HV9910DB1 HV9910B 90VAC 135VAC 120VAC FR1G-13 IRF840 BYV26B ED555/2DS

Off-Line, High Brightness, LED Driver Demo Board General Description The power conversion stage of HV9910DB1 consists of a

HV9910DB1 HV9910DB1 Off-Line, High Brightness, LED Driver Demo Board General Description The power conversion stage of HV9910DB1 HV9910DB1 consists of a passive power factor corrector circuit followed by a currentcontrolled buck converter operating at a switching frequency of 80kHz. The nominal output current of the demo board can be adjusted to any value between 350mA and 1.5A using the on-board trimming potentiometer. PWM dimming can be achieved by applying a pulse-width-modulated square wave signal between the PWMD and GND pins. The Supertex HV9910DB1 HV9910DB1 demo board is a complete high current, high brightness (HB) LED power driver to supply a string of LEDs using the HV9910B HV9910B IC. The demo board can be used to test the performance of the HV9910B HV9910B as a constant current driver to power a string or multiple strings of LEDs. HV9910DB1 HV9910DB1 can supply a maximum output current of 1.5A to drive LED strings that are 40V or less from a 120V, 60Hz input. It has an efficiency of about 90% at full load and operates typically at 85% input power factor. Specifications Input Voltage: 90VAC 90VAC 135VAC 135VAC Load current: 1500mA maximum (adjustable down to 350mA) LED string voltage: 40V maximum Switching Frequency: 50kHz Efficiency: 90% (typ.) Dimensions: 100.5mm x 57.5mm Board Layout and Connections 90-135Vac 60Hz Enable Connection PWM Dimming (optional) 1 HV9910DB1 HV9910DB1 Instructions AC Input: Connect these pins to a standard 120V line voltage outlet (or a DC voltage between 100 200V). Use a two-wire cable without ground connection. be connected to the negative output. Connect the AC input to the input terminals (there is no polarity to be considered). Short the PWMD pin to VDD. Apply a 120VAC 120VAC at input terminals and the LED string should start to glow. Note: Apply AC line voltage as a last step to power up LED string, after you connect LED to demo board! A disconnected LED string would not damage the board, however it is not advisable. An ammeter can be connected in series with the LEDs to measure the output current. The current level can then be changed by adjusting the trimming potentiometer. ATTENTION: The LED demo board and connected LEDs are not isolated from line voltage. None of the demo board terminals are galvanic isolated from the AC line voltage. All measuring instruments, as scopes and meters must be isolated from ground (floating) using isolating transformers. Note: Make sure the LED string is fully functional. One way is to use a DC current limited source to test the string. A 40V/300mA power supply should be a good solution. Open LED Test OUTPUT: These two terminals are the output terminals of the converter and must be connected to the LED string. Positive-marked end is to be connected to positive (anode) terminal of LED string, Negative-marked to be connected to the negative (cathode) terminal. After the initial test of functionality, the demo board can be tested at open LED string. The test is non-destructive and not time restricted. Disconnect one end of the LEDs and power up the demo. There will be no light emission and the AC current withdrawn from the line will be very low. There is no switching at the switching node. Note: Both terminals will have active live voltage when input AC line is applied! Linear Dimming Test Gradual change of current via LEDs is possible by using the trimming potentiometer R5 placed on the demo board. The HV9910B HV9910B has a preset voltage reference level of 250mV when the voltage at the LD pin of the IC is above 250mV. The external resistor divider consisting of R2, R3 and potentiometer R5 can change that level by pulling down the pin LD below 250mV, reducing the LED string current in linear fashion. VDD: This pin is connected to the VDD pin of the HV9910B HV9910B. The typical voltage on the pin is 7.6V. This voltage can be used to drive any additional circuitry required. Please see the datasheet regarding the output current capability at the VDD pin. GND: This pin is connected to the Ground connection of the buck converter. PWMD: This terminal can be used to either enable/disable the converter or to apply a PWM dimming signal. The maximum output current of the HV9910DB1 HV9910DB1 is 1.5A. It can be reduced using R5 or can be changed to ½ of it by removing one of the two current sense resistors R4 and R6. To just enable the converter, connect the PWMD pin to the VDD pin. Disconnecting the PWMD pin will cause the circuit to stop. PWM Dimming Test During normal demo board operation, by applying a PWM TTL level signal to pin PWMD, the output current through the LEDs can be changed in PWM fashion in a 0 to 100% range. In this dimming mode, the output current has normally two levels zero and nominal current, except at very low duty ratios where inductor current cannot ramp up to the nominal value within the short time. PWM dimming of the LED light can be achieved by turning on and off the converter with low frequency 50Hz to 1000Hz TTL logic level signal. Changing the Duty Ratio of the signal changes the effective average current via the LEDs, changing the light emission. Note: In the case of PWM dimming, the PWMD pin should not be connected to the VDD pin. Also, the signal generator or the device applying the signal to PWMD pin must be isolated from the input mains. Testing HV9910DB1 HV9910DB1 Connect the LED string to the output terminals. Check the polarity of the LED connection, anode end of the string should be connected to the positive output, cathode should 2 HV9910DB1 HV9910DB1 Schematic Diagram V+ V+ C11 C1 J11 1uF, 250V 100uF, 160V U3 U2 AC2 NEG C4 13 R5 9 2.2uF, 16V 5K C8 J16 J17 J18 VDD RT 14 Q5 HV9910B HV9910B R2 178K HD GATE J19 D19 FR1G-13 FR1G-13 100uF, 160V GND L1 D20 FR1G-13 FR1G-13 8 L2 VDS 1 2 1000uH, 2A EN C7 0.1uF, 25V CS 4 IRF840 IRF840 (D2PAK) 5 0.1uF, 250V R 12 POS 1 NTC1 2 2 AC1 C13 0.1uF, 250V C12 GND R3 1K PWMD 2A, 125V 1 4 3 AC INPUT 2 Conn_2pin R1 464K VIN F1 1 VDD D21 FR1G-13 FR1G-13 1 D18 BYV26B BYV26B R4 0.27 R6 0.27 Bill of Materials Qty Ref 2 J11, AC INPUT 2 C1, C8 1 Description Manufacturer Manufacturer's Part Number Terminal block Onshore Tech. ED555/2DS ED555/2DS 100µF, 160V electrolytic capacitor Panasonic EEU-EB2C101 EEU-EB2C101 C4 2.2µF, 16V SMD 0805 ceramic capacitor Panasonic ECJ-2FB1C225K ECJ-2FB1C225K 1 C7 0.1µF, 25V SMD 0805 ceramic capacitor Panasonic ECJ-2VF1E104Z ECJ-2VF1E104Z 1 C11 1µF, 250V metallized polypropylene capacitor Panasonic ECW-F2105JB ECW-F2105JB 2 C12, C13 0.1µF, 250V metallized polyester capacitors Panasonic ECQ-U2A104MV ECQ-U2A104MV 1 D18 3 D19, D20, D21 400V, 1.5A fast - soft recovery diode Philips BYV26B BYV26B 400V, 1A SMB fast recovery diode Diodes, Inc. FR1G-13 FR1G-13 1 F1 Slow Blo SMD 125V, 2A fuse Littelfuse Inc 0460002.UR 1 L1 Low profile common mode choke Coilcraft BU9-2820R5B BU9-2820R5B - - Cross reference for L1 Cooper Electronics CTX01-17785-R CTX01-17785-R 1 L2 1000µH, 2A inductor Coilcraft PCV-2-105-02 PCV-2-105-02 - - Cross reference for L2 Cooper Electronics CTX01-17784G-R CTX01-17784G-R 1 NTC1 NTC inrush current limiter Thermometrics CL-130 CL-130 1 Q5 500V, 8A D2PAK MOSFET International Rectifier IRF840AS IRF840AS 1 R1 464K, 1/8W 0805 SMD resistor Panasonic ERJ-6ENF4643V ERJ-6ENF4643V 1 R2 178K, 1/8W 0805 SMD resistor Panasonic ERJ-6ENF1783V ERJ-6ENF1783V 1 R3 2 R4, R6 1K, 1/10W 1/10W 0805 SMD resistor Panasonic ERJ-6ENF1001V ERJ-6ENF1001V 0.27, 1/4W 1210 resistor Panasonic ERJ-14RQJR27U ERJ-14RQJR27U 1 R5 Top adjust 5K trim pot BC components CT-94W-502 CT-94W-502 1 U1 Universal LED driver Supertex HV9910BNG-G HV9910BNG-G 1 U2 400V, 1A, DF-S, single phase diode bridge Diodes, Inc. DF04S DF04S D2PAK heat sink Aavid Thermalloy 573100d00000 3-position breakaway header Molex/Waldom 22-28-4030 1 - 1 VDD, PWMD, GND 3 HV9910DB1 HV9910DB1 Top Layer Bottom Layer 040108 4