Linear Technology LTM8058 Demo Manual

Page 1
Description
DEMO MANUAL DC1988A
LTM8058
Isolated μModule DC/DC Converter
with LDO Post Regulator
Demonstration circuit 1988A is a 2kV AC (3kVDC) isolated
®
DC/DC converter with LDO post regulator
®
8058. The demo circuit is designed for
a 6V flyback output and a 5V post regulator output from a 4.5V to 30V input. The current capability of the 6V fly­back output varies with input voltage from about 100mA at 4.5V typical maximum output current on V not loaded. V The current capability of V rent capability
to about 320mA at 30VIN. Figure 1 shows the
IN
when V
OUT1
is the LDO post regulator from V
OUT2
is limited by either the cur-
OUT2
of V
OUT1
minus V
loading or the 300mA
OUT1
OUT2
OUT1
current limit on the LDO post regulator itself. R1 provides the necessary minimum load current to keep the V
OUT1
in regulation throughout the entire input voltage range. Please see the typical performance characteristic curves
performance summary
PARAMETER CONDITIONS VALUE
Minimum Input Voltage 4.5V Maximum Input Voltage 30V Output Voltage V Output Voltage V Voltage Ripple V Voltage Ripple V
VIN = 7V to 30V 6V ±5%
OUT1
OUT2 OUT1 OUT2
Specifications are at TA = 25°C
VIN = 7V to 30V 5.0V ±3% VIN = 12V, I VIN = 12V, I
in the LTM8058 data sheet to determine the minimum load current for other input/output configurations.
The two-stage converter provides an isolated flyback output as well as a low noise LDO output. Figure 2 shows the output noise spectrum on V output noise spectrum on V
The LTM8058 data sheet gives a complete description
is
of the device, operation and application information. The
.
OUT1 OUT2
data sheet must be read in conjunction with this quick start guide for demo circuit 1988A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1988A
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
OUT2 OUT2
= 0mA, I = 0mA, I
= 100mA 10mV
OUT2
= 100mA 5mV
OUT2
and Figure 3 shows the .
BoarD photo
dc1988af
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DEMO MANUAL DC1988A
dc1988a F03
Quick start proceDure
Demo circuit 1988A is easy to set up to evaluate the per­formance of the LTM8058. Refer to Figure 4 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 V
and GND terminals. See Figure 5 for proper scope
V
OUT
IN
or
probe technique.
1. With power off, connect the input power supply to V
IN
and GND.
2. Turn on the power at the input. NOTE. Make sure that the input voltage does not exceed 30V.
3. Check for the proper output voltages. (For V the voltage between V
OUT1
the voltage between V
OUT2
and V
and V
OUT
OUT
. For V
.)
OUT1 OUT2
, check , check
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.
400
350
300
250
200
150
OUTPUT CURRENT (mA)
100
50
0
6 22 24 26 28 308 10 12 181614
4
20
VIN (V)
dc1988a F01
0
–10
–20
–30
–40
–50
–60
INTENSITY (dBm)
–70
–80
–90
0
Figure 2. V at 100mA and VIN at 12V (V
Figure 3. V
OUT1
0
–10
–20
–30
–40
–50
–60
INTENSITY (dBm)
–70
–80
–90
0
OUT2
FREQUENCY (MHz)
Output Noise Spectrum with I
OUT2
FREQUENCY (MHz)
Output Noise Spectrum with I
at 100mA and VIN at 12V (V
3.5 4 4.5 50.5 1 2.521.5
3
dc1988a F02
Has No Extra Load)
3.5 4 4.5 50.5 1 2.521.5
3
Has No Extra Load)
OUT1
OUT1
OUT2
Figure 1. V Current vs VIN with V
Typical Maximum Output
OUT1
OUT2
Unloaded
2
dc1988af
Page 3
Quick start proceDure
DEMO MANUAL DC1988A
+
+
LOAD
LOAD
+
+
+
+
dc1988a F04
Figure 4. DC1988A Proper Equipment Setup
GND
VIN
+
+
+
Figure 5. Measuring Input or Output Ripple
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DEMO MANUAL DC1988A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., CHIP, X5R, 10μF, 50V, 10% 1210 MÜRATA, GRM32ER71H106KA12L 2 1 C2 CAP., CHIP, X5R, 22μF, 16V, 10% 1206 AVX, 1206YD226KAT2A 3 1 C3 CAP., CHIP, X5R, 10μF, 16V, 10% 1206 AVX, 1206YD106KAT2A 4 1 C4 CAP., CHIP, X5R, 4.7μF, 50V, 20% 0805 TDK, C2012X5R1H475M 5 1 C5 CAP., CHIP, X7R, 0.01μF, 25V, 10% 0603 AVX, 06033C103kAT2A 6 1 C6 CAP., CHIP, X7R, 0.1μF, 25V, 10% 0603 AVX, 06033C104KAT2A 7 1 R1 RES., CHIP, 200k, 1/4W, 1% 1210 VISHAY, CRCW1210200RFKEA 8 1 R2 RES., CHIP, 200k, 1/10W, 1% 0603 VISHAY, CRCW0603200KFKEA 9 1 R3 RES., CHIP, 90.9k, 1/10W, 1% 0603 VISHAY, CRCW060390K9FKEA
10 1 R4 RES., CHIP, 162k, 1/10W, 1% 0603 VISHAY, CRCW0603162KFKEA 11 1 R5 RES., CHIP, 5.9k, 1/10W, 1% 0603 VISHAY, CRCW06035k90FKEA 12 1 U1 IC., LINEAR TECH., LTM8058EY#PBF LINEAR TECH., LTM8058EY#PBF
Additional Demo Board Circuit Components
1 0 C7 (OPT) CAP., 1808 2 0 C8, C9 (OPT) Cap., 1210 3 2 C10, C11 CAP., CHIP, X7R, 1μF, 16V, 10% 0603 AVX, 0603YC105KAT2A 4 0 C12 (OPT) CAP., 0603 5 1 CIN1 CAP., TANT., 10μF, 35V CASE-C AVX, TAJC106K035RNJ 6 0 L1 OPT. 7 0 R6 OPT. 0603
Hardware: For Demo Board Only
1 6 E1-E4, E6, E7 Testpoint 2
2 E5, E8 Testpoint, Turret, .064" Mill-Max, 2308-2-00-80-00-00-07-0
, Turret, .094" Mill-Max, 2501-2-00-80-00-00-07-0
4
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schematic Diagram
**
DEMO MANUAL DC1988A
B7
B6
VOUT1
VOUT1
VOUT1E3VOUT1
A7
A6
VOUT1
6V
E3
C2
C8
C8
VOUT1
**
C10
C10
R1
22uF
1uF
1uF
200
16VC222uF
16V
OPT
OPT
B5
16V
16V
1210R1200
1210
1206
1210
1210
B3
VOUT-B4VOUT-
VOUT-E4VOUT-
E4
A5
VOUT-
VOUT-A4VOUT-
A3
VOUT-
5V
VOUT2E6VOUT2
E6
C3
C3
B1
A1
VOUT2
**
C11
C11
10uF
10uF
C9
C9
VOUT2
1uF
1uF
C5
C5
OPT
OPT
16V
16V
16V
16V
1206
1210
1210
0.01uF
0.01uF
VOUT-E7VOUT-
E7
25V
25V
B2
BYP
C7
C7
OPT
OPT
1808
1%
1808
GA342QR7GD471KW01L
GA342QR7GD471KW01L
470pF
470pF
R4
1%
162kR4162k
A2
GND
H7
GND
H4
GND
ADJ2
G6
GND
G5
GND
G4
GND
F7
GND
F6
GND
F5
GND
F4
GND
E7
GND
E6
GND
E5
GND
E4
GND
E3
GND
E2
GND
E1
R5
ADJ1
5.9kR55.9k
G7
U1
U1
LTM8058EY
LTM8058EY
L1
L1
10uH
10uH
VIN
VING2VIN
VIN
H1
H2
G1
VIN
C1
50V
C1
50V
10uF
10uF
OPT
CDRH4D22/HP
CDRH4D22/HP
*
VIN
10uF
10uF
CIN1
CIN1
+
+
E1
VINE1VIN
4.5V - 30V
35V
35V
1210
1210
GNDE2GND
C12
C12
OPT
SS
1%
H5
BIAS
E8
BIASE8BIAS
H6
C6
C6
25V
25V
0.1uF
0.1uF
C4
50V
C4
50V
4.7uF
4.7uF
0805
RUN
F3
R2
200kR2200k
1%
R3
90.9kR390.9k
R6
OPTR6OPT
E2
E5
RUNE5RUN
OPT
NOTE: UNLESS OTHERWISE SPECIFIED
SEE QUICK START GUIDE FOR OUTPUT CURRENT RANGE.
FOR INPUT VOLTAGE DAMPING PURPOSE ONLY.
*
1. ALL RESISTORS ARE 0603.
2. ALL CAPACITORS ARE 0603.
dc1988af
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 DC1988A
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 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 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. LTC 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 LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
Linear Technology Corporation
6
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
dc1988af
LT 0614 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2014
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