MB3785A Datasheet, PDF (12/29 Pages) Fujitsu Component Limited. – Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)

MB3785A
(Continued)
7. Triangular wave maximum amplitude voltage
vs. Timing capacitance
2.4
VCC = 6 V
2.2
RT = 10 k
Ta = +25°C
2.0
1.8
1.6
1.4
1.2
1.0
0
50 10² 5 × 10² 10³ 5 × 10³10⁴ 5 × 10⁴10⁵
Timing capacitance CT (pF)
9. Triangular wave cycle vs. Timing capacitance
100
50
VCC = 6 V
RT = 10 kΩ
Ta = +25°C
10
5
1
0.5
0.2
10
10² 5 × 10² 10³ 5 × 10³ 10⁴
Timing capacitance CT (pF)
5 × 10⁴
11. Rate of change in triangular wave frequency vs.
Ambient temperature
(Not using ceramic resonator)
10
VCC = 6 V
5
fOSC = 460 kHz
(RT = 6.8 k, CT = 280 pF)
0
8. Triangular wave frequency
vs. Timing resistance
5M
VCC = 6 V
Ta = +25°C
1M
500 K
100 K
50 K
10 K
5K
CT = 68 pF
CT = 150 pF
CT = 300 pF
CT = 15000 pF
CT = 1500 pF
1 K 5 K10 K 50 K100 K 500 K 1 M
Timing resistance RT (Ω)
10. Duty vs. Triangular wave frequency
100
CH 1
80
VCC = 6 V
VDT = 1.60 V
Ta = +25°C
60
40
20
0
5 K 10 K
50 K 100 K
500 K 1 M
Triangular wave frequency (Hz)
12. Rate of change in triangular wave frequency vs.
Ambient temperature
(Using ceramic resonator)
10
VCC = 6 V
fOSC = 450 kHz
(RT = 8.5 kΩ, CT = 250 pF)
5
0
–5
–10
–40 –20 0 20 40 60 80 100
Ambient temperature Ta (°C)
–5
–10
–40 –20 0
20 40 60 80 100
Ambient temperature Ta (°C)
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12