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ic-nzn n-type laser diode driver rev b1, page 1/ 17 features ? peak value controlled laser diode driver for operation from cw up to 155 mhz ? spike-free switching of laser currents of up to 300 ma ? setting of laser power (apc) via external resistor ? optional current control (acc) ? laser current limitation ? lvds/ttl switching input with ttl monitor output ? low current consumption sleep-mode < 50 a ? safety shutdown with overtemperature ? error signal output with overtemperature, undervoltage and overcurrent ? all current ld types can be used (n/p/m con?gurations) ? blue laser diodes supported ? fast soft-start ? strong suppression of transients with small external capacitors applications ? pulsed and cw laser diode modules ? laser diode pointers ? laser levels ? bar-code readers ? distance measurement ? blue laser diodes packages qfn24 4 mm x 4 mm block diagram copyright ? 2011 ic-haus http://www.ichaus.com p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 2/ 17 description laser diode pulse driver ic-nzn allows cw opera- tion of laser diodes and spike-free switching with de- ?ned current pulses up to 155 mhz. the optical out- put power of the laser diode is set-up by means of an external resistor (rmd/pmd). for laser current con- trol without a monitor diode, the laser current moni- tor at pin imon is utilised. for high pulse frequen- cies the device can be switched into controlled burst mode . a previously settled operating point is main- tained throughout the burst phase. an averaging current monitor can be set by means of an external resistor at pin rsi. when the current limit is reached, overcurrent is signalled at nerr and the current from pin lda is limited to the pre-set value but the ic is not shut down. there is an additional current limitation in pin ldk that prevents the ic from overpowering the laser diode. setting pin nslp low, the ic enters a low consump- tion sleep-mode (< 50 a typ.). packages qfn24 4 mm x 4 mm to jedec pin configuration pin functions no. name function 1 vdd power supply 2 avg enable averaging control 3 md apc setup, monitor input 4 imon laser current monitor 5 cid enable pulldown current at ci 6 ep positive lvds/ttl switching input 7 en negative lvds switching input 8 ttl enable ttl input 9 vsy sync output supply voltage 10 syn sync output 11 rgnd reference ground 12 rvdd reference (p-type laser diodes) 13 ldk laser diode cathode 14 agnd analog ground 15 cis power control capacitor sense 16 ci power control capacitor 17 lda laser diode anode 18 n/c 19 rsi current monitor setup 20 rege control enable 21 gnd ground 22 nslp not sleep-mode 23 nerr error output 24 n/c the thermal pad is to be connected to a ground plane (gnd) on the pcb. only pin 1 marking on top or bottom de?nes the package orientation ( nzn label and coding is subject to change). p r e l i m i n a r y p r e l i m i n a r y 7 8 9 1 0 1 1 1 2 3 4 5 1 3 1 4 1 5 2 1 2 2 6 1 2 1 6 1 7 1 9 2 0 1 8 2 3 2 4 n z n c ode . . . .. .
ic-nzn n-type laser diode driver rev b1, page 3/ 17 package dimensions all dimensions given in mm. p r e l i m i n a r y p r e l i m i n a r y 4 4 0.90 side 0.25 0.50 2.45 2.45 0.40 bottom 2.49 3.80 2.49 3.80 r0.15 0.50 0.30 0.70 recommended pcb-footprint dra_qfn24-1_pack_1, 10:1 top
ic-nzn n-type laser diode driver rev b1, page 4/ 17 absolute maximum ratings beyond these values damage may occur; device operation is not guaranteed. item symbol parameter conditions unit no. min. max. g001 vdd voltage at vdd -0.7 6 v g002 i(vdd) current in vdd dc current -2 1200 ma g003 i(ci) current in ci v(lda) = 0 -2 5 ma g004 i(nerr) current in nerr -2 20 ma g005 i(md) current in md -2 20 ma g006 i()dig current in ep, en, ttl, rege, nslp, avg, cid -2 20 ma g007 i(ldk) current in ldk dc current -2 1200 ma g008 i(lda) current in lda dc current -2 1200 ma g009 i(rsi) current in rsi -2 20 ma g010 i(vsy) current in vsync -2 50 ma g011 i(syn) current in sync -2 50 ma g012 i(imon) current in imon -2 20 ma g013 v()c voltage at rsi, vsy, syn, ep, en, ttl, rege, avg, cid, rgnd, md, ci, imon, rvdd, lda, nerr, nslp -0.7 6 v g014 v()h voltage at ldk -0.7 15 v g015 vd() esd susceptibility at all pins hbm, 100 pf discharged through 1.5 k
2 kv g016 tj operating junction temperature -40 190 c g017 ts storage temperature range -40 190 c thermal data operating conditions: vdd = 3...5.5 v item symbol parameter conditions unit no. min. typ. max. t01 ta operating ambient temperature range -20 85 c t02 rthja thermal resistance chip/ambient surface mounted, thermal pad soldered to ca. 2 cm2 heat sink 30 40 k/w all voltages are referenced to ground unless otherwise stated. all currents ?owing into the device pins are positive; all currents ?owing out of the device pins are negative. p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 5/ 17 electrical characteristics operating conditions: vdd = 3...5.5 v, vsy = 0 v...vdd, tj = -20...125 c, nslp = hi, cid = lo; unless otherwise stated item symbol parameter conditions unit no. min. typ. max. total device 001 vdd permissible supply voltage 3 5.5 v 002 vsy permissible supply voltage at vsy vsy vdd 3 5.5 v 003 ioff(vdd) supply current in vdd nslp = lo, all other input pins set to lo 5 50 a 004 idc(vdd) supply current in vdd rsi 680
10 15 ma 005 i(vsy) supply current in vsy syn pin open 10 a 006 tab thermal shutdown threshold 130 196 c 007 vddon power-on threshold 1.7 2.8 v 008 vc()hi clamp voltage hi at rsi, ttl, rege, md, ci, lda, nslp, imon i() = 0.1 ma, other pins open, vdd = 0 0.3 1.5 v 009 vc()hi clamp voltage hi to vsy at syn i() = 1 ma, other pins open, vsy = 0 0.3 1.5 v 010 vc()hi clamp voltage hi at ldk i() = 1 ma, other pins open 12 v 011 vc()lo clamp voltage lo at vdd, avg, md, imon, cid, ep, en, ttl, vsy, syn, rgnd, rvdd, ldk, agnd, ci, lda, rsi, rege, nslp, nerr i() = 1 ma, other pins open -1.5 -0.65 -0.3 v 012 vc()hi clamp voltage hi at vsy, ep, en i() = 1 ma, other pins open, vdd = 0 6 v current monitor rsi, lda 101 v(rsi) voltage at rsi 430 520 580 mv 102 rsi permissable resistor at rsi vdd = 3...3.5 v 2.5 9 k
vdd = 4.5...5.5 v 0.68 9 k
103 vlda lda voltage monitor threshold vdd v(lda), v(rsi) = vdd 400 500 630 mv 104 ierr(lda) maximum unlimited current from lda without error signaling v(rsi) = vdd; vdd = 4.5...5.5 v 400 880 ma vdd = 3...3.5 v 260 630 ma 105 cmin(lda) minimum capacitor needed at lda 100 nf 106 rilda current ratio i(lda)max / i(rsi) v(lda) = 0 v vdd = 4.5...5.5 v 470 610 vdd = 3...3.5 v 430 610 107 rildk current ratio i(ldk)max / i(rsi) v(ldk) = v(rege) = v(ttl) = v(ep) = vdd, v(md) = 0 v vdd = 4.5...5.5 v 400 960 vdd = 3...3.5 v 480 870 108 i(ldk) maximum limited current rsi = 0.68 k
vdd = 5.5 v 630 ma 109 rdis(lda) discharge resistor at lda nslp = lo, v(lda) = vdd 1 20 k
reference 201 v(md) v(md) v(rgnd), v(rvdd) v(md) for p-type ld or acc closed control loop 460 510 560 mv 202 dv(md) temperature drift of voltage at md closed control loop 120 v/c 203 v(md) v(md) v(rgnd) v(ep) = 0 v, v(avg) = 0 v, n-type ld 460 510 560 mv digital inputs/outputs 301 vin() input voltage range at ep, en ttl = lo, vdd = 3.0...5.5 v 0.6 vdd - 1.4 v 302 vd() input differential voltage at ep, en ttl = lo, vd() = |v(ep) - v(en)| 200 mv 303 r() differential input impedance at ep, en ttl = lo 0.6 3 k
v(ep), v(en) < vdd 1.5 v 304 vt(ep)hi input threshold voltage hi at ep ttl = hi, en = open 2 v 305 vt(ep)lo input threshold voltage lo at ep ttl = hi, en = open 0.8 v p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 6/ 17 electrical characteristics operating conditions: vdd = 3...5.5 v, vsy = 0 v...vdd, tj = -20...125 c, nslp = hi, cid = lo; unless otherwise stated item symbol parameter conditions unit no. min. typ. max. 306 vhys(ep) hysteresis at ep ttl = hi, en = open 40 mv 307 ipd(ep) pull-down current at ep ttl = hi, en = open, v() = 1 v...vdd 0.5 5 a 308 vt()hi input threshold voltage hi at ttl, rege, nslp, avg, cid 2 v 309 vt()lo input threshold voltage lo at ttl, rege, nslp, avg, cid 0.8 v 310 vhys() hysteresis at ttl, rege, nslp, avg, cid 140 230 mv 311 ipu() pull-up current at ttl, rege v() = 0...vdd 1.2 v -60 -2 a 312 ipd() pull-down current at nslp, avg, cid v() = 1 v...vdd 2 130 a 313 vs()hi saturation voltage hi at syn vs(syn)hi = vsy v(syn), i() = -1 ma, vsy = vdd, ep = ttl = high, en = open 0.4 v 314 vs()lo saturation voltage lo at syn i() = 1 ma, ttl = high, vsy = vdd, ep = low, en = open 0.4 v 315 isc()hi short-circuit current hi at syn ep = ttl = high, en = open, v(syn) = 0 v, vsy = vdd -40 -3 ma 316 isc()lo short-circuit current lo at syn ep = ttl = high, en = open, v(syn) = 0 v, vsy = vdd 3 25 ma 317 i(nerr) current in nerr v(nerr) > 0.6 v, error 1 20 ma 318 vs()lo saturation voltage lo at nerr i() = 1 ma, error 600 mv laser driver ldk, ci, imon 401 vs(ldk)lo saturation voltage lo at ldk i(ldk) = 300 ma, rsi = 680
, vdd=4.5...5.5 v 1.6 3 v i(ldk) = 100 ma, rsi = 680
vdd=4.5...5.5 v 1.2 2 v i(ldk) = 60 ma, rsi = 2.5 k
vdd=3...3.5 v 0.8 1.3 v 402 idc(ldk) permissible dc current in ldk 300 ma 403 vo() permissible voltage at ldk 12 v 404 c(ci) required capacitor at ci 0 10 nf 405 |i(ci)| charge current from ci ic active, rege = hi, v(ci) = 1 v, cid = 0 v 0 a ic active, rege = hi, v(ci) = 1 v, cid = vdd 20 65 a 406 ipd(ci) pull-down current in ci ic active, rege = lo, cid = hi, v(ci) = 1 v, vdd = 3...5.5 v 0.3 2.6 a 407 imon() current at imon v(imon) = vdd 0.5 v, i(ldk) < 300 ma, vdd = 4.5...5.5 v 1/280 1/200 i(ldk) 408 imin(ldk) minimum permissible current pulse 0.5 ma 409 imax(ldk) maximum obtainable current from the driver v(rege) = v(ttl) = v(ep) = vdd, v(md) = 0 v; vdd = 4.5...5.5 v 300 ma vdd = 3...4.5 v 90 ma timing 501 twu time to wakeup: nslp lo ! hi to system enable clda = 1 f, rsi = 680
300 s 502 tr laser current rise time vdd = 5 v see fig. 2 1.5 ns 503 tf laser current fall time vdd = 5 v see fig. 2 1.5 ns 504 tp propagation delay v(epx, enx) ! i(ldkx) vdd = 5 v 10 ns p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 7/ 17 electrical characteristics: diagrams figure 1: reference levels figure 2: laser current pulse p r e l i m i n a r y p r e l i m i n a r y t v vt()hivt()lo vdd?0.45v 0.45v 0 1 input/output i(led) t i pk 10% i pk 90% i pk t r t f
ic-nzn n-type laser diode driver rev b1, page 8/ 17 description of functions ic-nzn is a laser diode pulse driver. the device fea- tures the following functions: ? peak or averaging control ? optical power (apc) or current control (acc) ? pulses of up to 155 mhz in controlled burst mode ? laser current limitation ? extension of the laser current with few external com- ponents ? operation of blue laser diodes possible ? error signalling for overcurrent ? sleep mode with less than 50 a consumption optical power control the ic-nzn supports the control of the laser diodes optical output power for all common laser diode pin con?gurations (n, p and m). the control is enabled with pin rege set to high. with avg set to low, the peak power control is enabled. the laser power level is selected by means of the resistor rmon (= rmd + pmd). this control mode can be used for frequencies up to ca. 4 mhz. for higher frequencies the averag- ing control (avg = high) or the burst mode have to be used. tables 4 and 5 show how to set the inputs for laser control depending on the input interface selected (ttl or lvds). laser control in ttl mode (ttl = high/open) ep en nslp rege syn mode - - low/open - - power-save mode low/open open high - low lda charged, laser off high open high high/open high lda charged, laser on, peak control high open high low high lda charged, laser on, burst mode table 4: laser control in ttl mode laser control in lvds mode (ttl = low) ep en nslp rege syn mode - - low/open - - power-save mode < en > ep high - low lda charged, laser off > en < ep high high/open high lda charged, laser on, peak control > en < ep high low high lda charged, laser on, burst mode table 5: laser control in lvds mode rmon dimensioning peak control (avg = low): in order to calculate the right value of rmon, the value of im (monitor current with respect to optical output power) of the laser diode must be known. rmon must be chosen in a way that the monitor current generated by the desired output power creates a voltage drop across rmon of 500 mv (cf. electrical characteristics no. 201). averaging control (avg = high): in this mode the cal- culation is the same as in peak control, only the result has to be divided by the duty cycle of the laser pulses, d = t . at a duty cycle of e.g. 50% d = 1 2 . this re- quires an external averaging capacitor of suf?cient size at pin ci though. control modes averaging operation mode rmon calculation avg = 0 peak control rmon = v ( md ) im avg = 1 averaging control rmon = v ( md ) im d table 6: rmon dimensioning example by way of example, an output level of 1 mw is to be set. with an optical power of 1 mw e.g. laser diode hl6339g has a typical monitor current (im) of 15 a. the following value is then obtained for the resistor at pin md (rmon = pmd + rmd, where rmd is a ?xed resistor and pmd a potentiometer.): p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 9/ 17 rmon = v ( md ) im = 0.5 v 15 a = 33.34 k
external capacitor mode in applications where an external capacitor is required (see best performance recommendations below), the external capacitor mode must be enabled (pin cid = high). this connects the capacitor to the control cir- cuit and additionally enables a pull-down current at pin ci to prevent this capacitor from being charged due to residual currents (cf. electrical characteristics no. 406). best performance recommendations the operating point for the laser diode is stored in an on-chip capacitor. this permits a fast start-up but can lead to an unstable control circuit under certain condi- tions such as inadequate pcb layout or laser diodes with very low monitor current. in these cases, an op- tional capacitor can be connected as close as possible to the chip, across pin ci and cis. this will prevent instability of the control circuit. for averaging control a 10 nf capacitor at ci is recommended. special care must be taken in pcb layout when laying out the path from the laser diodes cathode via pin ldk to agnd. this path must be kept as short as possible to avoid parasitic inductances. a sbubber network across the laser diode helps to compensate for these parasitic in- ductances. figures 3 , 4 and 5 show the typical set-up for the dif- ferent n, p and m-type diode con?gurations. n-type diodes figure 3: circuit example for n-type laser diodes p-type diodes althought this kind of laser diodes are supported by ic- nzn, its strongly recommended to use ic-nzp instead since in this con?guration, all the pulses at ldk will be coupled directly to pin md due to monitor diodes internal capacitance, thus making an accurate control much more dif?cult. moreover, applications with p-type laser diode case grounded are possible with ic-nzp only. p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 10/ 17 figure 4: circuit example for p-type laser diodes. m-type diodes figure 5: circuit example for m-type laser diodes althought this type of laser diode are supported by ic- nzn, its strongly recommended to use ic-nzp instead since in this con?guration, all the pulses at ldk will be coupled directly to pin md due to monitor diodes in- ternal capacitance, thus making an accurate control much more dif?cult. moreover, applications with m- type laser diode case grounded are possible with ic- nzp only. p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 11/ 17 laser current limitation figure 6: ic-nzn lda current limitation ic-nzn features two different current limitations, limit- ing the average current ?owing from pin lda plus the current ?owing into pin ldk. lda current limitation ic-nzn monitors the average laser current ?owing from pin lda (figure 6 ). the dc current limit is set by means of a resistor at pin rsi. when dimensioning resistor rsi the following applies (cf. electrical characteristics no. 106): i max ( lda ) = 540 0.5 v rsi the current limitation can be disabled by connecting pin rsi to vdd. short pulses at lda with higher currents are possi- ble as only the dc current is monitored and capacitor clda supplies the current for short pulses. ldk current limitation the control circuit also monitors the laser current in pin ldk and limits this current when reaching the thresh- old also de?ned by rsi. the following applies (cf. elec- trical characteristics no. 107): i max ( ldk ) = 520 0.5 v rsi burst mode in controlled burst mode ic-nzn can pulse with up to 155 mhz. controlled here means that a pre-set oper- ating point is maintained during the burst phase . therefore an operating point is settled ?rst, for which pin rege has to be high and the laser diode must be switched on. once the operating point has been reached the laser diode can be switched off again. the operating point is stored in an on-chip capacitor and when pin rege is set to low, the burst mode is acti- vated. the pre-set operating point is maintained. for a longer burst mode, an external capacitor can be connected to pin ci. to prevent the laser current from rising due to residual currents, the capacitor is discharged then with a maximum of 150 na (cf. elec- trical characteristics no. 406). as the capacitor is dis- charged gradually, the output level must be re-settled again after a certain period, depending on the admis- sible degradation of the laser output power. p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 12/ 17 current control the ic-nzn also supports laser current control, when no monitor diode is present. for that purpose, a frac- tion of the current ?owing trough the laser diode is pro- vided at imon pin (ildk / 240, cf. electrical charac- teristics no. 407). tables 7 and 8 show how to set the inputs for laser control depending on the input interface selected (ttl or lvds). laser control in ttl mode (ttl = high/open) ep en nslp avg rege syn mode - - low/open - - - power save mode low/open open high - - low lda charged, laser off high open high high high/open high lda charged, laser on, regulated table 7: laser control in ttl mode laser control in lvds mode (ttl = low) ep en nslp avg rege syn mode - - low/open - - - power save mode < en > ep high - - low lda charged, laser off > en < ep high high high/open high lda charged, laser on, regulated table 8: laser control in lvds mode the laser current is set by means of resistor rmon (= rmd + pmd). rmon = v ( rvdd ) v ( md ) imon figure 7 shows the typical set-up for current control. external capacitor mode in applications where an external capacitor is required (see best performance recommendations below), the external capacitor mode must be enabled (pin cid = high). this connects the capacitor to the control cir- cuit and additionally enables a pull-down current at pin ci to prevent this capacitor from being charged due to residual currents (cf. electrical characteristics no. 406). best performance recommendations the operating point for the laser diode is stored in an on-chip capacitor. this permits a fast start-up but can make the regulated system unstable under cer- tain conditions such as inadequate pcb layout. in these cases, an optional capacitor can be connected as close as possible to the chip, across pins ci and cis. special care must be taken in pcb layout when laying out the path from the laser diodes cathode via pin ldk to agnd. this path must be kept as short as possi- ble to avoid parasitic inductances. a snubber network across the laser diode also helps to compensate for these parasitic inductances. p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 13/ 17 figure 7: example set-up for current control blue laser diodes with the ic-nzn also blue laser diodes can be driven. due to the high forward voltage of these laser diodes, an appropriate supply voltage must be provided. the current limitation at pin lda cannot be used then, since only pin ldk is capable of handling the higher voltage required for the blue laser diodes. nevertheless, the current limitation protection in pin lkd (cf. electrical characteristics no. 107) is still active. figure 8 shows a typical set-up for blue laser diodes with apc and ?g- ure 9 with acc. figure 8: set-up for blue laser diodes with apc p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 14/ 17 figure 9: set-up for blue laser diodes with acc sleep mode the ic-nzn has a very low consumption sleep mode , e.g. for battery powered applications. with pin nslp set to low the chip enters the sleep mode and discon- nects pin lda from the supply. the wake-up time from this sleep mode is about 300 s. p r e l i m i n a r y p r e l i m i n a r y

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ic-nzn n-type laser diode driver rev b1, page 15/ 17 evaluation board ic-nzn comes with an evaluation board for test purpose. figures 10 and 11 show both the schematic and the component side of the evaluation board. figure 10: schematic of the evaluation board p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 16/ 17 figure 11: evaluation board (component side) ic-haus expressly reserves the right to change its products and/or speci?cations. an info letter gives details as to any amendments and additions made to the relevant current speci?cations on our internet website www.ichaus.de/infoletter ; this letter is generated automatically and shall be sent to registered users by email. copying C even as an excerpt C is only permitted with ic-haus approval in writing and precise reference to source. ic-haus does not warrant the accuracy, completeness or timeliness of the speci?cation and does not assume liability for any errors or omissions in these materials. the data speci?ed is intended solely for the purpose of product description. no representations or warranties, either express or implied, of merchantability, ?tness for a particular purpose or of any other nature are made hereunder with respect to information/speci?cation or the products to which information refers and no guarantee with respect to compliance to the intended use is given. in particular, this also applies to the stated possible applications or areas of applications of the product. ic-haus conveys no patent, copyright, mask work right or other trade mark right to this product. ic-haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. as a general rule our developments, ips, principle circuitry and range of integrated circuits are suitable and speci?cally designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. in principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the bureau of statistics in wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in hanover (hannover-messe). we understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. p r e l i m i n a r y p r e l i m i n a r y
ic-nzn n-type laser diode driver rev b1, page 17/ 17 ordering information type package order designation ic-nzn qfn24 4 mm x 4 mm ic-nzn qfn24 evaluation board ic-nzn eval nzn1d for technical support, information about prices and terms of delivery please contact: ic-haus gmbh tel.: +49 (61 35) 92 92-0 am kuemmerling 18 fax: +49 (61 35) 92 92-192 d-55294 bodenheim web: http://www.ichaus.com germany e-mail: sales@ichaus.com appointed local distributors: http://www.ichaus.com/sales_partners p r e l i m i n a r y p r e l i m i n a r y

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