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STCC05-BD4

P1-P3P4-P6P7-P9P10-P12P13-P13
®
1/13
STCC05-B
HOME APPLIANCE CONTROL CIRCUIT
October 2004 REV. 1
BUZZER
R
S
POWER RELAYS
COMPRESSOR RELAY
V
PS
MCU
/RS
T
P
02
P
03
P
01
NMI
V
DD
C
UP
PWM
P
06
P
07
C
DD
V
SS
V
DD
P
04
V
PS
AC Line
STCC05
V
PS
SMPS
SPEED
SENSOR
V
PS
JP
R
INS
BUZZER
DRIVER
V
PS
V
PS
V
PS
RELAY DRIVER
RELAY DRIVER
RELAY DRIVER
20A RELAY
DRIVER
V
PS
V
PS
5V REGULATOR
RESET
LEVEL SHIFTER
EMI FILTER
30µs FILTER
ZERO VOLTS SYNC.
V
PS
RST\
OUT
S
IN
BZ
IN
3
IN
4
IN
1
IN
2
ZVS
V
DD
EN
BZ
COM
BZ
1
V
PS
IN
S
SYN
RL
1
RL
2
RL
3
RL
4
BZ
2
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
V
PS
RST\
OUT
S
IN
BZ
IN
3
IN
4
IN
1
IN
2
ZVS
V
DD
EN
BZ
RST\
OUT
S
IN
BZ
IN
3
IN
4
IN
1
IN
2
ZVS
V
DD
EN
BZ
COM
BZ
1
V
PS
IN
S
SYN
RL
1
RL
2
RL
3
RL
4
BZ
2
COM
BZ
1
V
PS
IN
S
SYN
RL
1
RL
2
RL
3
RL
4
BZ
2
DIP-20
Table 1. Order Code
Part Number Marking
STCC05-BD4 STCC05-B
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
■ MCU reset circuit with activation delay time and
hysteresis (3.75V Hi, 3.4V Lo)
■ 30µs digitally filtered inverting Zero Voltage
Synchronization
■ Three 50mA relay coil drivers with demagnetiz-
ing diode
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
■ 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
STCC05-B
2/13
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 T
AMB
, the load
current I
DD
and the input voltage V
PS
, contributing directly to the ADC accuracy.
The regulator includes also an over current limiter and a thermal shutdown. The over current limiter pro-
tects 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. More-
over, 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.
Figure 2. Block diagram Figure 3. Pin-out connections
RL
4
IN
4
IN
3
IN
2
IN
1
RL
3
RL
2
RL
1
BZ
2
EN
BZ
IN
BZ
V
DD
RST\
ZVS
BZ
1
VP
S
COM
SYN
IN
S
OUT
S
V
PS
20A RELAY
DRIVER
RELAY DRIVER
RELAY DRIVER
RELAY DRIVER
5V REGULATOR
BUZZER
DRIVER
V
PS
V
PS
V
PS
V
PS
V
PS
30µs FILTER
EMI FILTER
ZERO VOLTS SYNC.
RESET
LEVEL SHIFTER
V
PS
IN
S
RL
1
OUT
S
RL
2
RL
3
RL
4
BZ
1
BZ
2
EN
BZ
SYN /RST
IN
3
IN
4
IN
BZ
COM
IN
1
IN
2
ZVS
V
DD
1
2
3
4
5
6
7
8
9
10
13
12
11
16
15
14
17
18
19
20
1.25 V
Reference
V
PS
V
DD
R
1
R
2
Over current
Limiter
R
SENSE
Thermal
Shutdown
V
H
= 3.75 V
V
L
= 3.40 V
V
DD
/RST
V
DD
V
H
V
L
C
UP
=
100nF
RESET
V
DD
3kΩ
6kΩ
V
DD
R
UP
> 100kΩ
MCU
STCC05-B
3/13
■ 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 V
DD
. The /RST pin goes high when V
DD
is higher than
the high threshold V
H
= 3.75V and after a delay time T
UP
; and is low when the V
DD
decreases below the
low threshold V
L
= 3.4V after the delay time T
DW
.
These delays are set by an external capacitor C
UP
connected to the /RST pin and depend on the trigger
thresholds of /RST: For C
UP
= 100nF, T
UP
= 400µs with V
TH
= V
H
/2; T
DW
= 200µs with V
TH
= V
L
/2.
■ The Zero Voltage Synchronization ZVS circuit
The Zero Voltage Synchronization ZVS circuit generates the signal ZVS that synchronizes the whole oper-
ation 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 R
ZV
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 imple-
mented to provide a higher immunity to the MCU operation. Its output signal ZVS is inverted respect to the
input signal V
SYN
.
■ 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 V
PS
= 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 RL
I
(I=1, 2, 3).
The diode is connected between the output pin RL
I
and the supply pin V
PS
.
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 repre-
sentative of 20A relays such as G4A-E-DC12, OMIF-S-112 or UKH12S series.
SYN
ZVS
V
DD
S
1
S
2
Q
30 µs FILTER
COM
70 kΩ
25 kΩ
30 kΩ
P1-P3P4-P6P7-P9P10-P12P13-P13

STCC05-BD4

Mfr. #:
Buy STCC05-BD4
Manufacturer:
STMicroelectronics
Description:
Power Management Specialized - PMIC Home App Control Cir
Lifecycle:
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