Datasheet

HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ
SS/TRACK
EAO
PGND
V
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 www.ti.com
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, 10mΩ ESR POScap Sanyo 6TPD470
R1 Filter Resistor Res 10Ω .25W 0805 Vishay CRCW08051000F
R2 Frequency Adjust Res Res 24.9KΩ .25W 0805 Vishay CRCW08052492F
R3 Comp Res Res 17.4KΩ .25W 0805 Vishay CRCW08051742F
R4 Current Limit Res Res 3.16KΩ .25W 0805 Vishay CRCW08053161F
R5 Comp Res Res 2.94KΩ .25W 0805 Vishay CRCW08052941F
R6 Res Divider, upper Res 10.0KΩ .25W 0805 Vishay CRCW08051002F
R7 Res Divider, lower Res 10.0KΩ .25W 0805 Vishay CRCW08051002F
R8 PWGD Pull-Up Res 100KΩ .25W 0805 Vishay CRCW08051003F
R11 Shut Down Pull-Up Res 100KΩ .25W 0805 Vishay CRCW080561003F
D2 Bootstrap Diode Schottky Diode, SOD-123 MBR0530LTI
L1 Output Filter Inductor Inductor 1µH, 5.3Arms, 10.2mΩ Cooper DR73-1R0
Q1-Q2 Top and Bottom FETs Dual N-MOSFET, V
DS
= 20V, 24mΩ @ 2.5V Vishay 9926BDY
Figure 6. Complete Demo Board Schematic
4
AN —1356 LM2743 Evaluation Board SNVA102A–October 2005–Revised April 2013
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