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KA3842 Arkusz danych(PDF) 3 Page - Estek Electronics Co. Ltd

Numer części KA3842
Szczegółowy opis  fixed frequency current mode PWM controller
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Producent  ESTEK [Estek Electronics Co. Ltd]
Strona internetowa  http://www.estek.com.cn/en/index.asp
Logo ESTEK - Estek Electronics Co. Ltd

KA3842 Arkusz danych(HTML) 3 Page - Estek Electronics Co. Ltd

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Pin functions
N
Function
Description
1
COMP
This pin is the Error Amplifier output and is made for loop compensation.
2
VFB
This is the inverting input of the Error Amplifier. It is normall y connected to the switching power supply
output through a resistor divider.
3
ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses this information to
terminate the output switch conduction.
4
RT/CT
The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref
and capacitor CT to ground.
5
GROUND
This pin is the combined control circuitry and power ground.
6
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sink by
this pin.
7
VCC
This pin is the positive supply of the integrated circuit.
8
Vref
This is the reference output. It provides charging current for capacitor C T through resistor RT .
Application information
2.5V
1mA
V
FB
2
COMP
1
Figure 1. Error Amp Configuration
VCC
7
ON/OFF COMMAND TO S/R OF IC
ICC
MIK3842 MIK3843
MIK3844 MIK3845
13mA
VON
VOFF
16V
10V
8.4V
7.6V
0.2mA
VOFF
VON
VCC
During UVLO, the Output is low
Figure 2. Undervoltage Lockout
IS
R
VFB
COMP
CURRENT
SENSE
+
2
_
1
3
ERROR
AMP
2R
R
1V
CURRENT
SENSE
COMPARATOR
RS
C
GND
5
Peak current is determined by
IS max
1.0V
RS
Figure 3. Current Sense Circuit
3
BEIJING ESTEK ELECTRONICS CO.,LTD


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