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參數(shù)資料
| 型號(hào)： | AS2843 |
| 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(yè)數(shù)： | 17/20頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | AS2843 |
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ASTEC Semiconductor
Current Mode Controller
AS2842/3/4/5
53
Figure 21.
Optional Current Transformer
The current sense comparator’s 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 AS2842 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 undervoltage
shutdown conditions, the output is active low.
This eliminates the need for an external pulldown
resistor.
1.7 Over-temperature shutdown
The AS2842 has a built-in over-temperature
shutdown which will limit the die temperature to
130
°
C typically. When the over-temperature
condition 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
Figure 20.
Current Sense/PWN Latch Circuit and Waveforms
V
S
= I
S
N
S
R
S
V
S
N:1
I
S
–
+
–
+
FF
S
R
5 V REG
2R
R
R
S
COMP
AS2842/3/4/5
ERROR AMP
2.5 V
V
FB
1 V
1
2
3
RT/CT
4
V
S
R
C
Leadong 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
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