Supertex inc. HV9910BDB1 Off-Line, High Brightness, 1.4A LED Driver Demo Board General Description The HV9910BDB1 demoboard is an offline, high current LED driver designed to drive a 40V LED string at 1.4A from a 110V input. The demoboard uses Supertex’s HV9910B LED driver IC to drive a buck converter. Specifications Input voltage 90 - 135Vrms, 50/60Hz Output voltage 10 - 40V Output current 1.4A max The HV9910BDB1 has a typical full load efficiency of 88%, with the buck converter efficiency (excluding the diode bridge rectifier and EMI filter) at 93%. The demoboard also meets CISPR-15 conducted EMI standards. Output current ripple (typ) The output current can be adjusted in two ways - either with linear dimming using the onboard potentiometer or with PWM dimming by applying a TTL-compatible square wave signal at the PWMD terminal. Using linear dimming, the output current of the HV9910DB1 can be lowered to about 0.1A (note: zero output current can be obtained only by PWM dimming). Input current THD (@110V) 40% (peak-peak) Full load efficiency (@110V) 88% Power factor (@110V) 0.64 Input current (@110V) 0.83A rms 117% Switching frequency (typ) 50kHz Minimum output current (@110V) 0.1A Conducted EMI Meets CISPR-15 Temperature rise of heatsink (@110V input and full load) 50°C Open LED protection yes Output short circuit protection Dimensions no 86.4mm X 58.4mm Connection Diagram 10 - 40V, 1.4A max. 90 - 135VAC 50/60Hz WARNING!!! Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the instrument and/or the HV9910BDB1. Use floating high voltage differential probes or isolate the demoboard by using an isolating transformer. There is no galvanic isolation. Dangerous voltages are present when connected to the AC line. Doc.# DSDB-HV9910BDB1 A032813 Supertex inc. www.supertex.com HV9910BDB1 Connections 1. Connect the input AC voltage between the AC IN terminals as shown in the connection diagram. 2. Connect the LED string between LED+ (anode of LED string) and LED- (cathode of LED string). 3. Connect the PWMD terminal to the VDD terminal using the jumper provided to enable the LED driver. 4. The current level can be adjusted using the on-board potentiometer. PWM Dimming The HV9910BDB1 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 to the PWM dimming source and/or the HV9910BDB1. One simple 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 figure below. 3.8kΩ VDD 5.0V square wave signal (<1.0kHz) Opto-isolator (eg: LTV-814 from Lite-On) PWMD Typical Results Full Load Efficiency vs. Input Voltage 89 Efficiency vs. Load Voltage (@VIN=110V rms) 90 Efficiency (%) Efficiency (%) 86 88 82 87 78 86 90 100 110 120 130 74 140 5 15 Change in output current (%) Change in output current (%) 15 2.5 0 -2.5 -5 90 100 110 120 130 45 12.5 10 7.5 5 2.5 0 140 Input Voltage (Vrms) Doc.# DSDB-HV9910BDB1 A032813 35 Load Regulation of Load Current (@ VIN = 110V rms) Line Regulation of Load Current 5 25 Load Voltage (V) Input Voltage (Vrms) 5 15 25 35 45 Load Voltage (V) 2 Supertex inc. www.supertex.com HV9910BDB1 Waveforms Drain Voltage Input Voltage Input Current LED Current Steady State waveforms at 150Vdc input and full load output Steady State waveforms at 150Vdc input and full load output PWMD Voltage PWMD Voltage LED Current LED Current PWM Dimming at 100Hz Rising Edge of LED Current during PWM Dimming PWMD Voltage LED Current Falling Edge of LED Current during PWM Dimming Doc.# DSDB-HV9910BDB1 A032813 3 Supertex inc. www.supertex.com HV9910BDB1 Conducted EMI Measurements at Full Load and 110V AC input CISPR-15 Limit Silk Screen Doc.# DSDB-HV9910BDB1 A032813 4 Supertex inc. www.supertex.com 5 J1 2 1 1 MOV1 R ERZ-V05D221 F1 2A 125V 4 C4 0.1µF 250V 3 2 L2 4 1 C5 0.1µF 250V 1 4 + 2- Doc.# DSDB-HV9910BDB1 A032813 t 3 D2 DF1504S-T RT1 CL-130 C3 68µF 200V C7 68µF 200V R3 5k C6 2.2µF 16V 0 C1 1.0µF 250V R6 1k L3 1 J3A 22µH R2 178k 1 VIN 1 RT J3C J3B 0 5 CS GATE PWMD GND LD HV9910B VDD U1 3 R5 1k 9 13 12 0 C10 1.0µF 250V 2 C8 0.1µF 16V 2 4 8 14 R7 0.27 0.25W R4 0.0 C1 1.0µF 250V R1 464k 2A 1000µH L1 R7 0.27 0.25W Q1 FQD8N25 1 D1 MURS240 2 C2 0.47µF 250V J2 1 2 HV9910BDB1 Schematic Diagram Supertex inc. www.supertex.com HV9910BDB1 Bill of Materials Item # Qty RefDes Description Package Manufacturer Manufacturer’s Part Number 1 2 C1, C10 1µF, 250V metallized polyester capacitor Radial EPCOS Inc B32522C3105J 2 1 C2 0.47µF, 250V metallized polyester capacitor Radial EPCOS Inc B32521C3474J 3 2 C3, C7 68µF, 250V electrolytic capacitor Radial Panasonic EEU-EE2D680 4 2 C4, C5 0.1µF, 250V metallized polyester X2 capacitor Radial Panasonic ECQ-U2A104MV 5 1 C6 2.2µF, 16V, X7R ceramic chip capacitor SMD0805 --- --- 6 1 C8 0.1µF, 50V, X7R ceramic chip capacitor SMD0805 --- --- 7 1 C9 open --- --- --- 8 1 D1 400V, 2A ultra fast recovery diode SMB ON Semi MURS240T3 9 1 D2 400V, 1.5A single phase diode bridge DF-S Diodes Inc DF1504S-T 10 1 F1 2A, 125V slow blow fuse SMT Littelfuse Inc 0452002.MRL 11 2 J1, J2 2 position 0.156” header Thru-Hole Molex 26-48-1021 12 1 J3 3 position, 0.1” pitch vertical header Thru-Hole Molex 22-28-4030 13 1 L1 1000µH, 2A rms, 2A sat inductor Radial Coilcraft PCV-2-105-02L - - --- Cross Reference Radial Coiltronics CTX01-17784G-R 14 1 L2 0.6mH, 1A rms common mode choke Thru-Hole Coilcraft BU9-6011R0BL 15 1 L3 22µH, 2.1A sat, 1.9A rms inductor Radial Coilcraft RFB0807-220L 16 1 MOV1 220V, 600A surge absorber Radial Panasonic ERZ-V05D221 17 1 Q1 250V, 0.55Ω, N-channel FET DPAK Fairchild Semi FQD8N25 18 1 RT1 2A rms, 50Ω inrush current limiter Radial GE Sensing CL-130 19 1 R1 464KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 20 1 R2 178KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 21 1 R3 5KΩ 6mmsq single turn potentiometer SMT Bourns Inc 3361P-1-502GLF 22 1 R4 0.0Ω, 1/8W chip resistor SMD0805 --- --- 23 2 R5, R6 1KΩ, 1/8W, 1% chip resistor SMD0805 --- --- 24 2 R7, R8 0.27Ω, 1/4W, 1% chip resistor SMD1206 --- --- 25 1 U1 SO-16 Supertex HV9910BNG-G Universal LED Driver 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-HV9910BDB1 A032813 6 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com