MB3778 Datasheet, PDF (20/29 Pages) Fujitsu Component Limited. – Switching Regulator Controller

MB3778
(Continued)
Timing resistor vs. Oscillation
frequency
VCC = 6 V
Ta = +25 °C
1M
Triangular waveform cycle vs. Timing ca-
pacitor
100 _{VCC = 6 V}
RT = 15 kΩ
Ta = +25 °C
10
100 k
CT = 150 pF
10 k
CT = 1500 pF
CT = 15000 pF
1k
1k
5 k 10 k
50 k100 k
Timing resistor RT (Ω)
500 k
Temperature vs. Frequency stability
10
VCC = 6 V
CT = 330 pF
RT = 15 kΩ
0
1
10²
10³
10⁴
10⁵
Timing capacitor CT (pF)
Oscillation frequency vs. Duty
100
VCC = 6 V
CT = 330 pF
80
RT = 15 kΩ
Ta = +25 °C
60
40
−10
−40 −20
0 20 40 60 80 100 120
Temperature Ta (°C)
Control voltage vs. Reference voltage
5.0
VCC = 6 V
Ta = +25 °C
20
0
5 k 10 k
50 k 100 k
500 k 1 M
Oscillation frequency (Hz)
Control input current
500
VCC = 6 V
Ta = +25 °C
2.5
250
0
0
1
2
3
4
5
Control voltage VCTL (V)
0
0
4
8
12
16
20
Control voltage ICTL (V)
20