Datasheet

60 90 150 180 210 270120 240
4
2
8
6
10
14
12
18
16
20
R
KFF
− Feedforward Impedance − kΩ
V
UVLO
−
Programmable UVLO Threshold − V
UVLOV
ON
f
SW
= 500 kHz
UVLOV
OFF
40 60 100 120 140 18080 160
4
2
8
6
10
14
12
18
16
20
R
KFF
− Feedforward Impedance − kΩ
V
UVLO
−
Programmable UVLO Threshold − V
UVLOV
ON
f
SW
= 750 kHz
UVLOV
OFF
V
DD
− Input Voltage − V
V
DBP
− Driver Bypass Voltage − V
0
5
4
5 10 15 20 25
7
6
9
8
10
G024
8 16 20 24 28124
40
20
30
70
50
60
100
80
90
V
IN
− Input Voltage − V
Duty Cycle − %
UVLO
(on)
= 8 V
UVLO
(on)
= 15 V
UVLO
(on)
= 4.5 V
UVLO
(on)
= 12 V
G023
TPS40077
SLUS714D – JANUARY 2007 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS (continued)
UNDERVOLTAGE LOCKOUT THRESHOLD UNDERVOLTAGE LOCKOUT THRESHOLD
vs vs
FEED-FORWARD IMPEDANCE FEED-FORWARD IMPEDANCE
Figure 17. Figure 18.
TYPICAL MAXIMUM DUTY CYCLE DBP VOLTAGE
vs vs
INPUT VOLTAGE INPUT VOLTAGE
Figure 19. Figure 20.
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