Linear Technology DC1228A Quick setup guide

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DEMO MANUAL DC1228A
Description
LT3573
Isolated Monolithic
Flyback Converter
Demonstration circuit 1228A is an isolated flyback con-
verterfeaturingtheLT
®
3573.Thisdemocircuitisdesigned
for a 5.0V output from a 10V to 30V input. The maximum
output current is 1A when the input voltage is higher than
20V. No third winding or opto-isolator is required for
regulation. The part senses the isolated output voltage
directly from the primary-side flyback waveform.
The LT3573 operates with input supply voltages from 3V
to 40V, and can deliver an output power up to 7W with
no external power devices. The LT3573 utilizes bound-
ary mode operation to provide a small magnetic solution 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.
performance summary
with improved load regulation. The LT3573 can be used
in industrial, automotive and medical applications where
an isolated output is required.
The LT3573 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demonstration circuit 1228A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1228A
Specifications are at TA= 25°C
PARAMETER CONDITION MIN TYP MAX UNITS
Input Voltage Range 10 30 V
Output Voltage VOUT VIN = 10V to 30V 4.75 5 5.25 V
Maximum Output Current IOUT VIN = 10V to 20V
VIN = 20V to 30V 0.7
1.0 A A
Switching Frequency VIN = 12V, IOUT = 0.7A
VIN = 24V, IOUT = 1A 169
238 kHz kHz
Voltage Ripple VOUT VIN = 24V, IOUT = 1A 100 mV
Efficiency VIN = 24V, IOUT = 1A 84 %

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DEMO MANUAL DC1228A
Quick start proceDure
Demonstration circuit 1228A is easy to set up to evalu-
ate the performance of the LT3573. Refer to Figure 1 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. See Figure 2 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
30V.
3. Check for the proper output voltages.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load current is not set too
high.
4. Once the proper output voltage is established, adjust
the load current within the operating range and observe
the output voltage regulation, ripple voltage, efficiency
and other parameters.

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DEMO MANUAL DC1228A
Figure 2. Measuring Input or Output Ripple
Figure 1. Proper Measurement Equipment Setup
VIN OR VOUT GND
Quick start proceDure

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DEMO MANUAL DC1228A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C2 CAP., X7R, 4.7µF 50V, 1210 MURATA, GRM32ER71H475K
2 1 C4 CAP., X7R, 47µF 10V, 1210 MURATA, GRM32ER71A476K
3 1 C7 CAP., X7R, 0.1µF 16V, 0402 TDK, C1005X7R1C104MT
4 1 C8 CAP., NPO, 100pF 50V,0402 AVX, 04025A101JAT2A
5 2 C12, C9 CAP., X7R, 1µF 50V, 0805 MURATA, GRM21BR71H105K
6 1 C10 CAP., X7R, 0.22µF 25V, 0603 MURATE, GRM188R71E224K
7 1 C11 CAP., X7R, 4700pF 25V, 0402 AVX, 04023C472KAT2A
8 1 C13 CAP., NPO, 10pF 50V, 0402 AVX, 04025A100JAT2A
9 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER 3.0A DIODES INC., B340A-13-F
10 1 D2 DIODE, SWITCHING, SOD323 DIODES INC., 1N4148WS-7-F
11 1 D3 DIODE, SCHOTTKY MINI, SOD323 CENTRAL SEMI., CMDSH-3
12 1 R3 RES., CHIP 357k 1/16W 1%, 0402 VISHAY, CRCW0402357KFKED
13 1 R6 RES., CHIP 93.1k 1/16W 1%, 0402 VISHAY, CRCW040293K1FKED
14 1 R7 RES., CHIP 84.5k 1/16W 1%, 0402 VISHAY, CRCW040284K5FKED
15 1 R8 RES., CHIP 2k 1/10W 1%, 0805 VISHAY, CRCW08052K00FKEA
16 1 R9 RES., CHIP 20k 1/16W 1%, 0402 VISHAY, CRCW040220K0FKED
17 1 R10 RES., CHIP 10k 1/16W 1%, 0402 VISHAY, CRCW040210K0FKED
18 1 R11 RES., CHIP 6.04k 1/16W 1%, 0402 VISHAY, CRCW04026K04FKED
19 1 R15 RES., CHIP 12.4k 1/16W 1%, 0402 VISHAY, CRCW040212K4FKED
20 1 T1 XFMR, 750370047 WÜRTH, 750370047
21 1 U1 IC., LT3573EMSE, MSE16 LINEAR TECH., LT3573EMSE
Additional Demo Board Circuit Components
1 1 C1 CAP., ELECTROLYTIC, 22µF 50V, C-SANYO-CE-BS-6.3X6.0 SANYO, 50CE22BS
2 0 C5 CAP., 22µF 50V, C-SANYO-CE-BS-6.3X6.0 OPT SANYO, 50CE22BS
3 0 C14 CAP., 1206 OPT OPT
4 0 C19 CAP., X7R, 4.7µF 50V, 1210 OPT MURATA, GRM32ER71H475K
5 0 C20 CAP., X7R, 0.01µF 50V, 0603 OPT AVX, 06035C103KAT
6 0 FB1 BEAD, 1206 OPT TAIYO YUDEN, FB MJ3216HS800
7 0 L1 IND, PWR, L-CDRH4D22/HP OPT SUMIDA, CDRH4D22HPNP-100MC
8 0 R2 RES., 0603 OPT OPT
9 1 R4 RES., CHIP 499Ω 1/10W 1%, 0805 VISHAY, CRCW0805499RFKEA
Hardware: For Demo Board Only
1 5 E1, E2, E3, E5, E6 TP, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

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DEMO MANUAL DC1228A
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
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
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  
   
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  
 
 
 
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TECHNOLOGY
    
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        
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
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
 
 
 
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TECHNOLOGY
    
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        
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











 
 
 




TECHNOLOGY
    

        

















   
  
   
       
 

 

   
   




+
 


+
 






 








 
 


 















           





     
     
 

 

       




 
   

       
   




   








 
+
  


+
  















 




     
       










6
dc1228af
DEMO MANUAL DC1228A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0913 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board(DEMO BOARD) kit being soldor providedby Linear Technologyis intendedfor 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 LTC 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

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