Supertex inc. HV9861ADB1 21-Watt, Universal, AC LED Driver Demoboard with Accurate Average-Mode, Constant Current Control General Description The HV9861ADB1 demoboard is a high-brightness LED driver employing the patented average-mode, constant current control scheme by Supertex Inc. The power conversion stage of the HV9861ADB1 consists of a diode bridge rectifier followed by a buck converter operating with fixed off-time of 20µs. The HV9861ADB1 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 270mV ± 3% reference voltage of the HV9861A control IC and by the external current sense resistor tolerance. (Note, that the linear dimming input of the HV9861A disables switching, when its voltage falls below a 200mV threshold. Expect the LED driver to shut off when the LED current falls below 50 ~ 55mA.) Connection Diagram PWM dimming can be achieved by applying a pulse-widthmodulated square wave signal between the PWMD and GND pins. The HV9861ADB1 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! Silk Screen 20-60V 350mA 90-265VAC 50/60Hz 0 -1.5V for LD function or leave open WARNING!!! Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the instrument and/or the HV9861ADB1. Use floating high voltage differential probes or isolate the demoboard by using an isolating transformer. Connections 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-HV9861ADB1 A032713 Supertex inc. www.supertex.com HV9861ADB1 PWM Dimming 3.8kΩ The HV9861ADB1 is capable of being PWM dimmed by applying a square wave TTL compatible signal between PWMD and 5.0V GND terminals. However, since there is no galvanic isolation square wave on the board, care must be taken to prevent damage to the signal PWM dimming source and/or the HV9861ADB1. One simple (<1.0kHz) way is to isolate the LED driver from the AC line using an isolation transformer. Another approach is to use an opto-isolator to drive the PWMD pin as shown in the following figure. VDD PWMD Opto-isolator (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 --- 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 Maximum input current Switching frequency (variable, TOFF = 20µs) Dimensions Schematic F1 J1 1 2 RT1 U1 2.0A 250VAC C4 0.1µF 305VAC CL-140 AC1 POS AC2 NEG J2 C3 0.47µF 400V C1 47µF 400V C5 0.47µF 400V D1 STTH2R06U 1 L1 1 2 2 4.7mH RL-1292-4700 J3.1 HV9861A R2 100kΩ PWMD CS GND R5 1kΩ C7 (not used) J3.2 Q1 STD5NM50 GATE LD C6 0.1µF Doc.# DSDB-HV9861ADB1 A032713 RT VDD J3.3 C8 2.2µF 16V R1 464kΩ VIN R4 0Ω R6 0.82Ω R6a 15Ω J3.4 2 Supertex inc. www.supertex.com HV9861ADB1 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 Current Regulation vs. AC Line Voltage 60 70 Efficiency 95% 60V 0.365 90% Efficiency (%) LED Current (A) 50 Output Voltage (V) Output Voltage (V) 0.360 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-HV9861ADB1 A032713 3 Supertex inc. www.supertex.com HV9861ADB1 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 4 position, 0.100” pitch, vertical header Thru-Hole Molex 22-03-2041 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 1kΩ, 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, 1A single phase diode bridge DF-S Diodes Inc DF04S 20 1 U2 Universal LED Driver SO-16 Supertex HV9861ANG-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-HV9861ADB1 A032713 4 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com