550 e. weddell drive, suite 4, sunnyvale, ca 94089. u. s. a. tel.: (408) 747 - 9760, fax: (408) 747 - 9770. www.analogtechnologies.com ? copyright 1999 ? 2004, analog technologies, inc. all rights reserved. upda ted: 10/28/04 1 / 4 led22v1a 2dw analog technologies, inc. high efficiency led controller main features: high efficiency, output current adjustable , high stability , small size, output short circuit protection , and low cost. specifications part number: led22v1a 2dw input voltage: 7 v to 22v output voltage: 2v to power supply voltage ? 1v maximum output current: 1a efficiency: 90% typical dimming control voltage: 1.25 to 2.5 v packaging: fr - 4 pcb + epoxy operating temperature: - 10 c to 85 c dimension: 16 mm 16.7 mm 6 mm output pin description pin 1, sync digital input. it can be used to s ynchronize the led controller switching frequency by an external clock signal . pin 2, sdng digital input. it can be used to shut down the led controller , has a negative logic: 0 = shut down and 1 = turn on , and is inter nally pulled up. leaving this pin unconnected enables the led controller. pin 3, vsw digital output. it can be used to syn chronize other led controllers as the clock signal source. when used as the clock master unit, a higher switching frequency unit mus t be ordered and the part number becomes: LED22V1A2DWm . pin 4 , 2.5v analog output. the reference voltage of 2.5v used by the controller. it has a 20ppm/ c drift and can provide 1ma current . pin 5 , lis analog input/output. it can be used to set th e output led current or indicate the voltage for setting the output led current. the relationship between this voltage and the output current is: led current = ( lis (v) ? 1.25v)/1.25 (a) . for example, when this voltage equals to 2v, the output led current is (2 ? 1.25)/1.25 = 0.6a . the internal circuit is shown in figure 1. pin 6 , gnd power input. connect it to the power supply return terminal . pin 7 , vps power input. connect it to the power supply positive terminal . pin 8, leda a nalog output . con nect it to the led ?s positive terminal, the anode. pin 9 , ledc analog output. connect it to the led?s negative terminal, the cathode . applications the LED22V1A2DW is a compact high efficiency led controller. no heat sink is needed for operation. the out put current can be set either by an internal pot (potentiometer) on the top side of the controller, by an external pot, or an external dac (digital to analog converter). the voltage required for setting the output led current from 0 to 1a is 1.25v to 2.5v. i.e., when setting lis (pin 5) to 1.25v or below, the correspondent output led current is 0; when setting to 2.5v (the reference voltage provided by the controller), the output current is 1a.
550 e. weddell drive, suite 4, sunnyvale, ca 94089. u. s. a. tel.: (408) 747 - 9760, fax: (408) 747 - 9770. www.analogtechnologies.com ? copyright 1999 ? 2004, analog technologies, inc. all rights reserved. upda ted: 10/28/04 2 / 4 led22v1a 2dw analog technologies, inc. when using m ultiple LED22V1A2DW units with in one system, it wo uld be better to have all their switching frequencies synchronized, thus minimizing the ripple voltage across the power supply and interference s to other electronics. two ways to synchronize their switching frequencies: 1. use an external clock signal of between 750khz to 1mhz and connect it to the sync pin s (#1) of all the controllers . 2. use one of the led controllers as a master unit (ordering part number: LED22V1A2DWm) and the rest as slave units. connect the vsw pin (#3) of the master unit to the syn c pins (#1) of all the slave units. figure 1 shows the connection for typical applications. please note that all the optional connections are not necessary for the controller to operate. the circuitries shown inside the controller boarder are the internal circuits embedded in the controller. figure 2 shows the top view of the controllers and its connection wires, the pot, and the soldering pads for the optional connections. 1 3 2 w1 5k gnd 6 vps 7 vsw 3 2.5v 4 lis 5 sdng 2 sync 1 ledc 8 leda 9 LED22V1A2DW switching signal output power supply 0v s1 switch external clock signal external dimming control on/off led 1w to 5w power supply 7v to 22v figure 1 typical application of led controller LED22V1A2DW 0 to 1a 1 2 rs 50mohm 1 3 2 w2 10k 1 2 r2 10k control input cw (clock-wise) cw (optional) (optional) (optional) 1 2 r3 10k 1 2 r1 4.99k (optional) soldering pads figure 2 top view pot 9 16 0.1 mm 16.7 0.1 mm lis sdng 8 7 6 5 4 3 2 1 2 vps 2.5v vsw sync ldc lda gnd connection wire s
550 e. weddell drive, suite 4, sunnyvale, ca 94089. u. s. a. tel.: (408) 747 - 9760, fax: (408) 747 - 9770. www.analogtechnologies.com ? copyright 1999 ? 2004, analog technologies, inc. all rights reserved. upda ted: 10/28/04 3 / 4 led22v1a 2dw analog technologies, inc. figure 3 LED22V1A2DW picture
550 e. weddell drive, suite 4, sunnyvale, ca 94089. u. s. a. tel.: (408) 747 - 9760, fax: (408) 747 - 9770. www.analogtechnologies.com ? copyright 1999 ? 2004, analog technologies, inc. all rights reserved. upda ted: 10/28/04 4 / 4 led22v1a 2dw analog technologies, inc. part numbers for ordering part number note LED22V1A2DW it can be used as the slave unit for multiple unit operation . LED22V1A2DWm it can be used as the master unit for multiple unit operation . prices and lead - times for ordering part number 1 ? 9 pcs 10 ? 49 pcs 50 ? 2 49 pcs 250 ? 999 pcs 1000 pcs and up LED22V1A2DW $28 $24 $18 $14 $12 led22v1a 2dw m $28 $24 $18 $14 $12 lead time 1 week 2 weeks 2 weeks 3 weeks contact us note: ati retains the ownership of full rights for its led controller technologies, associated t he designs for mechanics and electronics, plus all modifications, improvements, and inventions made by ati.
|
