データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

UC1825A-SP データシート(PDF) 7 Page - Texas Instruments

Click here to check the latest version.
部品番号 UC1825A-SP
部品情報  RAD-TOLERANT CLASS-V, HIGH-SPEED PWM CONTROLLER
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

UC1825A-SP データシート(HTML) 7 Page - Texas Instruments

Back Button UC1825A-SP Datasheet HTML 3Page - Texas Instruments UC1825A-SP Datasheet HTML 4Page - Texas Instruments UC1825A-SP Datasheet HTML 5Page - Texas Instruments UC1825A-SP Datasheet HTML 6Page - Texas Instruments UC1825A-SP Datasheet HTML 7Page - Texas Instruments UC1825A-SP Datasheet HTML 8Page - Texas Instruments UC1825A-SP Datasheet HTML 9Page - Texas Instruments UC1825A-SP Datasheet HTML 10Page - Texas Instruments UC1825A-SP Datasheet HTML 11Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
LEADING EDGE BLANKING
t
LEB + 0.5
R
ø 10 kW
C
(2)
UDG-95105
UVLO, SOFT-START AND FAULT MANAGEMENT
UC1825A-SP
www.ti.com ..................................................................................................................................................... SLUS873A – JANUARY 2009 – REVISED APRIL 2009
The UC1825A performs fixed frequency pulse width modulation control. The UC1825A 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 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 k
Ω with a tolerance of 2.4%. The design equation is:
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.
Figure 4. Leading Edge Blanking Operational Waveforms
Soft-start is programmed by a capacitor on the SS pin. At power up, SS is discharged. When SS is low, the error
amplifier output is also forced low. While the internal 9-
µA source charges the SS pin, the error amplifier output
follows until closed loop regulation takes over.
Copyright © 2009, Texas Instruments Incorporated
Submit Documentation Feedback
7
Product Folder Link(s): UC1825A-SP


同様の部品番号 - UC1825A-SP

メーカー部品番号データシート部品情報
logo
Texas Instruments
UC1825A-SP TI1-UC1825A-SP Datasheet
831Kb / 40P
[Old version datasheet]   Class-V, Radiation Hardened High-Speed PWM Controller
UC1825A-SPRHA TI1-UC1825A-SPRHA Datasheet
831Kb / 40P
[Old version datasheet]   Class-V, Radiation Hardened High-Speed PWM Controller
UC1825A-SP TI1-UC1825A-SP_15 Datasheet
707Kb / 39P
[Old version datasheet]   Rad-Tolerant Class-V, High-Speed PWM Controller
UC1825A-SP TI1-UC1825A-SP_16 Datasheet
831Kb / 40P
[Old version datasheet]   Class-V, Radiation Hardened High-Speed PWM Controller
More results

同様の説明 - UC1825A-SP

メーカー部品番号データシート部品情報
logo
Texas Instruments
UC1825-SP TI-UC1825-SP_15 Datasheet
264Kb / 18P
[Old version datasheet]   RAD-TOLERANT CLASS V, HIGH-SPEED PWM CONTROLLER
UC1825A-SP TI1-UC1825A-SP_15 Datasheet
707Kb / 39P
[Old version datasheet]   Rad-Tolerant Class-V, High-Speed PWM Controller
UC1825A-DIE TI-UC1825A-DIE_15 Datasheet
153Kb / 5P
[Old version datasheet]   RAD-TOLERANT, HIGH-SPEED PWM CONTROLLER
UC1825-DIE TI-UC1825-DIE_15 Datasheet
120Kb / 5P
[Old version datasheet]   RAD-TOLERANT, HIGH-SPEED PWM CONTROLLER
UC1846-SP TI1-UC1846-SP Datasheet
631Kb / 15P
[Old version datasheet]   RAD-TOLERANT CLASS-V, CURRENT-MODE PWM CONTROLLER
UC19432-SP TI-UC19432-SP_15 Datasheet
755Kb / 8P
[Old version datasheet]   Rad-Tolerant Class-V, Precision Analog Controller
UC19432-SP TI1-UC19432-SP Datasheet
770Kb / 8P
[Old version datasheet]   Rad-Tolerant Class-V, Precision Analog Controller
UC1875-SP TI1-UC1875-SP_15 Datasheet
791Kb / 36P
[Old version datasheet]   Rad-Tolerant Class-V, Phase Shift Resonant Controller
UC1625-SP TI1-UC1625-SP Datasheet
304Kb / 21P
[Old version datasheet]   RAD-TOLERANT CLASS V, BRUSHLESS DC MOTOR CONTROLLER
UC1875-SP TI1-UC1875-SP Datasheet
548Kb / 20P
[Old version datasheet]   RAD-TOLERANT CLASS-V, PHASE SHIFT RESONANT CONTROLLER
More results


Html Pages

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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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