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august, 27th 2009 automotive grade auips7121r www.irf.com subject to change without notice 1 current sense high side switch features ? suitable for 24v systems over current shutdown ? ? over temperature shutdown n/off for emi sfet on) lly protected five terminal high ? current sensing ? active clamp ? optimized turn o ? reverse battery protection (mo applications amp ? 75w filament l ? solenoid ? 24v loads for trucks description is a fu the auips7121r side switch specifically designed for driving lamp. it features current sensing, ov er-current, over-temperature, esd protection and drain to source active clamp. when the input voltage vcc - vin is higher than the specified threshold, the output power mosfet is turned on. when the vcc - vin is lower than the specified vil threshold, the output mosfet is turned off. t he ifb pin is used for current sensing. the over-current shutdown is higher than inrush current of the lamp. product summary rds(on) 30m ? max. vclamp 65v current shutdown 50a min. packages dpak typical connection out auips7121r in rifb vcc load battery input power ground ifb logic ground current feeback 10k on off downloaded from: http:///
auips7121r qualification information ? automotive (per aec-q100 ?? ) qualification level comments: this family of ics has passed an automotive qualification. irs industrial and consumer qualificat ion level is granted by extension of the higher automotive level. moisture sensitivity level dpak-5l msl1, 260c (per ipc/jedec j-std-020) machine model class m2 (200 v) (per aec-q100-003) human body model class h1c (1500 v) ( per aec-q100-002 ) esd charged device model class c5 (1000 v) (per aec-q100-011) ic latch-up test class ii, level a (per aec-q100-004) rohs compliant yes ? qualification standards can be found at international rectifiers web site http://www.irf.com/ ?? exceptions to aec-q100 requirements are noted in the qualification report. www.irf.com 2 downloaded from: http:///
auips7121r absolute maximum ratings absolute maximum ratings indicate sustained limits beyond wh ich damage to the d cur. (tambient=25c unless otherwise specified). arameter evice may oc symbol p min. max. units vout maximum output voltage vcc-60 vcc+0.3 v vcc-vin max. maximum vcc voltage -32 60 v iifb, max. maximum feedback current -50 10 ma vcc sc maximum vcc voltage with short circuit protection see page 7 v ? 50 maximum power dissipation (internally limited protection) by thermal pd rth=50c/w dpack 6cm2 footprint ? 2.5 w tj max. max. storage & operating junction temperature -40 150 c thermal characteristics mbol max. units sy parameter typ. rth1 thermal resistance junction to ambient dpak std footprint ? 70 rth2 tion to ambient dpak 6cm2 footprin ? thermal resistance junc t 50 rth3 thermal resistance junction to case dpak ? c/w 2 recommended operating conditions these values are giv en for a quick design. s min. max. units ymbol parameter continuous output current, tambient=85c, tj=125c i ? 3.8 a out rth=50c/w, dpak 6cm2 footprint rifb ifb resistor 1.5 ? k ? www.irf.com 3 downloaded from: http:///
auips7121r static electrical characteristics meter min. typ. max. units test conditions tj=25c, vcc=28v (unless otherwise specified) symbol para vcc op. operating voltage range 6 ? 60 v on state resistance tj=25c ? 24 30 rds(on) 150c(2) ? 45 55 m ? on state resistance tj= ids=2a icc off supply leakage current ? 2 4 iout off output leakage current ? 2 4 a vi c=28 ifb=v vout=vgnd n=vc v,v gnd iin on ma vcc in=28v input current when device on 1 2.5 4 -v v clamp1 cc to vout clamp voltage 1 id=10ma v 60 64 ? v clamp2 65 72 id=20a see fig. 2 vcc to vout clamp voltage 2 60 vih(1) high level input threshold voltage ? 3.5 5.9 id=10ma vil(1) low level input threshold voltage 1.5 3.2 ? v rds(on) rev r te resist everse on sta ance tj=25c ? 25 40 m ? isd=2a f .85 orward body diode voltage tj=25c ? 0.75 0 vf f 7 v i orward body diode voltage tj=125c ? 0.62 0. f=3a rin in 0 ? put resistor 180 250 35 (1) input threshold in and the tab. min. typ. max. units o n s are measured dire ctly between the input p switching electrical characteristics vcc=28v, resistive load=6.8 ? , tj=25c p symbol arameter test c nditio s tdon t 30 urn on delay time 6 15 tr r s ise time from 20% to 80% of vcc 5 10 30 tdoff turn off delay time 25 50 100 tf fall time from 80% to 20% of vcc 6 15 30 s see fig. 1 protection characteristics tj=25c, vcc=28v (unless otherwise specified) symbol parameter min. typ. max. units test conditions tsd over temperature threshold(2) 150 165 ? c see fig. 3 and fig. 11 isd over-current shutdown 50 60 80 a see fig. 3 and page 7 i fault ifb after an over-current or an over- temperature (latched) 2.7 3.3 4 ma see fig. 3 current sensing characteristics tj=25c, vcc=28v (unless other wise specified), vcc-vifb>4v symbol parameter min. typ. max. units test conditions ratio i load / ifb current ratio 7050 8500 9950 iload=5a ratio_tc i load / ifb variation over temper ature(2) -5% 0 +5 % tj=-40c to +150c i offset load current offset -0.6 0 0.6 a iout<5a ifb leakage ifb leakage current 0 10 100 a iout=0a (2) guaranteed by design www.irf.com 4 downloaded from: http:///
auips7121r lead assignments 1- nc 2- in - vcc 3 4- ifb t 5- ou 1 2 4 5 ak vcc dp 3- functiona all values are typ l block diagram ical diag charge pump driver ifb out vcc 75v 250 ? tj > 165c iout > 60a 60v 75v - + 75v in set reset latch q 1.5ma 3v + - reverse battery protection www.irf.com 5 downloaded from: http:///
auips7121r truth table op. conditions input output ifb pin voltage normal mode h l 0v normal mode l h i load x rfb / ratio open load h l 0v open load l h ifb leakage x rifb short circuit to gnd h l 0v short circuit to gnd l l i fault x rifb(latched) over temperature h l 0v over temperature l l i fault x rifb (latched) operating voltage maximum vcc voltage : this is the maximum voltage before the breakdown of the ic process. operating voltage : this is the vcc range in which the functionalit y of the part is guaranteed. the aec-q100 qualification is run at the maximum operating voltage spe cified in the datasheet. reverse battery during the reverse battery the mosfet is turned on if the input pin is powered with a diode in parallel of the input transistor . power dissipation in the ips : p = rdson rev * i l oad2 + vcc2 / 250 ( internal input resistor ). if the power dissipation is too high in rifb, a diode in serial can be added to block the current. active clamp the purpose of the active clamp is to limit the voltage ac ross the mosfet to a value below the body diode break down voltage to reduce the amount of stress on the device during switching. the temperature increase during active clamp can be estimated as follows: ) t( z p clamp th cl tj ? = ? where: ) t( z clamp th is the thermal impedance at t clamp and can be read from the thermal impedance curves given in the data sheets. clavg cl cl i v p ? = : power dissipation during active clamp 65v v cl = : typical v clamp value 2 i i cl clavg = : average current during active clamp dt di i t cl cl = : active clamp duration l v v dt di cl battery ? = : demagnetization current figure 9 gives the maximum inductance vers us the load current in the worst case : the part switches off after an over temperature detection. if the load inductance exceeds the curve, a free wheeling diode is required. over-current protection the threshold of the over-current protec tion is set in order to guarantee that the device is able to turn on a load with an inrush current lower than the minimum of isd. nevertheles s for high current and high temperature the device may switch off for a lower current due to the over-temperature protection. this behavior is shown in figure 11. www.irf.com 6 downloaded from: http:///
auips7121r current sensing accuracy iout ifb ifb leakage ifb2 ifb1 iout1 i offset iout2 the current sensing is specif ied by measuring 3 points : - ifb1 for iout1 - ifb2 for iout2 - ifb leakage for iout=0 the ifb for any iout value using : , the accuracy of the system will depends on the variation of ratio_tc specified in page 4. the ioffset variation depends directly on the rdson : i offset@-40c= i offset@25c / 0.8 maximum vcc voltage with short circuit protection the maximum vcc voltage with short circuit is the maximum vo ltage for which the part is able to protect itself under test conditions representative of the applicati on. 2 kind of short circuits are cons idered : terminal and load short circuit. l sc r sc the parameters in the datasheet are computed with the following formula : ratio = ( iout2 C iout1 )/( ifb2 C ifb1) i offset = ifb1 x ratio C iout1 this allows the designer to evaluate ifb = ( iout + i offset ) / ratio if ifb > ifb leakage for some applications, a calibration is required. in that case the i offset and the ratio over the temperature range. the ratio variation is given by i offset@150c= i offset@25c / 1.9 out ips vcc l sc l supply 5h r supply 10mohm terminal sc 0.1 h 10 mohm load sc 10 h 100 mohm r sc www.irf.com 7 downloaded from: http:///
auips7121r t j tsd 165c ids vin i shutdown tshutdown vifb v fault figure 3 C protection timing diagram vds ids vcc-vin vout vcc-vin 80% 20% 80% 20% td on tr td off tf vcc vds clamp t clamp see application notes to evaluate power dissipation ctive clamp waveforms figure 2 C a figure 1 C in rise time & switching definitions 0 5 15 25 - 0 100 150 tj, junction temperature (c) figure 4 C icc off (a) vs tj (c) 20 10 icc off, supply leakage current (a) 50 50 www.irf.com 8 downloaded from: http:///
auips7121r www.irf.com 9 figure 8 C transient thermal impedance (c/w) vs time (s) ) h, transient thermal impedance (c/w zt time (s) 50% 100% 150% -50 0 50 100 150 200% fig c) tj, junction temperature (c) rds(on), drain-to-source on resistance (normalized) ure 7 - normalized rds(on) (%) vs tj ( 1 2 3 4 5 6 vih vil 0 -50 -25 0 25 50 75 100 125 150 tj, junction temperature (c) vih and vil (v) figure 6 C vih and vil (v) vs tj (c) 0 0 1 02 03 04 05 0 vcc-vin, supply voltage (v) iccoff, supply current (a) 2 4 0.01 0.10 1.00 10.00 100.00 1.e- 05 1.e- 04 1.e- 03 1.e- 02 1.e- 01 1.e+0 0 1.e+0 1 1.e+0 2 figure 5 C icc off(a) vs vcc-vin (v) downloaded from: http:///
auips7121r www.irf.com 10 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 02468 25c 150c 1 10 100 1.e+01 1.e+02 1.e+03 1.e+04 ifb, current feedback current (ma) max. output current (a) 1 0 inductance (h) iout, output current (a) fig h) ure 9 C max. iout (a) vs inductance ( figure 10 C ifb (ma) vs iout (a) figure 11 C tsd (s) vs i out (a) smd with 6cm2 tsd, time to shutdown(s) 0.0001 0.001 0.01 0.1 1 10 100 0 1 02 03 04 0 '-40c '+25c '+125c 5 0 iout, output current (a) downloaded from: http:///
auips7121r www.irf.com 11 case outline 5 lead C dpak downloaded from: http:///
auips7121r tape & reel 5 lead C dpak www.irf.com 12 downloaded from: http:///
auips7121r part marking information ordering information standard pack base part number package type form quantity complete part number tube 75 auips7121r tape and reel 3000 auips7121rtr tape and reel left 2000 auips7121rtrl auips7121r d-pak-5-lead tape and reel right 2000 AUIPS7121RTRR the information provided in this document is believed to be accurate and reliable. however, international rectifier assumes no responsibility for the consequences of the use of this information. international rectifier assumes no responsibility for any infringement of patents or of other rights of third parties which may result from the use of this information. no license is granted by implication or ot herwise under any patent or patent rights of international rectifier. the specifications ment ioned in this document are subject to change without notice. this document supersedes and replaces all inform ation previously supplied. for technical support, please contact irs technical assistance center http://www.irf.com/technical-info/ world headquarters: 233 kansas st., el segundo, california 90245 tel: (310) 252-7105 www.irf.com 13 downloaded from: http:///

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