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參數(shù)資料
| 型號： | S3843P |
| 廠商： | AUK Corp |
| 英文描述： | Current Mode PWM Controller |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 300K |
| 代理商： | S3843P |
KSI-L007-000
5
4. Current Sense Circuit
A normal operating conditions occurs when the power supply output is overloaded or if output voltage to 1.0V
Therefore the maximum peak switch current is lpk(max)=1.0V/Rs, and under the normal operating conditions the
peak inductor current controlled by the voltage at pin1.
5. Shutdown Techniques
4.7K
Shutdown of the S3843 can be
V
REF
accomplished by two methods;
3
I
4.7K
5.00
either raise pin3 above 1V or pull
pin1 below a voltage two diodes
DOW N
drops above ground. Either causes
the output of the PWM method
comparator to be high (refer to
block diagram). The PWM latch is reset dominant so that the output will remain low until the next clock cycle after
the shutdown condition at pins 1 and/or 3 is removed. In one example, an externally latched shutdown may be
accomplished by adding an SCR which turn off, allowing the SCR to reset.
Ipeak =
R(V pin1 - 2V be)
3R x Rs
COMP
AMP
ERROR
1
3
5
COMPARATOR
GND
SENSE
Rs
R
C
2R
R
IV
CURRENT
SENSE
CURRENT
Iβ
S3843P
8
SENSE
1
COMP
SHUT
SHUT
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