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UC2845 Datasheet(PDF) 2 Page - Unisonic Technologies

Part # UC2845
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC2845 Datasheet(HTML) 2 Page - Unisonic Technologies

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UC2844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
2 of 7
www.unisonic.com.tw
QW-R103-051.B
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO
PIN NAME
FUNCTION
1
Compensation Error amplifier output, this pin is made available for loop compensation.
2
VFB
Voltage Feedback, 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 1 MHz is possible.
5
GND
Power ground.
6
Output
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are
sourced and sunk by this pin. The output switches at one-half the oscillator frequency.
7
VCC
Positive supply.
8
VREF
Reference output, provides charging current for capacitor CT though resistor RT.


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