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UC2843B Arkusz danych(PDF) 2 Page - Unisonic Technologies

Numer części UC2843B
Szczegółowy opis  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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Producent  UTC [Unisonic Technologies]
Strona internetowa  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC2843B Arkusz danych(HTML) 2 Page - Unisonic Technologies

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UC2843B
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
2 of 8
www.unisonic.com.tw
QW-R103-048.D
PIN CONFIGURATION
VREF
8
7
6
5
1
2
3
4
RT/CT
COMP
VFB
ISENSE
VCC
OUTPUT
GND
PIN DESCRIPTION
PIN NO.
PIN NAME
DESCRIPTION
1
COMP
This pin is the Error Amplifier output and is made available 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. Operation to 500 kHz is
possible.
5
GND
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 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 charging current for capacitor CT through
resistor RT.
BLOCK DIAGRAM


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