STCC05-B STMicroelectronics, STCC05-B Datasheet - Page 9

• Manufacturer Part Number: STCC05-B
• Description: Home appliance control circuit
• Manufacturer: STMicroelectronics

Specifications of STCC05-B

• Wide Range Input Supply Voltage Operation: 7 to 18V
• Ambient Temperature: - 20 to 85°C

■
Figure 11: Driver current sum versus regulator
current at T
The main heat sources of the circuit during operation are the voltage regulator and the relay coil drivers.
Depending of the power supply voltage V
of the package R
I
shown on figures 7 and 8.
■
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 V
with a suitable thermal resistance (R
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
■
The sound produced by the buzzer is controlled by the frequency of the square signal applied to the IN
input pin.
The external R
buzzer supplying envelope at power up and power down. Contrary to basic drivers, which directly apply
DD
0.35
0.25
0.15
0.3
0.2
0.1
V
STCC05 POWER PERFORMANCE VERSUS ITS THERMAL CAPABILITY
. In order to avoid spurious thermal shutdown of the system, it is advised to respect this relationship as
EXTENSION OF THE REGULATOR CURRENT CAPABILITY
FLOATING BUZZER OPERATION
PS
Σ
0
I
M
T
(A)
AMB
27Ω ½W
20 Ω ¼W
PS
R
R
=85°C
E
B
0.01
AMB
is high or the regulator is in current limiting mode. Therefore it is advised to use a package
S
= 85°C for V
C
th(j-a)
BD136
S
0.02
Q
network connected to the BZ
1
, the sum of all the coil driver currents ΣI
0.03
Regulator
5V-50mA
PS
V
STCC05
PS
=18V
= 12, 14, 16, 18V
0.04
th j-a
V
V
V
PS
PS
PS
=12V
=14V
=16V
).
PS
0.05
, the ambient temperature T
I
DD
V
DD
(A)
2
output pin produces a soft sound by smoothing the
Figure 12: Driver current sum versus regulator
current at T
Figure 14: Application diagram of the buzzer
drive
EN
0.35
0.25
0.15
IN
0.3
0.2
0.1
BZ
BZ
0
Σ
I
M
(A)
T
M
AMB
10 kΩ
is linked to the output regulator current
=70°C
0.01
AMB
V
IN
AMB
= 70°C for V
0.02
, and the thermal of resistance
V
PS
R
R
OH
BZ
= 1kΩ
=
1kΩ
0.03
PS
BZ
BZ
V
PS
2
1
= 12, 14, 16, 18V
=12V & 14V
0.04
R
S
STCC05-B
= 560 Ω
V
V
PS
PS
=16V
=18V
0.05
C
S
I
= 47 µF
DD
9/13
(A)
BZ