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KA3843AM Datasheet(PDF) 3 Page - Wing Shing Computer Components

No. de pieza KA3843AM
Descripción Electrónicos  Current���� Mode��PWM��Cont roller
Download  9 Pages
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Fabricante Electrónico  WINGS [Wing Shing Computer Components]
Página de inicio  http://www.wingshing.com/en
Logo WINGS - Wing Shing Computer Components

KA3843AM Datasheet(HTML) 3 Page - Wing Shing Computer Components

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Current Mode PWM Controller
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
KA3843A(AM)
WS
WS


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