1 features gate driver latch v ref control logic v cc out sense+ sense? cli gnd flag ctrl v t v t 5v p compatible inputs adjustable current limit thresholds external sense resistor flag signal to indicate output status package options 8l pdip & so narrow cs8312 igbt ignition predriver with dynamic current regulation 1 flag sense+ sense? gnd v cc ctrl cli out description block diagram absolute maximum ratings the cs8312 is a bipolar micropro- cessor interface ic designed to drive an igbt (or logic level mosfets) powering large induc- tive loads in harsh operating envi- ronments. the ic?s dynamic cur- rent limit function lets the micro- processor adjust the current limit threshold to the real time needs of the system. cli, the current limit input, sets the current limit for the igbt high or low as directed by the system microprocessor. cli also raises and lowers the threshold on the diag- nostic flag output signal. the flag output signals the micropro- cessor when the current level approaches current limit on the igbt. the ctrl input enables the flag function. cs8312 supply voltage.................................................................................-0.3v to +12v digital input currents....................................................................................2ma internal power dissipation (t a = 25c) .................................................700mw junction temperature range.....................................................-40c to +150c storage temperature range ......................................................-55c to +165c lead temperature soldering wave solder(through hole styles only).............10 sec. max, 260c peak reflow (smd styles only).............60 sec. max above 183c, 230c peak electrostatic discharge (human body model) ............................................2kv a company ? rev. 8/16/99 cherry semiconductor corporation 2000 south county trail, east greenwich, ri 02818 tel: (401)885-3600 fax: (401)885-5786 email: info@cherry-semi.com web site: www.cherry-semi.com
2 electrical characteristics 7v v cc 10v; -40c t a +125c; -0.2v differential ground voltage 0.8v; unless otherwise specified. parameter test conditions min typ max unit cs8312 general power supply 7 10 v including ripple voltage supply ripple frequency 10 60 khz differential ground frequency 10 60 khz quiescent current, i q turn on v ctrl = 5.5v 15 ma turn off v ctrl = -0.3v 5 ma supply voltage rejection v ctrl = 5.5v 30 db differential ground v ctrl = 5.5v 30 db rejection ratio differential ground current v ctrl = -0.3v 3 ma ratio (v sense- -v gnd )dc = 1v (v sense- -v gnd )ac = 0.6v unity gain bandwidth v ctrl = 5.5v 400 khz turn on delay ctrl increasing 30 us turn off delay ctrl decreasing 30 us control function input voltage range i ctrl = 2ma -0.3 5.5 v input threshold turn on ctrl increasing 3.5 v turn off ctrl decreasing 1.5 v hysteresis 0.4 2.0 v voltage i ctrl = 10a max 1.1 v input capacitance 50 pf current limit increase function input voltage range i ctrl = 2ma -0.3 5.5 v input threshold turn on cli increasing 3.5 v turn off cli decreasing 1.5 v hysteresis 0.4 2.0 v voltage i cli = 10a max 1.1 v input capacitance 50 pf output stage i out 5ma clamp voltage v ctrl = 5.5v; i out = 1ma 4.0 5.5 v output off voltage v ctrl = -0.3v; i out = 10a 0.5 v v ctrl = -0.3v; i out = 200a 1.2 v flag function output low v ctrl = 5.5v; i flag = 1.5ma 0.9 v leakage current v ctrl = -0.3v 10 a output capacitance 50 pf turn on (v sense+ ? v sense- )v ctrl = 5.5v; v cli = -0.3v 210 225 240 mv v ctrl = 5.5v; v cli = 5.5v 300 350 mv
3 parameter test conditions min typ max unit cs8312 package pin description package pin # pin symbol function 8l pdip & so 1 flag indicates whether current through the igbt has reached a pre- set level. 2 sense+ positive input to current comparator. 3 sense? ground (sense-) for current sense resistor. 4 gnd ground connection. 5 out output voltage to igbt (mosfet) gate. 6 cli current limit input increase. 7 ctrl control input. 8v cc supply voltage. the flag indicates when the voltage across the two sense pins is approaching a current limit level that has been determined by the value of the external sense resistor (r sense ) and the state of the ctrl and cli pins. if the voltage across the sense pins (sense+, sense-) is less than the flag turn-on voltage, then the flag is off. when the voltage between the sense pins equals the flag turn on voltage, the flag will latch on until the ctrl pin goes low. flag is disabled whenever ctrl is low. changing the cli pin from low to high will increase nominal flag turn on voltage by approximately 45%. table 1 flag timing sequence the cs8312 output (out) saturates and supplies voltage to the igbt (or mosfet) gate once the ctrl switches from low to high. as current through the igbt (mosfet) increases and the voltage across the sense resistor passes the flag turn on voltage, the flag will turn on. if the cur- rent through the sense resistor continues to rise and the sense resistor voltage reaches the regulation sense volt- age, then the gate voltage will fall to a level that regulates the driver and maintains the regulation sense voltage at the sense resistor. changing the cli pin from a logic low to a logic high increases the flag turn on voltage by approximately 45% and the regulation sense voltage by approximately 39% respectively. current limit function output stage state control sense+ flag 0 low x off 1 high below threshold off 2 high above threshold on 3 high x on 0 low x off flag function (see application diagram) circuit description flag function: continued turn off delay ctrl decreasing 10 us turn on delay 10 us disable time 100 450 us sense function input voltage range -0.3 2.5 v sense regulation voltage v ctrl = 5.5v; v cli = -0.3v 270 295 320 mv v ctrl = 5.5v; v cli = 5.5v 380 410 440 mv input leakage current v ctrl = 5.5v 5 a propagation delay v ctrl = 5.5v 20 us electrical characteristics 7v v cc 10v; -40c t a +125c; -0.2v differential ground voltage 0.8v; unless otherwise specified.
4 application and test diagram cs8312 flag sense+ sense? gnd v cc ctrl cli out cs8312 v cc v cc v ba t 0.1 f load r sense r microprocessor
part number description CS8312YN8 8l pdip cs8312yd8 8l so narrow cs8312ydr8 8l so narrow (tape & reel) 5 cs8312 thermal data 8l so 8l pdip r jc typ 45 52 c/w r ja typ 165 100 c/w package specification package dimensions in mm (inches) ordering information package thermal data rev. 8/16/99 d lead count metric english max min max min 8 lead so narrow 5.00 4.80 .197 .189 8 lead pdip 10.16 9.02 .400 .355 ? 1999 cherry semiconductor corporation cherry semiconductor corporation reserves the right to make changes to the specifications without notice. please contact cherry semiconductor corporation for the latest available information. surface mount narrow body (d); 150 mil wide plastic dip (n); 300 mil wide 0.39 (.015) min. 2.54 (.100) bsc 1.77 (.070) 1.14 (.045) d some 8 and 16 lead packages may have 1/2 lead at the end of the package. all specs are the same. .203 (.008) .356 (.014) ref: jedec ms-001 3.68 (.145) 2.92 (.115) 8.26 (.325) 7.62 (.300) 7.11 (.280) 6.10 (.240) .356 (.014) .558 (.022) 1.27 (.050) bsc 0.51 (.020) 0.33 (.013) 6.20 (.244) 5.80 (.228) 4.00 (.157) 3.80 (.150) 1.57 (.062) 1.37 (.054) d 0.25 (0.10) 0.10 (.004) 1.75 (.069) max 1.27 (.050) 0.40 (.016) ref: jedec ms-012 0.25 (.010) 0.19 (.008)
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