Supertex inc. HV9961DB1 21-Watt Universal AC LED Driver Demoboard with Accurate Average-Mode Constant Current Control General Description The HV9961 demoboard is a high-brightness LED driver employing the patent-pending average-mode constant current control scheme by Supertex Inc. The power conversion stage of the HV9961DB1 consists of a diode bridge rectifier followed by a buck converter operating with fixed off-time of 20µs. The HV9961DB1 LED driver features tight regulation of the LED current within a few milliamps over the entire range of the input AC line and the output LED string voltage. The LED current accuracy is almost insensitive to the passive component tolerances, such as the output filter inductance or the timing resistor. The accuracy of the LED current is mainly determined by the internal 275mV ± 3% reference voltage of the HV9961 control IC and by the external current sense resistor tolerance. The output current can be adjusted down to 60mA using an on-board potentiometer. However, the accurate current control is only achieved with continuous conduction of the filter inductor, i.e. when the LED current is greater than the inductor ripple current amplitude. (Note, that the linear dimming input of the HV9961 disables switching, when its voltage falls below a 200V threshold. Expect the LED driver to shut off when the LED current falls below 50 ~ 55mA.) PWM dimming can be achieved by applying a pulse-widthmodulated square wave signal between the PWMD and GND pins. The HV9961DB1 features protection from an output short circuit condition. Open LED protection is inherent, since the output filter capacitor can accept the full rated rectified AC line voltage. Please, note that the demoboard is not CISPR15 compliant. An additional input EMI filter circuit is required to make the board meet conducted electro-magnetic emission limits. Also, note that: NO SAFETY ISOLATION OF THE LED LOAD FROM THE AC MAINS VOLTAGE IS PROVIDED! Connection Diagram WARNING!!! Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the instrument and/or the HV9961DB1. Use floating high voltage differential probes or isolate the demoboard by using an isolating transformer. 20-60V 350mA 90-265VAC 50/60Hz Connections 0 -1.5V for LD function or leave open WARNING!!! No galvanic isolation. Dangerous voltages are present when connected to the AC line. 1. Connect the input AC voltage between the AC IN terminals as shown in the connection diagram. 3. Connect the PWMD terminal to the VDD terminal using the jumper provided to enable the LED driver. 2. Connect the LED string between LED+ (anode of LED string) and LED- (cathode of LED string). 4. The current level can be adjusted by applying 0 1.5V between LD and GND. Leave LD floating to use the internal current setting. Doc.# DSDB-HV9961DB1 A032913 Supertex inc. www.supertex.com HV9961DB1 PWM Dimming to the PWM dimming source and/or the HV9961DB1. One simple way is to isolate the LED driver from the AC line using an isolation transformer. Another approach is to use an optoisolator to drive the PWMD pin as shown in the figure below. The HV9961DB1 is capable of being PWM dimmed by applying a square wave TTL compatible signal between PWMD and GND terminals. However, since there is no galvanic isolation on the board, care must be taken to prevent damage 3.8kΩ VDD 5.0V square wave signal (<1.0kHz) Opto-isolator PWMD (e.g. LTV-814 from Lite-On) Specifications Parameter Value Condition 90~265VAC, 50/60Hz --- 20~60V --- 350mA±4% --- ±15% (typical, depending on the type of LED) 120VAC, 60V/350mA 92% 120VAC, 60V/350mA 91% 240VAC, 60V/350mA 0.56 120VAC, 60V/350mA 0.50 240VAC, 60V/350mA 0.27A (RMS) 90VAC, 60V/350mA 29kHz 120VAC, 60V/350mA 38kHz 240VAC, 60V/350mA 40kHz 120VAC, 20V/350mA 43kHz 240VAC, 20V/350mA Open LED Protection YES Recovery upon power reset Output Short Circuit Protection YES --- 68.6mm X 49.6mm --- Input Voltage Output Voltage Nominal Output Current Output Current Ripple Full Load Efficiency Power Factor Max. Input Current Switching Frequency (variable, TOFF = 20µs) Dimensions Doc.# DSDB-HV9961DB1 A032913 2 Supertex inc. www.supertex.com HV9961DB1 Typical Characteristics Current Regulation vs. LED String Voltage 0.362 0.45 0.360 LED Current, A LED Current (A) Output Short Circuit Response 0.50 0.364 0.358 0.356 0.354 240VAC 0.352 0.40 240VAC 0.35 120VAC 0.30 0.350 0.25 120VAC 0.348 0.346 10 20 30 40 50 60 0.20 70 0 10 20 0.370 30 40 50 60 70 Output Voltage (V) Output Voltage (V) Current Regulation vs. AC Line Voltage Efficiency 95% 60V 0.365 0.360 Efficiency (%) LED Current (A) 90% VO = 20V 0.355 VO = 60V 0.350 85% 20V 80% 0.345 0.340 110 60 160 210 260 75% 310 60 110 160 210 260 310 AC Line Voltage (VAC) AC Line Voltage (VAC) PWM Dimming Response Short Circuit Current VIN = 240VAC ILED PWMD Doc.# DSDB-HV9961DB1 A032913 3 Supertex inc. www.supertex.com HV9961DB1 Schematic F1 J1 1 2 RT1 U1 2.0A 250VAC C4 0.1µF 305VAC AC1 POS AC2 NEG 12 J4 C8 2.2µF 16V R2 100kΩ 13 9 C6 0.1µF C3 0.47µF 400V C1 47µF 400V U2 J3A J2 CL-140 1 VIN VDD HV9961 RT GATE CS PWMD 14 5 2 3 J3B J3C 1 2 2 R1 464kΩ 8 Q1 STD5NM50 4 GND R5 1.0kΩ L1 C5 0.47µF 400V 4.7mH RL-1292-4700 1 LD D1 STTH2R06U C7 (not used) R4 0Ω R6 0.82Ω R6a 15Ω Silk Screen Doc.# DSDB-HV9961DB1 A032913 4 Supertex inc. www.supertex.com HV9961DB1 Bill of Materials Item # Quan RefDes Description Package Manufacturer Manufacturer’s Part Number 1 1 C1 47µF, 400V electrolytic capacitor Radial Panasonic EEU-ED2G470 2 2 C3,C5 0.47µF, 400V metal film capacitor Radial EPCOS Inc B32522C6474K 3 1 C4 0.1µF, 305VAC EMI suppresion capacitor Radial EPCOS Inc B32922C3104M 4 1 C6 0.1µF, 16V X7R ceramic chip capacitor SMD0805 Panasonic ECJ-2VB1C104K 5 1 C8 2.2µF, 16V X7R ceramic chip capacitor SMD0805 TDK Corp C2012X7R1C225K 6 1 D1 600V, 2A ultrafast diode SMB ST Micro STTH2R06U 7 1 F1 2.0A, 250VAC time lag fuse Radial Cooper Bussman SR-5-2A-BK 8 1 H1 15C/W DPAK heat sink SMT Aavid 7106PD 9 2 J1,J2 2 position, 0.156” pitch, vertical header Thru-Hole Molex 26-48-1021 10 1 J3 3 position, 0.100” pitch, vertical header Thru-Hole Molex 22-03-2031 11 1 L1 4.7mH, 400mA rms, 470mA SAT inductor Axial Renco USA RL-1252-4700 12 1 Q1 550V, 0.7Ω N-channel FET DPAK ST Micro STD5NM50 13 1 RT1 50Ω NTC inrush limiter Thru-Hole GE Sensing CL-140 14 1 R1 464KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 15 1 R2 100KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 16 1 R5 1.0KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 17 1 R6 0.82Ω, 1/4W, 1% chip resistor SMD1206 --- --- 18 1 R6a 15Ω, 1/4W, 1% chip resistor SMD1206 --- --- 19 1 U1 400V, 1.0A single phase diode bridge DF-S Diodes Inc DF04S 20 1 U2 Universal LED Driver SO-16 Supertex HV9961NG-G 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-HV9961DB1 A032913 5 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com