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IL3842N Datasheet(PDF) 2 Page - IK Semicon Co., Ltd

Part # IL3842N
Description  Fixed Frequency Current Mode PWM Controller
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Manufacturer  IKSEMICON [IK Semicon Co., Ltd]
Direct Link  http://www.iksemi.com/en/index.html
Logo IKSEMICON - IK Semicon Co., Ltd

IL3842N Datasheet(HTML) 2 Page - IK Semicon Co., Ltd

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IL3842
2011, February, Rev. 03
PIN FUNCTION DESCRIPTION
Pin
No.
Function
Description
1
Compensation
This pln is the Error Amplifier output and is made available for loop compensation
2
Voltage Feedback
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply outpul through a resistor divider.
3
Current Sense
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. Operation to 500kHz is possible.
5
GND
This pin is the combined conlrol circuitry and power ground
6
Output
This output directly drives the gate of a power MOSFET. Peak currents up to 1,0A are
sourced and sunk by this pin.
7
Vcc
This pin is the positive supply of the control IC.
8
VREF
This is the reference output. It provides chsarging current for capacitor CT through resistor
RT
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Value
Unit
Total Power Supply and Zener Current
(ICC+ IZ)
30
mA
Output Current
IO
±1.0
A
Output Energy (Capacitive Load per Cycle)
W
5.0
µJ
Error Amp Output Sink Current
IOE
10
mA
Current Sense and Voltage Feedback Inputs
Vin
-0.3 to 5.5
V
Maximum Power Dissipation @ TA= 25
oC:
DIP-8
SOP-8
PD
0.862
0.625
W
Thermal Resistance,Junction-to-Air
RθJA
145
°C/W
Operating Junction Temperature
TJ
+150
oC
Storage Temperature Range
Tstg
-65 ~ +150
oC
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.


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