View STCC08_4331689.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

STCC08
AC switch failure mode detector
Features

3.3 V and 5 V power supply compatible ACS, ACST, TRIAC compatible Gate driver output: 28 mA max sink current Adjustable gate drive current Sense the AC switch voltage in both AC line polarities Diode mode failure detection for solid state AC switches Short circuit failure detection for AC switches, relays, electromechanical switches Open AC switch detection for AC switches, relays, electromechanical switches SO-8 SMD package
SO-8
Applications

Home appliances ACS, ACST, TRIAC drive AC switch failure modes detection Zero voltage synchronization
Benefits

Description
The STCC08 is an AC switch failure mode detector and an AC power switch driver. It drives the AC switch and informs the MCU of switch failure. The MCU takes the appropriate actions to put the system in a secure state. Diode-mode, short circuit detection and open switch in both AC line polarities are detected. The STCC08 helps home appliances to meet the IEC 60335-1 safety standard. The STCC08 can be easily interfaced to an MCU with its CMOS input AC switch driver and CMOS compatible output for the failure mode detector.
Enable appliances to meet IEC 60335-1 and IEC 60730-1 standards Enable appliances to meet IEC 61000-4-4 standard Eliminates high DC current in inductive load, by detecting the diode mode failure Improve system safety monitoring open switch failure with critical loads such as door locks Enable MCU to sense all AC switch failure modes and protect the appliance Less MCU pin allocated to AC failure detection multiple STCC08 designed with resistor dividers uses one I/O Easy to drive with MCU directly connected or through an opto coupler Highly compact with integrated solution in SMD version

March 2008
Rev 1
1/13
www.st.com 13
Characteristics
STCC08
1
Characteristics
Figure 1. Circuit block diagram
G
GATE DRIVER
IN + RIG
VCC
AVF DRIVER
AC
AVF
POWER SWITCH SIGNAL SHAPING
GND
Table 1.
Symbol IN AVF AC VCC G RIG GND
Circuit pin descriptions
Type SIGNAL SIGNAL SIGNAL POWER SIGNAL SIGNAL POWER Logic AC switch drive Alternating voltage feedback: AC switch status output AC switch status sense input Positive power supply AC switch gate driver output AC switch gate current setting Power supply reference Description
Figure 2.
Pin layout (top view)
IN AVF N/C AC
GND RIG G VCC
2/13
STCC08 Table 2.
Pin # 1 2 3 4 5 6 7 8
Characteristics Pin allocations
Name IN AVF N/C AC VCC G RIG GND Logic AC switch drive Alternating voltage feedback: AC switch status output Not connected AC switch status sense input Positive power supply AC switch gate driver output AC switch gate current setting Power supply reference Description
Table 3.
Symbol VCC VIN IG IAC VAVF IAVF TJ
Absolute ratings (Tamb = 25 C unless otherwise stated, respect to GND)
Pin VCC IN G AC AVF AVF All Storage junction temperature range -40 to 150 C Parameter name and conditions Power supply voltage Switch activation voltage Sunk driver current Input sense current peak Alternative feedback voltage Maximum feedback current Junction temperature range Value 0 to 6 -0.3V to VCC +0.3 30 2.2 -0.3 to VCC +0.3 5 -20 to 125 Unit V V mA mA V mA C
Table 4.
Symbol VCC IG RIG RAC
Recommended operating conditions
Pin VCC G RIG AC Detector resistance for AC line = 230 V HV biasing resistance for AC line = 120 V HV biasing resistance for AC line = 230 V All All Operating ambient temperature range Operating junction temperature range 300 -20 to 85 -20 to 125 k C C 300 100 k k Parameter name and conditions Power supply voltage respect to GND Max. sunk driver gate current Gate current setting resistor Detector resistance for AC line = 120 V Value 2.97 to 5.5 28 30 100 Unit V mA k
RSHUNT TAMB TJ
3/13
Characteristics Table 5.
Symbol
STCC08 Electrical characteristics
Pin Name Conditions Min Typ Max Unit
Switch drive (respect to GND, Tj=25 C unless otherwise specified, RIG=30 ) IQUIESCENT VON VOFF IIN IG IAC VCC Quiescent current IN IN IN G AC On-state switch activation voltage Off-state switch release voltage Input drive current Gate drive current Detection threshold Vin > Von Vin > Von 20 82 IN = GND 0.7*VCC 0.3*VCC 50 28 236 2 mA V V A mA A
Status output (respect to GND, Tj=25 C unless otherwise specified) VOH AVF Minimum output voltage IAVF = 50 A IAVF = 50 A (CMOS Compatible) VOL AVF Maximum drop voltage I AVF = 5 mA (Opto-transistor compatible) 0.7*VCC 0.3*VCC V V
1
V
Table 6.
Symbol RTH (j-a)
Thermal resistance
Parameter name and conditions SMD Thermal resistance Junction to Ambient Value 140 Unit C/W
Table 7.
Symbol
System related electromagnetic compatibility ratings
Node Pin VCC Neutral Parameter name and conditions ESD protection, IEC 61000-4-2, per input, against air discharge Gate through ACS; ESD protection, IEC 61000-4-2, pin to ground, against air discharge Alternating current through RAC = 300 k; ESD protection, IEC 61000-4-2, pin to ground, against air discharge ESD protection, IEC 61000-4-2, pin to ground, for contact discharge(1) 6 kV 8 kV Value Unit
VESD Line VESD
G AC
Neutral VCC
VCC Total Peak Pulse Voltage Burst, IEC 61000-4-4(1) Neutral VPPB Line G AC Gate through ACS; Total Peak Pulse Voltage Burst, IEC 61000-4-4 (1) Alternating current through RAC; Total Peak Pulse Voltage Burst, IEC 61000-4-4(1) 4 kV
1. System oriented test circuits - see Application note AN2716
4/13
STCC08
Functional description
2
Functional description
STCC08 functional description
The STCC08 is a power circuit designed to drive up to 10 mA IGT AC switches and to detect AC switch failure modes through MCU diagnostic. It embeds a logic switch driver, an AC switch diode mode detection, a short circuit detection and an AC switch open detection. STCC08 can be powered by a 3.3 V or 5 V power supply voltage.
Switch driver
This driver is a logic level buffer (CMOS compatible) interfacing directly with the AC switch and the microcontroller. The AC switch must be driven in negative polarity: AC switch COM = A1 = VCC The drive Boolean rule is: Vin > Von: switch = ON Vin < Von: switch = OFF The AC switch can be driven in continuous, pulsed or angle phase modes. In insulated applications, the input can be driven through an opto-coupler powered with a non-insulated auxiliary power supply. RIG pin allows the AC switch gate current to be set. A resistor must be connected between this pin and the ground GND. This resistor is defined according to the miminmum ambient temperature and the AC switch IGT (see Figure 3). This optimizes the consumption of the application. Figure 3. Rig = f(Tamb_min) for 5/10 mA AC switches
RIG_Max( )
130 120 110 100 90 80 70 60 50 40 30 20 10 0
AC switch 10 mA @ 25 C AC switch 5 mA @ 25 C
-20
-15
-10
-5
0
5
10
15
20
25
30
Tamb_min (C)
5/13
Functional description
STCC08
Failure mode detection
This function detects AC switch failure modes required by the IEC 60335 standard:
The AC switch diode mode failure in both negative and positive AC line polarities This failure is simulated with a diode placed in parallel with the power switch according to the IEC 60335-1 standard.

The AC switch short-circuit failure mode, any external shorting and any spurious power switch turn-on The open AC switch failure mode
This function improves the system safety. A diode mode failure, a short circuit or an AC switch open can lead to dangerous situations for the system or the user. The AVF block monitors the state of the AC switch in both AC polarities. Its output AVF is transmitted to the MCU for failure detection. The MCU detects the failure according to the following truth table: Table 8. STCC08 status truth table with RSHUNT in parallel with the load
AVF Open collector Open collector to 0 toggle 0 0 Open collector MCU DIAGNOSTIC AC switch OK Diode mode Short AC switch AC switch OK Open AC switch
IN (MCU generated) 0 0 0 1 1
For a diode mode, the AVF output toggles from open collector to GND each the half of the AC mains. Therefore, the AVF output is a pulsed signal during a diode mode failure. The MCU can put the system in a safe configuration, switching off the front end relay already existing in home appliance designs.
Status reading
The AVF output is an open collector, active at low level. It can either be connected to a MCU input, in pull up input configuration, or through an opto-coupler in insulated designs. For inductive loads, there is a phase shift between load current and AC line voltage. When the ACS control is removed:

The AC switch - latch structure - still conducts and the AVF is at low level until the next zero current crossing. The AVF is at low level until next zero current crossing. In the worst case, the load current crosses zero close to peak mains voltage. Then the AVF signal should be read at peak mains voltage.
6/13
STCC08 Figure 4.
Functional description Failure mode detection for inductive loads in DC control mode
NORMAL MODE
SHORT CIRCUIT
DIODE MODE
AC LINE
LOAD CURRENT
IN
AVF SUGGESTED READING TIME NORMAL MODE SHORT CIRCUIT DIODE MODE
The microcontroller can store the AC switch drive signal in a RAM register when it is driving the STCC08 input. Therefore it can save gate energy while determining conduction state from this RAM register and multiplexing this information with AVF signal. AC LINE: High voltage between AC line and neutral LOAD CURRENT: Current through the AC load IN: MCU output driving the STCC08 IN input. AVF: Alternating voltage feedback, output of the STCC08
7/13
Application information
STCC08
3
Application information
Figure 5. Application example with an MCU direct drive + ACS
3.3V to 5V
VCC IN + ACS RIG
NEUTRAL
G
GATE DRIVER
RIG
VCC RSHUNT RAC
VCC
AVF DRIVER
AC
AVF
LOAD
SW
POWER SWITCH SIGNAL SHAPING
GND
LINE
MCU
The placement of a 100 nF capacitor between VCC and GND close to the STCC08 is advised. SW is an electromechanical switch that is part of the application design, for example, the water sensor in a washing machine.
3.1
Recommendations
The STCC08 is designed for 5 and 10 mA ACSs, ACSTs and TRIACs.
STCC08 basic application
The microcontroller reads the AC switch state from the AVF output of the STCC08. The microcontroller can power-off the application driving a front-end relay. Figure 6.
NEUTRAL
Non-insulated application
3.3V to 5V
GATE DRIVER
IN + ACS RIG VCC
G
RIG
VCC
VCC
RSHUNT
RAC
AVF DRIVER
AC
AVF
LOAD
SW
POWER SWITCH SIGNAL SHAPING
GND
LINE FRONT END RELAY SAFETY TURN OFF
MCU
8/13
STCC08
Application information This function is effective whatever the drive and the nature of the load. Figure 7. ACS benefits
NEUTRAL
VCC
G VMAX = V CL ACS RAC2 AC
RAC1
The ACS clamping capability, from 800 V to 1100 V reduces the stress across RAC resistors during an AC line over-voltage. This provides a robust solution and allows setting high voltage resistors RAC to withstand the ACS clamping voltage instead of the AC line maximum over-voltage.
STCC08 AVF alarms configuration
Figure 8. Open load and Short circuit ACS discrimination
NEUTRAL
3.3V to 5V
VCC IN + -
G
GATE DRIVER
ACS
RIG
RIG
VCC RSHUNT RAC
VCC
AVF DRIVER
AC
AVF
LOAD
SW
POWER SWITCH SIGNAL SHAPING
GND
LINE
MCU
When RSHUNT is removed, the MCU cannot discriminate between an ACS short circuit and open load failure. See Table 9.
9/13
Application information Table 9. STCC08 status truth table with RSHUNT removed
AVF Open collector Open collector to 0 toggle 0 0 Open collector
STCC08
IN (MCU generated) 0 0 0 1 1
MCU DIAGNOSTIC AC switch OK Diode mode Short circuit or open lead AC switch OK Open AC switch
STCC08 ZVS application
Figure 9. ZVS application schematic
NEUTRAL
3.3V to 5V
GATE DRIVER
IN + VCC
ACS
G
RIG
VCC
VCC
AVF DRIVER
LINE RAC AC
ZVS
POWER SWITCH SIGNAL SHAPING
GND
MCU
The gate driver drives an ACS while the failure detector is used independently for ZVS detection
10/13
STCC08
Package information
4
Package information
Epoxy meets UL94, V0
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at www.st.com. Table 10. SO-8 dimensions
Dimensions Ref.
Seating Plane C A2 A1 A
Millimeters Min. Typ. Max. 1.75 0.1 1.25 0.28 0.17 4.80 5.80 3.80 0.25 0.40 1.04 0 8 0.10 0 4.90 6.00 3.90 1.27 0.50 1.27 0.010 0.016 0.48 0.23 5.00 6.20 4.00 0.25 0.004 0.049 0.011 0.007 Min.
Inches Typ. Max. 0.069 0.010 0.019 0.009
h x 45
A A1 A2 b C D E
C
k L
b ppp C D
e
L1
0.189 0.193 0.197 0.228 0.236 0.244 0.150 0.154 0.157 0.050 0.020 0.050 0.041 8 0.004
8
5 E1 E
E1 e h L L1 k ppp
1
4
Figure 10. Footprint dimensions in mm(inches)
6.8 (0.268) 0.6 (0.024) 4.2 (0.165) 1.27 (0.050)
Figure 11. Marking
XXXXX : Marking ZZ : Manufacturing location Y : Year WW : week
xxxxxx
a
z z y ww
Pin 1
11/13
Ordering information
STCC08
5
Ordering information
Table 11. Ordering information
Marking STCC08 STCC08 Weight 0.08 g 0.08 g Base Qty 100 2500 Delivery Mode Tube Tape and reel 13"
Order code STCC08 STCC08RL
6
Revision history
Table 12.
Date 20-Mar-2008
Document revision history
Revision 1 Initial release. Changes
12/13
STCC08
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.
(c) 2008 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 - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
13/13

▲Up To Search▲

Price & Availability of STCC08

	To Download STCC08 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .