ACST8-8C STMICROELECTRONICS | Alldatasheet

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Technical content

ACST8-8C® January 2002 - Ed: 4B OVER VOLTAGE PROTECTED AC POWER SWITCH n VDRM /V RRM = +/- 800V n Avalanche controlled device n IT(RMS) = 8A with TCASE =9 0° C n High noise immunity: static dV/dt > 750 V/µs n Gate triggering current : IGT <3 0m A n Snubberless turn off commutation: (dI/dt)c > 4.5A/ms n TO-220FPAB package

FEATURES

The ACST8-8C belongs to the AC power switch family built around the ASD technology.This high performance device is adapted to home appliances or industrial systems and drives an induction motor up to 8A. This ACST 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 IEC61000-4-5 standards.

DESCRIPTION

n Enables equipment to meet EN61000-4-5 standard n High off-state reliability with planar technology n Need no external overvoltage protection n Reduces the power component count BENEFITS G COM OUT FUNCTIONAL DIAGRAM: n AC static switching in appliance & industrial control systems n Washing machine with bi-rotational induction motor drive n Induction motor drive for: - refrigerator / freezer compressor - air conditioning compressor MAIN APPLICATIONS ASD™ AC Switch Family COM G OUT TO-220FPAB

Symbol Parameter Value Unit VDRM / VRRM Repetitive peak off-state voltage 800 V IT(RMS) RMS on-state current full cycle sine wave 50 to 60 Hz Tcase = 90°C 8 A ITSM Non repetitive surge peak on-state current Tj initial = 25°C, full cycle sine wave tp = 20ms 80 A tp = 16.7ms 85 A I2t Thermal constraint for fuse selection tp = 10ms 35 A 2s dI/dt Non repetitive on-state current critical rate of rise IG = 10mA (tr < 100ns) Rate period > 1mn 100 A/ µs VPP Non repetitive line peak pulse voltage note 1 2k V Tstg Storage temperature range - 40 to + 150 °C Tj Operating junction temperature range - 40 to + 125 °C Tl Maximum lead soldering temperature during 10s 260 °C Note 1: according to test described by IEC61000-4-5 standard & Figure A. ABSOLUTE RATINGS (limiting values) Symbol Parameter Value Unit PG (AV) Average gate power dissipation 0.1 W PGM Peak gate power dissipation (tp = 20µs) 10 W IGM Peak gate current (tp = 20µs) 1 A GATE CHARACTERISTICS (maximum values) Symbol Parameter Value Unit Rth (j-a) Junction to ambient 60 °C/W Rth (j-c) Junction to case for full cycle sine wave conduction 3.5 °C/W THERMAL RESISTANCE Parameter Symbol Parameter description IGT Gate triggering current VGT Gate triggering voltage VGD Non triggering voltage IH Holding current IL Latching current VTM On state voltage VTO On state characteristic threshold voltage R D On state characteristic dynamic resistance IDRM /IRRM Forward or reverse leakage current dV/dt Static pin OUT voltage rise (dI/dt)c Turn off current rate of decay V CL Avalanche voltage at turn off PARAMETER DESCRIPTION

Symbol Test conditions Values Unit IGT VOUT = 12V (DC) RL =3 3Ω Tj = 25°C MAX. 30 mA VGT VOUT = 12V (DC) RL =3 3Ω Tj = 25°C MAX. 1.5 V VGD VOUT =V DRM R L = 3.3kΩ Tj =125°C MIN. 0.2 V IH IOUT = 100mA Gate open Tj = 25°C MAX. 40 mA IL IG = 20mA Tj = 25°C MAX. 70 mA VTM IOUT = 11A tp = 380µs Tj = 25°C MAX. 1.5 V VTO Tj = 125°C MAX. 0.95 V R D Tj = 125°C MAX. 50 m Ω IDRM IRRM VOUT =V DRM VOUT =V RRM Tj = 25°C MAX. 10 µA Tj = 125°C MAX. 1 mA dV/dt V OUT = 550V gate open Tj = 125°C MIN. 750 V/ µs (dI/dt)c Without snubber Tj = 125°C MIN. 4.5 A/ms VCL ICL = 1mA tp = 1ms Tj = 25°C TYP. 1200 V ELECTRICAL CHARACTERISTICS PER SWITCH For either positive or negative polary of pin OUT voltage respect to pin COM voltage The ACST8-8C device is especially designed to drive medium power induction motors in washing ma- chines, refrigerators, dish washers, and tumble dryers. Pin COM : Common drive reference, to be connected to the power line neutral Pin G : Switch Gate input to be connected to the controller Pin OUT : Switch Output to be connected to the load When driven from a low voltage controller, the ACST switch is triggered with a negative gate current flow- ing out of the gate pin G. It can be driven by the controller through a resistor as shown on the typical appli- cation diagram. In appliance systems, the ACST8-8C switch intends to drive medium power load in ON / OFF full cycle or phase angle control mode. Thanks to its thermal and turn-off commutation characteristics, the ACST8-8C switch is able to drive an inductive load up to 8A without a turn-off aid snubber circuit. In washing machine or drier appliances, the tumble rotates in both directions. When using bidirectional phase shift induction motor, two switches are connected on each side of the phase shift capacitor: in steady-state operation, one switch only conducts energising the coils and defining the tumble direction. AC LINE SWITCH BASIC APPLICATION

G TYPICAL APPLICATION DIAGRAM ROBUSTNESS AGAINST FAST CAPACITOR DISCHARGE When parasitic transients or controller mis-operation occur, the blocked switch may turn on by spurious switch firing. Since the phase shift capacitor is charged, its energy is instantaneously dissipated through the two ACSTs which can be destroyed. To prevent such a failure, a resistive inductive circuit R-L is added in series with the phase shift capacitor. The dI/dt depends on the maximal voltage V max of the phase shift capacitor (700V on 240V mains applica- tions), and on the inductance L: dI dt V L = max The total switch turn on di/dt is the sum of the di/dt created by any RC noise suppressor discharge and the dI/dt created by the motor capacitor discharge. Since the maximal di/dt capability at turn-on of the ACST8 is 100A/µs, the motor capacitor di/dt is assumed to be less than 50A/µs; therefore, the inductance should be 14µH. The resistor R limits the surge current through the ACST8 during the capacitor discharge according to the specified curve ITSM = f (tp) as shown in Figure 6(to be issued), and 1.2Ω is low enough to limit the resistor dissipation (usually less than 1 W). Finally both the 14µH inductance and the 1.2Ω resistance provide a safety margin of two on the surge cur- rent ITSM described in Figure 6. C L VAC T2ON R 700V M Fast capacitor discharge when one ACST switch turns on (T2) and the motor runs (T1 ON).

The ACST8-8C switch is able to safely withstand the AC line transient voltages either by clamping the low energy spikes or by breaking over under high energy shocks. The test circuit in Figure A is representative of the ACST application and is used to test the ACST switch according to the IEC61000-4-5 standard conditions. Thanks to the load impedance, the ACST switch with- stands voltage spikes up to 2 kV above the peak line voltage by breaking over safely. Such non repetitive testing can be done 10 times on each AC line voltage polarity. AC LINE TRANSIENT VOLTAGE RUGGEDNESS LR VAC +V PPSURGE VOLTAGE AC LINE & GENERATOR G COM OUT Fig. A:Overvoltage ruggedness test circuit for resistive and inductive loads according to IEC61000-4-5 standardR=4 7 Ω ,L=1 0 µ H&VPP = 2kV 012345678 IT(RMS)(A) α =180° P(W) 180° α α Fig. 1:Maximum power dissipation versus RMS on-state current. 0 25 50 75 100 125 Tc(°C) α =180° IT(RMS)(A) Fig. 2-1:RMS on-state current versus case temperature.

0.0 0.5 1.0 1.5 2.0 2.5 0 25 50 75 100 125 Tamb(°C) α =180° Printed circuit board FR4 Natural convection IT(RMS)(A) Fig. 2-2:RMS on-state current versus ambient temperature. 1.E-03 1.E-02 1.E-01 1.E+00 tp(s) Zth(j-a) Zth(j-c) K = [Zth/Rth] Fig. 3:Relative variation of thermal impedance versus pulse duration. 100 0123456 VTM(V) Tj=25°C Tj=125°C Tj max. : Vto = 0.95 V Rd = 50 mΩ Iout(A) Fig. 4:On-state characteristics (maximum val- ues). 1 10 100 1000 Number of cycles Non repetitive Tj initial=25°C Repetitive Tc=90°C t=20ms ITSM(A) Fig. 5:Surge peak on-state current versus number of cycles. 100 1000 0.01 0.10 1.00 10.00 tp(ms) Tj initial=25°C dI/dt limitation: 100A/µs ITSM I²t ITSM(A), I t(A s) Fig. 6:Non repetitive surge peak on-state current for a sinusoidal pulse with width tp < 10ms, and corresponding value of I 2t. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Tj(°C) IGT & IH IL IGT, IH, IL[Tj]/IGT, IH, IL[Tj=25°C] Fig. 7:Relative variation of gate trigger current, holding current and latching current versus junc- tion temperature (typical values).

Topology: Triac I8 AT(RMS): V 800VDRM: I C = 30mA GT Package FP: TO-220FPAB

ORDERING INFORMATION

0.1 1.0 10.0 100.0 dV/dt (V/µs) (dI/dt)c[(dV/dt)c] / Specified (dI/dt)c Fig. 8:Relative variation of critical rate of decrease of main current versus reapplied dV/dt (typical val- ues). 0 25 50 75 100 125 Tj(°C) (dI/dt)c[Tj] / (dI/dt)c[Tj=125°C] Fig. 9:Relative variation of critical rate of decrease of main current versus junction temperature. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 25 50 75 100 125 Tj(°C) Vout=550V dV/dt[Tj] / dV/dt[Tj = 125°C] Fig. 10:Relative variation of static dV/dt versus junction temperature

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap- proval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 2002 STMicroelectronics - Printed in Italy - All rights reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com Ordering type Marking Package Weight Base qty Delivery mode ACST8-8CFP ACST88C TO-220FPAB 2.4 g 50 Tube n Epoxy meets UL94,V0 OTHER INFORMATION PACKAGE MECHANICAL DATA TO-220FPAB (Plastic) H G F D E A B Dia 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