MB3883 Datasheet, PDF (16/39 Pages) Fujitsu Component Limited. – 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

MB3883
Triangular wave upper and lower limit voltage
vs. triangular wave oscillator frequency
1
0.9
Ta = +25 °C
VCC = 5 V
0.8 RT = 18 kΩ
0.7
Upper
0.6
0.5
0.4
0.3
Lower
0.2
0.1
0
0
200 400 600 800 1000 1200
Triangular wave oscillator frequency fOSC (kHz)
Triangular wave upper and lower limit voltage
vs. ambient temperature
1
0.9
VCC = 5 V
RT = 18 kΩ
0.8 ^{CT = 100 pF}
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
−40 −20 0
Upper
Lower
20 40 60 80 100
Ambient temperature Ta ( °C)
Triangular wave oscillator frequency
vs. timing capacitor
10000
Ta = +25 °C
VCC = 5 V
1000
100
RT = 4.3 kΩ
RT = 100 kΩ ^{RT = 18 kΩ}
Triangular wave oscillator frequency
vs. timing resistor
10000
Ta = +25 °C
VCC = 5 V
1000
CT = 47 pF
100 CT = 1000 pF
CT = 100 pF
CT = 470 pF CT = 220 pF
10
10
10
100
1000
10000
1k
10 k
100 k
1M
Timing capacitor CT (pF)
Timing resistor RT (Ω)
Triangular wave oscillator frequency
vs. ambient temperature
560
VCC = 5 V
540
CTL = CTL1, 2 = CTL3 = CTL4 = CTL5 = 5 V
RT = 18 kΩ
CT = 100 pF
520
500
480
460
440
−40 −20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
16
(Continued)