công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

UC1846-SP bảng dữ liệu(PDF) 10 Page - Texas Instruments

tên linh kiện UC1846-SP
Giải thích chi tiết về linh kiện  Class-V, Radiation Hardened PWM Controller
Download  29 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
Logo TI1 - Texas Instruments

UC1846-SP bảng dữ liệu(HTML) 10 Page - Texas Instruments

Back Button UC1846-SP_16 Datasheet HTML 6Page - Texas Instruments UC1846-SP_16 Datasheet HTML 7Page - Texas Instruments UC1846-SP_16 Datasheet HTML 8Page - Texas Instruments UC1846-SP_16 Datasheet HTML 9Page - Texas Instruments UC1846-SP_16 Datasheet HTML 10Page - Texas Instruments UC1846-SP_16 Datasheet HTML 11Page - Texas Instruments UC1846-SP_16 Datasheet HTML 12Page - Texas Instruments UC1846-SP_16 Datasheet HTML 13Page - Texas Instruments UC1846-SP_16 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 29 page
background image
Ip
D2
L1
V
O
D1
Current
Mode
Control
PWM
I
SENSE
8
V
SENSE
V
IN
Q
1
Q
2
Np
Np
R
S
+
N
S
N
S
I
S
C1
+
10
UC1846-SP
SLUS871D – JANUARY 2009 – REVISED DECEMBER 2016
www.ti.com
Product Folder Links: UC1846-SP
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
Feature Description (continued)
The peak method of inductor current control functions by comparing the upslope of inductor current (or switch
current) to a current program level set by the outer loop. The comparator turns the power switch off when the
instantaneous current reaches the desired level. The current ramp is usually quite small compared to the
programming level, especially when VIN is low. As a result, this method is extremely susceptible to noise. A noise
spike is generated each time the switch turns on. A fraction of a volt coupled into the control circuit can cause it
to turn off immediately, resulting in a sub-harmonic operating mode with much greater ripple. Circuit layout and
bypassing are critically important to successful operation.
The peak current mode control method is inherently unstable at duty ratios exceeding 0.5, resulting in sub-
harmonic oscillation. A compensating ramp (with slope equal to the inductor current downslope) is usually
applied to the comparator input to eliminate this instability. A slope compensation must be added to the sensed
current waveform or subtracted from the control voltage to ensure stability above a 50% duty cycle. A
compensating ramp (with slope equal to the inductor current downslope) is usually applied to the comparator
input to eliminate this instability.
The pulse width modulator (PWM) of UC1846-SP is limited to a maximum duty cycle of 50%, thus it can be used
in topologies such as push-pull, half bridge, full bridge, forward, flyback configurations. Limiting PWM to 50%
duty cycle ensures that for isolated or transformer based topologies. The transformer is allowed to reset and
prevent saturation of the transformer core.
Pulse-by-pulse symmetry correction (flux balancing) is inherent to current mode controllers and essential for the
push-pull topology to prevent core saturation.
Current limit control design has numerous advantages:
1. Current mode control provided peak switch current limiting – pulse by pulse current limit.
2. Control loop is simplified as one pole due to output inductor is pushed to higher frequency , thus a two pole
system turns into two real poles. Thus system reduces to a first order system thus simplifies the control.
3. Multiple converter can be paralleled and allows equal current sharing amount the various converters.
4. Inherently provides for input voltage feed-forward as any perturbation in the input voltage will be reflected in
the switch or inductor current. Since switch or inductor current is a direct control input, thus this perturbation
is very rapidly corrected.
5. The error amplifier output (outer control loop) defines the level at which the primary current (inner loop) will
regulate the pulse width, and output voltage.
Figure 3. Push-Pull Converter Using Current Mode Control
7.3.1 Reference
As highlighted in the Functional Block Diagram, UC1846-SP incorporates a 5.1-V internal reference regulator
with ±10% set point variation over temperature.


Số phần tương tự - UC1846-SP_16

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
UC1846-SP TI1-UC1846-SP_15 Datasheet
630Kb / 29P
[Old version datasheet]   Current-Mode PWM Controller
More results

Mô tả tương tự - UC1846-SP_16

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Texas Instruments
UC1825A-SP TI1-UC1825A-SP_16 Datasheet
831Kb / 40P
[Old version datasheet]   Class-V, Radiation Hardened High-Speed PWM Controller
UC1825B-SP TI1-UC1825B-SP Datasheet
4Mb / 30P
[Old version datasheet]   Class-V, Radiation Hardened High-Speed PWM Controller
UC1845A-SP TI1-UC1845A-SP Datasheet
938Kb / 28P
[Old version datasheet]   QML Class V, Radiation Hardened Current-Mode PWM Controller
UC1843B-SP TI1-UC1843B-SP Datasheet
3Mb / 27P
[Old version datasheet]   QML Class V, Radiation Hardened Current-Mode PWM Controller
UC1825B-SP TI-UC1825B-SP_V01 Datasheet
4Mb / 31P
[Old version datasheet]   UC1825B-SP Class-V, Radiation Hardened High-Speed PWM Controller
UC1825B-SP TI-UC1825B-SP_V02 Datasheet
4Mb / 31P
[Old version datasheet]   UC1825B-SP Class-V, Radiation Hardened High-Speed PWM Controller
UC1845A-SP TI-UC1845A-SP_15 Datasheet
874Kb / 28P
[Old version datasheet]   UC1845A-SP QML Class V, Radiation Hardened Current-Mode PWM Controller
UC1843B-SP TI-UC1843B-SP_V01 Datasheet
3Mb / 27P
[Old version datasheet]   UC1843B-SP QML Class V, Radiation Hardened Current-Mode PWM Controller
UC1843B-SP TI-UC1843B-SP_V02 Datasheet
3Mb / 31P
[Old version datasheet]   UC1843B-SP QML Class V, Radiation Hardened Current-Mode PWM Controller
logo
Renesas Technology Corp
ISL73847SEH RENESAS-ISL73847SEH Datasheet
1Mb / 43P
   Radiation Hardened Single/Dual Phase Current Mode PWM Controller
Feb 15, 2023
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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