Datasheet

TC646B/TC648B/TC649B
DS21755C-page 6  2002-2013 Microchip Technology Inc.
FIGURE 1-4: TC646B/TC648B/TC649B Electrical Characteristics Test Circuit.
1
2
3
4
6
5
7
8
V
IN
C
F
V
AS
GND
FAULT
/ OTF
SENSE
V
OUT
V
DD
R
3
R
1
C
3
0.1 µF
C
2
1µF
V
DD
C
1
0.1 µF
+
-
V
IN
+
-
C
4
0.1 µF
V
AS
+
-
R
2
K
1
K
2
0.1 µF
1µF
.01 µF
C
7
C
6
C
5
R
4
V
SENSE
(pulse voltage source)
K
4
K
3
+
-
Current
limited
voltage
source
V
DD
R
5
Current
limited
voltage
source
C
8
0.1 µF
R
6
Note: C
5
and C
7
are adjusted to get the necessary 1 µF value.
TC646B and TC649B
TC646B
TC648B
TC649B
+
-