Fairchild SEMICONDUCTOR RC5040 User Manual
Page 22
AN42
APPLICATION NOTE
22
Component Case Temperature
Note:
Case temperatures are all within guidelines. Our guideline is that case temperatures for all components should be below 105
°
C
@25
°
C Ambient.
Comments:
Excellent input ripple voltage. Input ripple voltage is recommended to be less than 5% of the output voltage.
Device
Description
Case Temperature
(
°
C)
I
load
= 9.9A
Case Temperature
(
°
C)
I
load
= 12.4A
Case Temperature
(
°
C)
I
load
=13.9A
Q3A
MOSFET
K1388
57
63
56.3
Q3B
MOSFET
K1388
58
64
66.6
L1
Inductor,
Unknown
53
56
61.2
Q2
Schottky Diode
2048CT
66
70
87
IC
Raytheon RC5040
52
54
58
Cin
Input Capacitor 1000
µ
F
38.2
36.8
39
Cout
Output Capacitor
1500
µ
F
35
34.8
38.2
Evaluation Summary:
The on-board DC-DC converter is fully functional. It has
excellent load regulation, transient response, and input
voltage ripple.
Attachment A
Attachment B