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UC3842A-BW Datasheet(PDF) 3 Page - First Components International

No. de pieza UC3842A-BW
Descripción Electrónicos  Current Mode PWM Controller Low Start-Up and Operating Current
Download  10 Pages
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Fabricante Electrónico  FCI [First Components International]
Página de inicio  http://www.cotra.com.tw/
Logo FCI - First Components International

UC3842A-BW Datasheet(HTML) 3 Page - First Components International

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3
PIN FUNCTION
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 normally 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 CT through
resistor RT .
APPLICATION INFORMATION
Figure 1. Error Amp Configuration
Figure 2. Undervoltage Lockout
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
UC384XA-BW Current Mode PWM Controller


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