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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
VPS COMPRESSOR RELAY
RL 4
STCC05
V PS
IN4
20A RELAY DRIVER
P04
IN3
RL3
V PS
RELAY DRIVER
P03
IN2
POWER RELAYS
RL2
V PS
RELAY DRIVER
P02
IN1
RL1
V PS
RELAY DRIVER
P01
ENBZ
BZ2
V PS BUZZER DRIVER
P06
RS
BUZZER
BZ1
INBZ
VDD
PWM
VPS
SMPS
V PS
V PS 5V REGULATOR
V DD
VDD
RST\
VSS
CDD
COM
RESET
SYN
ZERO VOLTS SYNC. 30µs FILTER
ZVS
/RS T NMI
VPS
INS
LEVEL SHIFTER EMI FILTER
OUTS
P07
MCU
RINS AC Line VPS
JP
CUP
SPEED SENSOR
October 2004
REV. 1
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STCC05-B
Figure 2. Block diagram
VPS
Figure 3. Pin-out connections
RL4
VPS
20A RELAY DRIVER
IN4
VPS SYN INS RL1 RL2 RL3 RL4 BZ1
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VDD /RST ZVS OUTS IN1 IN2 IN3 IN4 INBZ COM
RL3
VPS
RELAY DRIVER
IN3
RL2
VPS
RELAY DRIVER
IN2
RL1
RELAY DRIVER VPS
IN1
BZ2
BUZZER DRIVER
ENBZ
BZ1
VPS
INBZ
VPS
5V REGULATOR
VDD
COM
RESET ZERO VOLTS SYNC.
RST\
BZ2
ZVS
SYN
30µs FILTER LEVEL SHIFTER
ENBZ
OUTS
INS
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 MCU
Thermal Shutdown
Over current Limiter
VDD
VDD
VDD
1.25 V Reference
VL
6kΩ
/RST
RUP > 100kΩ
VH
RESET 3kΩ VH = 3.75 V VL = 3.40 V
R1
R2
CUP = 100nF
VDD
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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.