NCP1396B 查看數據表（PDF） - ON Semiconductor
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NCP1396B Datasheet PDF : 25 Pages
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NCP1396A, NCP1396B
500
450
VCC = 12 V
FB = 1 V
400
DT = 300 ns
350
300
250
200
150
100
1
3
5
7
9
11
RFmin (kΩ)
Figure 36. Minimum Switching Frequency Resistor
Selection (Fmin = 100 kHz to 500 kHz)
100
90
VCC = 12 V
FB = 1 V
80
DT = 300 ns
70
60
50
40
30
20
10 15 20 25 30 35 40 45 50 55
RFmin (kΩ)
Figure 37. Minimum Switching Frequency Resistor
Selection (Fmin = 20 kHz to 100 kHz)
ORing Capability
If for any particular reason, there is a need for a
frequency variation linked to an event appearance (instead
of abruptly stopping pulses), then the FB pin lends itself
very well to the addition of other sweeping loops. Several
diodes can easily be used perform the job in case of reaction
to a fault event or to regulate on the output current (CC
operation). Figure 39 shows how to do it.
VCC
In1
FB
VCO
In2
20 k
Figure 39. Thanks to the FB Configuration, Loop
ORing is Easy to Implement
Dead--time Control
Dead- time control is an absolute necessity when the
half- bridge configuration comes to play. The dead- time
technique consists in inserting a period during which both
high and low side switches are off. Of course, the
dead- time amount differs depending on the switching
frequency, hence the ability to adjust it on this controller.
The option ranges between 100 ns and 2 ms. The dead- time
is actually made by controlling the oscillator discharge
current. Figure 40 portrays a simplified VCO circuit based
on Figure 31.
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
3.5 13.5 23.5
Vcc = 12 V
33.5 43.5 53.5 63.5 73.5 83.5
Rdt (kΩ)
Figure 38. Dead--Time Resistor Selection
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