Datasheet

  
   
16
WWW.TI.COM
TYPICAL APPLICATION DATA
12 V
Sense
3.3 kΩ
5.1 kΩ
1 kΩ
12 V
12 V
2.5 V
1/4 TLC139/TLC339
1/4
TLC139/TLC339
5.1 kΩ
R1
R2
To µP Interrupt
Early Power Fail
5 V
5 V
10 kΩ
1 µFC
t
(see Note B)
To µP
Reset
V
CC
SENSE
RESIN
RESET
REF
C
T
GND
TL7705A
NOTES:A. V
UNREG
=
B. The value of C
t
determines the time delay of reset.
2.5
ǒ
R1 ) R2
R2
Ǔ
Monitors 5-V Rail
Monitors 12-V Rail
Early Power Fail Warning
V
UNREG
(see Note A)
Figure 20. Enhanced Supply Supervisor
12 V
12 V
12 V
5.1 kΩ
100 kΩ
100 kΩ
100 kΩ
22 kΩ
1/4
TLC139/TLC339
1/4 TLC139/TLC339
1/4 TLC139/TLC339
R1
100 kΩ
(see Note B)
R3
100 kΩ
(see Note B)
R3
5 kΩ
(see Note C)
12 V
12 V
5.1 kΩ
5.1 kΩ
Output 1
Output 2
Output 1
Output 2
C1
0.01 µF
(see Note A)
NOTES:A. Select C1 for a change in oscillator frequency where:
1/f = 1.85 (100 kΩ)C1
B. Select R1 and R3 to change duty cycle
C. Select R2 to change deadtime
Figure 21. Two-Phase Nonoverlapping Clock Generator