Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

Preview PDF HTML

LM5145 Datasheet(PDF) 39 Page - Texas Instruments

Click here to check the latest version.
Part # LM5145
Description  LM25143 3.5-V to 42-V Dual Synchronous Buck DC/DC Controller With Ultra-Low IQ
PDF  69 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5145 Datasheet(HTML) 39 Page - Texas Instruments

Back Button LM5145 Datasheet HTML 35Page - Texas Instruments LM5145 Datasheet HTML 36Page - Texas Instruments LM5145 Datasheet HTML 37Page - Texas Instruments LM5145 Datasheet HTML 38Page - Texas Instruments LM5145 Datasheet HTML 39Page - Texas Instruments LM5145 Datasheet HTML 40Page - Texas Instruments LM5145 Datasheet HTML 41Page - Texas Instruments LM5145 Datasheet HTML 42Page - Texas Instruments LM5145 Datasheet HTML 43Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 39 / 69 page
background image
10.1.2 Error Amplifier and Compensation
Figure 10-3 shows a Type-II compensator using a transconductance error amplifier (EA). The dominant pole of
the EA open-loop gain is set by the EA output resistance, RO-EA, and effective bandwidth-limiting capacitance,
CBW, as shown in Equation 28.
O-EA
EA(openloop)
O-EA
BW
g
R
G
(s)
1 s R
C
˜
˜
˜
m
(28)
The EA high-frequency pole is neglected in Equation 28. The compensator transfer function from output voltage
to COMP node, including the gain contribution from the (internal or external) feedback resistor network, is
calculated in Equation 29.
m
O-EA
1
c
REF
c
out
OUT
p1
p2
s
g
R
1
Öv (s)
V
G (s)
Öv
(s)
V
s
s
1
1
Z
Z
Z
§
·
˜
˜ ¨
¸
©
¹
˜
§
· §
·
˜
¨
¸ ¨
¸
¨
¸ ¨
¸
©
¹ ©
¹
z
(29)
where
• VREF is the feedback voltage reference of 0.6 V.
• gm is the EA gain transconductance of 1200 µS.
• RO-EA is the error amplifier output impedance of 64 MΩ.
Z1
COMP
COMP
1
R
C
Z
˜
(30)
p1
O-EA
COMP
HF
BW
O-EA
COMP
1
1
R
C
C
C
R
C
Z
#
˜
˜
(31)
p2
COMP
HF
COMP
COMP
HF
BW
1
1
R
C
R
C
C
C
Z
#
˜
˜
(32)
The EA compensation components create a pole close to the origin, a zero, and a high-frequency pole. Typically,
RCOMP << RO-EA and CCOMP >> CBW and CHF, so the approximations are valid.
Error amplifier model
VREF
COMP
FB
CHF
CBW
RO-EA
–
+
z1
p2
p1
RFB1
VOUT
gm
RFB2
CCOMP
RCOMP
AGND
Figure 10-3. Error Amplifier and Compensation Network
www.ti.com
LM25143
SNVSC10 – MARCH 2022
Copyright © 2022 Texas Instruments Incorporated
Submit Document Feedback
39
Product Folder Links: LM25143



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 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com