Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF Download HTML

UC1848 Datasheet(PDF) 6 Page - Texas Instruments

Part No. UC1848
Description  Average Current Mode PWM Controller
Download  9 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC1848 Datasheet(HTML) 6 Page - Texas Instruments

  UC1848 Datasheet HTML 1Page - Texas Instruments UC1848 Datasheet HTML 2Page - Texas Instruments UC1848 Datasheet HTML 3Page - Texas Instruments UC1848 Datasheet HTML 4Page - Texas Instruments UC1848 Datasheet HTML 5Page - Texas Instruments UC1848 Datasheet HTML 6Page - Texas Instruments UC1848 Datasheet HTML 7Page - Texas Instruments UC1848 Datasheet HTML 8Page - Texas Instruments UC1848 Datasheet HTML 9Page - Texas Instruments  
Zoom Inzoom in Zoom Outzoom out
 6 / 9 page
background image
If the system is not sensitive to short circuit requirements,
Figure 5 shows the simplest method of downslope gener-
ation: a single resistor (ROFF = 40k) from IOFF to VREF.
The discharge current is then 100
µA. The disadvantage
to this approach is that the synthesizer continues to gen-
erate a down slope when the switch is off even during
short circuit conditions. Actual inductor down slope is
closer to zero during a short circuit. The penalty is that
the average current is understated by an amount approxi-
mately equal to the nominal inductor ripple current. Out-
put short circuit is therefore higher than the designed
maximum output current.
A third method of generating IOFF is to add a second
winding to the output inductor core (Fig. 6). When the
power switch is off and inductor current flows in the free
wheeling diode, the voltage across the inductor is equal
to the output voltage plus the diode drop. This voltage is
then transformed by the second winding to the primary
side of the converter. The advantages to this approach
are its inherent accuracy and bandwidth. Winding the
second coil on the output inductor core while maintaining
the required isolation makes this a more costly solution.
In the example, ROFF = VO / 100µA. The 4 • ROFF re-
sistor is added to compensate the one volt input level of
the IOFF pin. Without this compensation, a minor current
foldback behavior will be observed.
Figure 5: Fixed IOFF.
Figure 6: Second inductor winding generation of
Figure 4: Inductor current waveform synthesizer.

Html Pages

1  2  3  4  5  6  7  8  9 

Datasheet Download

Go To PDF Page

Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
UC1886Average Current Mode PWM Controller IC 1 2 3 4 5 MoreTexas Instruments
UC1842ACurrent Mode PWM Controller 1 2 3 4 5 MoreTexas Instruments
UCC1884Frequency Foldback Current Mode PWM Controller 1 2 3 4 5 MoreTexas Instruments
FA13844N-TE1CURRENT MODE PWM CONTROLLER 1 2 3 4 5 MoreFuji Electric
UC1843Current Mode PWM Controller 1 2 3 Texas Instruments
UC1846Current Mode PWM Controller 1 2 3 4 5 MoreTexas Instruments
AMC3842BCURRENT MODE PWM CONTROLLER 1 2 3 4 5 MoreList of Unclassifed Manufacturers
UC1826Secondary Side Average Current Mode Controller 1 2 3 4 5 MoreTexas Instruments
HV9605High Voltage Current Mode PWM Controller for ISDN Equipment 1 2 3 4 5 Supertex, Inc

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn