FAN SPEED CONTROLER - STMicroelectronics
FAN SPEED CONTROLER - STMicroelectronics
FAN SPEED CONTROLER - STMicroelectronics
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FSCTxxA-UH5<br />
Fig. 13: Step-down OUT voltage schematic.<br />
VCC<br />
Obsolete Product(s) - Obsolete Product(s)<br />
10/11<br />
R3<br />
1k<br />
U2<br />
2 5<br />
VCC OUT<br />
4<br />
1<br />
3<br />
VCC<br />
ON<br />
TEST<br />
GND<br />
FSCT<br />
DZ<br />
5V1<br />
R4<br />
{RD}<br />
V REF<br />
R1<br />
{RD}<br />
C1<br />
2n2<br />
2<br />
3<br />
R5<br />
{RN}<br />
-<br />
+<br />
R2<br />
8 4<br />
{RN}<br />
V<br />
R7<br />
{RF}<br />
OUT<br />
U1A<br />
MC33172<br />
1<br />
VCC<br />
R6<br />
{RF}<br />
R8<br />
{RF}<br />
PARAMETERS:<br />
RD = 33k<br />
RN = 68k<br />
RF = 130k<br />
6<br />
5<br />
-<br />
+<br />
R9<br />
{RF}<br />
U1B<br />
MC33172<br />
7<br />
V<br />
1<br />
2<br />
NEW<br />
VCC<br />
M1<br />
<strong>FAN</strong> MOTOR<br />
Q1<br />
2N2907
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