AL9910EV5

AL9910EV5 BUCK LED DRIVER USER GUIDE Fig. 1 AL9910EV5 evaluation board connection diagram Issue 3 – June 2011 © Diodes Incorporated, 2011 www.diodes.com AL9910EV5 DESCRIPTION The AL9910EV5 is an offline non-isolated LED driver Evaluation board designed to work on both 115V and 230V AC line voltages. It provides a constant LED current output which drives a single string of between 14 and 18 LEDs, with a LED current of 240mA. The evalution board is designed with a footprint to fit iinside a T8 LED fluorescent replacement lamp tube. It will provide a total LED power ranging from 10W to 13W. AL9910EV5 SETUP AND TESTING PROCEDURE Prerequiste 1. AL9910EV5 evaluation board. 2. A set of 240mA LEDs strings with 14 to 18 series-connected LEDs. The LEDs should be mounted on a heatsink capable of a power dissipation of 10 to 13W. 3. For safety reasons during testing, please use an isolated 115V or 230V AC source from the output of an isolation tranformer. For public demonstration, the evaluation board and LEDs should be fitted into a transparent case with sufficient insulation to meet the local safety requirements. Connections and Power up 1. Preset the isolated AC source to either 115VAC or 230VAC. 2. ENSURE THAT THE AC SOURCE IS SWITCHED OFF OR DISCONNECTED. 3. Connect the anode wire of the LED string to the LED+ terminal which is located at the right hand side of evaluation board. 4. Connect the cathode wire of the LED string to the LED - terminal which is located at the right hand side of the evaluation board. 5. Connect a voltmeter & ammeter according to the connection diagram in Figure 1 if LED current and voltage measurements are required. 6. Connect the two AC line wires to the AC1 and AC2 terminals which are located at the left hand side of evaluation board. 7. Ensure that the area around the board is clear and safe, and preferably that the board and LEDs are enclosed in a transparent safety cover. 8. Turn on the mains switch. LED string should light up with LED current of 240mA +/-15%. DO NOT TOUCH THE BOARD, LEDs OR BARE WIRING. Caution: The AL9910EV5 is a non-isolated design. All terminals carry high voltage during operation! Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 2 AL9910EV5 OPERATION The AL9910A device is a PWM high-efficiency LED driver control IC. It allows efficient operation of High Brightness (HB) LEDs from voltage sources ranging from 85VAC up to 265VAC. The AL9910A can be configured to work in either fixed frequency or constant OFF-time mode. In fixed frequency mode, the AL9910A controls an external MOSFET at a fixed switching frequency up to 300kHz, which can be programmed using a single resistor. The LED string is driven at a constant current rather than at a constant voltage, thus providing constant light output and enhanced reliability. The output current can be programmed between a few milliamps and more than 1.0A. Input filter and Rectifier section In order to meet the EMI requirement, Cx1, Cx2, CX3, CX4, L1 and L2 are used to provide sufficient filtering for both differential-mode and common-mode noise generated from the switching converter circuit after the bridge rectifier. The rectified line voltage from the bridge rectifier DB1 is fed into a valley-filled passive power factor correction stage to provide a high power factor for the AC line input. The passive PFC stage comprises of C11, C2, D1, D2, D3 and R1. This design gives power factors of greater than 0.9 at low line voltage. Constant Current Buck Converter section The buck converter section consists of LED controller AL9910A (U1), Ultra-fast free-wheeling rectifier SF30JG (D4), Inductor (L3 and L4) and a high voltage MOSFET switch (Q1). On this evaluation board, the AL9910A is configured to operate in the constant OFF-time mode to provide the best LED current regulation. The constant OFF-time of the AL9910A’s gate output is set to approximately 14µs using resistor R9. Please refer to the product datasheet for more details on how to configure the constant OFF-time mode. The circuit values have been designed to provide an output current of 240mA. The LED current level is set by resistors R5-R7. For detailed applications information please refer to the AL9910/A datasheet. There is also provision for an optional gate transistor pair (Q2) to drive a MOSFET with a higher gate charge if a higher LED current is required. Q2 is a high current gate driver in a SOT23-6 package. Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 3 AL9910A AL9910EV5 Fig. 2 AL9910EV5 Schematic Diagram Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 4 AL9910EV5 PARTS LIST Ref U1 D1 D2 D3 D4 DB1 C1 C2 C3 C6 C4 C5 CX1 CX2 CX3 CX4 F1 JP1 L1 L2 L3 L4 MOV1 NTC1 Q1 Q2 R1 R2 R4 R5 R6 R7 R3 R8 RA RB R9 R10 ZD1 Description Universal high brightness LED driver 1A 1KV diode tRR=1.8µs Ultra-fast-recovery diode 3A 600V tRR =50ns 1A, 600V bridge rectifier 15µF 450V electrolytic capacitor +/-20% 1000hrs @ 105C OMIT 4.7µF 50V electrolytic capacitor +/-20% 1000hrs @ 105C 10µF 450V electrolytic capacitor +/-20% 1000hrs @ 105C, 10mm diameter 100nF, 275VAC, Film, X2 10Ohm 1W fusible resistor +/200ppm Link with 22 to 26 SWG tinned copper wire 6.8mH inductor +/-10% 290mA radial 22mH or 30mH common mode inductor, 8mm height 3.3mH inductor +/-10% 420mA radial 275V, 21J, 9mm, Radial Wire link N-ch 600V MOSFET 3.2A, Qg(max)= 16nC NOT FITTED 10R 3W wirewound resistor, +/50ppm/C, +/-1% 3K 0.25W resistor +/-5% 0R 0.125W resistor +/-5% 1R2 0.25W +/-1% 2R7 0.25W +/-1% 100R 0.25W +/-1% NOT FITTED 330K 0.25W resistor +/-1% 10R 0.25W +/-5% 0R 0.25W +/-5% P/N AL9910A Package SO8 Manufacturer Diodes Inc S1M-13-F SF30JG-B SMA DO201AD Diodes Inc Diodes Inc DF06S EEUED2W150 400KXW27M10X30 UCY2G150MPD DF-S 5mm pitch Diodes Inc Panasonic Rubycon Nichicon ECE-A1HKG4R7 1206 1.5mm pitch Panasonic EEUEE2W100U 5mm pitch Panasonic ECQU2A104ML 15mm pitch Panasonic NFR0100001009JR5 00 Through-hole axial Vishay 19R685C 6mm pitch Murata B82791G2351N001 B82791G2301N001 19R335C 6mm pitch EPCOS EPCOS Murata B72207S0271K101 5mm pitch EPCOS SPB03N60S5 TO263 Infineon UB3C-10RF1 Any Any Any Any Any Any Any Any SOT23-6 Through-hole axial 1206 0805 1206 1206 1206 1206 1206 1206 1206 Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 5 Riedon Any Any Any Any Any Any Any Any AL9910EV5 PERFORMANCE Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 6 AL9910EV5 Issue 3 – June 2011 www.diodes.com © Diodes Incorporated 2011 7 AL9910EV5 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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