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UC3844 数据表(PDF) 2 Page - E-Tech Electronics LTD

部件名 UC3844
功能描述  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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制造商  ETL [E-Tech Electronics LTD]
网页  http://e-tech.com.hk
标志 ETL - E-Tech Electronics LTD

UC3844 数据表(HTML) 2 Page - E-Tech Electronics LTD

  UC3844_45 Datasheet HTML 1Page - E-Tech Electronics LTD UC3844_45 Datasheet HTML 2Page - E-Tech Electronics LTD UC3844_45 Datasheet HTML 3Page - E-Tech Electronics LTD UC3844_45 Datasheet HTML 4Page - E-Tech Electronics LTD UC3844_45 Datasheet HTML 5Page - E-Tech Electronics LTD UC3844_45 Datasheet HTML 6Page - E-Tech Electronics LTD  
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UC3844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
2 of 6
www.unisonic.com.tw
QW-R103-010.E
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.
BLOCK DIAGRAM


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