DC2437A - Demo Manual

DEMO MANUAL DC2437A
LT3066
45V, 500mA Low Noise
Linear Regulator with Programmable
Current Limit and Active Output Discharge
Description
Demonstration circuit 2437A is an adjustable 500mA
linear regulator featuring the LT®3066. The LT3066 is a
micropower, low noise and low dropout voltage linear
regulator that operates over a 1.8V to 45V input voltage
range. The device supplies 500mA of output current with
a typical dropout voltage of 300mV. A 10nF bypass capacitor reduces output noise to 25µVRMS across a 10Hz
to 100kHz bandwidth and soft-starts the reference. The
LT3066’s ±45V input voltage rating combined with its
precision current limit make the IC an ideal choice for
robust, high reliability applications. LT3066 features an
NMOS pull-down that discharges the output if SHDN or
IN is driven low.
The LT3066’s 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.
LT3066 has a PWRGD pin which goes high when the output
rises above 90% of its nominal value. If the output falls
Performance Summary
below 88.4% of its nominal value for more than 25µs, the
PWRGD pin asserts low. The use of a feedforward cap may
cause the PWRGD flag to assert early during a start-up
transient. To avoid this, ensure that the REF/BYP capacitor is significantly larger than the feedforward capacitor.
The LT3066 optimizes stability and transient response
with low ESR ceramic capacitors, requiring a minimum
capacitance of 3.3µF.
The LT3066 is available in thermally-enhanced 12-Lead
4mm × 3mm DFN and MSOP packages.
The LT3066 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 demo circuit 2437A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2437A
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 TA = 25°C
PARAMETER
CONDITIONS
MIN
Input Voltage Range (V)
VOUT = 3.3V
3.9
Output Voltage VOUT (V)
Header in JP1
Header in JP2
Header in JP3
Header in JP4
Header in JP5
Header in JP6
Header in JP7
Maximum Output Current (mA)
VIN = 5V, VOUT = 3.3V, R10 = 604Ω
TYP
MAX
45
1.176
1.46
1.75
1.94
2.43
3.23
4.85
1.2
1.5
1.8
1.99
2.5
3.32
4.99
1.22
1.54
1.74
2.04
2.57
3.41
5.13
445
497
545
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DEMO MANUAL DC2437A
Quick Start Procedure
Demonstration circuit 2437 is easy to set up to evaluate
the performance of the LT3066. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
NOTE: Make sure that the input voltage does not exceed
45V.
NOTE: The shutdown jumper JP2 shunt is required to be
placed in the OFF or ON position for proper operation.
NOTE: Place the output voltage selection jumper JP1 at
the desired position.
NOTE: Do not hot-plug the input voltage terminal VIN. The
absolute maximum voltage on VIN is 50V and hot-plugging
a power supply through wire leads to the demonstration
circuit can cause the voltage on the extremely low ESR
ceramic input capacitor to ring to twice its DC value. In
order to protect the IC, a higher ESR Aluminum Electrolytic capacitor is placed at the input terminals. This may
protect against some, but not all, input transients due to
hot-plugging with a power supply. See Application Note
88 for more details.
NOTE: Connect the power supply (with power off), load,
and meters as shown in Figure 1.
1.After all connections are made, turn on the input power
and verify the output voltage according to the output
voltage selection jumper JP1. If the output voltage is
different from the above values, use the USER option
and install R8. Select R8 according to the following
equation:
R8 = (VOUT/0.6 – 1) • 61.9k
NOTE: If the output voltage is too low, temporarily
disconnect the load to make sure that the load is not
set too high.
2.Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, PWRGD and other parameters.
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DEMO MANUAL DC2437A
Quick Start Procedure
Figure 1. Proper Measurement Equipment Setup
VOUT
GND
Figure 2. Measuring Input or Output Ripple
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DEMO MANUAL DC2437A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP, 10µF, X7R, 50V, 10%, 1210
MURATA, GRM32ER71H106KA12L
Required Circuit Components
1
1
C2
2
3
C3, C4, C5
CAP, 3.3µF, X7R, 25V, 10%, 0805
MURATA, GRM21BR71E335KA73L
3
2
C6, C7
CAP, 0.01µF, X7R, 16V, 10%, 0603
AVX, 0603YC103KAT2A
4
1
C8
CAP, 0.022µF, X7R, 16V, 10%, 0603
MURATA, GRM188R71C223KA01D
5
1
C9
CAP, 0.47µF, X7R, 50V, 10%, 0603
TDK, C1608X7R1H474K080AC
6
2
R1, R9
RES, 61.9kΩ, 1%, 1/10W, 0603
VISHAY, CRCW060361K9FKEA
7
1
R2
RES, 93.1kΩ, 1%, 1/10W, 0603
VISHAY, CRCW060393K1FKEA
8
1
R3
RES, 124kΩ, 1%, 1/10W, 0603
PANASONIC, ERJ3EKF1243V
9
1
R4
RES, 143kΩ, 1%, 1/10W, 0603
VISHAY, CRCW0603143KFKEA
10
1
R5
RES, 196kΩ, 1%, 1/10W, 0603
VISHAY, CRCW0603196KFKEA
11
1
R6
RES, 280kΩ, 1%, 1/10W, 0603
VISHAY, CRCW0603280KFKEA
12
1
R7
RES, 453kΩ, 1%, 1/10W, 0603
VISHAY, CRCW0603453KFKEA
13
1
R10
RES, 604Ω, 1%, 1/10W, 0603
VISHAY, CRCW0603604RFKEA
14
1
R11
RES, 499kΩ, 1%, 1/10W, 0603
PANASONIC, ERJ3EKF4993V
15
1
U1
IC, LOW NOISE LINEAR REGULATOR, 4MM × 3MM, DFN
LINEAR TECHNOLOGY, LT3066EDE#PBF
Additional Demo Board Circuit Components
1
0
C1 (OPT)
CAP, OPTION, ALUM ELECT, SMD
2
0
R8, R12, R13, R14
(OPT)
RES, OPTION, 0603
Hardware: For Demo Board Only
1
6
E1, E2, E3, E4, E5,
E6
TEST POINT, TURRET, 0.094", MTG HOLE
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
CONN, HEADER, MALE, 2X8, 2MM, THT
SAMTEC, TMM-108-02-L-D
3
1
JP2
CONN, HEADER, MALE, 1X3, 2MM, THT
SAMTEC, TMM-103-02-L-S
4
2
XJP1, XJP2
CONN, SHUNT, FEMALE, 2 POS, 2MM
SAMTEC, 2SN-BK-G
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DEMO MANUAL DC2437A
Schematic Diagram
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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DEMO MANUAL DC2437A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
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ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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Linear Technology Corporation
LT 0116 • PRINTED IN USA
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●
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