ncp1396 ON Semiconductor, ncp1396 Datasheet - Page 16

• Manufacturer Part Number: ncp1396
• Description: High Performance Resonant Mode Controller With High And Low Sides Drivers
• Manufacturer: ON Semiconductor

2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
Figure 36. Minimum Switching Frequency Resistor
Figure 37. Minimum Switching Frequency Resistor
500
450
400
350
300
250
200
150
100
100
900
800
700
600
500
400
300
200
100
90
80
70
60
50
40
30
20
1
10
3.5
Figure 38. Dead-Time Resistor Selection
Selection (Fmin = 100 kHz to 500 kHz)
Selection (Fmin = 20 kHz to 100 kHz)
13.5
15
3
20
23.5
25
RFmin (kW)
RFmin (kW)
33.5
Rdt (kW)
5
30
43.5
35
7
53.5
40
63.5 73.5 83.5
Vcc = 12 V
FB = 1 V
DT = 300 ns
Vcc = 12 V
FB = 1 V
DT = 300 ns
45
Vcc = 12 V
NCP1396A, NCP1396B
9
50
http://onsemi.com
11
55
16
ORing Capability
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.
Dead-time Control
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.
If for any particular reason, there is a need for a
Dead-time control is an absolute necessity when the
Figure 39. Thanks to the FB Configuration, Loop
In1
In2
ORing is Easy to Implement
V
CC
FB
20 k
VCO