參數(shù)資料
型號: NCP1395A
廠商: ON SEMICONDUCTOR
英文描述: High Performance Resonant Mode Controller(高性能諧振模式控制器)
中文描述: 高性能諧振模式控制器(高性能諧振模式控制器)
文件頁數(shù): 17/27頁
文件大?。?/td> 335K
代理商: NCP1395A
NCP1395A/B
http://onsemi.com
17
The selection of the three setting resistors (Fmax, Fmin
and deadtime) requires the usage of the selection charts
displayed below:
Figure 37. Maximum switching frequency resistor
selection depending on the adopted minimum
switching frequency.
100
300
500
700
900
20
170
RFmax (k )
320
F
120
270
70
220
370
1100
Fmin = 200 kHz
Fmin = 50 kHz
V
CC
= 11 V
FB = 6.5 V
DT = 300 ns
Figure 38. Minimum Switching Frequency Resistor
Selection
40
60
80
100
120
20
80
F
RFmin (k )
60
120
40
100
140
V
CC
= 11 V
FB = 1 V
DT = 300 ns
160
180
200
Figure 39. DeadTime Resistor Selection
0
100
200
300
400
500
0
300
600
D
Rdt (k )
200
500
100
400
600
700
800
900
1000
1100
V
CC
= 11 V
ORing Capability
If for a particular reason, there is a need for having 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 to perform the job in case of
reaction to a fault event or to regulate on the output current
(CC operation). Figure 40 shows how to do it.
V
CC
FB
In1
In2
20 k
VCO
Figure 40. Due to the FB configuration, loop ORing
is easy to implement.
相關(guān)PDF資料
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