MB3870 Datasheet, PDF (19/25 Pages) Fujitsu Component Limited. – Pentium II DC/DC Converter IC

MB3870
s DC/DC CONVERTER SWITCHING OPERATION WAVEFORMS
<VCC = 5 V, VB = 5 V, Vin = 5V>
OUT1 (V) ^{VS (V)}
OUT2 (V) ⁸
5V
30
6
25
4
20
2
15
0
10
−2
OUT1
5
0
5V
−5
0
2
2V
VS
VD4 − VD0 = 00001 (2.0 V)
load: 5 A
fosc = 200 kHz setting
OUT2
1 µs
4
6
8
10
t (µs)
expansion
OUT1 (V) ^{VS (V)}
OUT2 (V) ¹
5V
30
0.5
25
0
20
−0.5
15
−1
10
−1.5
5
0
5V
−5
500 mV
VS
OUT1
OUT2
100 ns
5V
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: 400 ns (typ)
OUT1 tf: 35 ns (typ)
OUT2 tr: 130 ns (typ)
Synchronous rectifier length: 200 ns (typ)
OUT1 tr: 80 ns (typ)
OUT2 tf: 50 ns (typ)
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