MB3889 Datasheet, PDF (12/35 Pages) Fujitsu Component Limited. – 2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

MB3889
Triangular Wave Oscillation Frequency
vs. Power Supply Voltage
330
325
320
315
310
305
300
295
290
285
280
275
270
0
Ta = +25 °C
RT = 47 kΩ
CTL = 5 V
5
10
15
20
Power supply voltage VCC (V)
Triangular Wave Oscillation Frequency
vs. Ambient Temperature
2
VCC = 12 V
1.5
RT = 47 kΩ
CTL = 5 V
1
0.5
0
−0.5
−1
−1.5
−2
−40 −20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
Error Amplifier Threshold Voltage
vs. Ambient Temperature
1.244
1.242
1.240
1.238
1.236
1.234
1.232
1.230
1.228
1.226
1.224
1.222
1.220
1.218
−40
VCC = 12 V
CTL = 5 V
−20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
Error Amplifier, Gain, Phase
vs. Frequency
40
Ta = +25 °C ₁₈₀
30
AV
ϕ
20
90
10 kΩ
10
1 µF 10 kΩ
+
0
0
IN
2.4 kΩ
−10
−20
−90
−30
10 kΩ 10 kΩ
−40
−180
4.2 V ^{VCC = 12 V}
240 kΩ
(15)
1^−
3⁺
(13) ₊
2
(14) _OUT
Error Amp1
(Error Amp2)
1.23 V
100 1 k 10 k 100 k 1 M 10 M
Frequency f (Hz)
12
(Continued)