MB3828 Datasheet, PDF (19/26 Pages) Fujitsu Component Limited. – Pentium DC/DC Converter IC

MB3828
s DC/DC CONVERTER SWITCHING OPERATION WAVEFORMS
<VCC = 5 V, VB = 5 V, Vin = 15V>
VS (V)
20
OUT1 (V) OUT2 (V)
60
30
15
50
25
10
40
20
5
30
15
0
20
10
−5
10
5
0
0
−10
−5
10 V
5V
0
2
VS _{5 V}
OUT1
OUT2
1 µs
4
6
8
VD4–VD0 = 00101 (1.8 V)
load: 2 A
fosc = 200 kHz setting
10
t (µs)
expansion
VS (V)
1
OUT1 (V) OUT2 (V)
60 30 ^0.5
50 25
0
40 20 ^−0.5
30 15 −1
20 10
10 5
00
−10 −5
10 V
5V
500 mV
OUT1
VS
OUT2
100 ns
10 V
500 mV
VS
OUT2
5V
OUT1
100 ns
0
0.2
0.4
0.6
0.8
1.0 0
0.2
0.4
0.6
0.8
1.0
t (µs)
t (µs)
Synchronous rectifier length: 250 ns (typ)
OUT1 tf: 60 ns (typ)
OUT2 tr: 130 ns (typ)
Synchronous rectifier length: 200 ns (typ)
OUT1 tr: 130 ns (typ)
OUT2 tf: 100 ns (typ)
19