adjustable AC supply such as a Variac or a programmable AC source. The HV9931 topology can be viewed as a series connection of two basic power supply topologies, (1) a buck-boost stage as first or input stage, for purpose of converting AC line power into a source of DC power, commonly known as the DC bus, having sufficient capacitive energy storage to maintain the bus voltage more or less constant throughout the AC line cycle, and (2) a buck stage as second or output stage for powering the LED string, stepping down the DC bus voltage to the LED string voltage in order to produce a steady LED string current. Doc.# DSDB-HV9931DB2 A062513 2 Supertex inc. www.supertex.com HV9931DB2 The design exercise of an HV9931 LED driver revolves around establishing component values for (1) the input and output stage inductors, (2) a value for the bus capacitor, and (3) a value for switching cycle OFF time, which together result in (1) acceptable current ripple at the output stage (say 30%), (2) an acceptable bus voltage ripple (say 5%), and (3) an input stage which maintains DCM operation over the desired line and load voltage range. simulation, which, allows components to be adjusted in an iterative manner, starting from an initial guess. The tool allows quick evaluation of nine standard test cases, exercising the design over line voltage variation and tolerance variation of three component parameters. Mathcad design data can be found at the end of this document. The data tends to be in good agreement with the actual Demoboard despite the omission of switching losses in the model. For this design we can see that the calculated efficiency is off by say 5 percent likely due underestimation of switching losses and inductor core and winding losses. For a given HV9931 design, the bus voltage rises and falls with like changes in line and load voltage. This is unlike a two stage design having two transistors and control ICs, where the bus voltage can be set independent of line and load voltage variation. If the desired ranges of line and load voltage are particularly large then the latter topology may be preferable so as to avoid large variation in bus voltage. The design of an HV9931 based LED driver is not further discussed here, except for noting that a semi-automatic design tool is available in Mathcad form, based on behavioral A Simplified Version of the Design The Demoboard can be simplified significantly. Below is a schematic showing the essential elements of the driver. Contact Supertex Applications Engineering for guidance in simplifying the design or for adding functions such as triac dimmability. Simplified Schematic Diagram F11 250mA AC2 L21 2.2mH L11 2.2mH C11 47nF 1 E31 22μF D31 STTH108A + R37 6.8kΩ C21 47nF D42 STTH1R06A M31 SPA02N80C3 R51 205kΩ 1 R62 2.43kΩ THROV BT168GW ZOV BZX84C43 ANO A R61 270mΩ C ROV 10kΩ CAT C37 100pF 4 Optional Output Overvoltage Protection L41 3.9mH D41 STTH1R06A C BR11 RH06-T 2 L31 1.2mH 3 C12 47nF AC1 D32 STTH108A VIN 2 8 RT GATE IC51 CS1 R68 75kΩ 4 R71 680mΩ R72 2.67kΩ CS2 HV9931LG GND VDD PWM 3 6 5 7 R73 75kΩ A C51 10µF Note on Inductors: can be wound for lowest cost without coil former (bobbin). They may serve well during the development stage, but may not be the best choice for final design. Keep these type of inductors away form any metallic surface such as heatsinks, PCB copper planes, metallic enclosures, and capacitors, as these unshielded parts can create high eddy current losses in these parts. For tightly packaged designs or where inductor losses are an issue, drum core style inductors are not recommended. This board was fitted with standard (COTS) inductors. These are not necessarily an optimal choice but present an expedient way to go when evaluating a design. Custom engineered parts generally give better performance, particularly with respect to efficiency. Drum core style inductors, whether in radial or axial leaded versions, are popular for their ready availability and low cost. Drum core styles have particularly simple construction and Doc.# DSDB-HV9931DB2 A062513 3 Supertex inc. www.supertex.com Doc.# DSDB-HV9931DB2 A062513 AC1 AC2 4 R83 1MΩ R84 1MΩ MOV11 430V R82 13.0kΩ F11 250mA C12 47nF Q82 MMBT2907A C11 47nF L11 2.2mH C81 10nF TVS11 SMAJ 440CA 2 4 R80 200kΩ Q81 MMBT2222A R81 10kΩ 3 1 REC BR11 RH06-T DN65 BAV99 C65 10µF 2 1 3 L21 2.2mH L1D R68 1MΩ R88 10MΩ R87 200kΩ 2 R37 6.8kΩ Q84 MMBT2907A VDD 6 3 C51 10µF HV9931 IC51 VDD ENA R51 205kΩ GATE 4 GATE CS2 5 PWM RT 8 D39 MMDB914 7 L41 3.9mH R90 200kΩ C72 100pF R79 100Ω D42 STTH1R06A SN2 D79 MMBD914 D41 STTH1R06A M31 SPA02N80C3 R31 10MΩ + E31 22μF GND CS1 VIN 1 IDD R39 100Ω C37 100pF D31 STTH108A R99 1kΩ C62 100pF R62 2.43kΩ R86 100kΩ Q83 MMBT2222A R85 100kΩ Z61 BZX84C7V5 R64 1.3MΩ R63 75kΩ R65 1.3MΩ R61 270mΩ RS1 C21 47nF D37 STTH108A L31 1.2mH D32 STTH108A R73 75kΩ R72 2.67kΩ R71 680mΩ RS2 C41 10nF Z90 BZX84C7V5 Z91 BZX84C47 GND2 GND1 ANO CAT HV9931DB2 Schematic Diagram Supertex inc. www.supertex.com HV9931DB2 Typical Characteristics String Current [mA] vs. String Voltage [V] 1000 100 900 90 800 80 200VRMS 70 700 265VRMS 600 60 230VRMS 500 50 400 40 300 30 200 20 200VRMS 100 0 Efficiency [%] vs. String Voltage [V] 0 10 265VRMS 230VRMS 10 20 30 40 0 50 0 10 20 30 40 50 THD [%] vs. String Voltage [V] PF [%] vs. String Voltage [V] 30 100 90 25 80 200VRMS 230VRMS 265VRMS 70 60 50 265VRMS 20 200VRMS 15 230VRMS 40 10 30 20 5 10 0 0 10 Doc.# DSDB-HV9931DB2 A062513 20 30 40 0 50 5 0 10 20 30 40 50 Supertex inc. www.supertex.com HV9931DB2 Typical Waveforms (1) Line Voltage and Current at nominal load (350mA, 40V) 200VRMS 230VRMS 265VRMS IAC VAC Line Voltage and Current at half load (350mA, 20V) 200VRMS 230VRMS 265VRMS Output Current and Drain Voltage at nominal load (350mA, 40V) VDRAIN ILED (Peak) ILED (Valley) Output Current and Drain Voltage at half load (350mA, 20V) Doc.# DSDB-HV9931DB2 A062513 6 Supertex inc. www.supertex.com HV9931DB2 Typical Waveforms (2) (120VRMS, 40V, 350mA) Drain Voltage and LED Current 40µs per div 400µs per div 4µs per div 350mAAVE ILED VDRAIN Drain Voltage and Gate Voltage 40ns per div 4µs per div 40ns per div VG @ IC51 VGATE VG @ M31 Turn-ON VDRAIN Turn-OFF Recovery of D41 Recovery of D42 Drain Voltage and Current Sense Voltages of Stages 1 and 2 VRS1 Recovery of D42 VRS2 VDRAIN Recovery of D41 Drain Voltage and Voltages at Test Points REC, SN3, SN2 VREC Doc.# DSDB-HV9931DB2 A062513 VSN3 7 VSN2 Supertex inc. www.supertex.com HV9931DB2 Typical Waveforms (3) (120VRMS, 40V, 350mA) Drain Voltage and Voltage at the Test Point L1D (3 points along the AC line cycle) AT ~ 90° AT ~ 30° AT ~ 10° Clamping action of D37 VDRAIN VL1D Doc.# DSDB-HV9931DB2 A062513 8 Supertex inc. www.supertex.com HV9931DB2 EMI Signature Board suspended about 3” above reference plane. Limit Line: CISPR 15 Quasi Peak (9kHz to 30MHz) Detector: Peak Hold IF Bandwidth:9kHz Shielding: 2 copper shields, surrounding the power section on top and bottom of the board, terminated at the source of the MOSFET. Without shielding : 110dBµV 100dBµV 90 80 66 60 56 50dBµV 10kHz 100kHz 10MHz 1MHz With shielding : 110dBµV 100dBµV 90 80 66 60 56 50dBµV 10kHz 100kHz 1MHz The performance graphs above were obtained from the board not having specific measures to suppress common mode emissions, such as inclusion of a common mode inductor in the AC line input circuitry. The above graphs show how shielding can significantly reduce emissions, particu- Doc.# DSDB-HV9931DB2 A062513 10MHz larly in the upper frequency range. The shielding also was instrumental in reducing the lower frequency emissions by reducing magnetic field coupling from the main inductors to the EMI filter inductors (EMI filter section kept outside of shielded area). 9 Supertex inc. www.supertex.com HV9931DB2 Mathcad Design Data Corner x 0 0 1 2 3 4 5 6 7 8 Corner - - - - L1 uH 0 1320 1200 1080 1320 1200 1080 1320 1200 1080 L1 - - - - RL1 mR 0 4400 4400 4400 4400 4400 4400 4400 4400 4400 RL1 - - - - L2 mH 0 3900 3900 3900 3900 3900 3900 3900 3900 3900 L2 - - - - RL2 mR 0 3000 3000 3000 3000 3000 3000 3000 3000 3000 RL2 - - - - ILRF2 % 0 28 28 28 28 28 28 28 28 28 ILRF2 - - - - C2 uF 0.0 17.6 22.0 26.4 17.6 22.0 26.4 17.6 22.0 26.4 C2 - - - - NF x 0 2 2 2 2 2 2 2 2 2 NF - - - - LF uH 0 2200 2200 2200 2200 2200 2200 2200 2200 2200 LF - - - - RLF mR 0 2300 2300 2300 2300 2300 2300 2300 2300 2300 RLF - - - - CF nF 0 47 47 47 47 47 47 47 47 47 CF - - - - C1 nF 0 47 47 47 47 47 47 47 47 47 C1 - C2V 135 - RS mR 0 1000 1000 1000 1000 1000 1000 1000 1000 1000 RS - C2I 1345 - VD mV 0 1500 1500 1500 1500 1500 1500 1500 1500 1500 VD - - - - TF us 0.0 9.1 9.1 9.1 9.1 9.1 9.1 9.1 9.1 9.1 TF - - - - RT kR 0 205 205 205 205 205 205 205 205 205 RT - - - - FM Hz 0 50 50 50 50 50 50 50 50 50 FM - - - - VMRMS V 0 200 200 200 230 230 230 265 265 265 VMRMS - - - - IMRMS mA 0 84 81 78 73 70 68 63 61 59 IMRMS 68 73 59 84 IMMAX mA 0 125 117 112 107 101 98 92 88 84 IMMAX 98 107 84 125 V3AVG V 0 40 40 40 40 40 40 40 40 40 V3AVG 40 40 40 40 I3AVG mA 0 360 350 340 360 350 340 360 350 340 I3AVG 340 360 340 360 PM W 0.0 16.4 16.0 15.4 16.3 15.8 15.4 16.2 15.7 15.2 PM 15.4 16.3 15.2 16.4 P3 W 0.0 14.4 14.0 13.6 14.4 14.0 13.6 14.4 14.0 13.6 P3 13.6 14.4 13.6 14.4 EFF % 0.0 87.8 87.8 88.3 88.5 88.7 88.3 88.8 89.4 89.4 EFF 88.3 88.7 87.8 89.4 PF % 0.0 97.6 98.6 99.0 97.6 98.3 98.6 97.1 97.6 97.7 PF 97.6 98.6 97.1 99.0 THD % 0.0 9.9 5.7 3.6 7.6 4.5 2.9 5.9 3.6 2.5 THD 2.9 7.6 2.5 9.9 H3 % 0.0 9.7 5.6 3.5 7.5 4.3 2.7 5.8 3.4 2.2 H3 2.7 7.5 2.2 9.7 H5 % 0.0 1.8 0.9 0.6 1.2 0.7 0.5 0.9 0.5 0.5 H5 0.5 1.2 0.5 1.8 TAMIN us 0.0 3.1 3.3 3.4 2.7 2.8 2.9 2.3 2.4 2.5 TAMIN 2.7 2.9 2.3 3.4 TAMAX us 0.0 4.0 3.8 3.7 3.2 3.1 3.1 2.6 2.6 2.6 TAMAX 3.1 3.2 2.6 4.0 TFMIN us 0.0 7.3 9.1 10.9 7.3 9.1 10.9 7.3 9.1 10.9 TFMIN 7.3 10.9 7.3 10.9 TFMAX us 0.0 7.3 9.1 10.9 7.3 9.1 10.9 7.3 9.1 10.9 TFMAX 7.3 10.9 7.3 10.9 DAMIN % 0.0 30.0 26.8 23.7 27.0 23.8 21.1 24.2 21.1 18.6 DAMIN 21.1 27.0 18.6 30.0 DAMAX % 0.0 35.3 29.5 25.2 30.7 25.7 22.1 26.7 22.4 19.2 DAMAX 22.1 30.7 19.2 35.3 Doc.# DSDB-HV9931DB2 A062513 10 Supertex inc. www.supertex.com HV9931DB2 Mathcad Design Data (cont.) Corner x 0 0 1 2 3 4 5 6 7 8 Corner - - - - DC1MAX % 0.0 99.0 77.6 62.0 88.9 69.3 55.5 79.7 61.6 49.0 DC1MAX 55.5 88.9 49.0 99.0 FSMIN kHz 0.0 89.0 77.7 68.7 95.4 81.9 71.5 100.9 85.5 74.1 FSMIN 71.5 95.4 68.7 100.9 FSMAX kHz 0.0 96.3 80.7 70.0 100.5 83.9 72.4 104.4 86.9 74.7 FSMAX 72.4 100.5 70.0 104.4 IL1RMS mA 0 275 275 273 254 253 254 235 234 234 IL1RMS 253 254 234 275 IL1MAX mA 0 723 810 897 702 789 883 686 772 864 IL1MAX 702 883 686 897 IL2RMS mA 0 361 351 342 361 351 342 361 351 342 IL2RMS 342 361 342 361 IL2MAX mA 0 400 400 400 400 400 400 400 400 400 IL2MAX 400 400 400 400 I2RMS mA 0 300 282 266 280 263 249 262 245 231 I2RMS 249 280 231 300 V2MIN V 0 121 145 170 139 166 193 160 191 222 V2MIN 139 193 121 222 V2MAX V 0 142 160 180 158 179 202 177 202 230 V2MAX 158 202 142 230 V2RELPPR % 0.0 16.0 9.5 5.8 12.6 7.3 4.6 10.0 5.7 3.5 V2RELPPR 5 13 4 16 ISRMS mA 0 354 343 333 329 318 310 306 295 287 ISRMS 310 329 287 354 ISMAX mA 0 1122 1209 1296 1101 1189 1282 1085 1172 1263 ISMAX 1101 1282 1085 1296 VSMAX V 0 415 433 455 473 496 520 542 568 597 VSMAX 473 520 415 597 IDL1AVG mA 0 191 170 152 167 148 134 147 129 116 IDL1AVG 134 167 116 191 IDF1AVG mA 0 117 98 83 103 87 74 92 76 65 IDF1AVG 74 103 65 117 IDR2AVG mA 0 117 98 83 103 86 73 91 76 64 IDR2AVG 73 103 64 117 IDF2AVG mA 0 243 252 257 257 264 267 269 274 276 IDF2AVG 257 267 243 276 IRS1RMS mA 0 167 174 180 153 160 167 141 146 153 IRS1RMS 153 167 141 180 IRS2RMS mA 0 205 186 169 193 175 159 182 164 149 IRS2RMS 159 193 149 205 Doc.# DSDB-HV9931DB2 A062513 11 Supertex inc. www.supertex.com HV9931DB2 Simulated Waveforms (Mathcad) Corner 0 (100VAC) (High Duty) Corner 1 (100VAC) (Nom Duty) Corner 2 (100VAC) (Low Duty) Corner 3 (120VAC) (High Duty) Corner 4 (120VAC) (Nom Duty) Corner 5 (120VAC) (Low Duty) Corner 6 (135VAC) (High Duty) Corner 7 (135VAC) (Nom Duty) Corner 8 (135VAC) (Low Duty) Drain Voltage Envelope Rectified Line Voltage Bus Voltage Input Inductor Peak Current Envelope Line Voltage Doc.# DSDB-HV9931DB2 A062513 Line Current 12 Supertex inc. www.supertex.com HV9931DB2 Bill of Materials Qty REF Description Manufacturer Product Number 1 BR11 RECT BRIDGE GP MINIDIP 600V 0.5A Diodes Inc RH06-T 2 C62, C72 CAP CER NP0 50V 10% 0805 100PF Kemet C0805C101K5GACTU 2 C41, C81 CAP CER X7R 100V 10% 0805 10NF Kemet C0805C103K1RACTU 1 C37 CAP CER NP0 1000V 5% 0805 100PF Vishay/Vitramon VJ0805A101JXGAT5Z 2 C51, C65 CAP CER X7R 16V 10% 1206 10µF Murata GRM31CR71C106KAC7L 3 C11, C12, C21 CAP MKP 305VAC X2 125C 20% 47NF EPCOS Inc B32921A2473M 3 D31, D32, D37 DIODE ULTRAFAST 800V 1A SMA STMicroelectronics STTH108A 2 D41, D42 DIODE ULTRAFAST 600V 1A SMA STMicroelectronics STTH1R06A 2 D39, D79 DIODE ULTRAFAST HI COND SOT-23 Fairchild Semiconductor MMBD914 1 DN65 DIODE SW DUAL 75V 350MW SOT23 Diodes Inc BAV99-7-F 1 E31 CAP ALEL ED RAD10X20 250V 20% 22µF Panasonic ECG EEU-ED2E220 1 F11 FUSE SLOW IEC TR5 250MA Littelfuse Wickmann 37202500411 1 HS HEATSINK TO220 W/TAB W86 D40 H75 21K Aavid Thermalloy 574502B03700G 1 IC51 IC LED DRIVER 8L SOIC Supertex HV9931LG-G 2 L11, L21 CHOKE SH RAD13MM 15% 2.2MH 520MA Sumida RCP1317NP-222L 1 L31 CHOKE RAD 450D 710L 10% 1200µH Renco RL-5480-4-1200 1 L41 CHOKE RAD 625D 700L 10% 3.9MH Renco RL-5480-5-3900 1 M31 MOSFET N-CH 800V 2A 2.7R TO-220FP Infineon Technologies SPA02N80C3 1 MOV11 SUR ABSORBER 10MM 430VDC 2500A ZNR Panasonic ECG ERZ-V10D431 2 Q81, Q83 TRANSISTOR GP NPN AMP SOT-23 Fairchild Semiconductor MMBT2222A 2 Q82, Q84 TRANSISTOR GP PNP AMP SOT-23 Fairchild Semiconductor MMBT2907A 1 R99 RES 1/8W 0805 1% 1.00KΩ Panasonic ECG ERJ-6ENF1001V 2 R39, R79 RES 1/8W 0805 1% 100Ω Panasonic ECG ERJ-6ENF1000V 1 R62 RES 1/8W 0805 1% 2.43KΩ Panasonic ECG ERJ-6ENF2431V 1 R72 RES 1/8W 0805 1% 2.67KΩ Panasonic ECG ERJ-6ENF2671V 1 R81 RES 1/8W 0805 1% 10.0KΩ Panasonic ECG ERJ-6ENF1002V 1 R82 RES 1/8W 0805 1% 13.0KΩ Panasonic ECG ERJ-6ENF1302V 1 R63, R73 RES 1/8W 0805 1% 75.0KΩ Panasonic ECG ERJ-6ENF7502V 2 R85, R86 RES 1/8W 0805 1% 100KΩ Panasonic ECG ERJ-6ENF1003V 1 R51 RES 1/8W 0805 1% 205KΩ Panasonic ECG ERJ-6ENF2053V 3 R80, R87, R90 RES 1/8W 0805 1% 200KΩ Panasonic ECG ERJ-6ENF2003V 2 R64, R65 RES 1/8W 0805 1% 1.30MΩ Panasonic ECG ERJ-6ENF1304V 3 R68, R83, R84 RES 1/8W 0805 1% 1.00MΩ Panasonic ECG ERJ-6ENF1004V 1 R88 RES 1/8W 0805 1% 10.0MΩ Vishay/Dale CRCW080510M0FKEA Doc.# DSDB-HV9931DB2 A062513 13 Supertex inc. www.supertex.com HV9931DB2 Bill of Materials (cont.) Qty REF Description Manufacturer Product Number 1 R37 RES 1/4W 1206 5% 6.8KΩ Panasonic ECG ERJ-8GEYJ682V 1 R31 RES 1/4W 1206 1% 10.0MΩ Vishay/Dale CRCW120610M0FKEA 1 R61 RES 1/4W 0805 1% .27Ω Susumu Co Ltd RL1220S-R27-F 1 R71 RES 1/4W 0805 1% .68Ω Susumu Co Ltd RL1220S-R68-F 1 TVS11 DIODE TVS BIDIR SMA 400W 5% 440V Littelfuse Inc SMAJ440CA 2 Z61, Z90 DIODE ZENER 350MW SOT-23 7.5V Diodes Inc BZX84C7V5-7-F 1 Z91 DIODE ZENER 350MW SOT-23 47V Diodes Inc BZX84C47-7-F Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. ©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSDB-HV9931DB2 A062513 14 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com