Complementary output hall effect latch ah277a, Data sheet typical applications, Typical performance characteristics (continued) – Diodes AH277A User Manual
Page 8: Ah277a
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A
8
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
Data Sheet
Typical Applications
Note 2: AH277A has Reversed Supply Voltage Protection. For DC fan application, sometimes need to test power
reverse connection condition. The internal diode only protects chip-side but not for coil-side. It is recommended to
add one external diode D1 in application to block the reverse current from coil-side as shown in Figure 13.
Figure 13. Typical Application Circuit with D1(Note 2)
Typical Performance Characteristics (Continued)
Figure 11. Supply Current vs. Ambient Temperature
Figure 12. Saturation Voltage vs. Ambient Temperature
-20
0
20
40
60
80
6
8
10
12
14
I
CC
(m
A
)
T
A
(
o
C)
V
CC
=3.5V
V
CC
=14V
V
CC
=20V
-20
0
20
40
60
80
200
250
300
350
400
450
500
550
600
V
SA
T
(m
V
)
T
A
(
o
C)
I
O
=300mA
I
O
=350mA
I
O
=400mA
V
CC
=14V
AH277A
V
CC
DO DOB GND
1
2
3
4
COIL1
COIL2
R1
470
R2
470
C1
2.2
µF
V
CC
D1
C2
2.2
µF
+
+