Analog Devices Linear ADI Power SCP-LT8618-BEVALZ Kurzanleitung zur Einrichtung

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

DESCRIPTION

Demonstration circuit SCP-LT8618-BEVALZ is a high effi-

ciency 60V, 1 0 0 m A s y n c h r o n o u s s t e p -down regulator. The

wide input range also allows output voltage inversion by

using the SCP-LT8618-IEVALZ version of this board.

Like all boards in the Signal Chain Power series, this board

is designed to be easily plugged into other SCP boards to

form a complete signal chain power system, enabling fast

evaluation of low power signal chains. To evaluate this

board, some universal SCP hardware is required, namely:

SCP-INPUT-EVALZ SCP-FILTER-EVALZ

SCP-OUTPUT-EVALZ SCP-1X2BKOUT-EVALZ

SCP-1X5BKOUT-EVALZ SCP-5X1-EVALZ

SCP-THRUBRD-EVALZ

To properly evaluate SCP series demo boards, you will

need the SCP Configurator companion software. SCP

Configurator can help you choose the right board and to-

pology for your design.

Note that this Demo Manual does not cover details im-

portant to the operation and configuration regarding the

LT8618. Please refer to the LT 8 6 1 8 d a t a s h e e t for a com-

plete description of the part.

Design files for this circuit board are available.

All registered trademarks and trademarks are property of their respective owners.

Table 1.

Performance Summary

SYMBOL

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

IN(MAX)

Max Input Voltage

OUT(MAX)

Max Output Voltage

OUT(MAX)

Max Output Current

100

BOARD IMAGE

Figure 1. SCP-LT 8 6 1 8 -BEVALZ Evaluation Board

DEMO MANUAL

SCP-LT8618-BEVALZ

Signal Chain Power Series

LT8618 High Efficiency

Synchronous Buck Converter

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

QUICK START PROCEDURE

Demonstration circuit

SCP-LT8618-BEVALZ

is easy to

set up to evaluate the performance of any SCP hard-

ware configuration.

1. The SCP-LT8618-BEVALZ ships with a default output

voltage of 5V. To change the output voltage, see “Con-

figuration Settings” section, and modify the board ac-

cordingly. Be sure to check for open connections or sol-

der shorts after making any modifications.

2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-

EVALZ boards to the SCP-LT8618-BEVALZ (refer to Fig-

ure 2) and connect the input board to a voltage source,

SOURCE

. Connect the output board to a voltmeter or

dynamic load. Slowly raise the input voltage until the

SCP-LT8618-BEVALZ powers up into regulation and

sweep V

SOURCE

through the desired range of operation.

NOTE: Make sure that the input voltage is always within

spec. If using a dynamic load to measure output volt-

age, make sure the load is initially set to zero.

3. Check for proper output voltage. The output should be

regulated at the programmed value (±5%).

4. Once the proper output voltage is established, power

off V

SOURCE

and similarly test other boards in the SCP

system until all elements have been individually verified

prior to assembling into the final circuit configuration.

NOTE: When measuring the input or output voltage rip-

ple, use the optional SMA connector locations available

on the input, output, 1

5, 1

2, and 5

1 breakout

boards. Avoid using the test point connections with

long scope leads.

Figure 2. Proper Measurement Equipment Setup (Use SMA connectors for Measuring Input or Output Ripple)

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

CONFIGURATION SETTINGS

Demonstration circuit SCP-LT8618-BEVALZ is a high effi-

ciency 65V, 100mA synchronous step-down regulator. The

wide input range also allows output voltage inversion by

using the SCP-LT8618-IEVALZ version of this board.

The output of the SCP-LT8618-BEVALZ is resistor-pro-

grammable from 0.8V to 48V. T h e b o a r d c a n b e also con-

figured to drive VIOC-capable linear regulators.

OUTPUT VOLTA G E PROGRAMMING

Table 2.

Resistor Selection Guide for Common Output Voltages

OUT

(V)

(Ω)

0.8

3.24k

115k

0.9

3.83k

137k

1.0

102k

357k

1.1

42.2k

102k

1.2

102k

187k

1.25

162k

267k

1.5

205k

221k

1.8

1.00M

768k

2.0

1.15M

732k

2.5

1.47M

665k

3.0

1.02M

357k

3.3

590k

182k

3.5

357k

102k

4.0

422k

102k

4.5

511k

107k

5.0

1.02M

187k

5.5

698k

115k

6.0

1.13M

169k

6.5

787k

107k

7.0

1.50M

187k

7.5

1.27M

147k

8.0

1.30M

140k

12.0

1.47M

102k

16.0

1.50M

76.8k

20.0

1.50M

60.4k

24.0

1.50M

49.9k

30.0

1.50M

40.2k

36.0

1.50M

33.2k

42.0

1.50M

28.0k

48.0

1.50M

24.9k

EN/UV PIN CONFIGURATION

The EN/UV pin is tied to the optional SCP Run/Sequence

header P1. To create a harness for this function, use Molex

part 0510650300 with crimp pin 50212-8000.

To use an active run signal, use a 1.00M resistor for either

pull-up or pull-down resistors R1 and R6, short R11 with

, and use the drive signal from connector P1. Also,

short R12 with 0

for output voltage monitoring.

If precision UVLO operation is desired, program enable di-

vider R1 and R6 such that:

R6 is 10k to 100k, nominal

The LT8618 has an accurate 1.05V threshold which places

the part into under voltage lockout. The hysteresis thresh-

old on the rising edge is typically 50mV and scales by the

factor:

VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC)

IMPLEMENTATION

To implement the VIOC function for this regulator, set R8

and R13

to 0

, respectively. Refer to the “Configuration

Settings” section in the Demo Manual for the low-dropout

(LDO) linear regulator board and use the following config-

uration for this board.

Table 3.

VIOC Cross-Reference Designators

VIOC SETTING REFERENCES

BOT

TOP

MAX

OUT

Reference Designators

SINK

is the current through R

MAX

, typically 15µA, so R

BOT

should be sized such that the divider current runs a mini-

mum of 100µA to minimize the I

SINK

error term.

VOUT =0 .7 7 8 V 1 +R4

⎛

⎝

⎜⎞

⎠

⎟

R1 =R6 VIN −1 .0 5 V

1 .0 5 V

⎛

⎝

⎜⎞

⎠

⎟

VHYST =50mV R1+R6

VL DOIN −VL DOOUT =VVIOC =0 .7 7 8 V RBOT +RTOP

RBOT

⎛

⎝

⎜⎞

⎠

⎟

VMAX

( )

LDOIN =0 .7 7 8 V RBOT +RTOP +RMAX

RBOT

⎛

⎝

⎜⎞

⎠

⎟+ISINKRMAX

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

FREQUENCY PIN CONFIGURATION

The LT8618 allows the user to program an operating fre-

quency by a single resistor. The default operating fre-

quency is 2.0MHz. Note that changing the switching fre-

quency may affect other parameters and likely necessi-

tates a change in inductor and compensation component

values. Contact the SCP team for applications support if

shifting the switching frequency greater than ±10%.

Table 4.

Resistor Selection Guide for Switching Frequency Setting

(Ω)

200kHz

221k

1.30MHz

30.1k

300kHz

143k

1.40MHz

27.4k

400kHz

110k

1.50MHz

25.5k

500kHz

86.6k

1.60MHz

23.7k

600kHz

71.5k

1.70MHz

22.1k

700kHz

60.4k

1.80MHz

20.5k

800kHz

52.3k

1.90MHz

19.1k

900kHz

46.4k

2.00MHz

18.2k

1.00MHz

40.2k

2.10MHz

16.9k

1.10MHz

36.5k

2.20MHz

16.2k

1.20MHz

33.2k

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

PARTS LIST

ITEM

QTY

REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

PCB

PRINTED CIRCUIT BOARD

ANALOG DEVICES 08_059761a

CAP 22uF 63V ALUM 8x10.5

SUN ELECTRONIC 63CE22BSA

CAP 1uF 100V CER, X7R 1206

TAIYO YUDEN HMK316B7105KL-T

CAP 0.1uF 100V CER X7R 0603

SAMSUNG CL10B104KC8NNNC

CAP 47nF 50V CER X7R 0603

KEMET C0603X473K5RACTU

CAP MLCC 0603 (Note 1)

N/A

CAP 10uF 50V X5R 1206

SAMSUNG CL31A106MBHNNNE

CAP 1uF 10V X7R 0603

SAMSUNG CL10B105KP8NNNC

CAP 10nF 50V CER X7R 0603

YAGEO CC0603KRX7R9BB103

CAP 4.7uF 50V CER X7R 1206

SAMSUNG CL31B475KBHNNNE

INPUT

CONN MALE 3POS 2.54MM PITCH R/A

SULLINS PBC03SBAN

IND 33uH 0.42A 0.66OHM

WURTH ELEKTRONIK 44031330

OUTPUT

CONN FEMALE 3POS 2.54MM PITCH R/A

SULLINS PPPC031LGBN-RC

CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY

STRAIGHT 2MM PITCH (Note 1)

MOLEX 53253-0370

RES 1M 1%THICK FILM 0805

YAGEO RC0805JR-071ML

R6, R8, R10,

R11, R12, R13

RED THICK FILM 0805 (Note 1)

N/A

R14, R15, R16

RES 0 OHM 1% 3/4W 0612

VISHAY RCL06120000Z0EA

R17, R18

RES THICK FILM 0612 (Note 1)

N/A

RES 18.2K 1% THICK FILM 0805

PANASONIC ERJ-6ENF1822V

RES 49.9K 1% THICK FILM 0805

PANASONIC ERJ-3EKF4992V

RES 1M 1% THICK FILM 0805

PANASONIC ERJ-6ENF1004V

RES 187K 1% THICK FILM 0805

PANASONIC ERJ-6ENF1873V

R7, R9

RES 0-OHM 1%THICK FILM 0805

VISHAY CRCW08050000Z0EA

IC-ADI HIGH EFFICIENCY 60V/100MA SYNCHRONOUS BUCK

ANALOG DEVICES LT 8 6 1 8 E D D B # P B F

VIOC

CONN FEMALE 2POS 2.54MM PITCH R/A

SULLINS PPPC021LGBN-RC

Note 1.

These items are not stuffed (DNI).

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

SCHEMATIC DIAGRAM

LT8618 BUCK

22UF 0.1UF

100V

DNI

0.047UF

10UF

49.9K

50V

DNI

4.7UF

50V

33UH

10V

DNI

50V

0.01UF

187K

18.2K

50V

LT8618EDDB#PBF

1MEG

DNI

63V

PPPC021LGBN-RC

PBC03SBAN

1UF

PPPC031LGBN-RC

53253-0370

DNI

DNI 1UF

DNI

1MEG

100V

A SERQUINA

02_059761 A

1:1

HW TYPE : Customer Evaluation

Product(s): LT8618

: LT8618

<DESIGN_VIEW>

R11

C8C7

C6 C9

INPUT

OUTPUT

VIOC

R18

R17

R14

R12 R13

R10

R16

R15

VPOS

BIAS

VIOC

VNEG

RUN

VNEG

V+

VO-

VO+

RUN

GND

VO+

VNEG

VIOC

VO-

GND

BIAS

PAD

GND

EN/UV

VIN

TR/SS

FB/OUT

BIAS

INTVCC

BST

THIS DRAWING IS THE PROPERTY OF ANALOG DEVICES INC.

IN PART, OR USED IN FURNISHING INFORMATION TO OTHERS,

OR FOR ANY OTHER PURPOSE DETRIMENTAL TO THE INTERESTS

THE EQUIPMENT SHOWN HEREON MAY BE PROTECTED BY PATENTS

IT IS NOT TO BE REPRODUCED OR COPIED, IN WHOLE OR

DRAWING NO.

SCALE

SIZE

REV

SHEET

APPROVED

DESCRIPTION

REVISIONS

OL G

OWNED OR CONTROLLED BY OWNED ANALOG DEVICES.

OF ANALOG DEVICES.

SCHEMATIC

PTD ENGINEER

DESIGN VIEW

REV DATE

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Speciﬁcations

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Speciﬁcations

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

DEMO MANUAL SCP-LT8618-BEVALZ

Rev. 0

1/21

www.analog.com

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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