Linear Technology LTM8057 Guía de configuración rápida
1
dc1987af
DEMO MANUAL DC1987A
Description
LTM8057
Isolated μModule DC/DC Converter
The Demo circuit 1987A is a 2kV AC isolated flyback
μModule
®
DC/DC converter featuring the LTM8057. The
demo circuit is designed for a 5V flyback output from a
4.5V to 29V input. The typical current capability of the 5V
flyback output varies with input voltage from about 110mA
at 4.5VIN to about 350mA at 29VIN. Figure 1 shows the
typical maximum output current on VOUT. R1 provides
the necessary minimum load current to keep the VOUT
in regulation throughout the entire input voltage range.
Please see the typical performance characteristic curves L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
in the LTM8057 data sheet to determine the minimum load
current for other input/output configurations.
The LTM8057 data sheet gives complete description of
the device, operation and application information. The
data sheet must be read in conjunction with this quick
start guide prior to using demo circuit 1987A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1987A
Figure 1. VOUT Typical Maximum Output Current vs VIN Figure 2. VOUT Output Noise Spectrum with IOUT
at 100mA and VIN at 12V
VIN (V)
4
OUTPUT CURRENT (mA)
400
50
300
200
350
250
0
150
100
10 1814 22 24
dc1987 F01
30
6 1612 20 288 26
FREQUENCY (MHz)
0
INTENSITY (dBm)
0
–80
–20
–40
–120
–60
–100
1.0 3.02.0 4.0
dc1987 F02
5.0
0.5 2.51.5 3.5 4.5
BoarD photo
2
dc1987af
DEMO MANUAL DC1987A
Quick start proceDure
Demo circuit 1987A provides an easy method to evalu-
ate the performance of the LTM8057. Refer to Figure 3
for proper measurement equipment setup and follow the
procedure below:
NOTE. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the VIN or
VOUT and GND terminals. See Figure 4 for proper scope
probe technique.
1. With power off, connect the input power supply to VIN
and GND.
2. Turn on the power at the input.
NOTE. Make sure that the input voltage does not
exceed 29V.
3. Check for the proper output voltage. (For VOUT, check
the voltage between VOUT and VOUT–)
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
4. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
performance summary
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage 4.5 V
Maximum Input Voltage 29 V
Output Voltage VOUT VIN = 4.5V – 29V 4.75 5.25 V
Voltage Ripple VOUT VIN = 12V, IOUT = 100mA 10 mV
3
dc1987af
DEMO MANUAL DC1987A
Figure 4. Measuring Input or Output Ripple
Quick start proceDure
Figure 3. DC1987A Proper Equipment Setup
GNDVIN/VOUT
4
dc1987af
DEMO MANUAL DC1987A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., CHIP, X5R, 10µF, 50V, 10% 1210 MURATA, GRM32ER71H106KA12L
2 1 C2 CAP., CHIP, X5R, 22µF, 16V, 10% 1206 AVX, 1206YD226KAT2A
3 1 C4 CAP., CHIP, X5R, 4.7µF, 50V, 20% 0805 TDK, C2012X5R1H475M
4 1 C6 CAP., CHIP, X7R, 0.1µF, 25V, 10% 0603 AVX, 06033C104KAT2A
5 1 R1 RES., CHIP, 200Ω, 1W, 1% 1210 VISHAY, CRCW1210200RFKEA
6 1 R2 RES., CHIP, 200k, 1/10W, 1% 0603 VISHAY, CRCW0603200KFKEA
7 1 R3 RES., CHIP, 90.9k, 1/10W, 1% 0603 VISHAY, CRCW060390K9FKEA
8 1 R5 RES., CHIP, 6.98k, 1/10W, 1% 0603 VISHAY, CRCW06036K98FKEA
9 1 U1 IC., LINEAR LTM8057EY#PBF LINEAR TECH., LTM8057EY#PBF
Additional Demo Board Circuit Components
1 0 C3 (OPT) CAP., 0603
2 1 C5 CAP., CHIP, X7R, 1µF, 16V, 10% 0603 AVX, 0603YC105KAT2A
3 0 C8 (OPT) CAP., 1210
4 1 CIN1 CAP., TANT. 10µF, 35V, CASE-C AVX, TAJC106K035R
5 0 C7 (OPT) CAP., 1808
6 0 L1 OPT.
7 0 R6 OPT. 0603
Hardware: For Demo Board Only
1 4 E1-E4 TESTPOINT, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
1 2 E5, E8 TESTPOINT, TURRET, 0.064" MILL-MAX 2308-2-00-80-00-00-07-0
5
dc1987af
DEMO MANUAL DC1987A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
FOR INPUT VOLTAGE DAMPING PURPOSE ONLY.
0805
1206
OPT 5V
*
1%
1%
1%
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
*
** SEE QUICK START GUIDE FOR OUTPUT CURRENT RANGE.
**
4.5V - 29V VIN VIN
R6
OPT
R6
OPT
R3
90.9k
R3
90.9k
C6
0.1uF
25V
C6
0.1uF
25V
U1
LTM8057EY
U1
LTM8057EY
RUN
F3
GND
E4
BIAS
H5
VOUT A6
SS
H6
VIN
G1
GND
F7
VOUT- A2
VOUT- A3
VIN
H1
GND
E5
GND
E6
GND
E7
GND
F4
GND
F5
GND
F6
GND
G4
GND
G5
GND
E3
VOUT- A4
VOUT- A5
VOUT- B3
VOUT- B4
VOUT- B5
VOUT A7
VOUT B6
VOUT B7
VIN
G2
VIN
H2
VOUT- B2
VOUT- B1
VOUT- A1
ADJ
G7
GND
G6
GND
H4
GND
E2 GND
E1
GND
H7
C7
470pF
OPT
GA342QR7GD471KW01L
1808
C7
470pF
OPT
GA342QR7GD471KW01L
1808
E4 VOUT-
E4 VOUT-
C8
OPT
1210
C8
OPT
1210
E5
RUN E5
RUN
R5
6.98k
R5
6.98k
E8
BIAS E8
BIAS
L1
10uH
CDRH4D22/HP
L1
10uH
CDRH4D22/HP
R1
200
1210
R1
200
1210
C4
4.7uF
50V
C4
4.7uF
50V
+
10uF
35V
CIN1
+
10uF
35V
CIN1 C1
10uF
1210
50V
C1
10uF
1210
50V
R2
200k
R2
200k
C5
1uF
C5
1uF
E3
VOUT
E3
VOUT
C2
22uF
16V
C2
22uF
16V
E2
GND E2
GND
E1
VIN
E1
VIN
C3
OPT
C3
OPT
6
dc1987af
DEMO MANUAL DC1987A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com
LINEAR TECHNOLOGY CORPORATION 2014
LT 0614 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims
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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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