Datasheet

100
1.5
0.5
200 300 400 500 600 700 800 900 1000
1.0
3.0
2.0
2.5
3.5
5.0
4.0
4.5
V
IN
= 28 V
V
IN
= 24 V
V
IN
= 18 V
V
IN
= 15 V
V
IN
= 12 V
V
IN
= 10 V
V
IN
= 8 V
V
IN
= 5 V
f
OSC
− Oscillator Frequency − kHz
V
OUT
− Output Voltage − V
T
J
− Junction Temperature − °C
I
BIAS
− Error Amplifier Input Bias Current − nA
−50 −25 50 100 1250 25 75
0
−90
−80
−70
−10
−30
−60
−20
−40
−50
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
f
SW
− Switching Frequency − kHz
0
100
0
200 400 600 800 1000
200
300
400
500
600
R
T
− Timing Resistance − kΩ
G017
TPS40077
www.ti.com ..................................................................................................................................................... SLUS714D – JANUARY 2007 – REVISED APRIL 2009
TYPICAL CHARACTERISTICS (continued)
ERROR AMPLIFIER INPUT BIAS CURRENT MINIMUM OUTPUT VOLTAGE
vs vs
JUNCTION TEMPERATURE FREQUENCY
Figure 13. Figure 14.
SWITCHING FREQUENCY UNDERVOLTAGE LOCKOUT THRESHOLD
vs vs
TIMING RESISTANCE FEED-FORWARD IMPEDANCE
Figure 15. Figure 16.
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