STMICROELECTRONICS STCC05-B

STCC05-B
®
HOME APPLIANCE CONTROL CIRCUIT
APPLICATIONS
■
■
■
■
Home Appliance digital control
AC Power drive and functional safety management
Air Conditioner, Refrigerator and Oven applications
Compressor, fan, heater and valve drive circuit
FEATURES
■ Wide range input supply voltage operation:
7 to 18V
■ 5 V +/- 5% full tolerance voltage regulator and
50mA output current
DIP-20
■ MCU reset circuit with activation delay time and
hysteresis (3.75V Hi, 3.4V Lo)
Table 1. Order Code
■ 30µs digitally filtered inverting Zero Voltage
Synchronization
Part Number
Marking
■ Three 50mA relay coil drivers with demagnetizSTCC05-BD4
STCC05-B
ing diode
■ One 150mA relay coil driver with demagnetizing diode for a 20A relay
■ One 30mA peak enhanced buzzer driver with enable pin and soft turn off
■ 12 to 5V robust non inverting level shifter for speed sensor or door switch interface
■ Ambient temperature: - 20 to 85°C
BENEFITS
■ Higher module compactness with reduced component count
■ Drastic reduction of soldered pins on the board for lower use of lead metal
■ Faster module assembly time
■ High transient burst immunity and ESD robustness compliant with IEC61000-4 standards
■ Enhanced functional reliability
■ Enhanced circuit parametric quality
■ Easy to design for short time to market
Figure 1: STCC05 based Air Conditioner application diagram
STCC05
VPS
COMPRESSOR RELAY
V PS
RL 4
IN4
RL3
P04
20A RELAY
DRIVER
V PS
IN3
P03
RELAY DRIVER
V PS
RL2
POWER RELAYS
IN2
P02
RELAY DRIVER
V PS
RL1
IN1
P01
RELAY DRIVER
BZ2
ENBZ
V PS
P06
RS
BUZZER
BUZZER
DRIVER
BZ1
VDD
INBZ
PWM
VPS
V PS
V PS
V DD
VDD
5V REGULATOR
SMPS
COM
RESET
ZERO VOLTS SYNC.
SYN
ZVS
LEVEL SHIFTER
INS
OUTS
P07
EMI FILTER
MCU
CUP
RINS
AC Line
CDD
/RS
T
NMI
30µs FILTER
VPS
VSS
RST\
VPS
JP
SPEED
SENSOR
October 2004
REV. 1
1/13
STCC05-B
Figure 2. Block diagram
Figure 3. Pin-out connections
VPS
RL4
20A RELAY
DRIVER
VPS
RL3
RELAY DRIVER
IN4
VPS
1
20
VDD
IN3
SYN
2
19
/RST
IN2
INS
3
18
ZVS
IN1
RL1
4
17
OUTS
RL2
5
16
IN1
RL3
6
15
IN2
RL4
7
14
IN3
BZ1
8
13
IN4
BZ2
9
12
INBZ
10
11
COM
VPS
RL2
RELAY DRIVER
VPS
RL1
RELAY DRIVER
VPS
BZ2
BUZZER
DRIVER
ENBZ
INBZ
BZ1
VPS
VPS
VDD
5V REGULATOR
COM
RST\
RESET
ZERO VOLTS SYNC.
SYN
ZVS
30µs FILTER
ENBZ
LEVEL SHIFTER
INS
OUTS
EMI FILTER
FUNCTIONAL DESCRIPTION
The STCC05 is a control circuit embedding most of the analog & power circuitry of an air conditioner or
refrigirator control module. It interfaces the micro-controller MCU with the AC power and cooling process
sections.
The voltage supply
The 5V voltage regulator supplies the micro-controller MCU. Its input voltage ranges from 7V to 18V; and
its average DC output current up to 50mA. With an output filtering capacitor of 100µF, its output voltage
accuracy is better than +/- 5% in the whole operating range of the ambient temperature TAMB, the load
current IDD and the input voltage VPS , contributing directly to the ADC accuracy.
The regulator includes also an over current limiter and a thermal shutdown. The over current limiter protects the regulator against output short circuits and inrush currents during the power up. The current limiter
is made of a serial shunt resistance as current sensor and a circuit that regulates the input current. Moreover, the thermal shutdown protects the whole circuit against overload operations. It is made of a thermal
sensing junction and a hysteresis comparator that is able to switch off the passing element.
■
RSENSE
VPS
VDD
Thermal
Shutdown
VDD
VDD
VDD
1.25 V
Reference
R1
3kΩ
VH = 3.75 V
VDD
/RST
RUP > 100kΩ
RESET
VL
R2
6kΩ
VH
VL = 3.40 V
2/13
MCU
Over current
Limiter
CUP =
100nF
STCC05-B
■ The reset circuit
This circuit ensures a Low Voltage Detection (LVD) of the output of the regulator. Most micro-controllers
have an active RESET pin in the low state: so, the /RST pin will be active at low state.
The reset comparator senses the regulator voltage VDD. The /RST pin goes high when VDD is higher than
the high threshold VH = 3.75V and after a delay time TUP; and is low when the VDD decreases below the
low threshold VL = 3.4V after the delay time TDW.
These delays are set by an external capacitor CUP connected to the /RST pin and depend on the trigger
thresholds of /RST: For CUP = 100nF, TUP= 400µs with VTH= VH/2; TDW= 200µs with VTH= VL/2.
■ The Zero Voltage Synchronization ZVS circuit
The Zero Voltage Synchronization ZVS circuit generates the signal ZVS that synchronizes the whole operation with the AC line cycle (20 ms on 50 Hz or 16.7 ms on 60 Hz). This signal allows the MCU to control
the AC loads and achieve the timing functions.
The input pin SYN is an image of the mains voltage. It is connected to either the power supply transformer
through a resistor RZV or an opto-coupler that is controlled directly by the AC line voltage. The circuit is
protected against fast line transient voltages: a robust ESD protection and a 30µs digital filter are implemented to provide a higher immunity to the MCU operation. Its output signal ZVS is inverted respect to the
input signal VSYN.
VDD
30 µs FILTER
25 kΩ
S1
Q
SYN
70 kΩ
ZVS
S2
30 kΩ
COM
■ The relay coil drivers
These robust circuits allow a DC relay coil to be driven by an MCU output. The relay coil has a minimum
resistance of 580Ω and has a power up to 0.25W for VPS = 12 V. These characteristics are representative
of 3A relays such as FTR-F3AA-12V or JQ1A-12V series.
The output stage is made of a transistor and a demagnetization diode. The transistor is referred to the
ground COM, has a DC current rating of 50mA; and its collector is connected to the output RLI (I=1, 2, 3).
The diode is connected between the output pin RLI and the supply pin VPS.
Moreover, a fourth coil driver has an extended 150mA current capability to be able to drive the coil of a
relay having a 130Ω minimum resistance and a 1.1W maximum power. These characteristics are representative of 20A relays such as G4A-E-DC12, OMIF-S-112 or UKH12S series.
3/13
STCC05-B
VPS
VPS
Demagnetizing Diode
4 kΩ
INI
10 kΩ
ROH = 1kΩ
RL I
VIN
10 kΩ
BZ 2
ENBZ
Relay
Transistor
RBZ= 1kΩ
BZ 1
VIN
INBZ
The buzzer driver with enable control
The MCU can excite a warning buzzer with a 50% PWM signal. The buzzer driver amplifies this signal in
current and translates it from the 5V MCU output to the VPS supply to produce the right sound level from
the buzzer.
The output stage is made of a NPN transistor, a PNP transistor and two 1kΩ resistors.
The NPN transistor, referred to the power ground COM, is controlled by the input INBZ; its collector is connected to the output BZ1. The input INBZ is driven by a simple push-pull MCU buffer.
The PNP transistor, referred to the VPS polarity, is controlled by the input ENBZ; and its collector is connected to the output BZ2 through a 1kΩ resistor. The input ENBZ is driven by a simple push-pull MCU
buffer.
The pin BZ2 is the supply terminal of the buzzer; and the circuit has a DC current rating of 9mA and the
PWM section runs from 10Hz up to 5kHz.
A 1kΩ resistor RBZ is connected between the BZ1 and BZ2 pins to discharge the buzzer periodically. Moreover, the addition of an external capacitor-resistor network on BZ2 pin will allow the buzzer to turn on and
off smoothly when the pin ENBZ is toggling.
■
■ The speed sensor level shifter
The OUTS signal is generated by an electronic signal such as the indoor fan speed clock issued of a Hall
Effect sensor or a door switch signal and is transmitted to the MCU. As the INS input may be disturbed; a
spike suppressor and a simple EMI filter are added to increase the input robustness. The output signal
OUTS is not inverted with respect to the input signal INS.
VDD
VDD
EMI
Filter
50 kΩ
500Ω
INS
50 kΩ
50 kΩ
4/13
OUT S
STCC05-B
Table 2: Absolute Ratings (limiting values)
Symbol
VDD
VPS
VSYN
Pin
VDD
VPS, INS
SYN
BZ1, BZ2,
RLx, x = 1 to 4
Parameter name & conditions
Output supply voltage
Power supply voltage, level shifter input
ZVS input voltage, RZV = 15kΩ
VI
IN1, IN2, IN3
Input logic voltage
VO
ZVS, OUTS, /RST
Output logic voltage
VPS
Maximum sourced current pulse, tp = 10ms
Maximum sunk driver current pulse, tp = 10ms
Maximum DC sunk current
Maximum sunk driver current pulse, tp = 10ms
Maximum DC sunk current
Maximum diver diode reverse current
Average output current
Peak output current, tp = 50µs
Maximum DC sunk current in all relay drivers
VPS = 16V, TAMB= 70°C, IDD= 50mA, DIP-20
Maximum DC sunk current in all relay drivers
VPS = 16V, TAMB= 85°C, IDD= 25mA, DIP-20
Maximum dissipation, DIP-20, TAMB= 70°C
Operating ambient temperature
Operating junction temperature
Storage junction temperature
VMO
RLx, x = 1 to 3
IM
RL4
IBZ AV
IBZ PK
RLx, x = 1 to 4
BZ1, BZ2
BZ1, BZ2
ΣIM
RLx, l = 1 to 4
PDIS
TAMB
All
AII
TJ
All
Output voltage
Value
- 0.3 to 6
- 0.3 to 20
- 1 to 20
- 0.3 to
VPS + 0.3
- 0.3 to
VDD + 0.3
- 0.3 to
VDD + 0.3
500
60
50
160
150
1
±2
± 50
Unit
V
V
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
220
mA
300
0.90
- 20 to 85
- 10 to 150
- 25 to 150
W
°C
°C
°C
Table 3: Electromagnetic Compatibility Ratings
(TJ = 25°C, according to typical application diagram of page 1, unless otherwise specified)
Symbol
Node
Parameter name & conditions
Value
VESD
All pins
ESD protection, MIL-STD 883 method 3015, HBM model
±2
VESD
INS, SYN,
VPS, VDD
ESD protection, IEC 61000-4-2, per intput, in air (1)
±2
ESD protection, IEC 61000-4-2, per intput, in contact (1)
±2
VPPB
All pins
Total peak pulse voltage Burst, IEC 61000-4-4, (2)
±4
Unit
kV
Note 1: System oriented test circuit with RZV = 15kΩ, RINS = 2.2kΩ and CDD = CPS = 100nF
Note 2: System oriented test circuit; refer to application section
Table 4: Thermal Resistance
Symbol
Parameter
Value
Unit
Rth(j-a)
DIP-20 thermal resistance junction to ambient
Single PCB with a copper thickness = 35µm and surface SCU = 0.5cm2
90
°C/W
5/13
STCC05-B
Table 5: Electrical Characteristics (TJ = 25°C, VCC = 12V, unless otherwise specified)
Symbol
Pin
Name
Conditions
Min.
Typ
Voltage supply
IDD = 5 to 40mA
Tamb = 0 to 70°C
VPS = 9 to 16V
CDD = 100µF
VIN1 to 4 = 0V
VDD
VDD
Output voltage supply
VPS
ISQ
VPS
VPS
Input supply voltage
Quiescent supply current
IIN_SC
VPS
Limiting input current
TOFF
∆T
VDD
V
VH
VL
VHYS
VDD
Shutdown temperature
Releasing thermal hysteresis
Reset circuit
Disabling reset threshold
Enabling reset threshold
Threshold hysteresis
CUP = 100nF, VTH = VH/2,
Disabling reset delay time
RUP = 100kΩ
TUP
/RST
TDW
TD
VTH
ISYN
VOH
VOL
IIN4
VON
IINx
VON
VRL H
VINx
VINBZ
FBUZ
ROH
4.75
VDD = 5V, IDD = 0 (open)
VDD = 0V
Output in short circuit
50
BZ2
VON
BZ1
VENBZ
RBZ
ENBZ
5
5.25
V
1.3
18
2
V
mA
80
120
mA
170
15
°C
°C
3.4
3.1
3.75
3.4
0.35
4
3.6
200
400
800
200
400
30
1.1
0.3
0.9
70
1.4
CUP = 100nF, VTH = VL/2,
100
RUP = 100kΩ
Zero Voltage synchronization circuit
ZVS Transition filtering time
Rising and falling step
10
SYN Transition threshold
0.6
VSYN = 5V
SYN Input nominal current
VSYN = 18V
Level shifter, zero voltage synchronization, reset circuits
LVOUT High level output voltage
0.8 VDD
/RST
ZVS Low level output voltage
INBZ
Unit
7
Enabling reset delay time
IN4
RL4
IN1 to 3
RL1 to 3
RL1 to 4
IN1 to 4
Max.
Relay coil drivers
VIN4 = 5V
ION = 150mA, VIN4 > 3.1V
VINx = 5V
ION = 50mA, VINx > 3.1V
VINx < 50.8V, RL = 580Ω
Input activating current
On state output voltage
Input activating current
On state output voltage
Off state output voltage
0.9 VPS
Transition threshold
0.8
Buzzer driver with enable control
Input muting voltage
0.8
Buzzer PWM frequency
Duty cycle = 50%
0.01
On state output resistance
VINBZ = 0V, VENBZ > 3.1V,
IBZ2 = 5mA
On state output voltage
ION = 25mA, VINBZ > 3.1V,
VENBZ = 0V, tp = 50µs
Enable threshold voltage
0.8
BZ1 - BZ2 Buzzer resistance
V
µs
1.5
µs
V
mA
V
0.85
1
0.85
1
1.9
1.5
0.2 VDD
V
1.4
1.2
1.4
1.2
VPS
3.1
mA
V
mA
V
V
V
3.1
5
V
kHz
1
kΩ
1
1.4
V
2
1
3.1
V
kΩ
18
0.8
800
V
V
µA
Speed sensor level shifter
VINS H
VINS L
IINS
6/13
INS
High level detection
Low level detection
Internal input current
7
VINS = 12V
500
STCC05-B
DC CHARACTERISTICS
Figure 4: Typical regulator voltage VDD variation
versus its output current IDD at TJ = 25°C
Figure 5: Typical regulator voltage VDD variation
versus its junction temperature at VIN = 12V
5.2
Vdd (V)
5.1
5.05
5
Vdd (V)
5.025
4.9
4.8
5
4.7
4.975
4.6
4.5
4.95
4.4
Vin = 9V
4.3
Idd = 5mA
4.925
Vin = 16V
4.2
4.1
Idd (mA)
-25
4
0
20
40
60
80
Idd = 40mA
Tj(°C)
4.9
0
25
50
75
100
125
150
100
Figure 6: Typical relay driver RL (1 to 3) onstate voltage variation versus its current
1.1
Figure 7: Typical compressor relay driver RL4 onstate voltage variation versus its current
1.1
Von (V)
Von (V)
1
1
0.9
0.9
0.8
0.8
0.7
0.7
Tj = -25ºC
Tj = -25ºC
Tj = 25ºC
0.6
0.6
Tj = 85ºC
Tj = 25ºC
Tj = 85ºC
Ion (mA)
Ion (mA)
0.5
0.5
0
10
20
30
40
50
0
50
100
150
AIR CONDITIONER APPLICATION CONSIDERATIONS
■ IMMUNITY IMPROVEMENT OF STCC05 AND THE MICROCONTROLLER
Some basic rules can be applied to improve the STCC05 immunity in its application:
- The power ground of VPS should be split from the signal ground of VDD,
- The STCC05 is placed as close as possible of the MCU,
- The supply capacitors would increase the system immunity by being placed closed to the blocks they feed,
or putting decoupling capacitors (f.i. CDD = CPS = 100nF)
- Large supply wire on the PCB should be avoided to reduce sensitivity to radiated interferences.
- A decoupling capacitor can be put on the pin INS of the speed sensor interface and the MCU reset pin
(f.i. CINS = 10nF; CUP = 100nF).
(1)
(2)
(3)
(4)
Depending of the PCB layout quality, others capacitors may be put on sensitive pins such as the output
regulator pin VDD and the zero crossing synchronization input pin SYN.
7/13
STCC05-B
Figure 8: Example of PCB layout improvement for higher immunity
2
VPS
VPS
VDD
VDD
5VREG
3
3
RST\
Reset
RST\
4
MCU
SMPS
STCC05
VSS
COM
1
1
STCC05 ELECTROMAGNETIC COMPATIBILITY
Standards such as IEC61000-4-x evaluate the electromagnetic compatibility of appliance systems. To test
the immunity level of the STCC05 to the IEC61000-4-4 (Electrical Fast Transient Bursts), a board representative of usual application control unit should be considered by applying the immunity design rules
defined in the previous paragraph.
IEC61000-4-4 test does not allow any measurement equipment to be connected to the tested system, as
it would corrupt the test results. That is why this board should include a remote monitoring circuit based
on optic fibers. Thus, without any electrical link with an oscilloscope, it is possible to monitor the VDD voltage as well as the /RST or the ZVS outputs of the STCC05, during the IEC61000-4-4 test. This optical link
detects parasitic commutations of outputs as short as 60ns.
With this board, and the burst generator coupled to the mains as specified in the IEC61000-4-4 standard
(see the following principle diagram), the STCC05 has been tested successfully at 4kV.
■
Figure 9: IEC61000-4-4 Electrical Fast Transient
Burst general STCC05 test circuit
Figure 10: Test circuit schematic
MAINS
TR1
15V 5VA
VPS
Rzv 15k
Cps_1
100uF
VDD
Cps_2
100nF
D1~D4
1N4002
U1
STCC05-B
1
2
MAINS FILTER
L
Czv
15nF
3
4
SPEED SENSOR
MAINS
VPS
5
PE
Rins
2.2k
6
7
0.5 kV to 4 kV
N
Cins
10nF
8
BUZZER
tr : 5ns
tp : 50 ns
BURST COUPLER
RELAY 1
BURST
GENERATOR
VDD
SYN
RST
INs
ZVS
RL1
OUTs
RL2
IN1
RL3
IN2
RL4
IN3
BZ1
IN4
BZ2
INBZ
ENbz
COM
Cdd_2
100nF
RST
20
19
18
17
16
Cup
100nF
ZVS
LS
SW1
15
14
VDD
SW2
13
12
SW3
11
SW4
L
PE
9
10
SYSTEM TESTED
Cdd_1
100uF
Vps
RELAY 2
RELAY 3
COMPRESSOR RELAY
STCC05
Rs
560
Cs
47uF
BATTERY
N
VPS
9V5
Oscilloscope
10 cm
Optical Receiver
HFBR-0410
Optic Fiber
Optical Transmitter
VDD
RST
LS
ZVS
TEST BOARD
8/13
STCC05-B
■
STCC05 POWER PERFORMANCE VERSUS ITS THERMAL CAPABILITY
Figure 11: Driver current sum versus regulator
current at TAMB = 85°C for VPS = 12, 14, 16, 18V
Figure 12: Driver current sum versus regulator
current at TAMB = 70°C for VPS = 12, 14, 16, 18V
Σ IM(A)
Σ IM(A)
0.35
0.35
VPS=12V & 14V
VPS=12V
0.3
0.25
0.3
0.25
VPS=14V
VPS=16V
0.2
0.2
TAMB =85°C
TAMB =70°C
VPS=16V
0.15
0.15
VPS=18V
0.1
0
0.01
0.02
0.03
IDD(A)
0.04
0.05
VPS=18V
0.1
IDD(A)
0
0.01
0.02
0.03
0.04
0.05
The main heat sources of the circuit during operation are the voltage regulator and the relay coil drivers.
Depending of the power supply voltage VPS, the ambient temperature TAMB, and the thermal of resistance
of the package Rth(j-a), the sum of all the coil driver currents ΣIM is linked to the output regulator current
IDD. In order to avoid spurious thermal shutdown of the system, it is advised to respect this relationship as
shown on figures 7 and 8.
■ EXTENSION OF THE REGULATOR CURRENT CAPABILITY
The output current capability of the STCC05 voltage regulator can be increased in a cost effective manner
by adding an external ballast transistor and two biasing resistors. With such a circuit, the output voltage
regulation remains at 5V 5%, and the current limitation is still active.
Such a topology generates also power losses in the external power transistor especially when the supply
voltage VPS is high or the regulator is in current limiting mode. Therefore it is advised to use a package
with a suitable thermal resistance (Rth j-a).
An example is proposed in the following figure doubling the regulator current capability of the solution to
100mA while producing a current limitation typically at 110mA.
Figure 13: Circuit diagram to extend the
STCC05 regulator current to 100mA
Figure 14: Application diagram of the buzzer
drive
VPS
VPS
RE
Q1
27Ω ½W
BD136
ROH = 1kΩ
BZ 2
10 kΩ
RS= 560 Ω
ENBZ
RB
20 Ω ¼W
STCC05
5V-50mA
Regulator
RBZ= 1kΩ
VDD
CS= 47 µF
VIN
INBZ
BZ 1
■ FLOATING BUZZER OPERATION
The sound produced by the buzzer is controlled by the frequency of the square signal applied to the INBZ
input pin.
The external RS CS network connected to the BZ2 output pin produces a soft sound by smoothing the
buzzer supplying envelope at power up and power down. Contrary to basic drivers, which directly apply
9/13
STCC05-B
the voltage to the buzzer, this circuit feeds the buzzer with the exponential voltage induced by the charge
and the discharge of the RS CS network.
The ROH and RS resistors contribute to reduce high harmonic sound distortions. Indeed, they limit the peak
current through the buzzer, feed the buzzer with the CS capacitor voltage, and limit the current through
the low side NPN transistor of the driver.
Therefore to set rising/falling durations of the sound shape, it is advised to adjust only the value of the CS
capacitor.
The integrated RBZ resistor is selected to discharge the buzzer when the low side transistor is off, especially at the maximum operating frequency. The buzzer is completely discharged within five times the time
constant of the resistor-buzzer with τ = RBZ x CBUZZER.
Therefore, RBZ < 1 / (10 x FMAX x CBUZZER). Since the buzzer capacitance CBUZZER is about 20nF at the
maximum operating frequency of driver is 5kHz, this RBZ resistance is set at 1kΩ.
Figure 15: Buzzer terminal voltages VBZ1 & VBZ2
and buzzer current IBZ
Figure 16: Buzzer terminal voltage VBZ2 with
buzzer enable and input circuit signals
VBZ2
VBZ1
INBZ
VBZ2
IBZ
ENBZ
Time : 100µs/div , VBZ1 & VBZ2 : 4V/div , IBZ : 20mA/div
Time : 100ms/div , VBZ2 , ENBZ & INBZ : 5V/div
ZERO CROSSING DETECTION CIRCUITS
The detection of the zero crossing of the AC line voltage can be achieved at least on two ways with the
STCC05, depending of the power supply unit.
When the power supply uses a magnetic 50/60Hz transformer, the input pin SYN is connected to a transformer output through a resistor RZV, the electrical path being closed by the low side bridge diodes.
■
Figure 17: ZVS circuit operation using the AC
secondary of a transformer
VTF
VAC
VSYN
VZVS
VDD
20µs FILTER
15 kΩ
AC
LINE
RZV
25 kW
S1
Q
ZVS
S2
VSYN
VTF
10/13
SYN
100 kΩ
COM
VZVS
The delay between the real Zero Crossing event
and the falling edge of ZVS depends on the internal filtering time, the resistance RZV, the rectifier
drop voltage VF, the VPS supply load and the temperature. The STCC05 contribution to this delay
can be evaluated by measuring the delay between
its input voltage VTF and its output voltage VZVS.
When using VF = 0.8V, RZV = 15kΩ, VPS = 15V,
ICC = 20mA, it is about 50 µs on rising voltage VTF
and 115 µs on falling voltage VTF.
When the power supply uses a switch mode power
supply, the input pin SYN is synchronized by an
opto-coupler, which is connected to the mains terminals through high resistances. The isolator output is on all the time except during the zero
crossing where no more current feeds the input
and the output transistor switches off.
STCC05-B
Finally, the opto-coupler could be connected directly in high side mode between the SYN and the VDD
pins: the ZVS signal is then made of high level pulses synchronized with the zero crossing. However, the
coupler could be connected in low side mode with an external 10k pull-up resistor to VDD: the ZVS is now
inverted with low level pulses.
Figure 18: ZVS circuit operation with an opto-coupler
V AC
V AC
IOPTO
IOPTO
VSYN
VSYN
VZVS
VZVS
V DD
V DD
V DD
V DD
RUP
20µs FILTER
20µs FILTER
VAC
SYN
25 kΩ
10 kΩ
ZVS
S1
SYN
25 kΩ
V SYN
100 kΩ
ZVS
S1
Q
Q
S2
S2
VAC
V SYN
V ZVS
100 kΩ
V ZVS
COM
COM
Figure 19: Ordering Information Scheme
STCC
X
-
B
Z
Circuit configuration and
related application
05 = Air conditioner control
Typical power supply voltage
B = 12V
Package
D4 = DIP-20
11/13
STCC05-B
Figure 20: DIP-20 Package Mechanical Data
DIMENSIONS
REF.
I
a1
L
B
b
b1
e
F
e3
Z
Millimetres
Min.
Typ. Max. Min.
a1
0.508
0.020
B
1.39
1.65 0.055
E
20
11
1
10
Typ. Max.
0.065
b
0.45
0.018
b1
0.25
0.010
D
D
Inches
25.4
1.000
E
8.5
0.335
e
2.54
0.100
e3
22.86
0.900
F
7.1
0.279
I
3.93
0.155
L
3.3
Z
0.130
1.34
0.053
Table 6: Ordering Information
Part Number
Marking
Package
Weight
Base qty
STCC05-BD4
STCC05-B
DIP-20
1.4 g
20
Table 7: Revision History
12/13
Date
Revision
05-Oct-2004
1
Description of Changes
First issue
Delivery
mode
Tube
STCC05-B
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