Linear Technology DC2423A Guida rapida alla configurazione

dc2423af

DEMO MANUAL DC2423A

DESCRIPTION

LTM9100

Anyside™ High Voltage Isolated Switch Controller

with I2C Command and Telemetry

Demonstration circuit 2423A showcases the LT M

9100

Isolated Switch Controller in either a typical 48V applica-

tion (–A) or in a high voltage 380V application (–B). The

board may be configured for either high side or low side

operation, dependent on the connection of external sup-

ply and load to the banana jacks. An on board capacitive

load may also be wired into the circuit. LEDs indicate the

presence of input and output voltage. The MOSFET can be L, LT, LTC, LTM, Linduino, Linear Technology and the Linear logo are registered trademarks

and QuickEval and Anyside are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

easily exchanged or replaced due to screw terminal block

mounting. Protection is also included to protect the GATE

and SENSE pins in the event of MOSFET destruction. The

circuit can be operated manually or by computer control.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2423A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VCC Input Supply Range 4.5 5 5.5 V

ICC Input Supply Current 50 mA

VLLogic Input Supply Range 3 3.3 5.5 V

UV Off Threshold

DC2423A-A 48V Input

DC2423A-B 380V Input

VUV Rising 2.518

41.8

251

2.56

43.4

261

2.598

44.9

270

UV On Threshold

DC2423A-A 48V Input

DC2423A-B 380V Input

VUV Falling 2.248

37.3

224

2.291

38.8

233

2.328

40.3

242

OV On Threshold

DC2423A-A 48V Input

DC2423A-B 380V Input

VOV Rising 1.735

69.8

420

1.770

71.8

432

1.805

73.9

444

OV Off Threshold

DC2423A-A 48V Input

DC2423A-B 380V Input

VOV Falling 1.673

67.3

405

1.733

70.3

423

1.787

73.1

440

Current Limit (Circuit Breaker) Threshold

DC2423A-A Trip Current

DC2423A-B Trip Current

RS= 0.008Ω ±1%

RS= 0.017Ω ±1%

5.57

2.62

6.25

2.94

6.94

3.27

Circuit Breaker GATE Off Delay SENSE > 50mV 440 530 620 μs

10-Bit ADC Full-Scale Voltage SENSE

ADIN, ADIN2

62.8

2.514

2.56

65.2

2.606

Timer (TMR) Delay 12 ms

Slow Start (SS) Time 56 ms

VIORM Maximum Working Insulation Voltage GND to VEE 1000

690

VDC

VRMS

Common Mode Transient Immunity 30 50 kV/µs

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dc2423af

DEMO MANUAL DC2423A

OPERATING PRINCIPLES

OVERVIEW

The LTM9100 contains an isolated DC/DC converter, deliv-

ering power to VSat 10.4V and VCC2 at 5V from the input

supply, VCC. Isolation is maintained by the separation of

GND and VEE so that significant operating voltages and

transients can exist without affecting the operation of the

LTM9100. The logic side ON pin enables or shuts down

the LTM9100. The isolated side GATE pin and MOSFET

turn on are controlled by the logic side EN input. The logic

side also has two status pins, PG for power good and

ALERT to indicate an internal fault. LEDs indicate if either

pin has been activated.

All logic side signals are referenced to the logic supply

pin VL, which may be connected to VCC or to the VLinput

by jumper (JP2) selection.

The DC2423A is designed to be used either stand-alone

or interfaced directly with a DC590 isolated serial control-

ler or a DC2026 Linduino

One. The QuickEval

™

software

may be used with either the DC590 or DC2026 (when

running the DC590 Arduino code). Example Arduino

code specifically for the DC2423A is also available for the

DC2026. The LTM9100 includes an I2C/SMBus interface

for communication to its isolated side control and status

functions, as well as ADCresults. The isolated side includes

two jumpers for selection of the I2C address.

The isolated side of the LTM9100 controls the turn-on of

an external MOSFET. The MOSFET leads are connected by

screw terminal block, and its body is screw mounted to

a heatsink and PCB. This allows the MOSFET to be easily

interchanged or replaced. The design can accommodate

TO-247 (default), TO-264, and TO-220 packages.

The demo board can be connected for either high side or

low side applications.Banana jacks are providedand clearly

labeled for voltage input and load connection depending

on the selected configuration. The line monitor jumper

(JP7) must also be configured for the same configuration

so that the LTM9100 ADC reports the proper input voltage.

LEDs indicate the presence of line voltage in blue and load

voltage in yellow once the MOSFET has been turned on.

An optional capacitive load with banana connections has

been provided on the demo board. It may be used by

externally wiring to the proper load terminals.

Transient suppression is included to protect the MOSFET

and on board load capacitor for the –B version of the

demo board. The GATE pin and SENSE+pins include

external overvoltage/overcurrent protection in the event

the MOSFET shorts either drain to gate or drain to source,

protecting the LTM9100.

The DC2423A may be configured for other input voltages

and load currents by changing a handful of components.

The assembly table located on the demo board schematic

lists the component variations between the –A and –B

versions.

JUMPERS

DC2423A contains 7 jumpers, and a 14-pin connector

for the I2C interface. The jumpers provide either pin or

function configuration, a description of jumper follows.

JP1: EEPROM Program (PG) or Write Protect (WP). For

factory use only in programming the demo board ID for

QuickEval. Default position: Not Populated.

JP2: VLSupply Jumper. May be connected to VCC input

terminal or VL(default) input terminal.

JP3: ON Jumper. Enables the LTM9100 in the ON (default)

position, and disables operation in the OFF position. The

ON terminal either monitors the state of the ON jumper,

or if the ON jumper is removed, allows the ON terminal

to be externally driven.

JP4: EN Jumper. Enables the LTM9100 GATE pin, provided

both UV and OV functions are satisfied, in the ON (default)

position, and disables GATE in the OFF position. Operation

of the GATE pin may be subsequently controlled via the

I2C interface, but the EN pin must be in the high position.

See the LTM9100 data sheet for I2C only operation. The

EN terminal either monitors the state of the EN jumper,

or if the EN jumper is removed, allows the EN terminal to

be externally driven.

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dc2423af

DEMO MANUAL DC2423A

OPERATING PRINCIPLES

JP5 & JP6: I2C Address Configuration. JP5 corresponds

to ADR0 and JP6 to ADR1. The address pins are 3-state

inputs;they can be LO (VEE), open, or HI (VCC2). The default

stuffing is LO-LO, which corresponds to a device write

address of 0010000 (20h). An address of ADR0 = LO and

ADR1 = HI puts the LTM9100 in Single-Wire Broadcast

Mode, and free-running serial data appears on SDA. See

data sheet for additional details.

JP7: Line Monitor Jumper. This jumper consists of two

shunts which can be placed in the HIGH SIDE or LOW

SIDE state as indicated. The default jumper is configura-

tion is HIGH SIDE. Improper setting will result in invalid

data representation of the input voltage at the ADIN pin.

I2C INTERFACE – J5

A simple means of exercising the I2C port is provided at

J5, to be used in conjunction with a PC and DC590 or

DC2026. The DC590 or DC2026 act as an intermediary

between DC2423A and a PC, complete with isolation.

Simply plug in the 14-wide interface cable from J5 to the

DC590 or DC2026.

The QuickEval software is found here: www.linear.com/

designtools/software.There isa ‘personality’EEPROM near

the J5 connector which is read by the DC590 or DC2026

to automatically bring up the correct software. From there,

all of the LTM9100 registers can be read from or written

to, allowing full control over all of the device’s features.

Alternatively the DC2026 may be used as a gateway for

Arduino programming, example code provided at www.

linear.com/product/LTM9100.

To connect an external I2C interface, disconnect the DC590

or DC2026 and either use pins 4 and 7 on J5 or the SCL

and SDA test points located near J5. Note that the I2C

lines are referenced to VLand GND.

SINGLE WIRE INTERFACE

Itis possibletooperate theLTM9100 autonomously yet still

retain the monitoring functions by placing it in Single-Wire

Broadcast Mode. To do this, set the I2C address jumpers

to ADR0 = LO and ADR1 = HI. A serial data stream is then

observable on the SDA pin of J5 or SDA test point near

J5. See the LTM9100 data sheet for additional details.

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dc2423af

DEMO MANUAL DC2423A

QUICK START PROCEDURE

Demonstration circuit 2423A is easy to set up and evaluate

the performance of the LTM9100. For the proper setup of

a high side 48V application using the DC2423A-A, refer to

Figure 1 and follow the procedure below. The procedure

for DC2423A-B and/or low side applications are essentially

the same, but make sure to observe proper polarities and

connections in steps 3 and 4 for the alternate configura-

tions. Also, for low side applications make sure JP7 (LINE

MONITOR) is set correctly.

1. Connect external power supply to VCC and GND.

2. Connect external power supply to VLand GND, or move

jumper JP2 to the VCC position.

3. Connectexternal power supplyfrom HIGHSIDEINPUT+

banana jack to HIGH SIDE INPUT– banana jack.

4. Connect external 48V load from HIGH SIDE LOAD+

banana jack to HIGH SIDE LOAD– banana jack. The

on-board 330μF load capacitor may be used in addition

to or as the only load. Connect banana jacks together

observing the proper polarities.

5. Turn on VCC, VL, and 48V supplies.

6. TheLTM9100 can beturned onby movingthe EN jumper

(JP4) to the ON position, or by connecting external

stimulus between EN and GND with JP4 removed. The

power good (PG) LED will light after the MOSFET is on.

7. To control the LTM9100 through I2C, install the Quick-

Eval System software on a computer with an available

USB port. The download website is www.linear.com/

software. Connect DC590 or DC2026 between the com-

puter and DC2423A, and open the QuickEval software.

If already installed, update the software to obtain the

LTM9100/DC2423A driver.

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dc2423af

DEMO MANUAL DC2423A

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.

QUICK START PROCEDURE

Figure 1. Demo Board Setup – High Side with On-Board and External Loads

3V to 5.5V

RIBBON CABLE

TO DC590

OR DC2026

–

48V

–

48V LOAD

–

dc2423a F01

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dc2423af

DEMO MANUAL DC2423A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0217 • 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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