Datasheet

-40 -20 0 25 50 75 100 125
TEMPERATURE (
o
C)
400
450
500
550
600
650
700
750
EA gm (Pmho)
0 1 2 3 4 5 6 7
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= 24V
V
IN
= 36V
30
40
50
60
70
80
90
100
-40 -20 0 25 50 75 100 125
1.232
1.2325
1.233
1.2335
1.234
1.2345
1.235
1.2355
1.236
1.2365
1.237
V
REF
(V)
TEMPERATURE (
o
C)
-40 -20 0 25 50 75 100 125
184
186
188
190
192
194
196
198
200
202
204
FREQUENCY (kHz)
TEMPERATURE (
o
C)
LM5642, LM5642X
SNVS219K –JUNE 2003–REVISED APRIL 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Operating Frequency vs Temperature
FB Reference Voltage vs Temperature (VIN = 28V)
Figure 18. Figure 19.
Error Amplifier Tranconductance Gain
vs Efficiency vs Load Current Using Resistor Sense
Temperature Ch.1 = 1.8V, Ch.2 = Off
Figure 20. Figure 21.
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