Linear Technology Analog Devices LT8301 Quick setup guide

dc2138af

DEMO MANUAL DC2138A

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage 10 24 32 V

Standby Current IOUT = 0mA, VIN = 24V, VOUT = 5V 950 µA

Output Voltage VIN = 12V to 32V, IOUT = 6mA to 700mA 4.75 5 5.25 V

Maximum Output Current VIN = 12V

VIN = 24V

700

1000

Output Voltage Ripple (Peak to Peak) VIN = 24V, IOUT = 1A 90 mV

Switching Frequency VIN = 24V, IOUT = 1A 190 kHz

Efficiency VIN = 24V, IOUT = 1A 83.2 %

Description

LT8301

42VIN Micropower Isolated Flyback

Converter with 65V/1.2A Switch

Demonstration circuit 2138A is an isolated flyback con-

verter featuring the LT8301. This demo circuit outputs

5V from a 10V to 32V input, with a nominal of 24V. The

output current capability increases with the input voltage.

The standby input current of the demo circuit is less than

950µA (typical) at VIN = 24V.

The Performance Summary table summarizes the perfor-

mance of the demo board at room temperature. The demo

circuit can be easily modifiedfor differentapplications with

some pre-designed transformers.

The DC2138A needs a very small minimum load (~6mA)

to regulate the output voltage, thanks to the accurate

current limit capability and ultralow switching frequency

of LT8301 at very light load. On the board, a Zener diode

is placed on the output to clamp the voltage to ~5V. This

Zener is optional, and can be replaced with a 0.8k resistor.

The LT8301 is a simple-to-use high-voltage monolithic

isolatedflybackconverter.No thirdwinding oropto-isolator

L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

performance summary

is required for regulation. The part sets the isolated output

voltage with a single external resistor and integrates loop

compensationand soft-startcircuitry inside the IC. Bound-

ary mode operation provides a small magnetic solution

with improved load regulation. Low-ripple Burst Mode

operation maintains high efficiency at light loads while

minimizing the output voltage ripple. A 1.2A, 65V DMOS

power switch is integrated along with all high-voltage

circuitry andcontrol logicinto a 5-lead ThinSOT™ package.

The LT8301 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 demo circuit 2138A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2138A

Specifications are at TA= 25°C

dc2138af

DEMO MANUAL DC2138A

Quick start proceDure

Demo circuit 2138A is easy to set up to evaluate the

performance of the LT8301. Refer to Figure 1 for proper

equipment setup and follow the procedure below.

1. With power off, connect the input power supply to the

board through VIN and GND terminals. Connect the

load to the terminals VOUT+ and VOUT– on the board.

2. Turn on the power at the input. Increase VIN slowly to

10V.

NOTE. Make sure that the input voltage is always within

spec. To operate the board with higher input/output

voltage, input capacitor, output capacitor and output

diode with higher voltage ratings are needed.

NOTE. To run overload tests on the demo board at high

line, additional RC snubber might be needed to make

sure the voltage spike at the switching node is always

less than 65V.

3. Check for the proper output voltages. The output should

be regulated at 5V (±5%).

NOTE. The LT8301 requires very small minimum load

to maintain good output voltage regulation. A Zener

diode is placed on the output to clamp the voltage to

~5V. This Zener is optional, and can be replaced with

a 0.8k resistor.

4. Once the proper output voltage is established, adjust

the input voltage and load current within the operating

range and observe the output voltage regulation, tran-

sient, ripple voltage, efficiency and other parameters.

NOTE. When measuring the input or output voltage

ripples, 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 capacitor terminals. See Figure 2 for

proper scope probe technique.

Figure 1. Proper Measurement Equipment Setup

dc2138af

DEMO MANUAL DC2138A

Quick start proceDure

Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple

Figure 3. Typical Efficiency Curves

Figure 4. Typical Regulation Curves

INPUT OR OUTPUT CAPACITOR

LOAD CURRENT (A)

EFFICIENCY (V)

60 0.2 0.6

dc2138a F03

1.0

0.4 0.8

VIN = 12V

VIN = 24V

VIN = 32V

LOAD CURRENT (A)

0.006

OUT

(V)

5.25

5.15

5.10

5.05

4.85

5.20

4.95

4.90

5.00

4.80

4.75 0.206 0.606

dc2138a F04

0.406 0.806

VIN = 12V

VIN = 24V

VIN = 32V

dc2138af

DEMO MANUAL DC2138A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 Cin CAP., ALUM., 22µF, 50V SUN ELECT., 50CE22BS

2 1 C1 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

3 1 C2 CAP., X5R, 100µF, 6.3V, 20%, 1210 MURATA, GRM32ER6J107ME20L

4 1 D1 DIODE, PMEG3020EH, SOD-123 NXP, PMEG3020EH

5 1 D2 DIODE, 5.6V, SOD-523 DIODES., BZT52C5V6T-7-F

6 1 D3 DIODE., 1N4148WS, SOD323 DIODES., 1N4148WS-7-F

7 1 D4 DIODE, CMHZ5248B, SOD-123 CENTRAL., CMHZ5248B

8 1 R1 RES., CHIP, 1M, 1/8W, 1% 0805 VISHAY, CRCW08051M00FKEA

9 1 R2 RES., CHIP, 210k, 1/10W, 1% 0603 VISHAY, CRCW0603210KFKEA

10 1 R3 RES., CHIP, 154k, 1/10W, 1% 0603 VISHAY, CRCW0603154KFKEA

11 1 T1 TRANSFORMER, 750313974 WURTH, 750313974

12 1 U1 I.C. FLYBACK CONVERTER, SOT23-5 LINEAR TECH., LT8301ES5#PBF

Additional Demo Board Circuit Components

1 0 C3 (OPT) CAP., X7R, 0.22µF, 6.3V, 10%, 0603 MURATA, GRM188R70J224KA

2 0 C4 (OPT) CAP., X7R, 0.01µF, 50V, 10%, 0603 AVX, 06035C103KAT2A

3 0 C5 (OPT) CAP., X7R, 4.7µF, 50V, 10%, 1210 AVX, 12105C475KAT2A

4 0 C6 (OPT) CAP., ALUM., 22µF, 50V SUN ELECT., 50CE22BS

5 0 C7 CAP., X7R, 3300pf, 500V, 10% 1210 AVX, 12107C332KAT2A

6 0 FB1 (OPT) BEAD, 1206 TAIYO YUDEN, MJ3216HS800

7 0 L1 (OPT) IND., 10µH SUMIDA, CDRH4D22HPNP-100MC

8 0 R4 (OPT) RES., CHIP, 2.21k, 1/8W, 1% 0805 VISHAY, CRCW080512K21FKEA

Hardware: For Demo Board Only

1 5 E1-E5 TESTPOINT, TURRET, 0.094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 3 PIN 0.079" SINGLE ROW HEADER SAMTEC, TMM103-02-L-S

3 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

parts List

dc2138af

DEMO MANUAL DC2138A

VIN

GND

10V - 32V

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

5.6V

OPTIONAL CIRCUIT

[email protected], VIN>12V

[email protected], VIN>24V

VIN

VIN VIN

BZT52C5V6T-7

0603

0.01uF,50V

0603

0.01uF,50V

OPT

EN/UVLO

210K

1210

3.3nF

250V

1210

3.3nF

250V

E1E1

PMEG3020EH

22uF,50V

50CE22BS

22uF,50V

50CE22BS

R3 154KR3 154K

1N4148WS

FB1

BEAD

TAIYO YUDEN

FB MJ3216HS800

FB1

BEAD

TAIYO YUDEN

FB MJ3216HS800

1M D4

CMHZ5248B

1 2

WURTH, 750313974

JP1

DIS

JP1

DIS

OPT

E2E2

10uF

50V

1210

10uF

50V

1210

VOUT-

22uF

50V

Cin

50CE22BS

22uF

50V

Cin

50CE22BS

1210

4.7uF,50V

1210

4.7uF,50V

100uF

6.3V

1210

100uF

6.3V

1210

VOUT+

LT8301ES5

VIN 5

EN/UV

RFB

GND

SW 4

CDRH4D22/HP

SUMIDA

10UH

CDRH4D22/HP

SUMIDA

10UH

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

dc2138af

DEMO MANUAL DC2138A

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 0314 • 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

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