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february 2011 doc id 7463 rev 9 1/13 13 acst8 overvoltage protected ac switch features triac with overvoltage protection high noise immunity: static dv/dt > 2000 v/s to-220fpab insulated package: 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 the power passi ve component count high immunity against fast transients described in iec 61000-4-4 standards applications ac mains static switching in appliance and industrial control systems drive of medium power ac loads such as: ? universal motor of washing machine drum ? compressor for fridge or air conditioner description the acst8 series belongs to the acs?/ acst power switch family built around a.s.d. ? (application specific discrete) technology. this high performance device is suited to home appliances or industrial systems and drives an induction motor up to 8 a. this acst8 device 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. acst8 shows a high 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) 8a v drm /v rrm 800 v i gt 30 ma to-220ab acst830-8t to-220fpab ACST830-8FP d 2 pak acst830-8g com out out g com out g g out com g com out www.st.com
characteristics acst8 2/13 doc id 7463 rev 9 1 characteristics table 2. absolute ratings (limiting values) symbol parameter value unit i t(rms) on-state rms current (full sine wave) to-220fpab t case = 91 c 8a to-220ab / d 2 pa k t case = 105 c d 2 pak with 1cm2 cu t amb = 43 c 2 a i tsm non repetitive surge peak on-state current t j initial = 25 c, full cycle sine wave f = 50 hz t p = 20 ms 80 a f = 60 hz t p = 16.7 ms 84 a i 2 t thermal constraint for fuse selection t p = 10 ms 42 a 2 s di/dt critical rate of rise on-state current i g = 2 x i gt, (t r 100 ns) f = 120 hz t j = 125 c 100 a/s v pp (1) non repetitive line peak pulse voltage t j = 25 c 2 kv p g(av) average gate power dissipation t j = 125 c 0.1 w p gm peak gate power dissipation (t p = 20 ms) t j = 125 c 10 w i gm peak gate current (t p = 20 ms) t j = 125 c 1.6 a t stg storage temperature range - 40 to + 150 c t j operating junction temperature range - 40 to + 125 c t l maximum lead soldering temperature during 10 s 260 c v ins(rms) insulation rms voltage to-220fpab 1500 v 1. according to test described in iec 61000-4-5 standard and figure 18. table 3. electrical characteristics per switch symbol test conditions quadrant t j value unit i gt (1) v out = 12 v, r l = 33 i - ii - iii 25 c max 30 ma v gt v out = 12v, r l = 33 i - ii - iii 25 c max 1.0 v v gd v out = v drm , r l = 3.3 k i - ii - iii 125 c min 0.2 v i h (2) i out = 500 ma 25 c max 30 ma i l i g = 1.2 x i gt i - ii - iii 25 c max 50 ma dv/dt (2) v out = 67% v drm , gate open 125 c min 2000 v/s (di/dt)c (2) without snubber 125 c min 8 a/ms v cl i cl = 0.1 ma, t p = 1 ms 25 c min 850 v 1. minimum i gt is guaranteed at 5% of i gt(max) 2. for either positive or negative polarity of out pin with reference to com pin
acst8 characteristics doc id 7463 rev 9 3/13 table 4. static characteristics symbol test conditions value unit v tm i tm = 11.3 a t p = 500 s tj = 25 c max 1.5 v v to threshold voltage tj = 125 c max 0.9 v r d dynamic resistance tj = 125 c max 50 m i drm i rrm v out = v drm / v rrm tj = 25 c max 20 a tj = 125 c 1 ma table 5. thermal resistances symbol parameter value unit r th(j-a) junction to ambient to-220fpab to-220ab 60 c/w junction to ambient (soldered on 1 cm 2 copper pad) d 2 pa k 4 5 r th(j-c) junction to case (ac) to-220fpab 3.6 to-220ab, d 2 pa k 2 figure 2. maximum power dissipation versus on-state rms current figure 3. on-state rms current versus case temperature (full cycle) p(w) 0 1 2 3 4 5 6 7 8 9 10 012345678 =180 180 i (a) t(rms) i (a) t(rms) 0 1 2 3 4 5 6 7 8 9 0 25 50 75 100 125 =180 to-220fpab 220ab d 2 pac k to - t (c) c
characteristics acst8 4/13 doc id 7463 rev 9 figure 4. on-state rms current versus ambient temperature (free air convection, fulle cycle) figure 5. relative variation of thermal impedance versus pulse duration i (a) t(rms) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 25 50 75 100 125 =180 to-220 d 2 pa k copper surface = 1cm 2 t (c) amb k=[z /r ] th th 1.0e-02 1.0e-01 1.0e+00 1.0e-03 1.0e-02 1.0e-01 1.0e+00 1.0e+01 1.0e+02 1.0e+03 z th(j-a) to-220ab to-220fpab to-220ab to-220fpab z th(j-c) t (s) p figure 6. relative variation of gate trigger current (i gt ) and voltage (v gt ) versus junction temperature figure 7. relative variation of holding current (i h ) and latching current (i l ) versus junction temperature 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -50 -25 0 25 50 75 100 125 i gt ,v gt [t j ]/i gt ,v gt [t j =25 c] i gt q1-q2 v gt q1-q2-q3 i gt q3 t j (c) typical values 0.0 0.5 1.0 1.5 2.0 2.5 -50 -25 0 25 50 75 100 125 i h ,i l [t j ]/i h ,i l [t j =25 c] i h i l t j (c) figure 8. surge peak on-state current versus number of cycles figure 9. non repetitive surge peak on-state current and corresponding value of i 2 t versus sinusoidal pulse width 0 10 20 30 40 50 60 70 80 90 1 10 100 1000 i tsm (a) non repetitive t j initial=25 c one cycle t=20ms repetitive t c =105 c number of cycles 1 10 100 1000 0.01 0.10 1.00 10.00 i tsm (a), i2t (a2s) t j initial=25 c di/dt limitation: 100 a/s i tsm i2t t p (ms) sinusoidal pulse with width t < 10 ms p
acst8 characteristics doc id 7463 rev 9 5/13 figure 10. on-state characteristics (maximum values) figure 11. relative variation of critical rate of decrease of main current (di/dt) c versus junction temperature 1 10 100 012345 i tm (a) t j =25 c t j =125 c t j max : v to = 0.90 v r d = 50 m v tm (v) (di/dt)c[t ] / j (di/dt)c[t =125c] j 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 25 50 75 100 125 t j (c) figure 12. relative variation of static dv/dt immunity versus junction temperature (gate open) figure 13. relative variation of leakage current versus junction temperature dv/dt[t ] / j dv/dt[t =125c] j 0 1 2 3 4 5 6 7 8 9 10 11 25 50 75 100 125 v d =v r =530 v t j (c) i drm /i rrm [tj;v drm/ v rrm ]/i drm /i rrm [tj=125c; 8 00v] 1.0e-03 1.0e-02 1.0e-01 1.0e+00 25 50 75 100 125 v drm =v rrm =800 v v drm =v rrm =800 v v drm =v rrm =600 v v drm =v rrm =200 v t j (c) different blocking voltages figure 14. relative variation of clamping voltage (v cl ) versus junction temperature (minimum values) figure 15. thermal resistance junction to ambient versus copper surface under tab v cl [tjj/v cl [tj=25c ] 0.85 0.90 0.95 1.00 1.05 1.10 1.15 -50 -25 0 25 50 75 100 125 t j (c) 0 10 20 30 40 50 60 70 80 0 5 10 15 20 25 30 35 40 r th(j-a) (c/w) d2pak s cu (cm2) printed circuit board fr4, copper thickness = 35 m
application information acst8 6/13 doc id 7463 rev 9 2 application information 2.1 typical application description the acst8 device has been designed to control medium power load, such as ac motors in home appliances. thanks to its thermal and turn off commutation performances, the acst8 switch is able to drive an inductive load up to 8 a with no turn off additional snubber. it also provides high thermal performances in static and transient modes such as high torque operating conditions or inrush current of an ac motor. figure 16. ac induction motor control ? typical diagram selection of the rotor direction ac induction motor phase shift capacitor + protective air inductance acst mcu ac motor rg c ac mains vcc rg acst l
acst8 application information doc id 7463 rev 9 7/13 2.2 ac line transient voltage ruggedness in comparison with standard triacs, which are not robust against surge voltage, the acst8 is self-protected against over-voltage, specified by the new parameter v cl . the acst8 switch can safely withs tand 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 acst8 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 acst8 folds back safely to the on state as shown in figure 18 . the acst8 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 ac mains r filtering unit rg model of the load rgene surge generator acst8 2kv surge l r = 13 , l = 2 h, vsurge = 2 kv rg = 82
ordering information scheme acst8 8/13 doc id 7463 rev 9 figure 18. typical current and voltage waveforms across the acst8 during iec 61000-4-5 standard test 3 ordering information scheme figure 19. ordering information scheme i v 0 0 v peak =v cl 1.2/50 s voltage surge 8/20 s current surge i peak = 160 a di/dt = 180 a/s acs t 8 30 - 8 g tr ac switch topology on-state rms current repetitive peak off-state voltage package delivery mode t = triac 8 = 8 a 8 = 800 v fp = to-220fpab t = to-220ab g = d 2 pa k tr = tape and reel blank = tube triggering gate current 30 = 30 ma
acst8 package information doc id 7463 rev 9 9/13 4 package information epoxy meets ul94, v0 recommended torque: 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-220ab dimensions ref. dimensions millimeters inches min. max. min. max. a 4.40 4.60 0.173 0.181 c 1.23 1.32 0.048 0.051 d 2.40 2.72 0.094 0.107 e 0.49 0.70 0.019 0.027 f 0.61 0.88 0.024 0.034 f1 1.14 1.70 0.044 0.066 f2 1.14 1.70 0.044 0.066 g 4.95 5.15 0.194 0.202 g1 2.40 2.70 0.094 0.106 h2 10 10.40 0.393 0.409 l2 16.4 typ. 0.645 typ. l4 13 14 0.511 0.551 l5 2.65 2.95 0.104 0.116 l6 15.25 15.75 0.600 0.620 l7 6.20 6.60 0.244 0.259 l9 3.50 3.93 0.137 0.154 m 2.6 typ. 0.102 typ. diam. 3.75 3.85 0.147 0.151 a c d l7 dia l5 l6 l9 l4 f h2 g g1 l2 f2 f1 e m
package information acst8 10/13 doc id 7463 rev 9 table 7. 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 diam. 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
acst8 package information doc id 7463 rev 9 11/13 figure 20. footprint (dimensions in mm) table 8. d 2 pak dimensions ref. dimensions millimeters inches min. max. min. max. a 4.40 4.60 0.173 0.181 a1 2.49 2.69 0.098 0.106 a2 0.03 0.23 0.001 0.009 b 0.70 0.93 0.027 0.037 b2 1.14 1.70 0.045 0.067 c 0.45 0.60 0.017 0.024 c2 1.23 1.36 0.048 0.054 d 8.95 9.35 0.352 0.368 e 10.00 10.40 0.393 0.409 g 4.88 5.28 0.192 0.208 l 15.00 15.85 0.590 0.624 l2 1.27 1.40 0.050 0.055 l3 1.40 1.75 0.055 0.069 m 2.40 3.20 0.094 0.126 r 0.40 typ. 0.016 typ. v2 0 8 0 8 g l l3 l2 b b2 e * flat zone no less than 2mm a c2 d r a2 m v2 c a1 * 16.90 10.30 8.90 3.70 5.08 1.30
ordering information acst8 12/13 doc id 7463 rev 9 5 ordering information 6 revision history table 9. ordering information order code marking package weight base qty packing mode ACST830-8FP acst8308 to-220fpab 2.4 g 50 tube acst830-8t to-220ab 2.3 g 50 tube acst830-8gtr d 2 pak 1.5 g 500 tape and reel table 10. document revision history date revision changes jan-2002 4b last update. 08-nov-2004 5 to-220ab and d 2 pak packages added. 24-nov-2004 6 table 6 page 3: i gt parameter added 18-dec-2009 7 added ecopack statement. reformat ted for consistency with other datasheets in this product class. order codes updated. 01-jul-2010 8 updated figure 19. 07-feb-2011 9 updated table 2.
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