MB3769A Datasheet, PDF (21/26 Pages) Fujitsu Component Limited. – SWITCHING REGULATOR CONTROLLER

MB3769A
s TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 29 -Oscillator Frequency vs. RT, CT
700
500
CT = 100 pF
400
300
200
CT = 680 pF
CT = 220 pF
Fig. 30 -“H”, “L” level Output Voltage vs.
Oscillator Frequency
4
3
VCC = 15 V
TA = 25 °C
VH
VH
VL
2
VL
1
100
90
80
70 ^{CT = 1000 pF}
60
50
40
30
CT = 2200 pF
20
7 8 9 10
20 30
RT (kΩ)
40 50 60 70
Fig. 31 -Duty Cycle vs. Dead Time Control
Voltage
100
VCC = 15 V
fOSC = 200 kHz
80
CT = 1000 pF
TA = 25 °C
fOSC = 500 kHz
60
40
20
0
0
1
2
3
4
5
Dead Time Control Voltage VDTC (V)
0
20 k
50 k 100 k 200 k 500 k 1 M
Frequency fOSC (Hz)
Fig. 32 -Oscillator Frequency vs. Temp.
VCC = 15 V
4
100 kHz
2
300 kHz
0
500 kHz
-2
Target
fOSC = 100 kHz
-4
±2 % typ.
-30
0
25
50
85
Temp. TA (°C)
Fig. 33 -Dead Time Control Voltage vs.
Current(Standby Mode)
5.0
VCC = 7 V
4.0 ^{TA = 25 °C}
3.0
2.0
1.0
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
Dead Time Control Current IDTC (mA)
21