Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Typical Performance Characteristics (Continued)
300
AH277A
250
θ
JC,
θ
JA ( C/W)
o
200
150
100
θ
JC
θ
JA
50
0
-30
-15
0
15
30
45
60
75
90
T
A
( C)
o
Figure 11. Thermal Resistance vs. Ambient Temperature
Typical Applications
D1
AH277A
COIL1
V
CC
DO
DOB GND
COIL2
1
2
3
4
V
CC
+
R1
470
C1
2.2µF
+
R2
470
C2
2.2µF
Figure 12. Typical Application Circuit with D1(Note 2)
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 12.
Jul. 2006 Rev. 1. 2
8
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
