Texas Instruments Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller Evaluation Module LM2743EVAL/NOPB LM2743EVAL/NOPB Datenbogen
Produktcode
LM2743EVAL/NOPB
HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ
SS/TRACK
EAO
PGND
V
C
C
C
V
IN
V
OUT
R6
C8
R3
R4
C7
R2
C5
D2
C10
Q2
C12
L1
+
C9
R7
C15
LM2743
R5
C11
R8
+
C16
C14
D1
R11
J1
Q1
C13
R1
SGND
Performance Characteristics
Table 1. Bill of Materials
Designator
Function
Part Description
Part Number
U1
Controller
IC LM2743 TSSOP14
Texas Instruments
C5
VCC Decoupling
Cer Cap 1µF 25V 10% 0805
Murata GRM216R61E105KA12B
C7
Soft Start Cap
Cer Cap 12nF 25V 10% 0805
Vishay VJ0805Y123KXX
C8
Comp Cap
Cer Cap 1.5nF 25V 10% 0805
Vishay VJ0805Y152KXX
C9
Comp Cap
Cer Cap 18pF 25V 10% 0805
Vishay VJ0805A180KAA
C10
Cboot
Cer Cap 0.1µF 25V 10% 0805
Vishay VJ0805Y104KXX
C11
Comp Cap
Cer Cap 1.8nF 25V 10% 0805
Vishay VJ0805Y182KXX
C12
Input Filter Cap
Cer Cap 10uF 25V 10% 1210
AVX 12103D106MAT
C14
Input Filter Cap
Cer Cap 10uF 25V 10% 1210
AVX 12103D106MAT
C15
Output Filter Cap
470µF, 6.3V, 10m
Ω
ESR POScap
Sanyo 6TPD470
R1
Filter Resistor
Res 10
Ω
.25W 0805
Vishay CRCW08051000F
R2
Frequency Adjust Res
Res 24.9K
Ω
.25W 0805
Vishay CRCW08052492F
R3
Comp Res
Res 17.4K
Ω
.25W 0805
Vishay CRCW08051742F
R4
Current Limit Res
Res 3.16K
Ω
.25W 0805
Vishay CRCW08053161F
R5
Comp Res
Res 2.94K
Ω
.25W 0805
Vishay CRCW08052941F
R6
Res Divider, upper
Res 10.0K
Ω
.25W 0805
Vishay CRCW08051002F
R7
Res Divider, lower
Res 10.0K
Ω
.25W 0805
Vishay CRCW08051002F
R8
PWGD Pull-Up
Res 100K
Ω
.25W 0805
Vishay CRCW08051003F
R11
Shut Down Pull-Up
Res 100K
Ω
.25W 0805
Vishay CRCW080561003F
D2
Bootstrap Diode
Schottky Diode, SOD-123
MBR0530LTI
L1
Output Filter Inductor
Inductor 1µH, 5.3Arms, 10.2m
Ω
Cooper DR73-1R0
Q1-Q2
Top and Bottom FETs
Dual N-MOSFET, V
DS
= 20V, 24m
Ω
@ 2.5V
Vishay 9926BDY
Figure 6. Complete Demo Board Schematic
4
AN —1356 LM2743 Evaluation Board
SNVA102A – October 2005 – Revised April 2013
Copyright © 2005–2013, Texas Instruments Incorporated