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july 2010 doc id 13304 rev 3 1/13 13 acst2 overvoltage protected ac switch features triac with overvoltage crowbar technology high noise immunity: static dv/dt > 500 v/s ACST210-8FP, in the to-220fpab package, provides insulation voltage rated at 1500 v rms benefits enables equipment to meet iec 61000-4-5 high off-state reliabilit y with planar technology needs no external overvoltage protection reduces component count interfaces directly with the micro-controller high immunity against fast transients described in iec 61000-4-4 standards applications ac on/off static switch ing in appliances and industrial control systems driving low power highl y inductive loads like solenoid, pump, fan, and micro-motor description the acst2 series belongs to the acs?/acst power switch family built with a.s.d. ? (application specific discrete) technology. this high performance device is suited to home appliances or industrial systems and drives loads up to 2 a. this acst2 switch embeds a triac structure with a high voltage clamping device to absorb the inductive turn-off energy and withstand line transients such as those described in the iec 61000-4-5 standards. the component needs a low gate current to be activated (i gt < 10 ma) and still shows a high electrical noise immunity complying with iec standards such as iec 61000-4-4 (fast transient burst test). figure 1. functional diagram tm : acs is a trademark of stmicroelectronics ?: a.s.d. is a registered trademark of stmicroelectronics table 1. device summary symbol value unit i t(rms) 2a v drm /v rrm 800 v i gt 10 ma com com out out g g to-220fpab ACST210-8FP dpak acst210-8b g com out www.st.com
characteristics acst2 2/13 doc id 13304 rev 3 1 characteristics table 2. absolute maximum ratings (limiting values) symbol parameter value unit i t(rms) on-state rms current (full sine wave) to-220fpab t c = 105 c 2 a dpak t c = 110 c i tsm non repetitive surge peak on-state current (full cycle sine wave, t j initial = 25 c) f = 60 hz t = 16.7 ms 8.4 a f = 50 hz t = 20 ms 8.0 i 2 ti 2 t value for fusing t p = 10 ms 0.5 a 2 s di/dt critical rate of rise of on-state current i g = 2 x i gt , t r = 100 ns f = 120 hz tj = 125 c 50 a/s v pp (1) non repetitive line peak mains voltage (1) tj = 25 c 2 kv p g(av) average gate power dissipation tj = 125 c 0.1 w p gm peak gate power dissipation (t p = 20 s) tj = 125 c 10 w i gm peak gate current (t p = 20 s) tj = 125 c 1.6 a t stg t j storage junction temperature range operating junction temperature range -40 to +150 -40 to +125 c t l maximum lead soldering temperature during 10 s (at 3 mm from plastic case) 260 c v ins(rms) insulation rms voltage t0-220fpab 1500 v 1. according to test described in iec 61000-4-5 standard and figure 18 table 3. electrical characteristics (t j = 25 c, unless otherwise specified) symbol test conditio ns quadrant value unit i gt (1) v out = 12 v, r l = 33 i - ii - iii max 10 ma v gt v out = 12 v, r l = 33 i - ii - iii max 1.1 v v gd v out = v drm , r l = 3.3 k , t j = 125 c i - ii - iii min 0.2 v i h (2) i out = 100 ma max 10 ma i l i g = 1.2 x i gt i - iii max 25 ma ii max 35 dv/dt (2) v out = 67% v drm gate open, t j = 125 c min 500 v/s (di/dt)c (2) (dv/dt)c = 15 v/s, t j = 125 c min 0.5 a/ms v cl i cl = 0.1 ma, t p = 1 ms, t j = 25 c min 850 v 1. minimum i gt is guaranteed at 5% of i gt max 2. for both polarities of ou t pin referenced to com pin
acst2 characteristics doc id 13304 rev 3 3/13 table 4. static electrical characteristics symbol test conditions value unit v tm (1) i tm = 2.8 a, t p = 500 s t j = 25 c max 2 v v to (1) threshold voltage t j = 125 c max 0.9 v r d (1) dynamic resistance t j = 125 c max 250 m i drm i rrm v out = v drm / v rrm t j = 25 c max 10 a t j = 125 c 0.5 ma 1. for both polarities of ou t pin referenced to com pin table 5. thermal resistances symbol parameter value unit r th(j-c) junction to case (ac) dpak 4.5 c/w to-220fpab 7 r th(j-a) junction to ambient to-220fpab 60 s cu (1) = 0.5 cm 2 dpak 70 1. s cu = copper surface under tab figure 2. maximum power dissipation versus on-state rms current (full cycle) figure 3. on-state rms current versus case temperature 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 p(w) =180 180 i t(rms) (a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 25 50 75 100 125 i t(rms) ( a ) =180 dpak to-220fpab t c (c)
characteristics acst2 4/13 doc id 13304 rev 3 figure 4. on-state rms current versus ambient temperature figure 5. relative variation of thermal impedance versus pulse duration to-220fpab 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 25 50 75 100 125 i t(rms) (a) =180 printed circuit board fr4 natural convection s cu =0.5 cm2 t amb (c) 0.01 0.10 1.00 1.0e-04 1.0e-03 1.0e-02 1.0e-01 1.0e+00 1.0e+01 1.0e+02 1.0e+03 k=[z th /r th ] z th(j-a) z th(j-c) to-220fpab t p (s) figure 6. relative variation of thermal impedance versus pulse duration dpak figure 7. relative variation of gate trigger, holding and latching current versus junction temperature 1.0e-02 1.0e-01 1.0e+00 1.0e-04 1.0e-03 1.0e-02 1.0e-01 1.0e+00 1.0e+01 1.0e+02 1.0e+03 k=[z th /r th ] z th(j-a) z th(j-c) dpak t p (s) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 i gt ,i h ,i l [t j ]/i gt ,i h ,i l [t j =25 c] i gt i l & i h t j (c) typical values figure 8. relative variation of static dv/dt versus junction temperature figure 9. relative variation of critical rate of decrease of main current versus reapplied dv/dt (typical values) 1 10 100 25 50 75 100 125 dv/dt [t j ]/dv/dt[t j =125 c] v out =540 v t j (c) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0.1 1.0 10.0 100.0 (di/dt) c [(dv/dt) c ] / specified (di/dt) c v out =300 v (dv/dt) c (v/s)
acst2 characteristics doc id 13304 rev 3 5/13 figure 10. relative variation of critical rate of decrease of main current versus junction temperature figure 11. surge peak on-state current versus number of cycles 0 2 4 6 8 10 12 14 16 18 20 25 50 75 100 125 (di/dt) c [t j ]/(di/dt) c [t j =125 c] v out =300 v t j (c) 0 1 2 3 4 5 6 7 8 9 1 10 100 1000 i tsm (a) non repetitive t j initial=25 c repetitive t c =110 c one cycle t=20ms number of cycles figure 12. non repetitive surge peak on-state current and corresponding value of i 2 t figure 13. on-state characteristics (maximum values) 0.1 1.0 10.0 100.0 0.01 0.10 1.00 10.00 i tsm (a), i2t (a2s) t j initial=25 c i tsm i2t t p (ms) sinusoidal pulse with width t < 10 ms p 1.e-02 1.e-01 1.e+00 1.e+01 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 i tm (a) t j max. : v to = 0.90 v r d = 250 mw t j =25 c t j =125 c v tm (v) figure 14. thermal resistance junction to ambient versus copper surface under tab dpak figure 15. relative variation of clamping voltage v cl versus junction temperature 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 r th(j-a) (c/w) dpak s cu (cm2) printed circuit board fr4, copper thickness = 35 m 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 -40 -20 0 20 40 60 80 100 120 140 v cl [t j ]/v cl [t j =25 c] t j (c)
application information acst2 6/13 doc id 13304 rev 3 2 application information 2.1 typical application description the acst2 device has been designed to switch on and off highly inductive or resistive loads such as pump, valve, fan, or bulb la mp. thanks to its high sensitivity (i gt max = 10 ma), the acst2 can be driven directly by logic level circuits through a resistor as shown on the typical application diagram. thanks to its thermal and turn-off commutation performances, the acst2 switch can drive, without any additional snubber, an inductive load up to 2 a. figure 16. ac induction motor control ? typical diagram ac load mcu line power supply l ac mains r rg acst2
acst2 application information doc id 13304 rev 3 7/13 2.2 ac line transient voltage ruggedness in comparison with standard triacs, which are not robust against surge voltage, the acst2 is self-protected against over-voltage, specified by the new parameter v cl . in addition, the acst2 is a sensitive device (i gt = 10 ma), but provides a high noise immunity level againast fast transients. the acst2 switch can safely withstand ac line transient voltages either by clamping the low energy spikes, such as inductive spikes at switch off, or by switching to the on state (for less than 10 ms) to dissipate higher energy shocks through the load. this safety feature works even with high turn-on current ramp up. the test circuit of figure 17 represents the acst2 application, and is used to stress the acst switch according to the iec 61000-4-5 standard conditions. with the additional effect of the load which is limiting th e current, the acst switch withstands the voltage spikes up to 2 kv on top of the peak line voltage. the protection is based on an overvoltage crowbar technology. the acst2 folds back safely to the on state as shown in figure 18 . the acst2 recovers its blocking voltage capability after the su rge and the next zero current crossing. such a non repetitive test can be done at least 10 times on each ac line voltage polarity. figure 17. overvoltage ruggedness test circuit for resistive and inductive loads for iec 61000-4-5 standards a c mains r filtering unit rg model of the load rgene surge generator acst210-8x 2kv surge l r = 20 , l = 10 h, v pp = 2 kv
application information acst2 8/13 doc id 13304 rev 3 figure 18. typical current and voltage waveforms across the acst2 during iec 61000-4-5 standard test 2.3 electrical noise immunity the acst2 is a sensitive device (i gt = 10 ma) and can be controlled directly though a simple resistor by a logic level circuit, and still provides a high electrical noise immunity. the intrinsic immunity of the acst2 is shown by th e specified dv/dt equal to 500 v/s @ 125 c. this immunity level is 5 to 10 times higher than the immunity provided by an equivalent standard technology triac with the same sensitivity. in other words, the acst2 is sensitive, but has an immunity usually available only for non-sensitive device (i gt higher than 35 ma). i v 0 0 v peak =v cl 1.2/50 s voltage surge 8/20 s current surge
acst2 ordering information scheme doc id 13304 rev 3 9/13 3 ordering information scheme figure 19. ordering information scheme acs t 2 10 - 8 b tr ac switch topology on-state rms current sensitivity voltage package delivery mode t = triac 2 = 2 a 10 = 10 ma 8 = 800 v fp = to-220fpab b = dpak tr = tape and reel (dpak) blank = tube (to-220fpab, dpak)
package information acst2 10/13 doc id 13304 rev 3 4 package information epoxy meets ul94, v0 recommended torque (to-220fpab): 0.4 to 0.6 nm in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. table 6. to-220fpab dimensions ref. dimensions millimeters inches min. max. min. max. a 4.4 4.6 0.173 0.181 b 2.5 2.7 0.098 0.106 d 2.5 2.75 0.098 0.108 e 0.45 0.70 0.018 0.027 f 0.75 1 0.030 0.039 f1 1.15 1.70 0.045 0.067 f2 1.15 1.70 0.045 0.067 g 4.95 5.20 0.195 0.205 g1 2.4 2.7 0.094 0.106 h 10 10.4 0.393 0.409 l2 16 typ. 0.63 typ. l3 28.6 30.6 1.126 1.205 l4 9.8 10.6 0.386 0.417 l5 2.9 3.6 0.114 0.142 l6 15.9 16.4 0.626 0.646 l7 9.00 9.30 0.354 0.366 dia. 3.00 3.20 0.118 0.126 h a b dia l7 l6 l5 f1 f2 f d e l4 g1 g l2 l3
acst2 package information doc id 13304 rev 3 11/13 figure 20. footprint (dimensions in mm) table 7. dpak dimensions ref. dimensions millimeters inches min. max. min. max. a 2.20 2.40 0.086 0.094 a1 0.90 1.10 0.035 0.043 a2 0.03 0.23 0.001 0.009 b 0.64 0.90 0.025 0.035 b2 5.20 5.40 0.204 0.212 c 0.45 0.60 0.017 0.023 c2 0.48 0.60 0.018 0.023 d 6.00 6.20 0.236 0.244 e 6.40 6.60 0.251 0.259 g 4.40 4.60 0.173 0.181 h 9.35 10.10 0.368 0.397 l2 0.80 typ. 0.031 typ. l4 0.60 1.00 0.023 0.039 v2 0 8 0 8 h l4 g b l2 e b2 d a1 r r c a c2 0.60 min. v2 a2 6.7 6.7 3 3 1.6 1.6 2.3 2.3
ordering information acst2 12/13 doc id 13304 rev 3 5 ordering information 6 revision history table 8. ordering information order code marking package weight base qty packing mode ACST210-8FP acst2108 to-220fpab 2.4g 50 tube acst210-8b dpak 0.3g 50 tube acst210-8b-tr dpak 0.3g 2500 tape and reel table 9. document revision history date revision changes 01-mar-2007 1 initial release. 13-apr-2010 2 updated ecopack statement. refo rmatted for consistency with other datasheets in this product class. 01-jul-2010 3 updated figure 19.
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