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UC3846N Datasheet(PDF) 9 Page - Texas Instruments

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Part No. UC3846N
Description  Current Mode PWM Controller
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

UC3846N Datasheet(HTML) 9 Page - Texas Instruments

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OSC
T
T
2.2
f
R C
A small RC filter may be required in some applications to reduce switch transients.
Differential input allows remote, noise free sensing.
UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
www.ti.com
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
Feature Description (continued)
Figure 3. Current Sense Amplifier Connection
7.3.2 Oscillator
By implementing the oscillator using all NPN transistors, the UCx846/7 achieves excellent temperature stability
and waveform clarity at frequencies in excess of 1 MHz.
Referring to Figure 4, an external resistor RT is used to generate a constant current into a capacitor CT to
produce a linear sawtooth waveform. Oscillator frequency may be approximated by selecting RT and CT such
that:
(1)
Figure 4. Oscillator Circuit
Copyright © 1997–2015, Texas Instruments Incorporated
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Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847


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