Linear Technology DC1825A Quick setup guide

dc1825af

DEMO MANUAL DC1825A

Description

LT8300

100VIN Micropower Isolated Flyback

Converter with 150V/260mA Switch

Demonstration circuit 1825A is an isolated flyback con-

verter featuring the LT

8300. This demo circuit outputs

5.0V, and maintains tight regulation with a load current

from ~1mA to 250mA and over an input from 22V to 75V,

withanominal48V.Theoutputcurrentcapabilityincreases

with the input voltage.

TheDC1825Aneedsaverysmallminimumload(~1mA)to

regulate the output voltage, thanks to the accurate current

limit capability and ultra low switching frequency of the

LT8300 at very light load. The standby input current of

the demo circuit is less than 400µA(typical) because of

the low quiescent current design of the IC and very small

minimum load requirement.

The Performance Summary table summarizes the perfor-

mance of the demo board at room temperature. The demo

circuitcanbeeasilymodifiedfordifferentapplicationswith

some pre-designed transformers.

performance summary

TheLT8300isasimple-to-usehighvoltagemonolithiciso-

lated flyback converter. No third winding or opto-isolator

is required for regulation. The part sets the isolated out-

put voltage with a single external resistor and integrates

compensation and soft start circuitry inside. Boundary

mode operation provides a small magnetic solution with

improved load regulation. Low ripple Burst Mode

opera-

tionmaintainshighefficiencyatlightloadswhileminimizing

the output voltage ripple. A 260mA, 150V DMOS power

switch is integrated along with all high voltage circuitry

and control logic into a 5-lead ThinSOT™ package.

The LT8300 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 DC1825A.

Design files for this circuit board are available at

http://www.linear.com/demo

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.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage 22 48 75 V

VIN Quiescent Current IOUT = 0mA, VIN = 75V 400 µA

Output Voltage VIN = 22V – 75V

IOUT = 1mA – 250mA 4.75 5 5.25 V

Maximum Output Current VIN = 22V 250 mA

Output Voltage Ripple (Peak to Peak) VIN = 22V – 75V, IOUT = 250mA 50 mV

Typical Switching Frequency VIN = 48V, IOUT = 250mA 330 kHz

Minimum Switching Frequency IOUT = 0mA 8 kHz

Efficiency VIN = 48V, IOUT = 250mA 80 %

Specifications are at TA= 25°C

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dc1825af

DEMO MANUAL DC1825A

Quick start proceDure

TheDC1825Aiseasytosetupto evaluatethe performance

of the LT8300. Refer to Figure 1 for proper equipment

setup and follow the procedure below.

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

boardthroughVIN(E1)andGND(E3)terminals.Connect

the load to the terminals VOUT+ (E4) and VOUT– (E2)

on the board.

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

22V.

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 with

VIN higher than 40V, a RC snubber (200Ω, 150pF) or

Schottky plus Zener clamp circuit is recommended to

make sure the voltage spike at the switching node is

always less than 150V.

3. Checkfortheproperoutputvoltages.Theoutputshould

be regulated at 5.0V (±5%).

NOTE: The LT8300 requires very small minimum load

to maintain good output voltage regulation. A Zener

diode is placed on the output to clamp the voltage to

~5.0V. This Zener is optional, and can be replaced with

a 5.1k 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, 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 (E1) and GND (E3), or VOUT+ (E4) and

VOUT– (E2) terminals. See Figure 2 for proper scope

probe technique.

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dc1825af

DEMO MANUAL DC1825A

Figure 1. Proper Measurement Equipment Setup

Quick start proceDure

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

INPUT OR OUTPUT CAPACITOR

Figure 3. Typical Efficiency and Regulation Curves

LOAD CURRENT (mA)

EFFICIENCY (%)

100 200

DC1825A F03a

250500 150

VIN = 22V

VIN = 48V

LOAD CURRENT (mA)

4.50

VOUT (V)

4.60

4.70

5.00

4.55

4.65

4.75

4.90

4.85

4.95

4.80

100 200

DC1825A F03b

250500 150

VIN = 48V

VIN = 22V

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dc1825af

DEMO MANUAL DC1825A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 2.2µF 100V, 10% 1210 MURATA, GRM32ER72A225KA35L

2 1 C3 CAP., X5R, 100µF 6.3V, 20% 1210 AVX, 12106D107MAT2A

3 1 C4 CAP., X7R, 4700pF 1000V, 10% 1210 VISHAY/VITRAMON, VJ1210Y472KXGAT5Z

4 1 D1 DIODE, SCHOTTKY, 30V 1A PWRDI123 DIODES INC., DFLS130-7

5 1 D2 SMT ZENER DIODE, 5.6V SOD-523 DIODES INC., BZT52C5V6T-7

6 1 R1 RES., CHIP, 806k, 1%, 0805 VISHAY, CRCW0805806KFKEA

7 1 R2 RES., CHIP, 53.6k, 1%, 0603 VISHAY, CRCW060353K6FKEA

8 1 R3 RES., CHIP, 365k, 1%, 0603 VISHAY, CRCW0603365KFKEA

9 1 T1 TRANSFORMER 7:1 WÜRTH ELECTONIK, 750312366

10 1 U1 I.C., LT8300ES5, TSOT-23 LINEAR TECH., LT8300ES5#PBF

Additional Demo Board Circuit Components

1 0 C1 CAP., 0805 OPT

2 0 R4 RES., 0805 OPT

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dc1825af

DEMO MANUAL DC1825A

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

D D

C C

B B

A A

VIN

GND

+5V

22V - 75V

100V MICROPOWER ISOLATED FLYBACK CONVERTER

750312366

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

SEE QSG

5.6V

+5V / 0.25A

VIN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Monday, July 02, 2012

ZHONGMING Y.

N/A

LT8300ES5

DEMO CIRCUIT 1825A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Monday, July 02, 2012

ZHONGMING Y.

N/A

LT8300ES5

DEMO CIRCUIT 1825A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Monday, July 02, 2012

ZHONGMING Y.

N/A

LT8300ES5

DEMO CIRCUIT 1825A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION21-9-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION21-9-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION21-9-12

BZT52C5V6T-7

1 2

OPT

0805

OPT

0805

T1T1

3E2

VOUT-

53.6K

E1E1

DFLS130L

R3 365KR3 365K

806K

E4 VOUT+

E3E3

3.3nF

250C4

1210

3.3nF

250C4

1210

OPT

2.2uF

100V

1210

2.2uF

100V

1210

100uF

6.3V

1210

100uF

6.3V

1210

LT8300ES5

VIN 5

EN/UV

RFB

GND

SW 4

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dc1825af

DEMO MANUAL DC1825A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2012

LT 0912 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC ) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstration board (DEMO BOARD) kitbeingsold or provided by LinearTechnologyisintendedfor 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

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