PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 1 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 features ? 16 -c hannel constant ?current output. ? output constant current: 2 - 80ma ? current accuracy (all output on) ? between bits 1% ? between ic?s 1% ? output current 2~80ma adjustable ? output current adjustable through an external resistor . ? interleave time delay of output channel ? fast response for output port (tr/td=50ns) ? 25mhz clock frequency description PA5026 contains a serial buffer and data latches which convert serial input data into parallel output format. at PA5026 output stage, sixteen regulated current ports are designed to provide uniform and constant current sinks for driving led?s within a large range of vf variations. PA5026 provides users with great flexibility and device performance in their system design for led display applications, e.g. led panels. users may adjust the output current from 2 ma to 80 ma through an external resistor, rext, which gives them the flexibility in controlling the light intensity of led?s. PA5026 guarantees a maximum of 17v at the output port. the high clock frequency, 25 mhz, satisfies the system requirements of high volume data transmission. ordering information device no. package PA5026p ssop - 24 - 300 - 1.0 PA5026s ssop-24-150-0 .635 PA5026r PA5026qn qfn-24 block diagram 5 6 20 22 23 21 4 2 3 rext oe le sdi clock serial -out 1- reg q st d q st d q st d d q ck d q ck d q ck out 0 out 1 out 15 95 1 80
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 2 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 pin configurations PA5026p (ssop-24-300-1.0) PA5026s (ssop-24-150-0.635) PA5026qn (qfn-24) and PA5026r (ssop-24-150-0.635) pin descriptions pin number pin name description PA5026qn PA5026p PA5026r PA5026s 22 1 7 gnd ground 23 2 8 sdi shift register data input pin 24 3 9 clk shift register clock input pin, 1 4 10 latch enable data strobe input pin, 2~9 5~12 11~18 out0~out7 10~15 13~18 19~24 out8~out13 16~17 19~20 1~2 out14~out15 output port 18 21 3 oe output enable 19 22 4 sdo shift register data output pin 20 23 5 r-ext external resistor input port 21 24 6 v dd power supply 2 3 4 5 1 7 8 9 10 11 12 6 23 22 21 20 24 18 17 16 15 14 13 19 gnd sdi clk le out 0 out 1 out 2 out 3 out 4 out 5 out 6 out 7 out 8 out 9 out 10 out 11 out 12 out 13 out 14 out 15 oe sdo r-ext v dd 2 3 4 5 1 7 8 9 10 11 12 6 23 22 21 20 24 18 17 16 15 14 13 19 out 14 out 15 oe sdo r-ext v dd gnd sdi clk latch out 0 out 1 out 2 out 3 out 4 out 5 out 6 out 7 out 8 out 9 out 10 out 11 out 12 out 13 1 2 3 4 5 6 18 17 16 15 14 13 7 8 9 10 11 12 24 23 22 21 20 19 le out0 out1 out5 out6 out7 out8 out9 out10 out11 out12 out13 out14 out15 oe sdo gnd cl k sdi rext vdd pad out2 out3 out4
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 3 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 timing diagram truth table clk le oe sdi out0?out7?out15 sdo h l d n d n?? d n-7?? d n-15 d n-15 l l d n+1 no change d n-14 h l d n+2 d n?? d n-5?? d n-13 d n-13 x l d n+3 d n?? d n-5?? d n-13 d n-13 x h d n+3 off d n-13 n= 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 clk sdi le oe out0 out1 out2 out3 out15 sdo off on off on off on off on off on off on don?t care
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 4 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 maximum ratings characteristic symbol rating unit supply voltage v dd 0~7.0 v input voltage v in -0.4~v dd + 0.4 v output current i out +90 ma output voltage v ds -0.5~+17.0 v clock frequency f clk 25 mhz gnd terminal current i gnd 1440 ma cn ? type 2.32 cns ? type 1.87 cd ? type 2.51 cf ? type 2.12 cp ? type 1.73 power dissipation (on pcb, ta=25c) cpa ? type p d 1.73 w cn ? type 53.82 cns ? type 66.74 cd? type 49.81 cf ? type 59.01 cp ? type 72.43 thermal resistance (on pcb, ta=25c) cpa ? type r th(j-a) 72.43 c/w operating temperature t opr -40~+85 c storage temperature t stg -55~+150 c
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 5 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 electrical characteristics characteristic symbol condition min. typ. max. unit supply voltage v dd - 2.5* 5.0 5.5 v output voltage v ds out0 ~ out15 - - 17.0 v i out dc test circuit 2 - 80 ma i oh sdo - - -1.0 ma output current i ol sdo - - 1.0 ma ?h? level v ih ta = -40~85oc 0.8vdd - vdd v input voltage ?l? level v il ta = -40~85oc gnd - 0.3vdd v output leakage current i oh v oh =17.0v - - 0.5 a v ol i ol =+1.0ma - - 0.4 v output voltage sdo v oh i oh =-1.0ma 4.6 - - v output current 1 i out1 v ds =0.6v rext=720 ? - 26.25 - ma current skew di out1 i ol =26.25ma v ds =0.6v rext=720 ? - 1 3 % output current 2 i out2 v ds =0.8v rext=360 ? - 52.5 - ma current skew di out2 i ol =52.5ma v ds =0.8v rext=360 ? - 1 3 % output current vs. output voltage regulation %/dv ds v ds within 1.0v and 3.0v - 0.1 - % / v output current vs. supply voltage regulation %/dv dd v dd within 4.5v and 5.5v - 1 - % / v pull-up resistor r in(up) oe 250 500 800 k ? pull-down resistor r in(down) le 250 500 800 k ? i dd(off) 1 r ext =open, out0 ~ out15 =off - 7 12 i dd(off) 2 r ext =720 ? , out0 ~ out15 =off - 10 12 ?off? i dd(off) 3 r ext =360 ? , out0 ~ out15 =off - 12 15 i dd(on) 1 r ext =720 ? , out0 ~ out15 =on - 10 18 supply current ?on? i dd(on) 2 r ext =360 ? , out0 ~ out15 =on - 12 20 ma * 2.5v min for red led only green and blue led require up to 4.0v
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 6 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 test circuit test conditions: for above figure t amb =25 ? c,v dd =v ih =3.3v and 5v,v out = o.7 v,v il =ov ,rext =49o ? ,v l =3 .ov ,r l =6o ? ,c l =io.5pf switching characteristics characteristic symbol condition min. typ. max. unit clk - outn t plh1 - 100 150 ns le - outn t plh2 - 100 150 ns oe - outn t plh3 - 50 150 ns propagation delay time (?l? to ?h?) clk - sdo t pl h 15 20 - ns clk - outn t phl1 - 50 100 ns le - outn t phl2 - 50 100 ns oe - outn t phl3 - 20 100 ns propagation delay time (?h? to ?l?) clk - sdo t phl 15 20 - ns clk t w(clk) 20 - - ns le t w(l) 20 - - ns pulse width oe t w(oe) 200 - - ns hold time for le t h(l) 5 - - ns setup time for le t su(l) 5 - - ns hold time for sdi t h(d) 10 - - ns setup time for sdi t su( d) v dd =5.0 v v ds =0.8 v v ih =v dd v il =gnd r ext =300
v l =4.0 v r l =52
c l =10 pf 5 - - ns clock frequency f clk cascade operation - - 25.0 mhz maximum clk rise time t r ** - - 500 ns maximum clk fall time t f ** - - 500 ns output rise time of vout (turn off) t or - 70 200 ns PA5026 v il +v ih oe clk sw- matrix 21 3 4 2 23 24 22 20 5 le sdi r-ext gnd 1 sdo out15 out0 v dd r l r l c l c l v l c l
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 7 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 output fall time of vout (turn on) t of - 40 120 ns timing waveform clk sdi sdo le oe outn 50% 50% 50% t w(clk) t su(d) t h(d) 50% 50% t plh t phl t w(l) 50% 50% 50% t h(l) t su(l) low = outputs enabled 50% t plh1, t phl1 t plh2, t phl2 low = outputs on high = outputs off outn oe 50% t w(oe) 50% 50% 90% 90% 10% 10% 50%
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 8 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 application note in led applications, the PA5026 can maintain the current with almost no variation, across different channels and chips. the maximum current accuracy between bits is 3%, and between chips is 6%. there is only one ground pin for signal ground, constant current source ground and power ground. we recommend adopting minimum inductance in layout to reduce the switch noise and chip faults. in order to prevent driver damage by over current, do not turn off the driver and scan the triode at the same time. t he resistor should be placed near the r -e xt pin . the output current of each channel (i out ) is set by an external resistor, rext. the output current can be calculated from the equation: vr -ext = 1.26v i out = (v r-ext / r ext ) x 15 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 current (as a function of r ext ) is around 52.5ma at 360 ? and 26.25ma at 720 ? . electrical characteristic curve 100 90 80 70 60 50 40 30 20 10 0 0.1k 1k 10k output current ? r ext resistance i out - r -ext i out (ma) r ext ( ? )
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 9 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 package outline and dimensions (measurements shown in mm) ssop-24-150-0.635 for PA5026s and the PA5026r package outline and dimensions ssop-24-300- 1.00 for PA5026p 0.18 o .1 o 6 . oo o . 2 o 1.45 o . 2 o 1.57 o . 2 o 3 . 9 o o . 2 o o . 65 o .1 5 8.650.20 0.30 0.635 0.25 pin 1 pin 24 0.18 o .1 o 8. oo o . 2 o 1.45 o . 2 o 1.87 o . 2 o 6.o o . 2 o o . 65 o .1 5 13.0 0.20 0.40 1.0 0.25 pin 1 pin 24
PA5026 16- bit consta nt current led sink driver analog products division 561 e elliot road.#175 chandler, az 85225 tel: (480)539-2900. fax: (480)632-1715. 10 www.protekanalog.com not for use in any life support systems. 95180. rev.2. 09/09 package outline and dimensions qfn-24 for PA5026qn recommended pad layout tape and reel specifications reel dia a0 b0 k0 d e f w p0 p2 p t- max 178 (7?) 4.100.10 4.100.10 0.850.10 1.500.10 1.750.10 3.500.05 12.000.30 4.000.10 2.000.05 4.000.10 0.25 p0 p2 d a0 b0 p e f w pin 1 indicated b y dot k0 top cover tape t 10 pitches cumulative tolerance on tape 0.2
|
