STCC05-BD4 datasheet(7/13 Pages) STMICROELECTRONICS

7 / 13 page

STCC05-B

7/13

DC CHARACTERISTICS

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:

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.

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

Figure 6: Typical relay driver RL (1 to 3) on-

state voltage variation versus its current

Figure 7: Typical compressor relay driver RL4 on-

state voltage variation versus its current

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

5.1

5.2

20406080

100

Idd (mA)

Vdd (V)

Vin = 9V

Vin = 16V

Vdd (V)

4.9

4.925

4.95

4.975

5.025

5.05

-25

100

125

150

Tj(°C)

Idd = 5mA

Idd = 40mA

0.5

0.6

0.7

0.8

0.9

1.1

1020304050

Ion (mA)

Von (V)

Tj = -25ºC

Tj = 25ºC

Tj = 85ºC

0.5

0.6

0.7

0.8

0.9

1.1

100

150

Ion (mA)

Von (V)

Tj = -25ºC

Tj = 25ºC

Tj = 85ºC

- 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).

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