Supertex inc. HV9931DB1 LED Driver Demoboard Input 120VAC // 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. 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: 100VRMS to 135VRMS, 60Hz Output voltage: 0 to 40V Output current: 350mA +/-5% Output power: 14W, Max Power factor 98% Total harmonic distortion EN61000-3-2 Class C EMI limits CISPR 15 (see text) Efficiency 83% Output current ripple 30%PP 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. Input overvoltage protection 140VRMS, Latching Output overvoltage protection 43V, Latching Switching frequency 73kHz The board is fitted with a number of optional circuits; a schematic of a simplified driver is given as well. The circuits Dimensions: 3.5” x 3.0” x 1.25” 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. Board Layout and Connections A V V A Doc.# DSDB-HV9931DB1 A032713 Supertex inc. www.supertex.com HV9931DB1 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 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. 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. 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. Principles of Operation 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. 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. 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 voltage and LED string voltage are more or less constant as well. Duty cycle and bus voltage do adjust in response to Doc.# DSDB-HV9931DB1 A032713 The design exercise of an HV9931 LED driver revolves around establishing component values for (1) the input and 2 Supertex inc. www.supertex.com HV9931DB1 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. design tool is available in Mathcad form, based on behavioral 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. 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. 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. The design of an HV9931 based LED driver is not further discussed here, except for noting that a semi-automatic The Demoboard can be simplified significantly. Below is a schematic showing the essential elements of the driver. A Simplified Version of the Design Simplified Schematic Diagram F11 250mA AC2 L21 1mH L11 1mH C11 100nF 1 2 L31 560μH E31 47μF D31 STTH1L06A C BR11 RH06-T R37 6.8kΩ C21 100nF D42 STTH102A M31 SPA04N50C3 R51 196kΩ ZOV BZX84C43 1 R62 2.43kΩ THROV BT168GW ANO A R61 180mΩ C ROV 10kΩ CAT C37 100pF 4 Optional Output Overvoltage Protection L41 3.3mH D41 STTH1R06A + 3 C12 100nF AC1 D32 STTH1L06A 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 Contact Supertex Applications Engineering for guidance in simplifying the design or for adding functions such as triac dimmability. versions, are popular for their ready availability and low cost. Drum core styles have particularly simple construction and 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. Note on Inductors: 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 Doc.# DSDB-HV9931DB1 A032713 3 Supertex inc. www.supertex.com Doc.# DSDB-HV9931DB1 A032713 AC1 AC2 F11 250mA 4 R82 24.3kΩ R83 1MΩ R84 1MΩ C12 100nF Q82 MMBT2907A MOV11 C11 275V 100nF L11 1mH C81 10nF 2 TVS11 SMAJ 440CA 1 R80 100kΩ Q81 MMBT2222A R81 10kΩ 3 1 REC BR11 RH06-T DN65 BAV99 C65 10µF 2 4 3 L21 1mH L1D R68 1MΩ R88 10MΩ R87 200kΩ 2 R37 6.8kΩ IC51 Q84 MMBT2907A VDD 6 3 C51 10µF HV9931 VDD ENA R51 196kΩ GATE 4 GATE CS2 8 5 PWM RT D42 MMDB914 7 L41 3.3mH R90 150kΩ C72 100pF R79 100Ω D42 STTH102A SN2 D79 MMBD914 D31 STTH1R06A M31 SPA04N50C3 R31 1MΩ + E31 47μF GND CS1 VIN 1 IDD R39 100Ω C37 100pF D31 STTH1L06A R99 1kΩ C62 100pF R62 2.43kΩ R86 100kΩ Q83 MMBT2222A R85 100kΩ Z61 BZX84C7V5 R63 75kΩ R64 634kΩ R65 634kΩ R61 180mΩ RS1 C21 100nF D37 STTH1L06A L31 560μH D32 STTH1L06A R73 75kΩ R72 2.67kΩ R71 680mΩ RS2 C41 10nF Z90 BZX84C7V5 Z91 BZX84C47 GND2 GND1 ANO CAT HV9931DB1 Schematic Diagram Supertex inc. www.supertex.com HV9931DB1 Typical Characteristics String Current [mA] vs. String Voltage [V] 1000 100 900 90 800 80 700 70 135VRMS 600 60 120VRMS 500 50 400 40 300 30 200 (100VRMS, 120VRMS, 135VRMS) virtually the same 20 100VRMS 100 0 Efficiency [%] vs. String Voltage [V] 10 0 10 20 30 40 0 50 0 10 20 30 40 50 THD [%] vs. String Voltage [V] PF [%] vs. String Voltage [V] 100 30 90 25 80 135VRMS 70 20 120VRMS 60 100VRMS 50 15 40 100VRMS 10 30 20 120VRMS 135VRMS 5 10 0 0 Doc.# DSDB-HV9931DB1 A032713 10 20 30 40 0 50 5 0 10 20 30 40 50 Supertex inc. www.supertex.com HV9931DB1 Typical Waveforms (1) Line Voltage and Current at nominal load (350mA, 40V) 100VRMS 120VRMS 135VRMS IAC VAC Line Voltage and Current at half load (350mA, 20V) 100VRMS 120VRMS 135VRMS Output Current and Drain Voltage at nominal load (350mA, 40V) ILED (Peak) VDRAIN ILED (Valley) Output Current and Drain Voltage at half load (350mA, 20V) Doc.# DSDB-HV9931DB1 A032713 6 Supertex inc. www.supertex.com HV9931DB1 Typical Waveforms (2) (120VRMS, 40V, 350mA) Drain Voltage and LED Current 400µs per div 40µs per div 4µs per div ILED 350mAAVE VDRAIN Drain Voltage and Gate Voltage 4µs per div 40µs per div 40µs per div VGATE Turn-ON Turn-OFF Recovery of D42 Recovery of D41 VDRAIN Drain Voltage and Current Sense Voltages of Stages 1 and 2 VRS1 VRS2 Recovery of D41 Recovery of D42 VDRAIN Drain Voltage and Voltages at Test Points REC, SN3, SN2 VSN3 VREC Doc.# DSDB-HV9931DB1 A032713 7 VSN2 Supertex inc. www.supertex.com HV9931DB1 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-HV9931DB1 A032713 8 Supertex inc. www.supertex.com HV9931DB1 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 56 60 50dBµV 10kHz 100kHz 10MHz 1MHz With shielding : 110dBµV 100dBµV 90 80 66 56 60 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-HV9931DB1 A032713 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 HV9931DB1 Mathcad Design Data Corner x 0 0 1 2 3 4 5 6 7 8 Corner L1 µH 0 616 560 504 616 560 504 616 560 504 L1 - - - - RL1 mR 0 2000 2000 2000 2000 2000 2000 2000 2000 2000 RL1 - - - - L2 mH 0 3300 3300 3300 3300 3300 3300 3300 3300 3300 L2 - - - - RL2 mR 0 3000 3000 3000 3000 3000 3000 3000 3000 3000 RL2 - - - - ILRF2 % 0 32 32 32 32 32 32 32 32 32 ILRF2 - - - - C2 uF 0.0 37.6 47.0 56.4 37.6 47.0 56.4 37.6 47.0 56.4 C2 - - - - NF x 0 2 2 2 2 2 2 2 2 2 NF - - - - LF µH 0 1000 1000 1000 1000 1000 1000 1000 1000 1000 LF - - - - RLF mR 0 2000 2000 2000 2000 2000 2000 2000 2000 2000 RLF - - - - CF nF 0 100 100 100 100 100 100 100 100 100 CF - - - - C1 nF 0 100 100 100 100 100 100 100 100 100 C1 - C2V 135 - RS mR 0 1000 1000 1000 1000 1000 1000 1000 1000 1000 RS - C2R 1345 - VD mV 0 1000 1000 1000 1000 1000 1000 1000 1000 1000 VD - - - - TF us 0.0 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 8.7 TF - - - - RT kR 0 196 196 196 196 196 196 196 196 196 RT - - - - FM Hz 0 50 50 50 50 60 50 50 50 50 FM - - - - VMRMS V 0 100 100 100 120 120 120 135 135 135 VMRMS - - - - IMRMS mA 0 167 160 153 137 133 130 122 118 115 IMRMS 130 137 115 167 IMMAX mA 0 246 232 221 200 191 185 176 169 163 IMMAX 185 200 163 246 V3AVG V 0 40 40 40 40 40 40 40 40 40 V3AVG 40 40 40 40 I3AVG mA 0 361 350 335 361 350 339 361 350 339 I3AVG 339 361 335 361 PM W 0.0 16.5 15.9 15.3 16.3 15.8 15.5 16.2 15.8 15.3 PM 15.5 16.3 15.3 16.5 P3 W 0.0 14.4 14.0 13.4 14.4 14.0 13.6 14.4 14.0 13.6 P3 13.6 14.4 13.4 14.4 EFF % 0.0 87.5 88.0 87.8 88.7 88.5 87.7 88.9 88.7 88.3 EFF 87.7 88.7 87.5 88.9 PF % 0.0 98.7 99.3 99.6 98.9 99.3 99.5 98.8 99.1 99.3 PF 98.9 99.5 98.7 99.6 THD % 0.0 9.0 5.3 3.3 6.4 3.8 2.5 5.1 3.1 2.1 THD 2.5 6.4 2.1 9.0 H3 % 0.0 8.7 5.1 3.1 6.2 3.6 2.3 5.0 2.9 1.9 H3 2.3 6.2 1.9 8.7 H5 % 0.0 1.7 1.0 0.7 1.1 0.7 0.6 0.8 0.6 0.5 H5 0.6 1.1 0.5 1.7 TAMIN µs 0.0 4.6 4.8 4.8 3.7 3.9 3.9 3.2 3.4 3.4 TAMIN 3.7 3.9 3.2 4.8 TAMAX µs 0.0 5.8 5.4 5.2 4.3 4.2 4.2 3.7 3.6 3.6 TAMAX 4.2 4.3 3.6 5.8 TFMIN µs 0.0 7.0 8.7 10.5 7.0 8.7 10.5 7.0 8.7 10.5 TFMIN 7.0 10.5 7.0 10.5 TFMAX µs 0.0 7.0 8.7 10.5 7.0 8.7 10.5 7.0 8.7 10.5 TFMAX 7.0 10.5 7.0 10.5 DAMIN % 0.0 39.6 35.5 31.6 34.7 30.8 27.4 31.8 28.0 24.7 DAMIN 27.4 34.7 24.7 39.6 DAMAX % 0.0 45.3 38.4 33.1 38.3 32.6 28.4 34.5 29.4 25.5 DAMAX 28.4 38.3 25.5 45.3 DC1MAX % 0.0 98.6 79.7 65.2 87.1 70.0 57.7 80.4 64.3 52.4 DC1MAX 57.7 87.1 52.4 98.6 FSMIN kHz 0.0 78.4 70.6 63.9 88.4 77.3 68.4 93.9 81.0 71.2 FSMIN 68.4 88.4 63.9 93.9 FSMAX kHz 0.0 86.5 74.0 65.4 93.6 79.4 69.4 97.8 82.6 71.9 FSMAX 69.4 93.6 65.4 97.8 Doc.# DSDB-HV9931DB1 A032713 10 Supertex inc. www.supertex.com HV9931DB1 Mathcad Design Data (cont.) Corner x 0 0 1 2 3 4 5 6 7 8 Corner IL1RMS mA 0 428 426 423 383 384 388 359 361 363 IL1RMS 383 388 359 428 IL1MAX mA 0 1121 1233 1345 1063 1184 1318 1036 1161 1291 IL1MAX 1063 1318 1036 1345 IL2RMS mA 0 362 351 338 362 351 341 362 351 341 IL2RMS 341 362 338 362 IL2MAX mA 0 406 406 406 406 406 406 406 406 406 IL2MAX 406 406 406 406 I2RMS mA 0 389 367 345 356 337 322 337 319 304 I2RMS 322 356 304 389 V2MIN V 0 94 110 127 111 130 149 123 144 166 V2MIN 111 149 94 166 V2MAX V 0 107 119 134 122 137 154 133 151 171 V2MAX 122 154 107 171 V2RELPPR % 0.0 13.1 7.9 4.8 9.7 5.8 3.7 8.1 4.8 3.0 V2RELPPR 4 10 3 13 ISRMS mA 0 504 492 480 455 446 442 428 420 414 ISRMS 442 455 414 504 ISMAX mA 0 1526 1639 1750 1469 1590 1723 1442 1567 1696 ISMAX 1469 1723 1442 1750 VSMAX V 0 241 254 270 285 301 319 317 336 357 VSMAX 285 319 241 357 IDL1AVG mA 0 300 271 245 253 229 211 228 206 188 IDL1AVG 211 253 188 300 IDF1AVG mA 0 152 128 108 131 111 96 120 101 86 IDF1AVG 96 131 86 152 IDR2AVG mA 0 152 129 108 131 111 94 119 100 85 IDR2AVG 94 131 85 152 IDF2AVG mA 0 209 221 227 230 239 244 242 250 254 IDF2AVG 230 244 209 254 IRS1RMS mA 0 295 303 310 260 270 282 242 252 262 IRS1RMS 260 282 242 310 IRS2RMS mA 0 235 213 192 218 198 180 208 188 171 IRS2RMS 180 218 171 235 Doc.# DSDB-HV9931DB1 A032713 11 Supertex inc. www.supertex.com HV9931DB1 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-HV9931DB1 A032713 Line Current 12 Supertex inc. www.supertex.com HV9931DB1 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% 100NF EPCOS Inc B32921C3104M 1 D42 DIODE ULTRAFAST 200V 1A SMA STMicroelectronics STTH102A 3 D31, D32, D37 DIODE FAST 600V 1A SMA STMicroelectronics STTH1L06A 1 D41 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 RAD12X20 200V 20% 47µF Panasonic ECG EEU-ED2D470 1 F11 FUSE SLOW IEC TR5 250MA Littelfuse Wickmann 37202500411 0 HS HEATSINK TO220 W/TAB W86 D40 H75 21K Aavid Thermalloy 574502B03700G 1 IC51 IC HV9931 LED DRIVER 8L SOIC Supertex HV9931LG-G 2 L11, L21 CHOKE SH RAD13MM 15% 1.0MH 820MA Sumida RCP1317NP-102L 1 L31 CHOKE RAD 450D 710L 10% 560µH Renco RL-5480-4-560 1 L41 CHOKE RAD 625D 700L 10% 3.3MH Renco RL-5480-5-3300 1 M31 MOSFET N-CH 560V 4.5A 0.95R TO-220FP Infineon Technologies SPA04N50C3 1 MOV11 MOV 10MM 430VDC 2500A ZNR Panasonic ECG ERZ-V10D431 2 Q81, Q83 TRANSISTOR GP NPN SOT-23 Fairchild Semiconductor MMBT2222A 2 Q82, Q84 TRANSISTOR GP PNP SOT-23 Fairchild Semiconductor MMBT2907A 2 R90, 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% 24.3KΩ Panasonic ECG ERJ-6ENF2432V 1 R63, R73 RES 1/8W 0805 1% 75.0KΩ Panasonic ECG ERJ-6ENF7502V 2 R80, R85, R86 RES 1/8W 0805 1% 100KΩ Panasonic ECG ERJ-6ENF1003V 1 R90 RES 1/8W 0805 1% 150KΩ Panasonic ECG ERJ-6ENF1503V 1 R51 RES 1/8W 0805 1% 196KΩ Panasonic ECG ERJ-6ENF1963V 1 R87 RES 1/8W 0805 1% 200KΩ Panasonic ECG ERJ-6ENF2003V 2 R64, R65 RES 1/8W 0805 1% 634KΩ Panasonic ECG ERJ-6ENF6343V Doc.# DSDB-HV9931DB1 A032713 13 Supertex inc. www.supertex.com HV9931DB1 Bill of Materials (cont.) Qty REF Description Manufacturer Product Number 3 R68, R83, R84 RES 1/8W 0805 1% 1.0MΩ Panasonic ECG ERJ-6ENF1004V 1 R88 RES 1/8W 0805 1% 10.0MΩ Vishay/Dale CRCW080510M0FKEA 1 R37 RES 1/4W 1206 5% 6.8KΩ Panasonic ECG ERJ-8GEYJ682V 1 R31 RES 1/4W 1206 5% 1.0MΩ Panasonic ECG ERJ-8GEYJ105V 1 R61 RES 1/4W 0805 1% .18Ω Susumu Co Ltd RL1220S-R18-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-HV9931DB1 A032713 14 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com