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參數(shù)資料
| 型號(hào)： | AS3845D813 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Current Mode Controller |
| 中文描述： | 電流模式控制器 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AS3845D813 |
18
ASTEC Semiconductor
latch is still fully operative, and the normal termi-
nation of this cycle by the current sense com-
parator will latch the output low until the
over-temperature condition is rectified. Cycling
the power will reset the over-temperature disable
mechanism, or the chip will re-start after cooling
through a nominal hysteresis band.
Section 2 D Design Considerations
2.1 Leading edge filter
The current sensed by R
S
contains a leading
edge spike as shown in Figure 20. This spike is
caused by parasitic elements within the circuit
including the interwinding capacitance of the
power transformer and the recovery characteris-
tics of the rectifier diode(s). The spike, if not prop-
erly filtered, can cause stability problems by
prematurely terminating the output pulse.
A simple RC filter is used to suppress the spike.
The time constant should be chosen such that it
approximately equals the duration of the spike. A
good choice for R
1
is 1 k, as this value is opti-
mum for the filter and at the same time, it simpli-
fies the determination of R
SLOPE
(Section 2.2). If
the duration of the spike is, for example, 100 ns,
then C is determined by:
(6)
2.2 Slope compensation
Current-mode controlled converters can experi-
ence instabilities or subharmonic oscillations
AS384x
Current Mode Controller
T
0
D
1
D
2
T
1
I
PK
V
e
I
L
2
I
L
1
I
AVG 2
I
AVG 1
m
1
m
2
(a)
T
0
D
1
D
2
T
1
V
e
I
m
1
m
2
(b)
I'
T
0
D
1
D
2
T
1
V
COMP
I
L
2
I
L
1
I
AVG 1
= I
AVG 2
m
1
m
2
(c)
m= m
2
/2
T
0
D
1
D
2
T
1
I
m
1
m
2
(d)
I'
V
COMP
m= m
2
/2
Figure 22. Slope Compensation
C
=
=
=
Time Constant
k
ns
k
pF
1
100
1
100
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS3845D8T | Current Mode Controller |
| AS3845N13 | Current Mode Controller |
| AS3845NT | Current Mode Controller |
| AS384X | Current Mode Controller |
| AS3842D1413 | Current Mode Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS3845D8T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3845N13 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS3845NT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| AS384R5FLF | 制造商:TT Electronics / IRC 功能描述:AS384R5FLF |
| AS384X | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
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