MB3881 Datasheet, PDF (15/40 Pages) Fujitsu Component Limited. – 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down

MB3881
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Triangular wave upper and lower limit voltage
vs.triangular wave oscillator frequency
1
0.9
Ta = +25 °C
VCC = 9 V CT = 100 pF
0.8
Upper
0.7
0.6
0.5
0.4
0.3
0.2
Lower
0.1
0
0 100 200 300 400 500 600 700 800 900 1000
Triangular wave oscillator frequency fOSC (kHz)
Triangular wave upper and lower limit voltage
vs. ambient temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
−40
VCC = 9 V
RT = 11 kΩ CT = 100 pF
Upper
Lower
−20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
Triangular wave oscillator frequency
vs. timing capacitor
10000
Ta = +25 °C
VCC = 9 V
1000
10000
Triangular wave oscillator frequency
vs. timing resistor
Ta = +25 °C
VCC = 9 V
1000
100
10
1
RT = 6.8 kΩ
RT = 11 kΩ
RT = 51 kΩ
10
100
1000
Timing capacitor CT (pF)
10000
100
10
1k
CT = 47 pF
CT = 100 pF
CT = 220 pF
CT = 470 pF
CT = 680 pF
10 k
Timing resistor RT (Ω)
100 k
Triangular wave oscillator frequency
vs. ambient temperature
560
VCC = 9 V
540
CTL−1 = CTL−2 = CTL−3 = CTL−4 = 5 V
RT = 11 kΩ
CT = 100 pF
520
500
480
460
440
−40 −20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
Power dissipation vs. ambient temperature
1000
800
600
400
200
0
−40 −20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
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