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| HV9906DB2 Off-Line Current Source Controller Introduction The Supertex HV9906DB2 demo board contains all circuitry necessary to demonstrate the features of the HV9906 second order power supply controller. The power converter of the demo board consists of an input buck-boost stage and an output buck stage. The output voltage polarity is negative. Due to its unique quadratic input-to-output DC voltage transfer ratio, the converter can operate directly off AC line to produce low-voltage output without need for electrolytic capacitors. HV9906 is designed for optimal controlling this type of power converter or other types of two-stage multi-converters. The board is optimized for driving a 6V 400mA (700mA max.) LED. However, it may be modified to meet custom requirements. Specification Input Voltage Output Current Output Voltage Efficiency 80 to 135VAC, 60Hz 400mA 10% (700mA max.) 10V max. 62% at Io=500mA, Vin=100VAC Board Layout and Connections WARNING!!! Do not connect to scope ground or to the ground of other earth-grounded instruments. Doing so will short the AC line, resulting in damage to the circuit and/or instruments. Either use an isolation transformer on the AC line, use a differential probe, or use a floating, battery-powered instrument to make measurements. WARNING!!! No galvanic isolation. Dangerous voltages are present when connected to the AC mains. 1 07/23/02 Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com HV9906DB2 Instructions NEG, RTN Connect your LED to these terminals: negative to NEG, positive to RTN. E1, E2 Connect 80 to 135VAC, 60Hz line source to these terminals: line to E1, neutral to E2. The input is protected with a 0.5A fuse. IMPORTANT: Make sure that your LED is connected to NEG and RTN terminals. There is no open circuit protection available in this demo board. Contact Supertex, Inc. for the application circuit if protection is required. GND This is circuit common. Note that since galvanic isolation is not provided, connecting this point to an earth-grounded instrument (such as an oscilloscope) will short the AC line, resulting in circuit and/or instrument damage. Also note that GND may be at higher potential with respect to earth ground, even if the AC is switched off. Use caution! Do not connect to earth-ground. Setting Output Current Output current is preset to 400mA for this board. Output current can be re-programmed according to the following equation: R6 - R7 1V R 7 R3 Iout = The average output current will come out 5-10% smaller due to power transfer interruptions during the AC line voltage cusps. Schematic Diagram D5 B1 D1 F1 100uH E1 1/2A S 4 0 F D D6 L3 D2 MURS160 L2 0.033 C3 MURS120 100uH NEG D7 M1 IRFR320 Q1 MURS120 .1 C2 R1 E2 D3 D4 22 LED1 LED MMBT2907 R4 976K 1 DUT 8 6 R6 RTN C5 0.1 R3 .47 2 121K 3 R5 12.1K HV9906 4 7 R7 5 100K C6 10uF 07/23/02 Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com 2 GND HV9906DB2 Parts List Item Reference 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 B1 C2 C3 C5 C6 D5 D6 D7 F1 L2 L3 M1 Q1 R1 R3 R4 R5 R6 R7 U1 Diode Bridge Cap, PEN Film 0.1uF 250V 0.1 uF, 50V, 10% 10 uF, 16V Tantalum Chip Diode, Ultra Fast, 600V 1A Diode, Ultra Fast, 200V 1A Diode, Ultra Fast, 200V 1A Fuse, 1/2A, Slow Blow 100uH, 1.7A 100uH, 1.2A MOSFET, 400V BJT, PNP 22 ohm, 1%, 1/8W 0.47 ohm, 1%, 1/4W 976K ohm, 1%, 1/8W 12.1K ohm, 1%, 1/8W 121K ohm, 1%, 1/8W 100K ohm, 1%, 1/8W PWM/PFM IC HV9906 Supertex, Inc. HV9906 MURS160T3 MURS120T3 MURS120T3 R452.500 DO3316P-104 IRFR320 MMBT2907 On Semi On Semi On Semi Littelfuse Coilcraft On Semi MURS160T3 MURS120T3 MURS120T3 R452.500 DO3316P-104 MMBT2907 Part Part Number DF04S ECW-U2104KC9 Manufacturer Diodes Inc. Panasonic Panasonic Part No. DF04S ECW-U2104KC9 ECW-U2333KC9 Cap, PEN Film 0.033uF 250V ECW-U2333KC9 CTCDRH127-101 Central Technologies CTCDRH127-101 International Rectifier IRFR320 3 07/23/02 Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com The Supertex SuperNova Powers the Luxeon Star Highlights: PCB Layout: 400mA (700mA when potted) Small 25mm x 25mm x 11mm size High reliability No electrolytic capacitors Operates directly off AC line (85VAC Fig. 2 - Bottom view Fig. 3 - Output Current (Vin = 120VDC) Fig. 4 - Output Current (Vin = 120AC) Waveform Summary: Fig. 3 shows continuous nature of the output current. Peak-to-average current ratio is close to unity. Fig. 4 shows that current drops out of regulation for short periods of time only during the AC line cusps. (Switching ripple component is attenuated for clarity.) Fig. 5 shows the input current nature. The converter delivers full output power to the output down to very low input voltage. Fig. 5 - Input Current and Voltage (Vin = 120VAC) |
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