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參數(shù)資料
| 型號： | AS3845D14T |
| 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)： | 17/20頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AS3845D14T |
17
ASTEC Semiconductor
The current sense comparators inverting input is
internally clamped to a level of 1.0 V to provide a
current limit (or power limit for multiple output
supplies) function. The value of R
S
is selected to
produce 1.0 V at the maximum allowed current.
For example, if 1.5 A is the maximum allowed
peak inductor current, then R
S
is selected to
equal 1 V/1.5 A = 0.66 . In high power applica-
tions, power dissipation in the current sense
resistor may become intolerable. In such a case,
a current transformer can be used to step down
the current seen by the sense resistor. See
Figure 21.
1.6 Output (OUT)
The output stage of the AS3842 is a high current
totem-pole configuration that is well suited for
directly driving power MOSFETs. It is capable of
sourcing and sinking up to 1 A of peak current.
Cross conduction losses in the output stage have
been minimized resulting in lower power dissipa-
tion in the device. This is particularly important
for high frequency operation. During under-
voltage shutdown conditions, the output is active
low. This eliminates the need for an external pull-
down resistor.
1.7 Over-temperature shutdown
The AS3842 has a built-in over-temperature
shutdown which will limit the die temperature to
130C typically. When the over-temperature con-
dition is reached, the oscillator is disabled. All
other circuit blocks remain operational. There-
fore, when the oscillator stops running, output
pulses terminate without losing control of the
supply or losing any peripheral functions that
may be running off the 5 V regulator. The output
may go high during the final cycle, but the PWM
AS384x
Current Mode Controller
D
+
D
+
FF
S
R
5 V REG
2R
R
R
S
COMP
AS3842/3/4/5
ERROR AMP
2.5 V
V
FB
1 V
1
2
3
RT/CT
4
V
S
R
C
Leading Edge Filter
CLOCK
PWM
COMPARATOR
V
E
V
REG
V
CC
OUTPUT
8
7
6
5
GND
CURRENT
SENSE
CLOCK
OUTPUT
V
E
V
S
I
S
PRI
SEC
V
IN
PWM LOGIC
Figure 20. Current Sense/PWM Latch Circuit and Waveforms
R
S
V
S
= I
R
S
N
I
S
V
S
N:1
S
Figure 21. Optional Current Transformer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS3845D813 | Current Mode Controller |
| AS3845D8T | Current Mode Controller |
| AS3845N13 | Current Mode Controller |
| AS3845NT | Current Mode Controller |
| AS384X | Current Mode Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS3845D813 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode Controller |
| 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 |
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