ꢀ ꢁꢂ ꢃꢄ ꢂꢅ
ꢀ ꢁꢂ ꢃꢄ ꢂꢆ
SLUS557B − MARCH 2003 − REVISED APRIL 2004
APPLICATION INFORMATION
+
V
IN
V
5 V
OUT
390 Ω
42 V to 56 V
1 A to 10 A
−
+
4.7 µF
0.8 µH
15 V
15
13
VCC
VC
1N 5820
0.1 µF
16 VREF
OUTB 14
6 µF
1 kΩ
−
5:1
10 kΩ
2
1
NI
OUTA 11
UC28025
ILIM/SD
100 Ω
4.7 µF 12 Ω
1 kΩ
1 kΩ
4.3 kΩ
4.7 µF
150 pF
INV
9
1 nF
22 pF
3.3 kΩ
3
4
5
EAOUT RAMP
7
6
8.2 kΩ
120 pF
10 nF
1 kΩ
CLOCK
CT
C
T
RT
PGND 12
470 pF
GND
10
SS
8
1.5 kΩ
0.1 µF
UDG−03047
Figure 1. Typical Application: 1.5 MHz, 48-V to 5-V DC/DC Push-Pull Converter Using UC28025
7
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