ACST12. Overvoltage protected AC switch. Features. Applications. Description. Benefits

Size: px

Start display at page:

Download "ACST12. Overvoltage protected AC switch. Features. Applications. Description. Benefits"

Letitia Harris
5 years ago
Views:

1 ACST2 Overvoltage protected AC switch Features Triac with overvoltage crowbar technology Low I GT (< ma) or high immunity (I GT <35 ma) version High noise immunity: static dv/dt > 2 V/µs Benefits Enables equipment to meet IEC High off-state reliability with planar technology Need no external over voltage protection Reduces the power passive component count High immunity against fast transients described in IEC standards OUT Figure. TO-22AB ACST2-7T ACST235-7T G OUT COM Functional diagram OUT OUT COM G D 2 PAK ACST2-7G ACST235-7G 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 G COM 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 and a high voltage clamping device able to absorb the inductive turn-off energy and withstand line transients such as those described in the IEC standard. The ACST2-7 needs a low gate current to be activated (I GT < ma) and still provides a high electrical noise immunity complying with the IEC standard. The ACST235-7 offers an extremely high static dv/dt immunity of 2 kv/µs minimum. Table. Device summary Symbol Value Unit I T(RMS) 2 A V DRM /V RRM 7 V I GT or 35 ma TM: ACS is a trademark of STMicroelectronics : A.S.D. is a registered trademark of STMicroelectronics December 2 Doc ID 5238 Rev 4 /3 3

2 Characteristics ACST2 Characteristics Table 2. Absolute ratings (limiting values) Symbol Parameter Value Unit I T(RMS) I TSM On-state rms current full sine wave Non repetitive surge peak on-state current T j initial = 25 C,( full cycle sine wave) TO-22AB D 2 PAK D 2 PAK with cm 2 of Cu T c = 4 C 2 T amb = 47 C F = 6 Hz t p = 6.7 ms 26 A F = 5 Hz t p = 2. ms 2 A I 2 t I 2 t for fuse selection t p = ms 95 A 2 s di/dt Critical rate of rise on-state current I G = 2 x I GT, (t r ns) F = 2 Hz T j = 25 C A/µs V PP Non repetitive line peak pulse voltage () T j = 25 C 2 kv P G(AV) Average gate power dissipation T j = 25 C. W P GM Peak gate power dissipation (t p = 2 µs) T j = 25 C W I GM Peak gate current (t p = 2 µs) T j = 25 C.6 A T stg Storage temperature range - 4 to + 5 C T j Operating junction temperature range - 4 to + 25 C T l maximum lead soldering temperature during s (at 3 mm from plastic case) 26 C. According to test described in IEC standard and Figure 9 Table 3. Electrical characteristics Value Unit Symbol Test conditions Quadrant T j ACST2-7 ACST235-7 Unit I GT () V OUT = 2 V, R L = 33 Ω I - II - III 25 C MAX. 35 ma V GT V OUT = 2 V, R L = 33 Ω I - II - III 25 C MAX.. V V GD V OUT = V DRM, R L = 3.3 Ω I - II - III 25 C MIN..2 V I H (2) I OUT = 5 ma 25 C MAX. 3 5 ma I L I G =.2 x I GT I - II - III 25 C MAX. 5 7 ma dv/dt (2) V OUT = 67% V DRM, gate open 25 C MIN. 2 2 V/µs (dv/dt)c = 5 V/µs MIN. 5.3 (di/dt)c (2) 25 C A/ms Without snubber MIN. 4 V CL I CL =. ma, t p = ms 25 C MIN. 85 V. Minimum I GT is guaranteed at 5% of I GT max 2. For both polarities of OUT pin referenced to COM pin 2 A 2/3 Doc ID 5238 Rev 4

3 ACST2 Characteristics Table 4. Static characteristics Symbol Test conditions Value Unit V () TM I OUT = 7 A, t p = 5 µs T j = 25 C MAX..5 V () V T Threshold voltage T j = 25 C MAX..9 V () R d Dynamic resistance T j = 25 C MAX. 3 mω I T DRM j = 25 C 2 µa V I OUT = V DRM / V RRM MAX. RRM T j = 25 C.5 ma. For both polarities of OUT pin referenced to COM pin Table 5. Thermal characteristics Symbol Parameter Value Unit R th(j-c) R th(j-a) Junction to case (AC) Junction to ambient TO-22AB C/W.5 D 2 PAK C/W TO-22AB 6 C/W D 2 PAK with cm 2 of Cu 45 C/W Figure 2. P(W) 5 4 α= Maximum power dissipation versus on-state rms current (full cycle) I T(RMS) (A) Figure I T(RMS) (A) On-state rms current versus case temperature (full cycle) T C ( C) Figure 4. IT(RMS)(A) On-state rms current versus ambient temperature (free air convection full cycle) D 2 PAK With cm 2 of cu Figure 5..E+ K=[Zth/Rth] Relative variation of thermal impedance versus pulse duration Z th(j-c) Z th(j-a) 2..5 TO-22AB.E-..5 Tamb( C) E-2 tp(s).e-3.e-2.e-.e+.e+.e+2.e+3 Doc ID 5238 Rev 4 3/3

4 Characteristics ACST2 Figure 6. I TM (A) On-state characteristics (maximum values) T j max : T j =25 C T j =25 C V to =.9 V VTM (V) R d = 3 mω Figure I (A), I t (A s) TSM Non repetitive surge peak on-state current for a sinusoidal pulse and corresponding value of I 2 t di/dt limitation: A/µs T j initial=25 C Figure I TSM (A) Repetitive T C =4 C Non repetitive surge peak on-state current versus number of cycles (T j initial = 25 C) Non repetitive T j initial=25 C t=2ms Number of cycles One cycle Figure I GT, V GT[T j] / I GT, V GT[T j = 25 C] Relative variation of gate triggering current and gate voltage versus junction temperature (typical value) 2.5 I GT Q3 I TSM 2. I GT Q-Q2.5 I²t. V GT Q-Q2-Q3.5 t P (ms)..... Tj( C) Figure. Relative variation of holding current (I H ) and latching current (I L ) versus junction temperature Figure. Relative variation of critical rate of decrease of main current (di/dt)c versus (dv/dt)c 2.5 I,I [T]/I, I [T = 25 C] H L j H L j (di/dt)c[(dv/dt)c] / Specified(di/dt)c Typical values.2..8 ACST2-7Cxx..6 ACST2-7Sxx I L I H T j ( C).4.2 (dv/dt)c (V/µs).. 4/3 Doc ID 5238 Rev 4

5 ACST2 Characteristics Figure 2. Relative variation of critical rate of decrease of main current versus junction temperature Figure 3. Relative variation of static dv/dt immunity versus junction temperature (di/dt)c[tj] / (di/dt)c[tj=25 C] 2 dv/dt[tj] / dv/dt[tj=25 C] V D =V R =469 V Tj( C) Tj( C) Figure V CL[T J/V CL[T J = 25 C] Relative variation of maximum clamping voltage, V CL versus junction temperature Figure 5. R th(j-a) ( C/W) Variation of thermal resistance junction to ambient versus copper surface under tab Epoxy printed circuit board FR4, copper thickness = 35 µm D²PAK Minimum values T J( C) S CU(cm²) Doc ID 5238 Rev 4 5/3

6 Application information ACST2 2 Application information 2. Typical application description The ACST2 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 ACST2 switch is able to drive an inductive load up to 2 A with no turn off additional snubber. It also provides high thermal performances in static and transient modes such as the compressor inrush current or high torque operating conditions of an AC motor. Thanks to its low gate triggering current level, the ACST2-7 can be driven directly by a MCU through a simple gate resistor as shown in Figure 6. Figure 6. Compressor control typical diagrams Compressor Compressor AC Mains PTC AC Mains ACST 2 Electronic starter PTC ACST 3 Electronic thermostat logical circuitry Run switch ACST ACST Start switch Rg Rg Rg Power supply Gate Driver Power supply Gate Driver Compressor with integrated e-starter Compressor with external electronic drive 6/3 Doc ID 5238 Rev 4

7 ACST2 Application information Figure 7. Universal drum motor control typical diagram Universal motor Stator Rotor 2V AC Mains Motor direction setting MCU Speed motor regulation ACST Rg Vcc MCU 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. The ACST2 switch can safely withstand AC line transient voltages either by clamping the low energy spikes, such as the inductive spikes at switch off, or by switching to the on state (for less than 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 8 represents the ACST2 application, and is used to stress the ACST switch according to the IEC standard conditions. With the additional effect of the load which is limiting the 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 9. The ACST2 recovers its blocking voltage capability after the surge and the next zero crossing current. Such a non repetitive test can be done at least times on each AC line voltage polarity. Doc ID 5238 Rev 4 7/3

8 Application information ACST2 Figure 8. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC standards R = 2 Ω, L = 2 µh, Vsurge = 2 kv Surge generator 2kV surge Rgene Filtering unit Model of the load R L AC Mains ACST2 Rg Figure 9. Typical voltage and current waveforms across the ACST2 during IEC standard test V peak =V CL.2/5 µs voltage surge V I 8/2 µs current surge 8/3 Doc ID 5238 Rev 4

9 ACST2 Ordering information scheme 3 Ordering information scheme Figure 2. Ordering information scheme ACS T 2-7 G TR AC switch Topology T = Triac On-state rms current 2 = 2 A Sensitivity = ma 35 = 35 ma Voltage 7 = 7 V Package G = D²PAK T = TO-22AB Delivery mode TR = Tape and reel (DPAK) Blank = Tube (TO-22FPAB, DPAK) Doc ID 5238 Rev 4 9/3

10 Package information ACST2 4 Package information Epoxy meets UL94, V Recommended torque (TO-22AB):.4 to.6 N m 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: ECOPACK is an ST trademark. Table 6. TO-22AB dimensions Ref. Millimeters Dimensions Inches Min. Max. Min. Max. A H2 Dia L5 C A L7 C D E F L2 F2 L6 F F G F L9 D G F L4 H L2 6.4 typ..645 typ. G G M E L L L L L M 2.6 typ..2 typ. Diam /3 Doc ID 5238 Rev 4

11 ACST2 Package information Table 7. D 2 PAK dimensions Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A L2 E C2 A A A B L D B L3 B2 B A C R C C D G E mm min. FLAT ZONE A2 G L V2 L L R.4.6 V2 8 8 Figure 2. Footprint (dimensions in mm) Doc ID 5238 Rev 4 /3

12 Ordering information ACST2 5 Ordering information Table 8. Ordering information Order code Marking Package Weight Base qty Packing mode ACST2-7T TO-22AB 2.3 g 5 Tube ACST2-7G ACST27 D 2 PAK.5 g 5 Tube ACST2-7GTR D 2 PAK.5 g Tape and reel ACST235-7T TO-22AB 2.3 g 5 Tube ACST235-7G ACST2357 D 2 PAK.5 g 5 Tube ACST235-7GTR D 2 PAK.5 g Tape and reel 6 Revision history Table 9. Document revision history Date Revision Changes 2-Dec-28 First issue. 3-Apr-2 2 -Jul-2 3 Updated Figure 2. 7-Dec-2 4 Updated Table 3. Updated ECOPACK statement. Reformatted for consistency with other datasheets in this product class. 2/3 Doc ID 5238 Rev 4

13 ACST2 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. 2 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America Doc ID 5238 Rev 4 3/3

ACST10. Overvoltage protected AC switch. Features. Applications. Description. Benefits

ACST10. Overvoltage protected AC switch. Features. Applications. Description. Benefits Overvoltage protected AC switch Features Triac with overvoltage crowbar technology Low I GT (< ma) or high immunity (I GT < 35 ma) version High noise immunity: static dv/dt > 2 V/µs TO-22FPAB insulated