MB39A123 Datasheet, PDF (14/44 Pages) Fujitsu Component Limited. – 6 ch DC/DC Converter IC with Synchronous Rectification

MB39A123
Triangular Wave Oscillation Frequency vs.
Timing Resistor
10000
Ta = + 25 °C
VCC = 4 V
CTL = 3 V
1000
100
CT = 27 pF
CT = 100 pF
CT = 680 pF CT = 220 pF
Triangular Wave Oscillation Frequency vs.
Timing Capacity
10000
Ta = + 25 °C
VCC = 4 V
CTL = 3 V
1000
100
RT = 3 kΩ
RT = 6.8 kΩ
RT = 39 kΩ RT = 13 kΩ
10
1
10
100
1000
Timing Resistor RT (kΩ)
Triangular Wave Upper and Lower Limit Voltage
vs. Triangular Wave Oscillation Frequency
1.20
Ta = + 25 °C
1.10 VCC = 4 V
CTL = 3 V
1.00 RT = 6.8 kΩ
0.90
Upper limit
0.80
0.70
0.60
0.50
0.40
Lower limit
0.30
0.20
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200
Triangular Wave Oscillation Frequency fOSC (kHz)
10
10
100
1000
10000
Timing Capacity CT (pF)
Triangular Wave Upper and Lower Limit Voltage
vs. Operating Ambient Temperature
1.20
VCC = 4 V
1.10 CTL = 3 V
RT = 6.8 kΩ
1.00 CT = 100 pF
0.90
Upper limit
0.80
0.70
0.60
0.50
0.40
Lower limit
0.30
0.20
−40 −20
0
+20 +40 +60 +80 +100
Operating Ambient Temperature Ta ( °C)
Triangular Wave Oscillation Frequency
vs. Operating Ambient Temperature
1100
1080
1060
VCC = 4 V
CTL = 3 V
RT = 6.8 kΩ
CT = 100 pF
1040
1020
1000
980
960
940
920
900
−40 −20
0
+20 +40 +60 +80 +100
Operating Ambient Temperature Ta ( °C)
14
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