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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
R
KFF
− Feedforward Impedance − kΩ
100 150 250 300 350 450200 400
4
2
8
6
10
14
12
18
16
20
V
UVLO
−
Programmable UVLO Threshold − V
UVLOV
ON
f
SW
= 300 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
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
TPS40075
SLUS676A – MAY 2006 – REVISED SEPTEMBER 2007
TYPICAL CHARACTERISTICS (continued)
UVLO THRESHOLD VOLTAGE UVLO THRESHOLD VOLTAGE
vs vs
FEEDFORWARD IMPEDANCE FEEDFORWARD IMPEDANCE
Figure 19. Figure 20.
UVLO THRESHOLD VOLTAGE TYPICAL MAXIMUM DUTY CYCLE
vs vs
FEEDFORWARD IMPEDANCE INPUT VOLTAGE
Figure 21. Figure 22.
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