LTC1871 Linear Technology, LTC1871 Datasheet - Page 22

• Manufacturer Part Number: LTC1871
• Description: Wide Input Range/ No RSENSE Current Mode Boost/ Flyback and SEPIC Controller
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
LTC1871
22
immediately adjacent to Pin 6. The ground trace on the
top layer of the PC board should be as wide and short
as possible to minimize series resistance and induc-
tance.
R2
OUTPUT SENSING
SIGNAL GROUND
VIAS TO GROUND
PLANE
PSEUDO-KELVIN
R
R
TRUE REMOTE
U
C
T
R1
CONNECTION
C
C
BOLD LINES INDICATE HIGH CURRENT PATHS
U
R3
R2
PIN 1
LTC1871
R1
R
C
C
T
R4
W
Figure 14. LTC1871 Boost Converter Suggested Layout
Figure 15. LTC1871 Boost Converter Layout Diagram
R
R3
C
C
OUT
1
2
3
4
5
C
JUMPER
VCC
GROUND CONNECTION
RUN
I
FB
FREQ
MODE/
SYNC
J1
TH
BULK C
LTC1871
R4
U
PSEUDO-KELVIN
C
C
OUT
IN
INTV
SENSE
GATE
GND
V
CC
LOW ESR CERAMIC
IN
10
9
8
7
6
2. Beware of ground loops in multiple layer PC boards. Try
to maintain one central ground node on the board and
use the input capacitor to avoid excess input ripple for
high output current power supplies. If the ground plane
J1
C
VCC
M1
D1
+
L1
C
+
IN
C
OUT
L1
M1
SWITCH
NODE
1871 F14
1871 F15
D1
V
V
V
IN
OUT
GND
V
SWITCH NODE IS ALSO
THE HEAT SPREADER
FOR L1, M1, D1
IN
OUT