1 features device driver gnd sense v cc osc ign enable series regulator vsup lamp vreg lamp indicator osc vhv + e rs flop set dominate s r q r enable stator power up stator timer vsup load dump detection and protection note: cs-3341/cs-387 disconnected cs-3351/cs-386 connected + e delay sc stator + e vsup n drives npn darlington n short circuit protection n 80v load dump n temperature compensated regulation voltage n shorted field protection duty cycle, self clearing package options cs-3341/3351/386/387 alternator voltage regulator darlington driver cs-3341/51 cs-386/387 description the cs-3341/3351/386/387 integral alternator regulator integrated cir- cuit provides the voltage regulation for automotive, 3-phase alternators. it drives an external power darlington for control of the alter- nator field current. in the event of a charge fault, a lamp output pin is provided to drive an external dar- lington transistor capable of switch- ing on a fault indicator lamp. an overvoltage or no stator signal condition activates the lamp output. the cs-3341 and cs-3351 are avail- able in so14 packages. the cs-386 and cs-387 are available as flip chips. block diagram absolute maximum ratings storage .....................................................................................-55?c to +165?c operating cs-3341/51 .........................................................................-40?c to +125?c cs-386/387 .........................................................................-40?c to +150?c junction ........................................................................................................150?c continuous supply..........................................................................................27v i cc load dump .........................................................................................400 ma lead temperature soldering reflow (smd styles only)............60 sec. max above 183?c, 230?c peak 1 dd gnd nc osc lamp nc nc sc nc v cc sense ign stator nc 14 lead so cherry semiconductor corporation 2000 south county trail east greenwich, rhode island 02818-1530 tel: (401)885-3600 fax (401)885-5786 email: info@cherry-semi.com flip chip cs-3341/51 cs-386/387 a company
2 electrical characteristics: -40 ? c < t j < 150 ? c, 9v 2 v cc 2 17v unless otherwise specified parameter test conditions min typ max unit cs-3341/3351/386/387 n supply supply current enabled e 12 25 ma supply current disabled e 50 a n driver stage device driver e e e output high current v dd = 1.2v -10 -6 -4 ma output low voltage i ol = 25 a e 0.35 v minimum on time 200 s minimum duty cycle e 6 10 % field switch turn on rise time 30 90 s fall time 30 90 s n stator input high voltage 10 v input low voltage e 6 v stator time out high to low 6 100 600 ms stator power-up input high cs-3351/386 only 10 e v stator power-up input low cs-3351/386 only e 6 v n lamp output high current v lamp @ 3v e 50 a output low voltage i lamp @ 30ma e 0.35 v lamp drive-dynamic rise time r l = 600, c l = 100pf e 1 s fall time r l = 600, c l = 100pf e 1 s n ignition input high voltage i cc > 1ma 1.8 e v input low voltage i cc < 100 a e 0.5 v n oscillator oscillator frequency c osc = 0.22 f 65 325 hz rise time/fall time c osc = 0.22 f 17 e e oscillator high threshold c osc = 0.22 f e 6 v n battery sense input current -10 +10 a regulation voltage @25 ? c, r 1 = 100k ? , r 2 = 50k ? 13.5 15.5 v proportional control 0.050 0.400 v high voltage v high voltage @ lamp on 1.083 1.190 threshold ratio v regulation @ 50% duty cycle high voltage hysteresis 0.020 0.600 v
3 cs-3341/3351/386/387 package pin description package pin # pin symbol function application information the cs-3341 and cs-3351 ic's are designed for use in an alternator charging system. the circuit is also available in flip-chip form as the cs-387 and cs-386. in a standard alternator design (figure 1), the rotor carries the field winding. an alternator rotor usually has several n and s poles. the magnetic field for the rotor is produced by forcing current through a field or rotor winding. the stator windings are formed into a number of coils spaced around a cylindrical core. the number of coils equals the number of pairs of n and s poles on the rotor. the alternating cur - rent in the stator windings is rectified by the diodes and applied to the regulator. by controlling the amount of field current, the magnetic field strength is controlled and hence the output voltage of the alternator. referring to figure 2, a typical application diagram, the oscillator frequency is set by an external capacitor connect - ed between osc and ground. the sawtooth waveform ramps between 1v and 3v and provides the timing for the system. for the circuit shown the oscillator frequency is approximately 140hz. the alternator voltage is sensed at terminal a via the resistor divider network r1/r2 on the sense pin of the ic. the voltage at the sense pin determines the duty cycle for the regulator. the voltage is adjusted by potentiometer r2. a relatively low voltage on the sense pin causes a long duty cycle that increases the field cur - rent. a high voltage results in a short duty cycle. the ignition terminal (i) switches power to the ic through the v cc pin. in the cs-3351/cs-386, the stator pin senses the voltage from the stator. this will keep the device pow - ered while the voltage is high, and it also senses a stopped engine condition and drives the lamp pin high after the stator timeout expires. the lamp pin also goes high when an overvoltage condition is detected on the sense pin. this causes the darlington lamp drive transistor to switch on and pull current through the lamp. if the system voltage continues to increase, the field and lamp output turn off as in an overvoltage or load dump condition. the sc or short circuit pin monitors the field voltage. if the drive output and the sc voltage are simultaneously high for a predetermined period, a short circuit condition is assumed and the output is disabled. the regulator is forced to a minimum short circuit duty cycle. 14l so flip chip 1 1 driver output driver for external power switch-darlington 2 2 gnd ground 3, 6, 7, 9, 13 3 nc no connection 4 4 osc timing capacitor for oscillator 5 5 lamp base driver for lamp driver indicates no stator signal or over - voltage condition 8 6 ign switched ignition power up 10 7 stator stator signal input for stator timer (cs-3351 also power up) 11 8 sense battery sense voltage regulator comparator input and protec - tion 12 9 v cc supply for ic 14 10 sc short circuit sensing ba tter y lamp indicator ignition switch regulator i gnd field a s field winding st a t or winding figure 1. iar system block diagram
4 cs-3341/51/386/387 application information: continued r2 10k w sc driver gnd st a t or sense v cc osc ign 20k w c4 0.022 m f 50k w c3 .047 m f 100k w 250 w c1 0.1 m f 18k w ba tter y lamp 2.4k w 10 w power darlington lamp indicator ignition switch power ground power darlington field r5 r4 r3 r1 r6 r9 r7 r10 510 w st a t or rectifier a f i s d1 q1 c2 10 m f figure 2. typical application diagram
5 cs-3341/3351/386/387 package specification thermal data 14l so r q jc typ 30 ?c/w r q ja typ 125 ?c/w d lead count metric english max min max min 14l so 8.74 8.53 .344 .336 package dimensions in mm (inches) package thermal data 1.27 (.050) 0.48 (.019) 0.35 (.014) 6.20 (.244) 5.80 (.228) 4.01 (.158) 3.80 (.150) 1.75 (.069) 1.35 (.053) 0.25 (.010) 0.10 (.004) 0.89 (.035) 0.41 (.016) d so narrow
6 cs-3341/3351/386/387 11/7/95 ordering information part number description CS-3341YD14 14l so cs-3351yd14 14l so cs-386 flip chip cs-387 flip chip package specification: continued solder bump locations, bump side up ign dd sc cs-386/387 flip chip 1.96mm 506 m m 510 m m 488 m m 506 m m 594 m m 506 m m lamp osc nc gnd 742 m m 762 m m v cc sense stator 1000 m m 605 m m 2.07mm flip chip ? 1997 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.
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