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ver1.0 1 LD1016 16 channel constant current led drivers LD1016 16-channel constant current led drivers ver. 1.0 / feb. 2003 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. LD1016 16 channel constant current led drivers
ver1.0 2 LD1016 16 channel constant current led drivers LD1016 revision history 'jstu7fstjpo 5sbotgfs%buf $poufout 7fstjpo
ver1.0 3 LD1016 16 channel constant current led drivers description features ? $potubou$vssfou0vuqvu$iboofmt ? $potuboupvuqvudvssfousbohfn"vqupn" ? 0vuqvudvssfoubekvtunfouuispvhibofyufsobmsftjtups ? &ydfmmfou0vuqvu$vssfou6ojgpsnjuz ? %fwjbujpopgcfuxffodiboofmt? .by
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? 7$.04$pnqbujcmf*oqvu ? 7bsjfuzpg1bdlbhf5zqf ? 1%*14401401 ? 1cgsff ? 1bdlbhf the LD1016(ld71d0016) is specifically designed for led display. LD1016 contains a serial buffer and data latches which convert serial input data to parallel output format. at LD1016 output stage, sixteen regulated current ports are designed to provide uniform and constant current for driving led within a large range of v ds variations. users may adjust the output current from 5ma to 90ma through an external resistor, r ext which gives users flexibility in controlling the light intens ity of led. the high clo ck frequency, 25mhz, also satisfies the high speed system requirements. gnd d in clk strobe i out 0 i out 1 i out 2 i out 3 i out 4 i out 5 i out 6 i out 7 v dd r ext d out oeb i out 15 i out 14 i out 13 i out 12 i out 11 i out 10 i out 9 i out 8 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 pin configuration ordering information -40 ? c to 85 ? c ld71d0016a-ss 24-ssop(300mil) LD1016-sk -40 ? c to 85 ? c ld71d0016a-s 24-sop(375mil) LD1016-sp ld71d0016a-p top marking -40 ? c to 85 ? c 24-dip(300mil) LD1016-pd ta package type part number
ver1.0 4 LD1016 16 channel constant current led drivers 16-bit output driver 16-bit output latch 16-bit shift register i-ref r ext oe strobe d in clk i out 14 i out 1 i out 0 i out 15 v dd gnd 16 16 functional block diagram d out terminal description supply voltage terminal v dd 24 input terminal used to connect an external resistor for setting up output current for all output channels r ext 23 22 21 5-20 4 3 2 1 pin no serial data output to the following d in of next driver ic d out output enable terminal when oe is low, the output drivers are enabled; when oe is high, all output drivers are turned off oeb constant current output terminals i out [0:15] serial data is transferred to the output latch when stobe is high. the data is latched when strobe goes low strobe clock input terminal for data shift to up-edge clk serial data input term inal for shift register d in gnd terminal for control logic and current sink gnd description pin name
ver1.0 5 LD1016 16 channel constant current led drivers v dd oe gnd strobe terminal v dd strobe gnd d out terminal clk, d in terminal v dd gnd clk, d in v dd data gnd oeb terminal d out equivalent circuit timing diagram 1 2 3 4 13 14 15 16 clk d in on off on off on off on off on off strobe oe i out 0 i out 1 i out 2 i out 14 i out 15 d out don?t care
ver1.0 6 LD1016 16 channel constant current led drivers truth table ? note: dn~dn-15 = ?h? then i out [0:15] is on, ?l? then i out [0:15] is off maximum ratings characterisric symbol rating unit supply voltage output voltage output current input voltage gnd terminal current clock frequency power dissipation operating temperature storage temperature v dd v out i out [0:15] v in i gnd f ck p d t opr t stg 0~7.0 -0.5~8.0 90 -0.4~v dd +0.4 1440 25 1.78 -40~85 -55~150 v v ma v ma mhz w o c o c ta = 25 o c %o %o ??? ? %o ??? ?? %o %o - 9 %o 0'' %o ) 9 %o %o ??? ? %o ??? ?? %o %o - ) %o ? /p$ibohf %o - - %o %o ??? ? %o ??? ?? %o %o - ) % 065 * 065 <> ? * 065 <> ?? * 065 <> % */ 0& 453 $-,
ver1.0 7 LD1016 16 channel constant current led drivers recommended operating condition characterisric symbol condition unit supply voltage v dd v max. 5.5 typ. 5.0 min. 4.5 - output voltage v out - 8.0 - - - output voltage i out ma 90 - - - i oh -1.0 - - - i ol 1.0 - - - i out [0:15] d out input voltage v in v v dd - 0 - data set up time t setup (d) ns - - 20 - data hold time t hold (d) ns - - 20 - strobe set up time t setup (s) ns - - 20 - strobe hold time t hold (s) ns - - 20 - clk pulse width t w clk ns - - 15 - t w clk - - 15 - clk pulse width f ck mhz 25.0 - - cascade operation power dissipation p d w 0.74 - - ta = 85 o c strobe pulse width t w stb ns - - 20 - t w stb - - 20 - ta = 25 o c
ver1.0 8 LD1016 16 channel constant current led drivers electrical characteristics test circuit for electrical characteristics v dd i dd LD1016 i out 0 i out 15 d out i ol r ext gnd iref i in i ih i il v in v ih v il oe strobe d in characterisric symbol test condition unit input voltage v ih v max. v dd typ. - min. 0.7v dd - test cir- cuit - ?h? level v il 0.3v dd - gnd - - ?l? level output voltage v ol v 0.2v dd - - - - d out v oh - - 0.8v dd - - i oz 1 - v oh = 6.0v - ua output leakage current output current1 i ol1 ma 43.0 40.0 37 r ext = 14kw - delta i out i ol1 + 6.0 + 1.5 - r ext = 14 kw i out = 40ma, v out = 1v - % output current2 i ol2 ma 80.0 75.0 70.0 r ext = 7.0 kw - delta i out i ol2 + 6.0 + 1.5 - r ext = 7.0 kw i out = 75ma, v out = 1v - % %/v dd 5.0 1.5 - r ext = 14 kw - %/v supply voltage regulation v ref - 1.12 - r ext =14 kw,ta =-40~85 o c - v reference voltage r in (up) 400 200 100 - - kw pull up resistor r in (down) 400 200 100 - - pull down resistor i dd (off) 1 0.6 0.3 - r ext = open, outn = off - v supply current i dd (off) 2 1.5 1.0 0.5 r ext = 14 kw, outn = off - ma i dd (off) 3 3.0 2.0 1.0 r ext = 7.0 kw, outn = off - r ext ta = 25c
ver1.0 9 LD1016 16 channel constant current led drivers characterisric symbol test condition unit propagation delay time (?l? to ?h?) t plh ns max. 70 typ. 30 min. - v dd = 5.0v v out = 1.0v v ih = v dd v il = gnd f ck = 10mhz r ext = 10 kw i out = 40ma v l = 3.0v c l = 10.0pf r l = 65w test cir- cuit - clk-d out 1500 600 ck-outn 1500 600 strobe- outn 1500 600 oe-outn - - - propagation delay time (?h? to ?l?) t phl ns 70 30 - - ck-d out 1000 350 ck-outn 1000 350 strobe- outn 1000 350 oe-outn - - - max. clock frequency f ckmax (*1) mhz 25 10 - - 50 20 - clk 40 10 strobe - propagation delay time (?h? to ?l?) ns t wck - t w stb - data set up time t setup (d) ns 30 10 - - data hold time t hold (d) 30 10 - - 20 10 - lh 20 0 hl - strobe setup time ns t stb setup - 20 10 - lh 20 0 hl - strobe hold time ns t stb hold - max. clock rise time t r 10 - - - ns max. clock fall time t f 10 - - min. output rise time t or 1000 300 - - ns min. output rise time t of 600 150 - ac characteristics ? note: . *1 : cascade operation ta = 25c sw-matrix v ih v il c l v l r l c l v dd LD1016 i out 0 i out 15 d out r ext gnd oe strobe d in test circuit for ac characteristics
ver1.0 10 LD1016 16 channel constant current led drivers h l h l h l clk d in on off 50% 50% t setup strobe i out [0:15] t phl t plh 50% 50% 50% 50% h l on off oe i out [0:15] clk to d out , i out [0:15] h l h on l off clk d in d out i out [0:15] t phl t w t setup t hold t or t of t plh 90% 50% 10% 90% 50% 10% 90% 50% 10% 90% 50% 10% 50% 50% 50% h l timing waveform clk to strobe oe to i out [0:15]
ver1.0 11 LD1016 16 channel constant current led drivers application guide 6k7k 9k 10k 15k 20k 30k 60k 100 90 80 70 60 50 40 30 20 10 0 r ext -i out i out (ma) resistance of the external resister r ext in w v ds = 1.0v r ext i out 9 k ? 60ma 11 k ? 50ma 14 k ? 40ma 19 k ? 30ma 29 k ? 20ma 59 k ? 10ma 7 k ? 75ma 6 k ? 85ma adjusting 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. also, the output current can be calculated from the equation: v r-ext = 1.2v ; internal resistance r int = 1k ? i out = [v r-ext / (r ext + r int )] x 480 where r ext 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 cu rrent (as a function of r ext ) is around 40ma at 14k ? and 20ma at 29k ? constant current in led display application, LD1016 provides nearly no variation in current from channel to channel and ic to ic. this can be achieved by: 1) the maximum current variation between channels is less than ? 3%, and that between ics is less than ? 6%. 2) in addition, the current characteristic of output stage is flat. the output current can be kept constant regardless of the variations of led forward voltage. this perform as a perfection of load regulation.
ver1.0 12 LD1016 16 channel constant current led drivers application example LD1016 i out 0 i out 15 r ext gnd i out 7 clk d out cpu v dd = 5v vled = 5v 0 7 15 0 7 15 i0 i7 i15 i 0 i7 i15 i 0 = i7 = i15 oe strobe d in i out 0 i out 15 r ext gnd i out 7 clk d out oe strobe d in LD1016
ver1.0 13 LD1016 16 channel constant current led drivers package information (0.002 min) 24 ssop ? 300 mil #1 #12 #13 #24 7.90 + 0.30 (0.311 + 0.012) 15.20 + 0.20 (0.598 + 0.008) 15/60 max (0.614 max) 2.00 max 0.079 max 1.75 + 0.10 (0.069 + 0.004) 0.05 min 0.45 (0.018 + 0.004,- 0.002) +-.10 +0.50 1.27 (0.050) 5.30 + 0.20 (0.209 + 0.008) 7.62 (0.300) 0.60 + 0.20 (0.024 + 0.008) 0 ~ 8 o ( 0 . 0 0 8 , + 0 . 0 0 4 , - 0 . 0 0 2 ) 0 . 2 0 + 0 . 1 0 - 0 . 0 5 unit : mm (inch)
ver1.0 14 LD1016 16 channel constant current led drivers #1 #12 #13 #24 10.30 + 0.30 (0.406 + 0.012) 15.34 + 0.20 (0.604 + 0.008) 15/74max (0.620max) min0.05 (mino.002) 0.38 (0.015, + 0.004,- 0.002) +0.10 -0.05 1.27 (0.050) 2.60max (0.102max) 0.69 (0.027) 2.35 + 0.10 (0.093 + 0.004) 7.50 + 0.20 (0.295 + 0.008) 9.53 (0.375) 0.87 + 0.20 (0.034 + 0.008) 0 ~ 8 o (0.008, + 0.004, - 0.002) 0 . 2 0 + 0.10 - 0 . 0 5 unit : mm (inch) 24 sop ? 375mil
ver1.0 15 LD1016 16 channel constant current led drivers unit : inch 0.258 + 0.025 1.250 + 0.03 0.300 q = 7 ~ 1 5 o 0.355+ 0.02 0.018typ 0.100typ 0.050typ 0.130 + 0.02 0.210 seting plane 0.130 + 0.05 24 pdip ? 300mil

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