MB3821 Datasheet, PDF (10/24 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC With Synchronous Rectifier

MB3821
(Continued)
Duty vs. oscillator frequency (ch1)
100
Ta = +25 °C
90
VCC = 16 V
80
CTL = 5 V
SEL = 0 V
70
60
50
40
30
20
10
0
10 k
100 k
1M
Oscillator frequency fOSC (Hz)
Triangular wave oscillator frequency
vs. timing resistance
10 M
1M
Ta = +25 °C
VCC = 16 V
CTL = 5 V
SEL = 0 V
100 k
CT = 100 pF
CT = 500 pF
Duty vs. oscillator frequency (ch1)
100
Ta = +25 °C
90
VCC = 16 V
80
CTL = 5 V
SEL = 5 V
70
60
50
40
30
20
10
0
100
1k
10 k
Oscillator frequency fOSC (Hz)
Triangular wave oscillator frequency
vs. timing resistance
1M
100 k
Ta = +25 °C
VCC = 16 V
CTL = 5 V
SEL = 5 V
CT = 100 pF
10 k
CT = 500 pF
10 k
CT = 15000 pF
1k
1k
10 k
100 k
Timing resistance RT (Ω)
Triangular wave oscillator frequency
vs. power supply voltage
250
240
230
220
210
200
190
180
170
160
150
0
Ta = +25 °C
CTL = 5 V
SEL = 0 V
RT = 10 kΩ, CT = 500 pF
10
20
30
40
50
Power supply voltage VCC (V)
1k
100
1k
CT = 15000 pF
10 k
Timing resistance RT (Ω)
100 k
Triangular wave oscillator frequency
vs. power supply voltage
25
24
Ta = +25 °C
CTL = 5 V
23
SEL = 5 V
22
RT = 10 kΩ, CT = 500 pF
21
20
19
18
17
16
15
0
10
20
30
40
50
Power supply voltage VCC (V)
10