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technical data 1 2011, february ver. 03 thin shrink sop tssop20 constant C current l ed driver features ? 16 constant - current output channels ? constant output current invariant to load voltage change ? excellent output current accuracy: between channels: < 3 % (max.), and between ics: <6% (max.) ? output cur rent adjusted th rough an external resistor ? constant output current range per channel: 5 - 60 ma ? schmitt trigger input ? 5v supply voltage ? package type: pb - free package with thermal pad ordering information device operating temper a ture range package shippi ng ik28 16tsdt = - 40 ... + 85 ? tssop - 20 tape& reel current accuracy conditions between channels between ics <3% <6% i out = 5~ 60 ma product description IK2816 is an instant on/off led driver for lighting applications and exploits to enhan ce its output characteristics. at IK2816 output stage, sixteen regulated current ports are designed to provide uniform and constant current sinks for driving leds within a large range of vf variations. IK2816 provides users 16 - channel constant current port s to match leds with equal current. users may adjust the output current from 5 ma to 60 ma through an external resistor, rext, which gives users flexibility in controlling the light intensity of leds. in addition, users can precisely adjust led brightness from 0% to 100% via output enable with pulse width modulation. additionally, to ensure the system reliability, IK2816 is built with thermal protection (tp) function and thermal pad. the tp function protects ic from over temperature ( 1 65c). also, the th ermal pad enhances the power dissipation. as a result, a large amount of current can be handled safely in one package. applications ? automotive interior lighting ? channel letter ? decoration lighting IK2816
IK2816 2 2011, february ver. 03 typical application circuit figure 1 function al diagram
IK2816 3 2011, february ver. 03 pin configuration pin description pin name function gnd ground terminal for control logic and current sink out0~out15 constant current output terminals oe output enable terminal when oe is active (low), the output pi ns are enabled; when oe is inactive (high), all output pins are turned off (blanked). r - ext terminal used to connected an external resistor (r ext ) for setting up output current for all output channels vdd 5v supply voltage terminal thermal pad power dis sipation terminals connected to gnd* *to eliminate the noise influence, the thermal pad is suggested to be connected to gnd on pcb. in addition, desired thermal conductivity will be improved, if a heat - conducting copper foil on pcb is soldered with therma l pad.
IK2816 4 2011, february ver. 03 absolute m aximum ratings characteristic symbol rating unit supply voltage v dd 0~7.0 v input voltage v in - 0.4~vdd + 0.4 v output current i out 80* ma sustaining voltage v ds 27 .0 v gnd terminal current i gnd 1000 ma power dissipation* (on pcb, ta=25 oc) tssop20 p d 0.85 w thermal resistance** (by simulation) r th(j - a) 31.99 oc/w empirical thermal resistance* (on pcb, ta=25 oc) 117 operating junction temperature t j,max 125 o c operating temperature t opr - 40~+85 oc storage temperature t stg - 55~+150 oc *users must notice that the power dissipation (almost equaling to i out x v ds ) should be within the safe operation area shown in figure 7. **provided by factory. *** stresses b eyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditi ons is not implied. exposure to absolute - maximum - rated conditions for extended periods may affect device reliability.
IK2816 5 2011, february ver. 03 electrical characteristics characteristics symbol condition min. typ. max. unit supply voltage v dd 4 .5 5.0 5.5 v sustaining voltage at out pin v ds out0~out15 27 .0 v output current i out dc test circuit 5 60* ma input voltage h level v ih ta= - 40~85 oc 0.7*v dd v dd v l level v il ta= - 40~85 oc gnd 0.3*v dd v output leakage current i oh v oh = 27v 0.5 a output current 1 i out1 v ds =0.6v r ext =2.4kohm 30.5 ma current skew 1 di out/iout i ol =30.5ma v ds =0.6v r ext =2.4kohm 1 3 % output current 2 i out2 v ds =0.8v r ext =1.3kohm 56.0 ma current skew 2 di out/iout i ol =56ma v ds =0.8v r ext =1.3k ohm 1 3 % regulation of output current vs. sustaining voltage %/dv ds v ds within 1.0v and 3.0v 0.1 %/v regulation of output current vs. supply voltage %/dv dd v dd within 4.5v and 5.5v 1 %/v pull - up resistor r n(up) __ oe 250 500 800 k ? therm al shutdown temperature t xi shutdown temp.increasing 165 oc t xd reset temp.decreasing 145 oc supply current off i dd (off) 1 r ext =open, out0~out15=off 5 9 ma i dd (off) 2 r ext =2.4kohm,out0~out15=off 6 10 i dd (off) 3 r ex t =1.3kohm,out0~out15=off 8 12 on i dd (on) 1 r ext =2.4kohm,out0~out15=on 6 10 i dd (on) 2 r ext =1.3kohm,out0~out15=on 7 10 each output current, i out , can be driven up to 8 0ma, but the total output current should be smaller than 1a. test circ uit for electrical characteristics figure 2
IK2816 6 2011, february ver. 03 switching characteristics characteristics symbol condition m in. t yp. max. unit propagation delay time( plh v dd =5.0v v ds =1.0v v ih = v dd v il =gnd r ext = 1229 (i outn =60ma) v l =4.0v r l =51 c l =10pf 0.05 0.1 0.2 us propagation delay time( phl 0.05 0.1 0.2 us pulse width ___ oe t w(oe) 1.0 - - us output rise time of out (turn off) t or 0.05 0.1 0.2 us out put rise time of out (turn on) t of 0.1 0.2 0.4 us test circuit for switching characteristics figure 3
IK2816 7 2011, february ver. 03 application circuits (a) IK2816 application circuit, where v led and v dd share a single voltage source. * v led > v ds + v f,led x n; v f, led : forward voltage of led; n: led count ** r1 = (v led - 5.1v) / i dd ; refer to electrical characteristics for i dd *** r2~r17 = [v led C v ds C (v f,led x n)] / i led (b) IK2816 application circuit with dimming control by pwm signal, where v led and v dd use vo ltage sources separately. *v led = v ds + v f,led x n; v f,led : forward voltage of led; n: led count figure 4
IK2816 8 2011, february ver. 03 constant current in led lighting applications, IK2816 provides nearly no variation in current from channel to channel and from ic to ic. this can be achieved by: 1) the maximum current variation between channels is less than 5 %, and that between ics is less than 6%. 2) in addition, the current characteristic of output stage is flat and users can refer to the figure as shown below. the output current can be kept constant regardless of the variations of led forward voltages (v f ). this guarantees led to be performed on the same brightness as users specification. figure 5 iout vs vds 0 10 20 30 40 50 60 70 0 0,5 1 1,5 2 2,5 3 vds (v) iout (ma) 32k 9,65k 5.68k 4,0k 2,63k 1,93k 1,5k 1,25k
IK2816 9 2011, february ver. 03 setting output current the output current of each channel (i out ) is set by an external resistor, r ext . the relationship between i out and r ext is shown in the following figure 6 and table . figure 6 iout ( m a) rext ( k ? ) 60 1.25 5 0 1.5 4 0 1.93 3 0 2.63 2 0 4.0 1 0 9.65 5 32.0 the output current can be calculated from the equation: v r - ext = 1.24v; rext = (v r - ext / iout) 59 = (1.24v / iout) 59 , iout = (v r - exr / rext) 59 = (1.24v / rext) 59 within 6% chip skew where rext is the resistance of the external resistor connected to r - ext terminal and v r - ext is the voltage of r - ext terminal. the magnitude of current (as a function of rext) is around 56 ma at 1. 3 k? and 30.5 ma at 2.4k?. iout vs rext 0 10 20 30 40 50 60 70 0 5 10 15 20 25 30 35 rext (k?) iout (ma)
IK2816 10 2011, february ver. 03 package power dissipatio n (pd) the maximum power dissipation, p d (max) = (t j,max C t a ) / r th(j - a) , decreases as the ambient temperature increases. figure 7 the maximum allowable package power dissipation is determined as p d (max) = (t j,max C t a ) / r th(j - a) . when 16 output cha nnels are turned on simultaneously, the actual package power dissipation is p d (act) = (i dd x v dd ) + (i out x duty x v ds x 16). therefore, to keep p d (act) p d (max), the allowable maximum output current as a function of duty cycle is: i out = { [(t j C t a ) / r th(j - a) ] C (i dd x v dd ) } / v ds / duty / 16, where t j = 125c; duty= t on / t; t on : the time of leds turning on; t: signal period *note: the em pirical thermal resistor r th(j - a) =117 c/w; it is based on the following structure.
IK2816 11 2011, february ver. 03 tp function (thermal protection) therma l protection turns off the output current when the junction temper ature rises to approximately 165 c, allowing the device to co ol. when the junction tem per ature cools to approximately 145c, the output c urrent is turned on again. depending on power dissi pation, thermal resistance, and ambient tempe rature, the thermal protection circuit may cycle on and off. this limits the dissipation of the driver , protecting it from damage due to overheating. load supply voltage (vled) IK2816 is designed to operate with adequate v ds to achieve constant current. v ds together with i out should not exceed the package power dissipation limit, p d(max) . as in figure 8, v ds = v led C v f , and v led is the load supply voltage. p d(act) will be greater than p d(max) , if v ds drops too much voltage on the driver. in this case, it is recommended to use the lowest possible supply voltage or to set a n external voltage reducer, v drop . a voltage reducer lets v ds = (v led C v f ) C v drop . resistors can be used in the applications as shown in figure 8. figure 8
IK2816 12 2011, february ver. 03 package dimensions tssop 20 note: the unit for the outline drawing is mm.

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