Linear DC2033A Quick setup guide

dc2033af

DEMO MANUAL DC2033A

Description

LT6110

Cable/Wire

Drop Compensator

The DC2033A demo board features the LT

6110 cable/

wire drop compensator IC. The LT6110 is a precision

high side current sense that monitors load current via a

sense resistor and converts the sense voltage to a sink-

ing or sourcing current. Using the LT6110 sourcing or

sinking current to control a regulator’s output voltage can

compensate for the voltage loss due to a cable/wire drop.

The LT6110 includes an internal sense resistor or can be

used with an external sense resistor.

The DC2033A is jumper-configurable for the LT6110 to

use the internal sense resistor, an external 25mΩ sense

resistor,ora5.4mΩPCBtracesenseresistor.TheDC2033A

default configuration is for the LT6110 to use the internal

sense resistor.

Design files for this circuit board are available at

http://www.linear.com/demo

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

Technology Corporation. All other trademarks are the property of their respective owners.

typical Wire Drop compensation connections

IOUT

+IN –IN

RIN

LT6110

V+

V–

IMON

–

VIN

ILOAD

IIOUT

RWIRE

(Ω)

VLOAD

CLOAD

DC2033 F01

REGULATOR

LOAD

VREG

RFA

RFB

IOUT

+IN –IN

RIN

LT6110

V+

V–

IMON

–

VIN

ILOAD

IIOUT

RWIRE

(Ω)

VLOAD

CLOAD

DC2033 F02

REGULATOR

LOAD

–

RWIRE

(Ω)

VREG

RFA

RFB

Figure 1. One Cable/Wire Compensation (One Wire to a Load Sharing the Regulator’s Ground)

Figure 2. Tw o Cable/Wire Compensation (One Wire to a Load and One Ground Return Wire)

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dc2033af

DEMO MANUAL DC2033A

Quick start setup

The Quick Start Setup of Figure 3, shows the basic con-

nections required for getting familiar with a DC2033A.

An ammeter is used to measure the load current to a 5Ω

load or an active load. To confirm the operation of the

LT6110, connect a wire jumper from VOUT1 to regulator.

This jumper connects the power supply 5V to the ROUT

100Ω pull-up resistor. The voltmeter across ROUT is for

monitoringthe IIOUT current. A DC2033Ais assembled with

a402Ω RIN1 resistor to provide quick testing convenience.

The RIN1 resistor and the VSENSE voltage set the LT6110

output current (IIOUT). To begin, adjust the power supply

for 1A load current. With 1A load current flowing through

the internal 20mΩ RSENSE resistor and 100µV VOS, the

IIOUT current is 50µA, (1A • 20mΩ + 100µV)/402Ω. The

voltmeter should read 5mV (50µA • 100Ω) ± the RSENSE,

VOS, RIN1, ROUT and IIOUT errors. Figure 4 shows the Quick

Setup schematic and IIOUT equations.

performance summary

Specifications are at TA= 25°C

PARAMETER MIN TYP MAX UNITS

Supply Range (V+to V–) 2 50 V

Amplifier Input Offset Voltage, VOS 100 300 µV

IOUT Current Error (Does Not Include VOS or RIN Errors) I+IN = 10µA

I+IN = 100µA

I+IN = 1mA

0.6

0.4

1.5

1.6

2.5

IMON Current Error (3 • I+IN) I+IN = 100µA 1.5 3 %

IOUT Voltage Range 0.4 V+V

IOUT Current Error Change for IOUT Voltage 0.4V to 3.5V 0.2 %/V

IMON Current Error Change for IMON Voltage 0V to 3.1V 0.2 %/V

IOUT Signal Bandwidth I+IN = 100µA 180 kHz

Supply Current 16 30 µA

Figure 3. Quick Start Setup

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dc2033af

DEMO MANUAL DC2033A

Quick start setup

Figure 4. DC2033A Quick Setup Circuit and Equations

Setting Up the DC2033A for Wire Compensation

Testing

The DC2033A default circuit uses the LT6110 internal

20mΩ sense resistor (RSENSE) and is configured with

0Ω RJ1, RJ2 and RJ3 are installed with 0Ω jumpers.

The RJ1 and RJ2 are standard 0Ω jumpers and con-

nect the LT6110 amplifier across the internal RSENSE.

The RJ1 and RJ2 resistance is not a concern as the

current flowing through them is very small (the resis-

tance variation of standard 0Ω resistors is 20mΩ to

100mΩ). However, a standard 0Ω jumper must not be

used in the path of the load current because the jumper's

I • R drop adds an error term to a wire drop compensation

design (for example the I • R drop of a 50mΩ jumper for

2A is 100mV). The RJ3 jumper is ultra-0Ω, with less than

1mΩ and rated for 30A at 70°C. The RJ3 jumper can be

removed and re-installed as RJ6 or RJ9, to configure the

DC2033A with an LT6110 and an external RSENSE (for an

alternative to an ultra-0Ω jumper install two 0.25 inch

length of 18AWG solid copper wires in parallel for up to

20A ILOAD).

The RIN1 resistor and the VSENSE voltage set the LT6110

output current (IIOUT) for regulator output voltage control.

The IIOUT current connects to the regulator feedback resis-

tors and boosts the regulator's output voltage (VREG). The

VREG voltage increases directly with the load current and

cancels the wire's I • R drop (VDROP) to the remote load.

A DC2033A has 0805 size pads for installing a switching

regulator's feedback resistors (RFA, RFB and RG). A low

quiescent current switching regulator has 10µA or less

current flowing through the feedback divider and requires

IOUT

+IN –IN

RIN1

402Ω

RJ10

0Ω

ROUT

100Ω

RJ1

0Ω

RJ2

0Ω

GND

E2 5Ω LOAD

0.1µF

LT6110

V+

V–

IMON

–

GND

E1 TO E5

WIRE JUMPER

REGULATOR

ILOAD

1A RJ3

0Ω

DC2033 F04

RSENSE

5V POWER

SUPPLY

IIOUT

VOUT2

IMON

VOUT1

RMON

100Ω EB

3× IIOUT

IIOUT =VOUT1 −VOUT2

ROUT

IIOUT =ILOAD •RSENSE +VOS

RIN1

ROUT =100

RIN1 =402

TYPICAL VOS =100µV

RSENSE =20mΩ, ±15%

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dc2033af

DEMO MANUAL DC2033A

three feedback resistors for an LT6110 connection, as

in Figure 1. In addition, a DC2033A includes pads for a

feedback loop compensation capacitor, C4.

A Quick Design Guide.

Variable Definitions:

ILOAD is the maximum load current and IIOUT is the LT6110

output current, (design target is 100µA).

RSENSE is the LT6110 internal or external current sense

resistor and RWIRE is the copper wire resistance.

(RWIRE includes the resistance of the load current car-

rying PCB traces and wire connectors minus the RSENSE

resistance).

VFB is the regulator's feedback reference voltage.

IQis the no-load quiescent current flowing through the

resistor feedback divider, (IQ= VFB/RG), (refer to the

regulator’s demo manual).

Quick start setup

VREG is the no-load current regulator output voltage.

Quick Design Equations:

RIN1 =

SENSE

IIOUT

VSENSE =ILOAD•RSENSE

RFA =VDROP

IIOUT

VDROP =ILOAD•(RSENSE +RWIRE)

RFB =VREG – VFB

RG=VFB

Quick Design Check:

REG

=(R

)•I

NOTE: For DC2033A REGULATOR input voltages higher

than 36V, remove the RJ10 jumper sorting the 27V Zener,

D1. Refer to the LT6110 data sheet for additional applica-

tion circuits and information.

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dc2033af

DEMO MANUAL DC2033A

applications

DC2033A Application Options

The DC2033A is designed to be used with a regulator

board and copper wire. On board jumper pads and turrets

configure an LT6110 circuit using 0Ω jumpers and provide

for wired connections to a regulator board. Figures 6, 7

and 8 show typical DC2033 application circuit options.

Table 2. DC2033A Current Sense Resistor, RSENSE and Jumper

Options

RSENSE RESISTANCE (25°C)

JUMPERS

STANDARD 0Ω

JUMPERS

ULTRA-0Ω ILOADMAX

Internal 20mΩ at ILOAD = 1A,

(16.5mΩ to 22.5mΩ

RJ1, RJ2 RJ3 3A at 125°C

LT6110

RSENSE

22mΩ at ILOAD = 3A,

(18.5mΩ to 24.5mΩ

External

REXT

25mΩ at ILOAD = 1A,

±1%

RJ4, RJ5 RJ6 6A at 70°C

5A at 90°C

External

RPCB

5.4mΩ at ILOAD = 1A,

±15%

5.7mΩ at ILOAD = 10A,

±15%

RJ7, RJ8 RJ9 20A at 25°C

10A at 90°C

The DC2033A with a Regulator Demo Board

A DC2033A board can be configured and connected to a

regulator demo board for a complete cable/wire drop com-

pensation system evaluation. Typically a regulator demo

board includes a feedback resistor divider that sets the

output voltage VREG. Remove the feedback resistors from

theregulatorboardandconnecttheregulator’sfeedbackpin

(FB or VREF) to the DC2033A VFB (E9). In addition, connect

theVOUT andGNDoftheregulatorboardto the REGULATOR

(E1) and to the GND (E3) of the DC2033A respectively.

Figure 5 shows Linear Technology’s buck regulator demo

board, DC1458A, connected to a DC2033A, using an

external sense resistor, REXT. The DC1458A demo board

includes the LT3972, 5V at 3.5A buck regulator. Figure 6

shows the complete cable/wire compensation schematic.

NOTE: The LT3972 R2 and R3 feedback resistors are re-

moved from the DC1458A board and are on the DC2033A

board (RFA, RFB and RG). The no-load LT3972 voltage is

Figure 5. DC1458A and DC2033A Connections

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dc2033af

DEMO MANUAL DC2033A

applications

Figure 6. An LT3972 5V at 3.5A Buck Regulator with LT6110 Circuit Compensating for the Drop of a 10ft, 24AWG Cable/Wire

IOUT

RFA, RFB and RG

VALUES ARE FOR

COMPENSATION OF

10ft, 24AWG WIRE

AND 5V AT 3.5A LOAD. +IN –IN

RIN

866Ω

RJ10

0Ω

ROUT

100Ω

RJ4

0Ω

RJ5

0Ω E4

GND

LOAD

0.1µF

LT6110

V+

V–

IMON

–

GND

REGULATOR

GND

VOUT

5V AT 3.5A

ILOAD

3.5A

ILOAD

3.5A RJ6

0Ω

DC2033 F06

RSENSE

RWIRE

24AWG

10ft

0.25Ω

REXT

25mΩ

IIOUT

VOUT2 E7

IMON

VOUT1

RMON

100Ω

3× IIOUT

GND

SYNC

VFB

PGOOD

LOAD

47µF

VLOAD

3.5A

RFA

9.53k

RFB

523k

100k

47pF

0.1µF

47µF

R2 R2 AND R3 ARE

REMOVED.

DC1458 TO DC2033

CONNECTIONS.

1000pF

JP2

BURST MODE

SYNC ON

100k

15k

100pF

LT3972

BUCK REGULATOR

63.4k

0.47µF

MBRA340T3

6.8µH

4.7µF

22µF

BOOST

VIN

RUN/SS

PGOOD

SYNC

LT3972EMSE

GND

JP1

100k

RUN

SHDN

EXTSS

0.22µF

VIN

GND

EXTSS

DC1458A

LT6110

WIRE DROP COMPENSATOR

DC2033A

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dc2033af

DEMO MANUAL DC2033A

applications

5V and the feedback voltage, VFB is 0.79V. The values of

the feedback resistors are selected using the Quick Design

Guide with an IQ= 8µA. The specified quiescent current is

8µA. Resistors RFA, RFB and RGare 9.53k, 523k and 100k

respectively. VREG = (9.53k+ 523k+ 100k) • 8µA= 5V

(±1% and ±1.27% resistor and VFB tolerance respectively).

The DC2033A PCB Trace RSENSE

A DC2033A has a serpentine PCB trace that can be used as

an LT6110 external sense resistor for high load currents

(5A to 20A). Remove RJ3 ultra-0Ω jumper and install as

RJ9.Remove standard 0Ω jumpers RJ1 andRJ2 and install

Figure 7. DC2033 Configured for RPCB (PCB Trace Sense Resistor)

RJ7 and RJ8. Figure 7 shows the DC2033A schematic with

LT6110 and PCB RSENSE.

The copper thickness of a DC2033A PCB trace is two

ounces. A typical resistance for a 2oz square trace is

0.25mΩ at 25°C. The RPCB serpentine trace length is six

0.15 × 0.6 inch rectangular traces connected by 0.015 ×

0.15 inch traces. The current path area of each rectangu-

lar trace is equivalent to three and one-half squares. The

RPCB resistance is 5.4mΩ at 25°C, ±15%. RWIRE is the

total resistance from the regulator output to the remote

load (minus the RSENSE resistance).

IOUT

+IN –IN

RIN1

RJ10

0Ω

ROUT

100Ω

RJ7

0Ω

RJ8

0Ω E4

GND

LOAD

0.1µF

LT6110

V+

V–

IMON

–

GND

REGULATOR

DC2033A

ILOAD

ILOAD RJ9

0Ω

DC2033 F07

RSENSE

RWIRE (WIRE RESISTANCES)

*RPCB

5.4mΩ

±15%

IIOUT

VOUT2 E7

IMON

VOUT1

RMON

100Ω

3× IIOUT

VFB

LOAD

*RPCB

CLOAD

VLOAD

RFA

RFB

REGULATOR

VREG

VIN

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dc2033af

DEMO MANUAL DC2033A

applications

The RJ9 jumper in the load current path must be ultra-0Ω,

1mΩ or less (the jumper's I • R drop adds an error term

to a wire drop compensation design). The RJ3 jumper is

ultra-0Ω, less than 1mΩ and can be removed and installed

as RJ9 (for an alternative to an ultra-0Ω jumper install two

0.25 inch length of 18AWG solid copper wires in parallel

for an RJ9 jumper).

Using the DC2033A with an LT6110 DFN Package

The bottom layer of a DC2033A is designed for an LT6110

DFN IC. To use a DC2033A for evaluating with an LT6110

DFN IC with an internal RSENSE requires the following:

Remove U1 (LT6110 SOT IC) and jumper RJ3 from the top

of the board. Install a U2 (LT6110 DFN), RJ11 and RJ12

on the bottom of DC2033A. Figure 8 shows the schematic

of a DC2033A with an LT6110 DFN package.

The DC2033A PCB layout is optimized for an LT6110

SOT23 package. A DC2033A with a LT6110 DFN (U2)

and an internal RSENSE, adds a 2% RSENSE error due to a

PCB via from the top to the bottom PCB layer. In addition

to using a DC2033A with a LT6110 DFN and an internal

RSENSE, the DC2033A can be configured for an LT6110

DFN with an external REXT or RPCB current sense resistor

(refer to the jumper table on the DC2033A schematic).

The load current path RJ6, RJ9, RJ11 and RJ12 jumpers

must be ultra-0Ω, less than 1mΩ, (for an alternative to

an ultra-0Ω jumper install two 0.25 inch length of 18AWG

solid copper wires in parallel for an RJ6, RJ9, RJ11 or

RJ12 jumper).

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dc2033af

DEMO MANUAL DC2033A

Figure 8. DC2033 Configure with an LT6110 DFN Package and Internal RSENSE

applications

IOUT

+IN –IN

RIN1

RJ10

0Ω

ROUT

100Ω

RJ1

0Ω

RJ2

0Ω

GND

LOAD

0.1µF

LT6110

V+

V–

IMON

–

GND

REGULATOR

DC2033A

ILOAD

ILOAD RJ12

0Ω

DC2033 F08

RSENSE

RJ11

0Ω

RWIRE

0Ω

GND

REGULATOR

IIOUT

VOUT2 E7

IMON

VOUT1

RMON

100Ω

3× IIOUT

VFB

LOAD

CLOAD

VLOAD

RFA

RFB

REGULATOR

VREG

VIN

dc2033af

DEMO MANUAL DC2033A

parts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 0 C1, C4 CAP, X7R, 50V, 10%, 0603 OPT

2 1 C2 CAP, X7R, 0.1µF, 50V, 10%, 0603 TDK C1608X7R1H104K

3 0 C3 CAP, X7R, 50V,1206 OPT

4 1 D1 DIODE, ZENER 27V 200MW SOD-323 DIODES/ZETEX, BZT52C27S-7-F

5 4 E5, E6, E7, E9 TESTPOINT, TURRET, 0.063" MILL-MAX, 2308-2-00-80-00-00-07-0

6 5 E1 TO E4, E8 TESTPOINT, TURRET, 0.093" MILL-MAX, 2501-2-00-80-00-00-07-0

7 1 REXT CURRENT SENSE RESISTOR 0.025Ω 1% 2512 VISHAY, WSL2512R0250FEA18

8 0 RIN2, RG, RFA, RFB RES, CHIP, 1%, 1/8W, 0805 OPT

9 1 RIN1 RES, CHIP, 1%, 1/8W, 402Ω, 0805 VISHAY, CRCW0805402RFKEA

10 3 RJ1, RJ2, RJ10 RES, 0Ω JUMPER, 0805 VISHAY, CRCW08050000Z0EA

11 0 RJ4, RJ5, RJ7, RJ8 RES, 0Ω JUMPER, 0805 OPT

12 1 RJ3 RES, ULTRA-0Ω JUMPER, 2512 NACOMA/TEPRO RN5326

13 0 RJ6, RJ9, RJ11, RJ12 RES, ULTRA-0Ω JUMPER, 2512 OPT USE TWO 0.25in,18AWG SOLID COPPER WIRES IN

PARALLEL

14 2 ROUT, RMON RES, CHIP, 1%, 1/8W, 100Ω, 0805 VISHAY, CRCW0805100RFKEA

15 0 RPCB RES PCB TRACE, 5.4mΩ, ±15% (PCB TRACE RESISTOR)

16 1 R1 RES, CHIP, 1%, 1/8W, 1k, 0805 VISHAY, CRCW08051K00FKEA

17 1 U1 IC, WIRE DROP COMPENSATOR, TSOT-23-8 LINEAR TECHNOLOGY, LT6110ITS8#PBF

18 0 U2 IC, WIRE DROP COMPENSATOR, 8 LEAD DFN, OPT

19 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE, 8831

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