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ic-nzp p-type laser diode driver rev b1, page 1/ 15 features ? peak value controlled laser 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 (p/m/n con?gurations) ? 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 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-nzp p-type laser diode driver rev b1, page 2/ 15 description laser diode pulse driver ic-nzp 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 an ex- ternal resistor at pin rsi. when the current limit is reached, overcurrent is signalled at nerr and the current from pin vcca is limited to the pre-set value but the ic is not shut down. there is an additional current limitation in pin lda 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 gnd ground 3 md apc setup, monitor input 4 imon laser current monitor 5 ncid disable 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 lda laser diode anode 14 ci power control capacitor 15 cis power control capacitor sense 16 vddl laser power supply 17 vdda analogue power supply 18 avg averaging control enabled 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 ( nzp 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 p c ode . . . .. .
ic-nzp p-type laser diode driver rev b1, page 3/ 15 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-nzp p-type laser diode driver rev b1, page 4/ 15 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, ncid -2 20 ma g007 i(vddl) current in vddl dc current -2 1200 ma g008 i(vdda) current in vdda dc current -1200 2 ma g009 i(lda) current in lda dc current -1200 2 ma g010 i(rsi) current in rsi -2 20 ma g011 i(vsy) current in vsy -2 50 ma g012 i(syn) current in syn -2 50 ma g013 i(imon) current in imon -20 2 ma g014 v()c voltage at rsi, vsy, syn, ep, en, ttl, rege, avg, ncid, rgnd, md, ci, imon, rvdd, lda, nerr, nslp -0.7 6 v g015 vd() esd susceptibility at all pins hbm, 100 pf discharged through 1.5 k
4 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 (extended range on request) -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-nzp p-type laser diode driver rev b1, page 5/ 15 electrical characteristics operating conditions: vdd = 3...5.5 v, vsy = 0 v...vdd, tj = -40...85 c, nslp = hi, ncid = hi; 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 toff 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, vdda, vddl, nslp, imon, ncid, avg i() = 0.1 ma, other pins open, vdd = 0 0.3 1.6 v 009 vc(syn)hi clamp voltage hi to vsy i() = 1 ma, other pins open, vsy = 0 0.3 1.5 v 010 vc()lo clamp voltage lo at vdd, avg, md, imon, ncid, ep, en, ttl, vsy, syn, rvdd, vddl, vdda, ci, lda, rsi, rege, nslp, nerr i() = -1 ma, other pins open -1.5 -0.65 -0.3 v 011 vc(vsy)hi clamp voltage hi at vsy i() = 1 ma, other pins open, vdd = 0 6 v current monitor rsi, vdda, vddl, lda 101 v(rsi) voltage at rsi 420 500 580 mv 102 rsi permissible resistor at rsi vdd = 3...3.5 v 2.5 9 k
vdd = 4.5...5.5 v 0.68 9 k
103 v(vdda) vdda voltage monitor threshold vdd v(vdda), v(rsi) = vdd 400 500 620 mv 104 v(vddl) permissible voltage at vddl when not connected to vdda 0 v(vdd) 105 ierr(vdda) maximum current from vdda without error signalling v(rsi) = vdd; vdd = 4.5...5.5 v -980 -400 ma vdd = 3...3.5 v -820 -270 ma 106 cmin() minimum capacitor required at vdda 100 nf 107 rivdda current ratio i(vdda)max / i(rsi) v(vdda) = 0 v; vdd = 3...5.5 v 460 630 108 rilda current ratio i(lda)max / i(rsi) v(rege) = v(ttl) = v(ep) = vdd, v(lda) = 0 v, v(md) = 0; vdd = 3...5.5 v 470 970 109 i(lda) maximum limited current rsi = 680
, vdd = 5.5 v -630 ma 110 rdis() discharge resistor at vdda nslp = lo, v(vdda) = vdd 1 20 k
reference 201 v(md) reference voltage v(md) v(rgnd), v(rvdd) v(md) for p-type ld, closed control loop 210 250 320 mv 202 dv(md) temperature drift of voltage at md closed control loop 120 v/c 203 v(md) precharge reference voltage v(rvdd) v(md); v(ep) = 0, v(avg) = 0, p-type md 230 280 360 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 v(ep), v(en) < vdd 1.5 v, ttl = lo 0.6 3 k
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-nzp p-type laser diode driver rev b1, page 6/ 15 electrical characteristics operating conditions: vdd = 3...5.5 v, vsy = 0 v...vdd, tj = -40...85 c, nslp = hi, ncid = hi; 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, ncid 2 v 309 vt()lo input threshold voltage lo at ttl, rege, nslp, avg, ncid 0.8 v 310 vhys() hysteresis at ttl, rege, nslp, avg, ncid 130 230 mv 311 ipu() pull-up current at ttl, rege, ncid v() = 0...vdd 1.2 v -60 -2 a 312 ipd() pull-down current at nslp, avg 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 = hi, en = open 0.4 v 314 vs()lo saturation voltage lo at syn i() = 1 ma, vsy = vdd, ttl = hi, ep = lo, en = open 0.4 v 315 isc()hi short-circuit current hi at syn ep = ttl = hi, en = open, v(syn) = 0 v, vsy = vdd -40 -3 ma 316 isc()lo short-circuit current lo at syn ttl = hi, ep = lo, en = open, v(syn) = vsy, vsy = vdd 3 40 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 lda, ci, imon 401 vs(lda)hi saturation voltage hi at lda vs(lda)hi = v(vddl) v(lda); rsi = 680
i(lda) = 300 ma, vdd = 4.5...5.5 v 1.6 2.2 v i(lda) = 100 ma, vdd = 4.5...5.5 v 1.2 2 v i(lda) = 60 ma, rsi = 2.5 k
vdd = 3...3.5 v 0.8 1.3 v 402 idc(lda) permissible dc current in lda -300 ma 403 c(ci) required capacitor at ci 0 10 nf 404 |i(ci)| charge current from ci ic active, rege = hi, v(vdd) v(ci) = 1 v; ncid = hi 0 a ncid = lo 20 60 a 405 ipu(ci) pull-up current in ci ic active, rege = ncid = lo, v(rsi) = vdd, v(ci) = 0 v...vdd 1 v -2.6 -0.3 a 406 imon() current at imon v(imon)=0.5v; 1/330 1/210 i(lda) i(lda) < 100 ma, vdd = 3...4.5 v i(lda) < 300 ma, vdd = 4.5...5.5 v timing 501 twu time to wakeup: nslp lo ! hi to system enable cvdda = 1 f, rsi = 1 k
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(ldax) 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-nzp p-type laser diode driver rev b1, page 7/ 15 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-nzp p-type laser diode driver rev b1, page 8/ 15 description of functions ic-nzp is a laser diode pulse driver, which features: ? averaging or peak control ? optical power or current control ? laser current limitation ? pulses of up to 155 mhz in controlled burst mode ? sleep mode with less than 50 a consumption ? extension of the laser current with few external com- ponents ? error signalling for overcurrent optical power control the ic-nzp supports the control of the laser diodes optical output power (apc) for all common laser diode pin con?gurations (p, n 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 vdda charged, laser off high open high high/open high vdda charged, laser on, regulated high open high low high vdda 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 vdda charged, laser off > en < ep high high/open high vdda charged, laser on, regulated > en < ep high low high vdda 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 250 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 . p r e l i m i n a r y p r e l i m i n a r y
ic-nzp p-type laser diode driver rev b1, page 9/ 15 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 hl6342g 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.): rmon = v ( md ) im = 0.25 v 15 a = 16.67 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 ncid = low). 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 with very low monitor current. in that cases, an external capaci- tor is to 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 ca- pacitor at ci is recommended. special care must be taken in pcb layout when laying out the path from the laser diodes cathode to gnd. this path must be kept as short as possible to avoid parasitic inductances. a snubber network across the laser diode also helps to compensate for these parasitic inductances. figures 3 , 4 and 5 show the typical set-up for the dif- ferent p, n and m-type diode con?gurations. p-type diodes figure 3: circuit example for p-type laser diodes (case grounded) 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-nzp p-type laser diode driver rev b1, page 10/ 15 m-type diodes figure 4: circuit example for m-type laser diodes (case grounded) n-type diodes although this type of laser diodes are supported by ic-nzp, its strongly recommended to use ic-nzn in- stead, since in this con?guration all the pulses at lda will be coupled directly to pin md due to monitor photo diodes internal capacitance. thus making an accurate control much more dif?cult. figure 5: circuit example for n-type laser diodes 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-nzp p-type laser diode driver rev b1, page 11/ 15 laser current limitation figure 6: ic-nzp vdda current limitation ic-nzp monitors the average laser current ?owing from pin vdda (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. 107): i max ( vdda ) = 540 0.5 v rsi if no current limitation is required, pin rsi must be con- nected to vdd to disable this feature. short pulses at vdda with higher currents are possi- ble as only the dc current is monitored and capacitor cvdda supplies the current for short pulses. burst mode in controlled burst mode ic-nzp 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 must be switched on. once the operating point has been reached the laser can be switched off again. the oper- ating point is stored in an on-chip capacitor and when rege is set to low, the burst mode is activated. the pre-set operating point is maintained. to prevent the laser current from rising due to residual currents, the capacitor is discharged with a maximum of 150 na (cf. electrical characteristics no. 405). for a longer burst mode, an external capacitor can be connected to pin ci. as the capacitor is discharged gradually, the out- put level must be re-settled again after a certain period, depending on the admissible degradation of the laser output power. current control the ic-nzp also supports laser current control, when no monitor diode is present. for that purpose, a frac- tion of the current ?owing trough the laser is provided at imon pin (ilda / 280, cf. electrical characteristics no. 406). the laser current is set by means of resistor rmon (= rmd + pmd). rmon = 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 (ncid pin set to low). 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 with very low monitor current. in that cases, an external capaci- tor is to be connected as close as possible to the chip, across pin ci and cis. this will prevent instability of the control circuit. setting avg to hi, keeps the control loop always on and settled, thus improving the dynamic performance. 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-nzp p-type laser diode driver rev b1, page 12/ 15 special care must be taken in pcb layout when laying out the path from the laser diodes cathode to gnd. this path must be kept as short as possible to avoid parasitic inductances. a snubber network across the laser diode also helps to compensate for these para- sitic inductances. figure 7: example set-up for current control sleep mode the ic-nzp has a very low consuption mode that per- mits hibernation in battery powered applications. set- ting the nslp pin to low drives the chip into a state where the vdda pin is disconnected as supply and pulled down. the wake up from sleep time 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-nzp p-type laser diode driver rev b1, page 13/ 15 evaluation board ic-nzp comes with an evaluation board for test purpose. figures 8 and 9 show both the schematic and the component side of the evaluation board. figure 8: 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-nzp p-type laser diode driver rev b1, page 14/ 15 figure 9: 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-nzp p-type laser diode driver rev b1, page 15/ 15 ordering information type package order designation ic-nzp qfn24 4 mm x 4 mm ic-nzp qfn24 evaluation board ic-nzp eval nzp1d 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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