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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)： | 4/7頁 |
| 文件大?。?/td> | 300K |
| 代理商： | S3843P |
KSI-L007-000
4
To prevent erratic output behavior which activating
the power switch with extraneous leakage currents,
during under voltage lockout. Output(pin6) should be
shunted to ground with a bleeder resister.
The Vcc comparator upper and lower threshold are
8.4
V/7.6V. The large hysteresis and low start up
Icc
currents makes it ideally suited in off-line converter
application where efficient bootstrap start-up
<17mA
techniques are required.
The oscillator frequency is programmed by the values
LARGE Rt
SMALL Ct
selected for the timing components Rt and Ct. Ct is
8
charged from 5V, Vref, through resistor Rt to
approximately 2.8V and discharged to 1.2V by an
internal current sink.
During the discharge of Ct, the oscillator generates an
5
internal blanking pulse and the center input NOR gate high.
This makes output to be in a low state and control the
INTERNAL
amount of output dead time.
3. Error AMP Configuration
2.50V
Error amp output(Pin1) is provided for external loop
compensation and error amp can source or sink up to 0.5mA.
The non-inverting input is internally biased at 2.5V and is
not pinned out. The converter output voltage is typically
divided down and monitored by the inverting input(pin2).
S3843P
Information in using IC
1. Under voltage Lockout
2. Oscillator Waveforms and Maximum Duty Cycle
1
Zf
COMP
TO RESET OF IC
ON/OFF COMMAND
V off-7.6V
V on-8.4V
7
V cc
<1mA
7.6V
8.4V
Rt
Rt
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