View LD1018_7535687.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ver2.0 1 LD1018 16 channel constant current driver LD1018 16 channel constant current led driver ver. 2.0 / mar. 2009 this document is a general product descriptio n and is subject to change without notice. ldt inc. does not assume any responsibility for use of circuits described. LD1018 16 channel constant current driver
ver2.0 2 LD1018 16 channel constant current driver LD1018 revision history 2009.03.25 1. change : supply voltage regulation : max ? 3% to max 6% 2. add : rext vs iout (3.3v) diagram. 3. add : dc characteristics (3.3v) 4. add : ac characteristics (3.3v) 5. change :propagation delays 2.0 2008.08.12 preliminary spec. 1.0 transfer date contents version
ver2.0 3 LD1018 16 channel constant current driver description the LD1018 is specifically designed for led display applications. the constant current output can be preset through an external resistor (i out = 3ma to 45ma). the device consists of 16bit shift register, latch and constant current output driver. the LD1018 provides a constant output current for driving the leds against for the variation of led forward voltage( vf ). the LD1018?s excellent current matching characteristics among the output ports and fast output response time will give you the best display quality for led display system. features ? 16 constant-current output channels ? output current : set -up at 3ma to 45ma with an external resistor ? pin to pin deviation : max ? 1.5% ? chip to chip deviation : max ? 3% ? 3.3v/5v cmos compatible input ? delayed output to prevent inrush current ? maximum data transfer rate : max 30mhz ? fast response of oeb - outn (min) : 60ns @v dd =5v, 100ns @v dd =3.3v ? 3.3v/5v supply voltage ? package : LD1018-sp (sop-24), LD1018-ss (ssop-24) ? ?pb_free & green? package pin connection gnd din clock strobe out0 out1 out2 out3 out4 out5 out6 out7 vdd r-ext dout oeb out15 out14 out13 out12 out11 out10 out9 out8 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 ordering information -40 ? c to 85 ? c 24 sop LD1018-sp -40 ? c to 85 ? c 24 ssop LD1018-ss ta package part number i-ref q q out0 out1 out15 q 16bit shift register r-ext oeb strobe din clock dout 16bit data latch 16 block diagram
ver2.0 4 LD1018 16 channel constant current driver terminal description equivalent circuit of inputs and outputs 1. oeb terminal vdd oeb gnd 2. strobe terminal vdd strobe gnd 3. clock, din terminal vdd gnd 4. dout terminal vdd (data) gnd clock, din dout supply voltage vdd 24 connect the resistor between this pin and gnd to set up the constant output current for all the outn. rext 23 serial data output terminal for shifting the data to next chip dout 22 output enable. active low oeb 21 constant current outputs for leds, n = 0 ~ 15 outn 5 -20 data is transferred to the output latch at strobe rising edge strobe 4 shift input clock for serial input data din( rising edge clocking) clock 3 serial input data din 2 ground terminal gnd 1 function pin name pin no
ver2.0 5 LD1018 16 channel constant current driver timing diagram 1 2 3 4 13 14 15 16 clock din on off on off on off on off on off strobe oeb out0 out1 out2 out14 out15 dout truth table input output dout out0 out7 out15 clock strobe oeb din no change d n d n-7 d n-15 h l dn no change no change l l dn no change off off off * h dn d n d n-7 d n-15 h l dn d n-15 no change l l dn d n-15 off off off * h dn d n-15 [note] 1) when the state of d n ~ d n-15 is ?h?, the outn is turned on( ?l? : outn is turned off ). 2) * : don?t care
ver2.0 6 LD1018 16 channel constant current driver maximum ratings ma 725 i gnd gnd terminal current w 1.67 p d sop power dissipation ( on pcb, ta = 25 ? ) 1.48 ssop ssop sop mhz 30 f clk clock frequency v -0.4 ~ v dd + 0.4 v in input voltage ma 60 i out output current v -0.5 ~ 7.0 v out output voltage v 0 ~ 7.0 v dd supply voltage 85 ? -40 ~ 85 t opr operation temperature ? /w 75 r th(j-a) thermal resistance ( on pcb, ta = 25 ? ) ? -55 ~ 150 t stg storage temperature unit rating symbol characteristic (ta = 25 ? unless otherwise noted)
ver2.0 7 LD1018 16 channel constant current driver dc characteristics (5.0v) % ? 0.2 vds within 1.0v and 3.0v %/dv ds output current vs. output voltage regulation ma 2 1 r ext = open i dd (off)1 ma 5.4 3 r ext = 1.0 ? i outn = 20ma i dd (off)2 ma 5.4 3 r ext = 1.0 ? i outn = 20ma i dd (on)1 ma 8 6 r ext = 0.5 ? i out = 40ma i dd (on)2 ? 400 200 100 r up pull up resistor r ext = 0.5 ? i out = 40ma ma 20 r ext = 1.0 ? i ol1 output current1 pint to pin % ? 1.5 r ext = 1.0 ? i out = 20ma 3 i ol1 % ? 1.5 r ext = 0.5 ? i out = 40ma 3 i ol2 v 1.0v dd - 0.8v dd v ih ?h? level input voltage 0.2v dd - gnd v il ?l? level v 0.2v dd - gnd v ol dout ?l? level output voltage v dd - 0.8v dd v oh 1.0 i ol vdd within 4.5v and 5.5v r ext = 0.5 ? - 5.5 v out output voltage % 6.0 %/dv dd output current vs. supply voltage regulation ? 400 200 100 r down pull down resistor v 5.5 5.0 3.0 v dd supply voltage ma 45 3 i out outn output current -1.0 i oh dout ma 40 i ol2 output current2 pin to pin ma 8 6 i dd (off)3 supply current unit max. typ. min. condition symbol characteristics (ta = 25 ? unless otherwise noted)
ver2.0 8 LD1018 16 channel constant current driver dc characteristics(3.3v) % ? 0.2 vds within 1.0v and 3.0v %/dv ds output current vs. output voltage regulation ma 2 1 r ext = open i dd (off)1 ma 5.4 3 r ext = 1.0 ? i outn = 20ma i dd (off)2 ma 5.4 3 r ext = 1.0 ? i outn = 20ma i dd (on)1 ma 8 6 r ext = 0.5 ? i out = 40ma i dd (on)2 ? 400 200 100 r up pull up resistor r ext = 0.5 ? i out = 40ma ma 20 r ext = 1.0 ? i ol1 output current1 pint to pin % ? 1.5 r ext = 1.0 ? i out = 20ma 3 i ol1 % ? 1.5 r ext = 0.5 ? i out = 40ma 3 i ol2 v 1.0v dd - 0.8v dd v ih ?h? level input voltage 0.2v dd - gnd v il ?l? level v 0.2v dd - gnd v ol dout ?l? level output voltage v dd - 0.8v dd v oh 1.0 i ol vdd within 4.5v and 5.5v r ext = 0.5 ? - 5.5 v out output voltage % 6.0 %/dv dd output current vs. supply voltage regulation ? 400 200 100 r down pull down resistor v 5.5 5.0 3.0 v dd supply voltage ma 45 3 i out outn output current -1.0 i oh dout ma 40 i ol2 output current2 pin to pin ma 8 6 i dd (off)3 supply current unit max. typ. min. condition symbol characteristics (ta = 25 ? unless otherwise noted)
ver2.0 9 LD1018 16 channel constant current driver ns - - - t phl2 strobe-outn ns 20 10 t w_clk clock ns 110 50 t plh1 clock-outn ns 40 t w_stb strobe ns - 60 t w_oeb oeb mhz 30 f clkmax maximum clock frequency ns - - 10 t sd data setup time ns - - 10 t hd data hold time ns - - 10 t ss strobe setup time ns - - 10 t hs strobe hold time ns 50 t r maximum clock rise time ns 50 t f maximum clock fall time ns 25 t or maximum output rise time ns 25 t of maximum output fall time pulse width ns 25 - 20 v dd = 5.0v v out = 1.0v v ih = v dd v il = gnd f clk = 10mhz r ext = 0.5 ? i outn = 40ma v l = 3.0v c l = 10.0pf r l = 50 ? t plh clock-dout propagation delay time (low to high) ns 110 50 t plh2 strobe-outn ns 120 - 30 t plh3 oeb-outn ns 25 - 20 t phl clock-dout ns 90 40 t phl3 oeb-outn ns 110 50 t phl1 clock-outn propagation delay time (high to low) unit max. typ. min. condition symbol characteristics ac characteristics (v dd =5.0v) (ta = 25 ? unless otherwise noted)
ver2.0 10 LD1018 16 channel constant current driver ns - - - t phl2 strobe-outn ns 20 10 t w_clk clock ns 160 60 t plh1 clock-outn ns 40 t w_stb strobe ns - 80 t w_oeb oeb mhz 30 f clkmax maximum clock frequency ns - - 10 t sd data setup time ns - - 10 t hd data hold time ns - - 40 t ss strobe setup time ns - - 10 t hs strobe hold time ns 50 t r maximum clock rise time ns 50 t f maximum clock fall time ns 25 t or maximum output rise time ns 25 t of maximum output fall time pulse width ns 25 - - v dd = 5.0v v out = 1.0v v ih = v dd v il = gnd f clk = 10mhz r ext = 0.5 ? i outn = 40ma v l = 3.0v c l = 10.0pf r l = 50 ? t plh clock-dout propagation delay time (low to high) ns 160 50 t plh2 strobe-outn ns 120 - 30 t plh3 oeb-outn ns 25 - - t phl clock-dout ns 180 50 t phl3 oeb-outn ns 160 60 t phl1 clock-outn propagation delay time (high to low) unit max. typ. min. condition symbol characteristics ac characteristics (v dd =3.3v) (ta = 25 ? unless otherwise noted)
ver2.0 11 LD1018 16 channel constant current driver dc characteristic test circuit ac characteristic test circuit signal generator v ih v il c l v l r l c l vdd LD1018 out0 out15 dout r-ext gnd oeb strobe din clock r l rext vdd i dd LD1018 out0 out15 dout i out r-ext gnd iref i ih i il v ih v il oeb strobe din clock rext i oh i ol
ver2.0 12 LD1018 16 channel constant current driver timing waveform clock-dout, outn clock-strobe oeb-outn clock din dout 10% 50% 90% 10% 50% 90% 50% 50% 50% t r t f t w_clk t hd t sd t plh , t phl clock din strobe outn 50% 50% 50% 50% 50% on off t w_stb t h s t ss t plh1 , t phl1 t plh2 , t phl2 oeb outn 10% 50% 90% 10% 50% 90% 50% 50% t plh3 t phl3 t w_oeb t or t of
ver2.0 13 LD1018 16 channel constant current driver adjusting output current the output current is determined by an exter nal resistor. the relationship between i out and r ext is as follows; i out [a] = {1.16/(90+r ext )} * 22 when vdd = 5v when vdd = 3.3v i out [a] = {1.16/(90+r ext )} * 21 vdd = 5.0v rext ( ? ) rext iout vdd = 3.3v rext iout rext ( ? )
ver2.0 14 LD1018 16 channel constant current driver constant output current the LD1018 provides a constant current output characteristics for led display application. the pin to pin deviation is max +/- 1.5% and chip to chip deviation is max +/- 3%. when vdd = 3.3v 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7065 $vssfou ? ? ? ? ? ? i out (ma) 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7065 $vssfo u ? ? ? ? ? ? i out (ma) when vdd = 5.0v
ver2.0 15 LD1018 16 channel constant current driver led supply voltage( vled ) it is very important to select the proper value of load resistor( rl ). because the optimal vout value guarantees the constant output current and long life time of led driver ic without over power consumption. for example, let?s calculate the load resistor value at vled=5v, iout=20ma, led forward voltage(vf)=3v. 1. the full current of LD1018 = 20ma x 16 (channels) = 320ma 2. the power consumption is 320ma x vout voltage. - when vout = 1v, the power consumption is 320mw. - when vout= 2v, the power consumption is 640mw. therefore, the load resistor (rl) = (vled ? vout? vf) / iout rl = (5v ? vout ? 3v) / 20ma = 50 ? (when vout = 1v) !? !? v led vf LD1018 v out !? !? v led vf LD1018 v out r l
ver2.0 16 LD1018 16 channel constant current driver package power dissipation( pd ) the LD1018 provides many package types such as 24-sop package and 24-ssop package. the maximum allowable package power dissipation is determined as pd(max) = (tj ? ta) / r_theta_ja. when 16 output channels are turned on simultaneously, the actual power dissipation of package is pd(act) = (idd x vdd) + (iout x duty x vout x 16). therefore, to keep that pd(act) is less than pd(max). the maximum allowable output current as a function of duty cycle is: ( r_theta_ja = 85c/w ) iout = {[(tj ? ta) / r_theta_ja] ? (idd x vdd)} / vout / duty / 16 where tj = 150c 1bdlbhf1pxfs%jttjqbujpo "ncjfou5fnqfsbuvsf $
1pxfs%jttjqbujpo 8
401 4401 *pvu wt %vuz 4401
%vuz *pvu n"
5b 5b 5b 5b *pvu wt %vuz 401
%vuz *pvu n"
5b 5b 5b 5b ( r_theta_ja = 75c/w )
ver2.0 17 LD1018 16 channel constant current driver application circuit - case1 LD1018 out0 out15 r-ext clock dout vdd oeb strobe din out0 out15 r-ext gnd gnd out7 clock dout oeb strobe din LD1018 din oeb strobe clock vdd vdd vdd vdd vled = 5v d00 d07 d015 i0 i7 i15 rl rl rl vled = 5v d10 d17 d115 i0 i7 i15 rl rl rl data & control signal connection for 16x2 static type application
ver2.0 18 LD1018 16 channel constant current driver clock strobe din oeb d115~d10 d015 ~ d00 ( 1st data ) d115~d10 d015 ~ d00 (2nd data) display on 1st data display 2nd 16 clocks 16 clocks 16 clocks 16 clocks clock strobe din oeb display off d115~d10 d015 ~ d00 ( 1st data ) d115~d10 d015 ~ d00 (2nd data) 1st data display 2nd 16 clocks 16 clocks 16 clocks 16 clocks timing diagram ? case1 timing diagram ? case1-1 timing diagram for 16x2 static type application timing diagram for 16x2 static type application
ver2.0 19 LD1018 16 channel constant current driver application circuit ? case2 controller r vled = 5v rl rl rl vdd vdd rl rl rl rl rl rl pnp pnp r 4 r 5 q15 pnp pnp r 4 r 5 q1 pnp pnp r 4 r 5 q0 d00 d01 d015 d10 d11 d115 d150 d151 d1515 data clk stb esb din clock strobe oeb vdd dout r-ext gnd out0 out1 out15 LD1018 s0 s1 s15 data & control signal connection for 16x16 dynamic type application
ver2.0 20 LD1018 16 channel constant current driver clock strobe s0 din d015 ~ d00 (1st display data) oeb d115 ~ d10 ( 2nd display data) s1 s15 d1515 ~ d150 (16th display data) row driver non overlap time (1st display data) (2nd display data) (16th display data) 16 clocks 16 clocks 16 clocks timing diagram case2 timing diagram for 16x16 dynamic type application
ver2.0 21 LD1018 16 channel constant current driver r vled = 5v rl rl vdd vdd rl rl pnp pnp r 4 r 5 q15 pnp pnp r 4 r 5 q0 s0 s15 d0000 d0015 d0150 d01515 rl rl d1000 d1015 vdd r rl rl d11515 d1150 data clk stb esb controller din clock strobe oeb vdd dout r-ext gnd out0 out15 LD1018 din clock strobe oeb vdd dout r-ext gnd out0 out15 LD1018 application circuit ? case3 data & control signal connection for 32x16 dynamic type application
ver2.0 22 LD1018 16 channel constant current driver clock strobe s0 din d1015 ~ d1000, d0015 ~ d0000 (1st display data) oeb s15 (1st display data) (16th display data) 32 clocks 32 clocks d11515 ~ d1150, d01515 ~ d0150 (16th display data) timing diagram - case3 timing diagram for 32x16 dynamic type application
ver2.0 23 LD1018 16 channel constant current driver LD1018-sp (sop 24) package information
ver2.0 24 LD1018 16 channel constant current driver LD1018-ss (ssop 24)

▲Up To Search▲

Price & Availability of LD1018

	To Download LD1018 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .