Linear DC2033A Demo Manual page 7

applications
5V and the feedback voltage, V
the feedback resistors are selected using the Quick Design
Guide with an I = 8µA. The specified quiescent current is
Q
8µA. Resistors R
FA
respectively. V
REG
(±1% and ±1.27% resistor and V
The DC2033A PCB Trace R
A DC2033A has a serpentine PCB trace that can be used as
an LT6110 external sense resistor for high load currents
(5A to 20A). Remove RJ3 ultra-0Ω jumper and install as
RJ9. Remove standard 0Ω jumpers RJ1 and RJ2 and install
V V
IN REG
REGULATOR
FB
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is 0.79V. The values of
FB
, R and R are 9.53k, 523k and 100k
FB G
= (9.53k + 523k + 100k) • 8µA = 5V
tolerance respectively).
FB
SENSE
DC2033A
E1
REGULATOR
E3
GND
I
IOUT
R
R
OUT
C4 FA
100
E9
R
VFB
FB
E5 E6
R
G V V
OUT1 OUT2
Figure 7. DC2033 Configured for R
DEMO MANUAL DC2033A
RJ7 and RJ8. Figure 7 shows the DC2033A schematic with
LT6110 and PCB R
The copper thickness of a DC2033A PCB trace is two
ounces. A typical resistance for a 2oz square trace is
0.25mΩ at 25°C. The R
0.15 × 0.6 inch rectangular traces connected by 0.015 ×
0.15 inch traces. The current path area of each rectangu-
lar trace is equivalent to three and one-half squares. The
R resistance is 5.4mΩ at 25°C, ±15%. R
PCB
total resistance from the regulator output to the remote
load (minus the R
*R
PCB
5.4mΩ
I I
LOAD LOAD
±15%
RJ7 RJ8
0 0
C2
0.1µF
R1
R
IN1 1k
+
+IN V RS –IN
R
SENSE
+ –
RJ10
LT6110
0
IOUT
–
IMON V
DC2033 F07
E7
IMON
3× I
IOUT
R
MON
100
EB
(PCB Trace Sense Resistor)
PCB
.
SENSE
serpentine trace length is six
PCB
resistance).
SENSE
E2
RJ9
LOAD
R
0Ω
WIRE
E4
GND
*RPCB
is the
WIRE
(WIRE RESISTANCES)
V
LOAD
C
LOAD
LOAD
dc2033af
7