Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

UC2825AN Folha de dados(PDF) 7 Page - Texas Instruments

Click here to check the latest version.
Nome de Peças UC2825AN
Descrição Electrónicos  HIGH-SPEED PWM CONTROLLER
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

UC2825AN Folha de dados(HTML) 7 Page - Texas Instruments

Back Button UC2825AN Datasheet HTML 3Page - Texas Instruments UC2825AN Datasheet HTML 4Page - Texas Instruments UC2825AN Datasheet HTML 5Page - Texas Instruments UC2825AN Datasheet HTML 6Page - Texas Instruments UC2825AN Datasheet HTML 7Page - Texas Instruments UC2825AN Datasheet HTML 8Page - Texas Instruments UC2825AN Datasheet HTML 9Page - Texas Instruments UC2825AN Datasheet HTML 10Page - Texas Instruments UC2825AN Datasheet HTML 11Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 18 page
background image
UC1823A,UC2823A, UC2823B,
UC3823A,UC3823B,UC1825A,
UC2825A,UC2825B,UC3825A,UC3825B
SLUS334D − AUGUST 1995 − REVISED NOVEMBER 2008
www.ti.com
7
LEADING EDGE BLANKING
The UC3823A, UC2823B, UC3825A, and UC3825B perform fixed frequency pulse width modulation control. The
UC3823A, and UC3823B outputs operate together at the switching frequency and can vary from zero to some value less
than 100%. The UC3825A and UC3825B outputs are alternately controlled. During every other cycle, one output is off.
Each output then switches at one-half the oscillator frequency, varying in duty cycle from 0 to less than 50%.
To limit maximum duty cycle, the internal clock pulse blanks both outputs low during the discharge time of the oscillator.
On the falling edge of the clock, the appropriate output(s) is driven high. The end of the pulse is controlled by the PWM
comparator, current limit comparator, or the overcurrent comparator.
Normally the PWM comparator senses a ramp crossing a control voltage (error amplifier output) and terminates the pulse.
Leading edge blanking (LEB) causes the PWM comparator to be ignored for a fixed amount of time after the start of the
pulse. This allows noise inherent with switched mode power conversion to be rejected. The PWM ramp input may not
require any filtering as result of leading edge blanking.
To program a leading edge blanking (LEB) period, connect a capacitor, C, to CLK/LEB. The discharge time set by C and
the internal 10-k
Ω resistor determines the blanked interval. The 10-kΩ resistor has a 10% tolerance. For more accuracy,
an external 2-k
Ω 1% resistor (R) can be added, resulting in an equivalent resistance of 1.66 kΩ with a tolerance of 2.4%.
The design equation is:
t
LEB + 0.5
R
ø 10 kW
C
Values of R less than 2 k
Ω should not be used.
Leading edge blanking is also applied to the current limit comparator. After LEB, if the ILIM pin exceeds the 1-V threshold,
the pulse is terminated. The overcurrent comparator, however, is not blanked. It catches catastrophic overcurrent faults
without a blanking delay. Any time the ILIM pin exceeds 1.2 V, the fault latch is set and the outputs driven low. For this
reason, some noise filtering may be required on the ILIM pin.
UDG−95105
Figure 4. Leading Edge Blanking Operational Waveforms
(2)


Nº de peça semelhante - UC2825AN

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Texas Instruments
UC2825AN TI-UC2825AN Datasheet
303Kb / 15P
[Old version datasheet]   High Speed PWM Controller
UC2825AN TI1-UC2825AN Datasheet
936Kb / 19P
[Old version datasheet]   HIGH-SPEED PWM CONTROLLER
UC2825ANG4 TI-UC2825ANG4 Datasheet
303Kb / 15P
[Old version datasheet]   High Speed PWM Controller
UC2825ANG4 TI1-UC2825ANG4 Datasheet
936Kb / 19P
[Old version datasheet]   HIGH-SPEED PWM CONTROLLER
UC2825ANRTR TI-UC2825ANRTR Datasheet
303Kb / 15P
[Old version datasheet]   High Speed PWM Controller
More results

Descrição semelhante - UC2825AN

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Texas Instruments
UC1823AJ883B TI-UC1823AJ883B Datasheet
456Kb / 9P
[Old version datasheet]   High Speed PWM Controller
UC3823N TI-UC3823N Datasheet
2Mb / 13P
[Old version datasheet]   HIGH SPEED PWM CONTROLLER
UC3824DW TI1-UC3824DW Datasheet
704Kb / 14P
[Old version datasheet]   HIGH SPEED PWM CONTROLLER
UCC3829-1 TI1-UCC3829-1 Datasheet
196Kb / 11P
[Old version datasheet]   High Speed PWM Controller
UC1823 TI-UC1823 Datasheet
409Kb / 7P
[Old version datasheet]   High Speed PWM Controller
UC1823A TI-UC1823A Datasheet
303Kb / 15P
[Old version datasheet]   High Speed PWM Controller
UC3825B TI-UC3825B Datasheet
316Kb / 9P
[Old version datasheet]   High Speed PWM Controller
UC1825 TI-UC1825 Datasheet
914Kb / 17P
[Old version datasheet]   High Speed PWM Controller
UC1825 TI1-UC1825_13 Datasheet
968Kb / 19P
[Old version datasheet]   High Speed PWM Controller
UC2825AQDW TI-UC2825AQDW Datasheet
928Kb / 19P
[Old version datasheet]   High Speed PWM Controller
UC2825A-Q1 TI-UC2825A-Q1_15 Datasheet
932Kb / 17P
[Old version datasheet]   HIGH-SPEED PWM CONTROLLER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com