TPS54540
SLVSBX7 –MAY 2013
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TYPICAL CHARACTERISTICS
ON RESISTANCE vs JUNCTION TEMPERATURE
VOLTAGE REFERENCE vs JUNCTION TEMPERATURE
0.25
0.2
0.15
0.1
0.05
0
0.814
0.809
0.804
0.799
0.794
0.789
0.784
BOOT-SW = 3 V
BOOT-SW = 6 V
V
= 12 V
Series1
IN
œ50
œ25
0
25
50
75
100
125
150
œ50
œ25
0
25
50
75
100
125
150
C025
C026
TJ - Junction Temperature (°C)
TJ - Junction Temperature (°C)
Figure 1.
Figure 2.
SWITCH CURRENT LIMIT vs JUNCTION TEMPERATURE
SWITCH CURRENT LIMIT vs INPUT VOLTAGE
9
9
8.5
8
œ40 °C
Series1
VSer=ies12 V
IN
25 °C
Series2
150 °C
Series4
8.5
8
7.5
7
7.5
7
6.5
6
6.5
6
œ50
œ25
0
25
50
75
100
125
150
0
7
14
21
28
35
42
C027
C028
TJ - Junction Temperature (°C)
VI - Input Voltage (V)
Figure 3.
Figure 4.
SWITCHING FREQUENCY vs RT/CLK RESISTANCE
LOW FREQUENCY RANGE
500
SWITCHING FREQUENCY vs JUNCTION TEMPERATURE
550
RT = 200 kꢀ,
VIN = 12 V
Series1
540
530
520
510
500
490
480
470
460
450
450
400
350
300
250
200
150
100
FSW (kHz) = 92417 x RT (kꢀ)œ0.991
RT (kꢀ) = 101756 x FSW (kHz)œ1.008
œ50
œ25
0
25
50
75
100
125
150
200
300
400
500
600
700
800
900 1000
C029
C030
TJ - Junction Temperature (°C)
RT/CLK - Resistance (kꢀ)
Figure 5.
Figure 6.
6
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