TPS54372-Q1 Datasheet, PDF (6/17 Pages) Texas Instruments – 3-A OUTPUT TRACKING/TERMINATION SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs

TPS54372-Q1
SGLS267E − OCTOBER 2004 − REVISED JUNE 2008
TYPICAL CHARACTERISTICS
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
120
VIN = 3.3 V
100 ^{IO = 3 A}
80
60
40
20
0
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 1
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
90
80 VIN = 5 V
I_O = 3 A
70
60
50
40
30
20
10
0
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 2
EXTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
800
700
RT = 68 kΩ
600
500
RT = 100 kΩ
400
300
RT = 180 kΩ
200−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 4
DEVICE POWER LOSSES
vs
LOAD CURRENT
2.25
2
T_J − 125°C
f_s = 700 kHz
1.75
1.5
1.25
V_I = 3.3 V
1
0.75
0.5
V_I = 5 V
0.25
0
0
1
2
3
4
I_L − Load Current − A
Figure 5
ERROR AMPLIFIER
OPEN LOOP RESPONSE
140
0
120
R_L = 10 kΩ,
C_L = 160 pF,
−20
T_A = 25°C
−40
100
−60
80
Phase
−80
60
−100
40
20
0
−20
1
−120
Gain
−140
−160
−180
−200
10 100 1 k 10 k 100 k 1 M 10 M
f − Frequency − Hz
Figure 7
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INTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
750
650
550
450
RT = Open
350
250
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 3
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
3.80
3.65
3.50
3.35
3.20
3.05
2.90
2.75
−40
0
25
85
125
T_J − Junction Temperature − °C
Figure 6
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