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Pin Definitions
FAN3121
3
4, 5
2
FAN3122
3
4, 5
2
Name
EN
GND
IN
Description
Enable Input . Pull pin LOW to inhibit driver. EN has logic thresholds for both
TTL and CMOS IN thresholds.
Ground . Common ground reference for input and output circuits.
Input .
6, 7
6, 7
OUT
OUT
Gate Drive Output . Held LOW unless required input is present and V DD is
above the UVLO threshold.
Gate Drive Output (inverted from the input). Held LOW unless required
input is present and V DD is above the UVLO threshold.
1, 8
1, 8
V DD
P1
Supply Voltage . Provides power to the IC.
Thermal Pad (MLP only) . Exposed metal on the bottom of the package;
may be left floating or connected to GND; NOT suitable for carrying current.
VDD 1
8
VDD
VDD 1
8 VDD
IN
EN
2
3
7
6
OUT
OUT
IN
EN
2
3
7 OUT
6 OUT
GND 4
5
GND
GND 4
5 GND
Figure 5.
FAN3121 Pin Assignments (Repeated)
Figure 6.
FAN3122 Pin Assignments (Repeated)
Output Logic
FAN3121
FAN3122
1
1
1
0
1
1
1
EN
0
0
(8)
(8)
IN
0
(8)
0
(8)
OUT
0
0
1
0
EN
0
0
(8)
(8)
IN
0 (8)
1
(8)
1
OUT
0
0
0
1
Note:
8. Default input signal if no external connection is made.
? 2008 Fairchild Semiconductor Corporation
FAN3121 / FAN3122 ? Rev. 1.0.3
3
www.fairchildsemi.com
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