STCC05-B Datasheet, PDF (7/13 Pages) STMicroelectronics – HOME APPLIANCE CONTROL CIRCUIT

STCC05-B
DC CHARACTERISTICS
Figure 4: Typical regulator voltage V_DD variation
versus its output current I_DD at T_J = 25°C
5.2
5.1 ^{Vdd (V)}
5
4.9
4.8
4.7
4.6
4.5
4.4
Vin = 9V
4.3
Vin = 16V
4.2
4.1
Idd (mA)
4
0
20
40
60
80
100
Figure 5: Typical regulator voltage V_DD variation
versus its junction temperature at V_IN = 12V
5.05
5.025
Vdd (V)
5
4.975
4.95
4.925
4.9
-25
0
Idd = 5mA
Idd = 40mA
25
50
Tj(°C)
75 100 125 150
Figure 6: Typical relay driver R_{L (1 to 3)} on-
state voltage variation versus its current
1.1
Von (V)
1
0.9
0.8
0.7
0.6
0.5
0
Tj = -25ºC
Tj = 25ºC
Tj = 85ºC
Ion (mA)
10
20
30
40
50
Figure 7: Typical compressor relay driver RL₄ on-
state voltage variation versus its current
1.1
Von (V)
1
0.9
0.8
0.7
0.6
0.5
0
Tj = -25ºC
Tj = 25ºC
Tj = 85ºC
50
Ion (mA)
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 V_PS should be split from the signal ground of V_DD,
(1)
- The STCC05 is placed as close as possible of the MCU,
(2)
- The supply capacitors would increase the system immunity by being placed closed to the blocks they feed, (3)
or putting decoupling capacitors (f.i. C_DD = C_PS = 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 IN_S of the speed sensor interface and the MCU reset pin (4)
(f.i. C_INS = 10nF; C_UP = 100nF).
Depending of the PCB layout quality, others capacitors may be put on sensitive pins such as the output
regulator pin V_DD and the zero crossing synchronization input pin SYN.
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