4
dc2033af
DEMO MANUAL DC2033A
three feedback resistors for an LT6110 connection, as
in Figure 1. In addition, a DC2033A includes pads for a
feedback loop compensation capacitor, C4.
A Quick Design Guide.
Variable Definitions:
I
LOAD
is the maximum load current and I
IOUT
is the LT6110
output current, (design target is 100µA).
R
SENSE
is the LT6110 internal or external current sense
resistor and R
WIRE
is the copper wire resistance.
(R
WIRE
includes the resistance of the load current car-
rying PCB traces and wire connectors minus the R
SENSE
resistance).
V
FB
is the regulator's feedback reference voltage.
I
Q
is the no-load quiescent current flowing through the
resistor feedback divider, (I
Q
= V
FB
/R
G
), (refer to the
regulator’s demo manual).
Quick start setup
V
REG
is the no-load current regulator output voltage.
Quick Design Equations:
R
IN1
=
V
SENSE
I
IOUT
V
SENSE
=
I
LOAD
•
R
SENSE
R
FA
=
V
DROP
I
IOUT
V
DROP
=
I
LOAD
•
(R
SENSE
+
R
WIRE
)
R
FB
=
V
REG
– V
FB
I
Q
R
G
=
V
FB
I
Q
Quick Design Check:
V
REG
=
(R
FA
+
R
FB
+
R
G
)
•
I
Q
NOTE:
For DC2033A REGULATOR input voltages higher
than 36V, remove the RJ10 jumper sorting the 27V Zener,
D1. Refer to the LT6110 data sheet for additional applica-
tion circuits and information.
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