Linear Technology DC2024A Guida rapida alla configurazione

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DEMO MANUAL DC2024A

Description

LTC4282

High Current Hot Swap Controller

with I2C Compatible Monitoring

Demonstration circuit 2024A features the LT C

4282 high

current Hot Swap controller.The LTC4282 is well suited

to high power applications because the precise monitor-

ing capability and accurate current limiting reduces the

extremes in which both loads and power supplies must

safely operate.Non-volatile configuration allows for flex-

ibility in the autonomous generation of alerts and response

to faults.The LTC4282 provides a rich set of features to

support Hot Swap applications including:

n 12-/16-Bit ADC Monitors Current,Voltage,Power and

Energy

n Controls Two Sets of Parallel MOSFETs for High Current

Applications

n I2C/SMBus Interface

L,LT ,LT C ,LT M , Linear Technology and the Linear logo are registered trademarks and

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

property of their respective owners.

n Non-Volatile Configuration and Logging Functions

n Generates Alerts on ADC Measurements Outside Limits

n Software Adjustable Current Limit with Foldback

n Three General Purpose Input/Outputs

Available in a 32-pin 5mm × 5mm QFN package,the

LTC4282 is showcased on DC2024A configured for a

12V/100A application.The DC2024A-B has an included

programming socket to allow programming an LTC4282

for prototypingpurposes priorto its permanent installation

on a PCB.The DC2024A-A does not have this socket.By

changing a few passive components, 2.9V to 30V applica-

tions can easily be evaluated.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2024A

Figure 1. Proper Measurement Equipment Setup

Test

Loads

Variable

Power

Supply

V V

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DEMO MANUAL DC2024A

Quick start proceDure

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Supply Voltage Range 2.9V to 30V

Nominal Operating Voltage 12.0V

Overvoltage Lockout Nominal 15.0V

Undervoltage Lockout Nominal 11.1V

Output Current Limit Nominal 100A

Maximum Load Capacitance Nominal 10,000µF

Timer Expiration Period Nominal 4ms

Table. Power Input and Output Connections

NOMENCLATURE CONNECTOR DESCRIPTION

12VIN E1 12V Power In

12VOUT 100A E2 12V Power Out

GND E21 (Banana) Power Supply Common

Table 2. Test Points, Turrets

NOMENCLATURE TURRET DESCRIPTION

GPIO1 E3 GPIO1 Pin I/O

VCC E4 Internal VCC

12VOUT E5 12VOUT Monitor

12VIN E6 12VIN Monitor

ON (SHORT PIN) E7 ON Pin Monitor/Input

SCL E8 I2C Serial Clock Input

GND E9, E10, E15, E17 Ground

SDA E11 I2C Serial Data Input/Output

ALERT E12 ALERT Pin

GPIO2 E13 GPIO2 Pin I/O

GPIO3 E14 GPIO3 Pin I/O

EXT 5V E16

TIMER E18 TIMER Pin

UV E19 UV Pin

OV E20 OV Pin

GATE2 E22 GATE 2 Pin

GATE1 E23 GATE 1 Pin

Table 3. LED Indicators

NOMENCLATURE LED DESCRIPTION

IN D1 (Green) Input Power Indicator

OUT D2 (Green) Output Power Indicator

GPIO1 D3 (Green) GPIO1 Logic Low Indicator

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DEMO MANUAL DC2024A

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Table 4. Jumpers

NOMENCLATURE JUMPER DESCRIPTION

CLK: INT, EXT JP1 Internal/External Clock Select

ON: INTVCC, FLOAT, GND JP2 ON Input Select, VCC, Float (External), GND

ADR0: H, NC, L JP3 Address Pin ADRO Select

ADR1: H, NC, L JP4 Address Pin ADR1 Select

ADR2: H, NC, L JP5 Address Pin ADR2 Select

WRITE PROTECT: LOCK, WRITE JP6 Write Protect for EEPROM

Operating Principles

The LTC4282 is a low voltage,high current Hot Swap

controller that has a 2.9V to 33V operating range and

a 45V absolute maximum voltage for the VDD pin.This

demo circuit is populated for 12V operation,but it can

easily be readjusted for any voltage between 2.9V and 30V

by replacing R1, R2, and R7 (top resistors in the UV/OV

divider and the FB divider). The DC2024A as supplied by

the factory is populated with a pair of PSMN1R5-30BLE

MOSFETs in D2PAK packages.A total of ten 3mΩ sense

resistors are used providing typically 100A of load cur-

rent. The current limit and circuit breaker thresholds can

be adjusted by changing the sense resistors R25, R30,

R35, R41, R47, R52, R57, R62, R67, and R72 and/or the

value of ∆VSENSE via addressable registers in the LTC4282.

Several locationsfor MOSFETpackagesas wellas additional

sense resistors are available on the front and rear of the

PCB for higher current configurations.

Quick Start Procedure (Without Software)

DC2024A is easy to set up to evaluate the performance of

the LTC4282. Refer to Figure 1for proper measurement

equipment setup and follow the procedure below.

WARNING

The DC2024A is capable of operation in excess of 100A.

At this current and power level,there is a danger of seri-

ous personal injury and equipment damage if proper

techniques are not used.All cabling between the power

supply and the load should be capable of handling the

current levels used.

Additionally, the high currents and fast transients can

cause unexpected voltage drops in cables connecting the

test equipment to the DC2024A due to parasitic resistance

and inductance.The cable drops may cause ground loops

for the current via various cables and scope probes.This

will cause unexplained ringing,distorted oscilloscope

waveforms, voltage and current spikes,and signals ap-

pearing to be below ground.

Table 5. Conectors

NOMENCLATURE CONNECTOR DESCRIPTION

DC590 J1 Connection for DC590 Aux Demo Board

DC1613 J2 Connection for DC1613 Aux Demo Board

Table 3. LED Indicators

SOCKET POWER ON D4 (Red) Programming Socket SKT1 Powered

ALERT D5 (Red) ALERT Pin Logic Low

SCL D6 (Green) Serial Clock Active

SDA D7 (Green) Serial Data Active

GPIO3 D8 (Green) GPIO3 Logic Low

GPIO2 D9 (Green) GPIO2 Logic Low

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A common sneak path for current is the third wire

grounds used on power cords of test equipment in use.

Using ground lifting connectors at the wall outlet won’t

necessarily alleviate these effects since most equipment

has line bypassing capacitors between the mains voltage

and local chassis ground.Isolating test equipment using

line isolation transformers with low primary to secondary

capacitance is recommended.Probe ground leads may

intercept induced fields from the high current paths and

should be minimized or avoided

Another method to remove these artifacts is the use of

a differential scope probe connected between the signal

to be observed and a ground connection located close to

the point of measurement.

Also be careful to not allow an open ground from the

power supply or load to cause return current through the

grounds of the various devices connected to the demo

board. This may present a fire hazard or cause damage

to the test equipment.

The DC2024A is set up to operate in a 12V system at

current levels up to 100A. At 100A, the MOSFETs are

dissipating 3.75W each and additional air flow may be

needed to keep them within safe thermal operating limits

for continuous operation.If additional current is required

without sufficient air flow,multiple MOSFETs should be

connected in parallel with the existing MOSFETs to lower

the I2R losses.

Jumper Positions

JUMPER NAME POSITION

JP1 CLK EXT

JP2 ON INTVCC

JP3 ADR0 NC

JP4 ADR1 NC

JP5 ADR2 NC

JP6 WRITE PROTECT LOCK

Powering Up

Connect power supply capable of 120A at 0V to 20V to

the 12V input as shown in Figure 1. Verify cabling shown

in extra bold lines is capable of carrying 100A safely.The

GND connection does not handle high current so no high

current cabling is required.

Generally, an electronic load will be used.If this is true,

use it in the constant resistance mode.Use in constant

current will prevent start up because of current foldback

in the LTC4282. Current foldback is used to minimize

dissipation in the MOSFETs used as pass devices with

the LTC4282. To effect this,current is initially limited to

approximately 1/3 of full limit until the output voltage is

above 10V. If a constant current load is used and set to

100A, the LTC4282 will not start up and a current fault

will be reported.

UV/OV Thresholds

With no load on the output,slowly increase the voltage

on the input to the board.Observe the input voltage when

LED D2 (OUT) illuminates.This voltage should be between

10.7Vand 11.4V.Continueincreasing thevoltage untilD2is

extinguished.Thisshould occur between14.4V and 15.3V.

Output Voltage Slew Rate

With no load connected,observe the output voltage

between turret 12VOUT (E5), and GND.Apply 12V to the

12VIN connector.The output voltage should slew from 0V

to 12V in 10ms to 25ms.

Output Current Limit

Turn off power supply and connect electronic load to the

DC2024 as shown in Figure 1. Disable electronic load.

Adjust power supply to 12V and verify its current level is

set to >120A.

Slowly increase conductance of the electronic load while

monitoring current.As the load increases to around 100A,

the output voltage and current will fall to zero.Note the

current where this occurs. This should be 95A to 105A.

Ability to Charge Output Capacitor

Turn off power supply and disconnect electronic load.

Replace load with a 10,000µF capacitor rated at 15V or

greater. Turn on power supply and observe that the output

voltage rises to 12V indicating the DC2024 has connected

tothe load andsuccessfully chargedtheoutput capacitance.

Monitor the current during the period when the capacitor

is charging, it should be a maximum of 12A.

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DEMO MANUAL DC2024A

Quick start proceDure

Software Control with LTpowerPlay™

LTpowerPlay is a convenient PC software GUI that gives

complete access to the registers of the LTC4282, and

many other Linear Technology powersystem management

parts. Use it in offline mode to build a system configura-

tion file even with no hardware plugged-in,and use it

with hardware connected to configure and debug your

application.LTpowerPlay communicates using the I2C bus

in the demo system (covered in this manual), or in your

real-worldproduct environment.It providesunprecedented

control over the Linear Technology ICs on the I2C bus.

Use it during board bring-up to tune and optimize the

power system parameters.Use it during system debug to

view critical system information and troubleshoot board

design or manufacturing issues.LTpowerPlay includes

extensive help and documentation under the help menu.

Online help includes quick start videos and tutorials,and

detailed technical documentation from the Linear Tech-

nology website.Getting started with LTpowerPlay is easy.

Simply download and install the PC software from here:

http//www.linear.com/ltpowerplay

Figure 2. DC2024A-A Demo Board Connected to DC1613 I2C-to-USB Converter

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DEMO MANUAL DC2024A

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The DC1613 USB-to-I2C adapter interfaces the PC running

LTpowerPlay to the DC2024A board.Connect the DC1613

adapter to the PC through a USB cable,and connect the

DC2024A board through the ribbon cable to connector J2.

Launch the LTpowerPlay GUI on the PC.The software

identifies the DC1613 controller,then the DC2024A board,

and begins communicating through the I2C bus with the

LTC4282. Once this communication has been established,

the GUI displays its main window (Figure 3).

The LTpowerPlay GUI divides information into separate

panes in the window.On the left is the system tree pane

(Figure 4), displaying a list of all Linear Technology devices

identified on the I2C bus.For a single LTC4282 device,

the tree is small,but if other supported devices are pres-

ent on the I2C bus,LTpowerPlay will add them.Click on

a device in this list to selectively access it.Information in

other panes pertains to the selected device.

LTpowerPlay System Tree

Figure 3. LTpowerPlay GUI Window

Figure 4. LTpowerPlay System Tree

To the right of the system tree is the configuration register

pane. The Figure 5view shows all of the writable user-

configurable registers available on the selected device.

The GUI offers clickable buttons and fields to edit the

information in these registers.

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Update register contents by clicking or typing to change

the desired registers.Then selecting the PC to RAM button

in the top toolbar (Figure 6). LTpowerPlay writes changes

to the updated registers.

Figure 5. LTpowerPlay Configuration Registers

Right of center in LTpowerPlay is the telemetry pane

(Figure 7), displaying read-only information contained in

the status registers of the selected part.The GUI periodi-

cally polls the I2C bus and updates the telemetry content,

along with a user-friendly interpretation of the bits.

Figure 6. PC to RAM Button

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Figure 7. LTpowerPlay Telemetry

In the upper right corner of LTpowerPlay is the chip dash-

boardpane (Figure8), displaying a graphical representation

of the part status in a friendly,easy-to-understand format.

The meter in the upper left of the panel displays the static

input energy to the card in watts.The small dials in the

center of the input energy meter display the energy used

in kilojoules.The VSOURCE meter displays the voltage

at the SOURCE pin of the LTC4282, which is the same

as VOUT.The Input meter displays the voltage input at

the VDD pin of the LTC4282. VSENSE indicates the input

current derived by dividing the voltage measured across

the sense resistor by the value of the sense resistor.The

power meter displays the SOURCE voltage multiplied

by the current sense voltage and scaled to indicate the

power in watts.VGPIO3displays the voltage at GPIO3

when it is configured as an analog input.The FET Status

annunciators show the status of the pass MOSFETs as

described in the FET-BAD Fault section of the data sheet.

GPIO1, GPIO2and GPIO3show the status of the general

purpose input/output pins.

On the lower right of the GUI window is the telemetry

plot pane (Figure 9). By selecting various measurement

functions in the telemetry pane,a graphic display of that

function versus time is displayed.This gives an instant

indication on how that function varies with time.

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DEMO MANUAL DC2024A

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Figure 8. LTpowerPlay Chip Dashboard

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DEMO MANUAL DC2024A

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Figure 9. LTpowerPlay Telemetry Plot

Indice

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