Linear Technology DC2490A Quick setup guide

dc2490af

DEMO MANUAL DC2490A

Description

LT8303

Micropower No-Opto

Isolated Flyback Converter

Demonstration circuit 2490A is a micropower no-opto

isolated flyback converter featuring the LT

8303. This

demo circuit outputs 5V, and maintains tight regulation

with a load current from 2.5mA to 0.84A over an input

voltage from 36V to 72V. The output current capabil-

ity increases with the input voltage, as shown in the

Performance Summary table.

The DC2490A needs less than 0.5% of its full output

power as a minimum load to maintain good output voltage

regulation. On the DC2490A, in order to avoid preload-

ing, a 5.6V Zener diode is placed between its VOUT+and

VOUT–to serve as a minimum load.

The Performance Summary table summarizes the perfor-

mance of the demo board at room temperature. The demo

circuit can be easily modified for different applications with

some predesigned transformers.

The LT8303 is a micropower high voltage isolated fly-

back converter. By sampling the isolated output voltage

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

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

property of their respective owners.

performance summary

directly from the primary-side flyback waveform, the part

requires no third winding or opto-isolator for regulation.

The output voltage is programmed with a single external

resistor. Boundary mode operation provides a small mag-

netic solution with excellent load regulation. Low ripple

Burst Mode

operation maintains high efficiency at light

load while minimizing the output voltage ripple. A 0.45A,

150V DMOS power switch is integrated along with all

the high voltage circuitry and control logic into a 5-lead

ThinSOT™ package.

The LT8303 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 2490A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2490A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage 36 48 72 V

Output Voltage IOUT = 2.5mA to 0.65A 4.75 5 5.25 V

Maximum Output Current VIN = 36V 0.65 A

VIN = 48V 0.73 A

VIN = 72V 0.84 A

Output Voltage Ripple (Peak to Peak) VIN = 48V, IOUT = 0.73A 50 mV

Typical Switching Frequency VIN = 48V, IOUT = 0.73A 260 kHz

Efficiency VIN = 36V, IOUT = 0.65A 86 %

VIN = 48V, IOUT = 0.73A 86 %

VIN = 72V, IOUT = 0.84A 85 %

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dc2490af

DEMO MANUAL DC2490A

Quick start proceDure

Demonstration circuit 2490A is easy to set up to evalu-

ate the performance of the LT8303. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

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

board through VIN (E1) and GND (E2) terminals. Con-

nect the load to the terminals VOUT+(E3) and VOUT–(E4)

on the board.

2.Turnonthepowerattheinput.IncreaseVIN slowlyto36V.

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.

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

be regulated at 5V (±5%).

NOTE: The LT8303 requires very small minimum load

to maintain good output voltage regulation. A Zener

diode is placed on the output to clamp the voltage to

5.6V. This Zener can be replaced with a 2000Ω resistor

at the trade-off of lower efficiency.

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 (E2), or VOUT+(E3) and

VOUT–(E4) terminals. See Figure 2 for proper scope

probe technique.

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dc2490af

DEMO MANUAL DC2490A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

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

Figure 3. Efficiency vs Load Current Figure 4. Load and Line Regulation

INPUT OR OUTPUT CAPACITOR

VIN = 36V

VIN = 48V

VIN = 72V

LOAD CURRENT (mA)

100

200

300

400

500

600

700

800

900

100

EFFICIENCY (%)

DC2490a F03

= 36V

= 48V

= 72V

LOAD CURRENT (mA)

100

200

300

400

500

600

700

800

900

4.9

5.0

5.1

5.2

OUTPUT VOLTAGE (V)

DC2490a F04

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dc2490af

DEMO MANUAL DC2490A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 4.7µF, X7S, 100V, 10% 1210 MURATA, GRJ32DC72A475KE11L

2 1 C2 CAP, 220µF, X5R, 6.3V, 20% 1210 SAMSUNG, CL32A227MQVNNNE

3 1 D1 DIODE, SCHOTTKY, 30V, 3A, PowerDI123 DIODES INC, SBR3U30P1-7

4 1 D2 DIODE, ZENER, 5.6V, 300mW, SOD-523 DIODES INC, BZT52C5V6T-7

5 1 D3 DIODE, ZENER, 62V, SOD-123 CENTRAL SEMI, CMHZ5265B

6 1 D4 DIODE, 200V, SOD-123 CENTRAL SEMI, CMMR1U-02

7 1 R1 RES, 402k, 1/10W, 1%, 0603 VISHAY, CRCW0603402KFKEA

8 1 R2 RES, 15.4k, 1/10W, 1% 0603 VISHAY, CRCW060315K4FKEA

9 1 R3 RES, 316k, 1/10W, 1%, 0603 VISHAY, CRCW0603316KFKEA

10 1 T1 TRANSFORMER, PS15-109 SUMIDA, PS15-109

11 1 U1 IC, LT8303ES5#PBF, TSOT23-5 LINEAR TECHNOLOGY, LT8303ES5#PBF

Additional Demo Board Circuit Components

1 0 C3 (OPT) CAP, OPT, 1210

2 0 C4 (OPT) CAP, OPT, 1808

3 0 CIN (OPT) CAP, 10µF, ALUM, 80V

Hardware: For Demo Board Only

1 4 E1 TO E4 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

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dc2490af

DEMO MANUAL DC2490A

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

36V - 72V

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

SEE DEMO MANUAL

5.6V

+5V

BZT52C5V6T-7

OPT

1210

PS15-109

5E4

VOUT-

CIN

OPT

15.4K

R3 316K

402K

SBR3U30P1-7

CMMR1U-02

VOUT+

OPTC4

1808

4.7uF

100V

1210

220uF

6.3V

1210

CMHZ5265B

LT8303ES5

VIN 5

EN/UV

RFB

GND

SW 4

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dc2490af

DEMO MANUAL DC2490A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0716 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 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. LTC 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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