MB3878 Datasheet, PDF (10/24 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging

MB3878
Triangular wave oscillator frequency vs.
timing resistor
1M
Ta = +25 °C
VCC = 19 V
CTL = 5 V
100 k
10 k
10 k
100 k
1M
Timing resistor RT (Ω)
Triangular wave oscillator frequency
340
330
320
310
300
290
280
270
260
250
240
−40 −20 0
VCC = 19 V
CTL = 5 V
RT = 47 kΩ
20 40 60 80 100
Ambient temperature Ta ( °C)
Triangular wave oscillator frequency vs.
power supply voltage
340
Ta = +25 °C
330
CTL = 5 V
320
RT = 47 kΩ
310
300
290
280
270
260
250
240
0
5
10
15
20
25
Power supply voltage VCC (V)
Error amplifier threshold voltage vs.
ambient temperature (Error Amp.3)
5.0
4.0
VCC = 19 V
CTL = 5 V
3.0
2.0
1.0
0.0
−1.0
−2.0
−3.0
−4.0
−5.0
−40 −20 0
20 40 60 80 100
Ambient temperature Ta ( °C)
(Continued)
10