MB3885 Datasheet, PDF (11/29 Pages) Fujitsu Component Limited. – 1-channel DC/DC Converter IC with Synchronous Rectifier

MB3885
Triangular Wave Oscillator Frequency vs.
Timing Capacitor
10 M
1M
Ta = +25 °C
VCC = 12 V
CTL = 5 V
RT = 10 kΩ
100 k
10 k
1k
10
100
1000
10000
Timing capacitor CT (pF)
100000
Triangular Wave Oscillator Frequency vs.
Supply Voltage
250
240
Ta = +25 °C
RT = 10 kΩ
230
CT = 470 pF
220
210
200
190
180
170
160
150
0
5
10
15
20
Supply voltage VCC (V)
Triangular Wave Oscillator Frequency vs.
Timing Resistor
10 M
1M
Ta = +25 °C
VCC = 12 V
CTL = 5 V
CTL = 150 pF
100 k
CTL = 470 pF
10 k
1k
CTL = 15000 pF
100
1k
10 k
Timing resistor RT (Ω)
100 k
Triangular Wave Oscillator Frequency vs.
Ambient Temperature
250
240
VCC = 12 V
RT = 10 kΩ
230
CT = 470 pF
220
210
200
190
180
170
160
150
−40 −20 0 20 40 60 80 100
Ambient temperature Ta (°C)
Error Amp Gain, Phase vs. Frequency
40
Ta = +25 °C ₁₈₀
20
φ
90
0
AV
0
−20
−90
−40
1k
10 k
100 k
1M
Frequency f (Hz)
−180
10 M
VCC = 12 V
4.7 kΩ
− + ^{2.4 kΩ}
IN 10 µF
4.7 kΩ
1.5 V
240 kΩ
8−
6⁺
+
7
OUT
1.25 V ^{Error Amp.}
(Continued)
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