Linear Technology DC2072A Demo Manual

Description
Demonstration circuit 2072A is an adjustable 500mA
linear regulator featuring the
micropower, low noise and low dropout voltage linear
regulator. The device supplies 500mA of output current
with a typical dropout voltage of 300mV. A 10nF bypass
capacitor reduces output noise to 25µV
to 100kHz bandwidth and soft-starts the reference. The
LT3065's ±45V input voltage rating combined with its
precision current limit make the IC an ideal choice for
robust, high reliability applications.
LT3065 current limit can be programmed by a single
resistor, accurate to ±10% over a wide input voltage and
temperature range. The internal current limit should be
considered when the input-to-output differential is high.
The LT3065 has a PWRGD pin, which becomes high
when the output rises above 90% of its nominal value.
If the output falls below 88.4% of its nominal value for
more than 25µs, the PWRGD pin asserts low. The use of
performance summary
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Output Current
Arrow.com.
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45V, 500mA Low Noise Linear Regulator with
Programmable Current Limit and Power Good
LT 3065. The LT3065 is a
®
RMS
CONDITIONS
V = 5V
OUT
Header in JP1
Header in JP2
Header in JP3
Header in JP4
Header in JP5
Header in JP6
Header in JP7
V = 6V, V
IN OUT
DEMO MANUAL DC2072A
a feedforward cap may cause the PWRGD flag to assert
early during a startup transient. To avoid this, ensure
that the REF/BYP capacitor is significantly larger than the
feedforward capacitor.
LT3065 optimizes stability and transient response with
in a 10Hz
low ESR ceramic capacitors, requiring a minimum
capacitance of 3.3µF.
The LT3065 is available in the thermally-enhanced 10-lead
3mm × 3mm DFN and 12-lead MSOP packages.
The LT3065 data sheet gives a complete description of
the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide for DC2072A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2072A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at T = 25°C
A
= 5V, R10 = 604Ω
LT3065
MIN TYP MAX
5.35 45
1.176 1.2 1.22
1.46 1.5 1.54
1.75 1.8 1.74
1.99 2.04
1.94
2.43 2.5 2.57
3.23 3.32 3.41
4.85 4.99 5.13
445 495 545
UNITS
V
V
V
V
V
V
V
V
mA
dc2072af
1