MB3785A_03 Datasheet, PDF (12/30 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
2.2
VCC = 6 V
RT = 10 kΩ
2.0
Ta = +25° C
1.8
1.6
1.4
1.2
1.0
0.8
50 10² 5 × 10² 10³ 5 × 10³ 10⁴ 5 × 10⁴ 10⁵
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 kΩ, CT = 280 pF)
0
−5
−10
−40 −20 0
20 40 60
Ambient temperature Ta (°C)
80 100
12
8. Triangular wave frequency
vs. Timing resistance
5M
VCC = 6 V
Ta = +25°C
1M
500 k
100 k
50 k
10 k
5k
1k
C T = 68 pF
C T = 150 pF
C T = 300 pF
C T = 1500 pF
C T= 15000 pF
5 k 10k 50 k 100 k 500 k 1 M
Timing resistance RT (Ω)
10. Duty vs. Triangular wave frequency
100
CH 1
80
VCC = 6 V
VDT = 1.6 V
Ta = +25°C
60
40
20
0
5 k 10k
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
5
fOSC = 450 kHz
(RT = 8.5 kΩ, CT = 250 pF)
0
−5
−10
−40 −20 0
20 40 60 80 100
Ambient temperature Ta (°C)
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