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UC3846N Datasheet(PDF) 12 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) 12 Page - Texas Instruments

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T
T
2.2
fT (kHz)
R (k ) C ( F)
|
: u
P
T
ID
Td( s)
145 C ( F)
3.6
ID
RT (k )
ª
º
«
»
P
P «
»
«
»
«
»
:
¬
¼
UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
www.ti.com
8.2.2 Detailed Design Procedure
This section details the design procedure based on the design requirements.
8.2.2.1 Design Switching Frequency
Output deadtime is determined by the external capacitor, CT, according to the formula:
where
ID = Oscillator discharge current at 25°C; typically is 7.5.
(2)
For large values of RT: τd (μs ) ≈145CT (μF).
Oscillator frequency is approximated by the formula:
(3)
8.2.2.2 Error Amplifier Output Configuration
Figure 6. Error Amplifier Output Configuration
12
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Copyright © 1997–2015, Texas Instruments Incorporated
Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847


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