TPS54340_15 Datasheet, PDF (7/44 Pages) Texas Instruments – TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™

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Typical Characteristics (continued)
550
540
530
520
510
500
490
480
470
460
450
±50 ±25 0
25 50 75 100 125 150
T_J - Junction Temperature (ƒC)
C029
V_IN = 12 V
R_T = 200 kΩ
Figure 6. Switching Frequency vs Junction Temperature
2500
2000
1500
1000
500
0
0
V_IN = 12V
50
100
150
RT/CLK − Resistance (kΩ)
200
G007
Figure 8. Switching Frequency vs RT/CLK Resistance
High Frequency Range
120
110
100
90
80
70
60
50
40
30
20
±50 ±25 0
25 50 75 100 125 150
T_J - Junction Temperature (ƒC)
C033
V_IN = 12 V
Figure 10. EA Transconductance During Soft-Start vs
Junction Temperature
TPS54340
SLVSBK0B – OCTOBER 2012 – REVISED MARCH 2014
500
450
400
350
300
250
200
150
100
50
0
200 300 400 500 600 700 800
RT/CLK - Resistance (k )
ƒsw (kHz) = 92417 x R_T (kΩ) ^-0.991
R_T (kΩ) = 101756 x ƒsw (kHz) ^-1.008
900 1000
C030
Figure 7. Switching Frequency vs RT/CLK Resistance
Low Frequency Range
500
450
400
350
300
250
200
±50 ±25 0
25 50 75 100 125 150
T_J - Junction Temperature (ƒC)
C032
V_IN = 12 V
Figure 9. EA Transconductance vs Junction Temperature
1.3
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.2
1.19
1.18
1.17
1.16
1.15
±50 ±25 0
25 50 75 100 125 150
T_J - Junction Temperature (ƒC)
C034
V_IN = 12 V
Figure 11. EN Terminal Voltage vs Junction Temperature
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