Linear Technology DC1886A Kurzanleitung zur Einrichtung

dc1886af

DEMO MANUAL DC1886A

Description

LTC4232:

5A Integrated

Hot Swap Controller

Demonstration circuit 1886A features the LTC4232 5A

Integrated Hot Swap™ Controller. The LTC4232 is ideally

suited for demanding power distribution control in 2.9V

to 15V applications for hot board insertion protection,

high side power switching, and electronic circuit breaker

functions. The LTC4232 provides a rich set of features to

support Hot Swap applications including:

• 2%accurateundervoltageandovervoltageprotection

• Overtemperatureprotection

• Adjustableinrushcurrentcontrol

• Adjustable,10%accuratecurrentlimitwithprogram-

mable cutout time

performance summary

• Programmableoutputvoltageramprate

• Configurableforauto-retryorlatchoffonovercurrent

faults

• Powergoodandfaultoutputs

Available in a 16-lead 5mm × 3mm DFN package, the

LTC4232 is showcased on demonstration circuit 1886A,

configured for a 12V application. By changing a few pas-

sive components, 2.9V to 15V applications can easily be

evaluated.

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 and

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

property of their respective owners.

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VDD Input Supply Range 2.9 15 V

dVGATE/dt GATEPinTurn-OnRampRate 0.15 0.3 0.55 V/ms

RON MOSFET+SenseResistorOn-Resistance 15 33 50 mΩ

ILIM(TH) Current Limit Threshold VFB = 1.23V 5.0 5.6 6.1 A

ILIM(TH) Current Limit Threshold VFB=0V

VFB = 1.23V, RSET=20k

1.2

2.6

1.5

2.9

1.8

3.3

VTH OV,UV,FBPinThresholdVoltage VIN Rising 1.21 1.235 1.26 V

VUV(RTH) UVPinResetThresholdVoltage VUV Falling 0.55 0.62 0.7 V

VFB(HYST) FBPinPowerGoodHysteresis 10 20 30 mV

VTIMER(H) TIMERPinHighThreshold VTIMER Rising 1.2 1.235 1.28 V

VTIMER(L) TIMERPinLowThreshold VTIMER Falling 0.1 0.21 0.3 V

ITIMER(UP) TIMERPinPull-UpCurrent VTIMER=0 –80 –100 –120 µA

ITIMER(DN) TIMERPinPulldownCurrent VTIMER = 1.2V 1.4 2 2.6 µA

IGATE(UP) GatePull-UpCurrent GateDriveOn,VGATE = VOUT = 12V –18 –14 –29 µA

tD(AUTO-RET) Auto-RetryTurn-OnDelay 50 100 150 ms

dc1886af

DEMO MANUAL DC1886A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit 1886A is easy to set up to evalu-

ate the performance of the LTC4232. Refer to Figure 1

for proper measurement equipment setup and follow the

procedure below.

Demonstration Circuit 1886A has two user configurable

jumperoptions:

• JP1TIMERDURATION:Setto2msfortheinternal2ms

timer or 12ms determined by C1. C1 may be replaced

for other timer durations. (Default position: 12ms)

• JP2AUTORETRY:SettoONforauto-retryorOFFfor

latchoffonovercurrentfaults.(Defaultposition:OFF)

–

ADJ

POWER SUPPLY +–

TEST LOADS

dc1886af

DEMO MANUAL DC1886A

Quick start proceDure

LEDs indicate the state of input power, output power, FAULT

andPG.LoadcurrentcanbemonitoredontheIMON turret,

whichhasagainof0.4V/AdeterminedbyRMON(20k).

Setanadjustablepowersupplycapableofsupplying10A

to 12V. Turn off power and connect the supply to the VDD

and GND turrets.

Connect a suitable load to the VOUT and GND turrets. This

load can be an electronic load or power resistors capable

ofdissipating100W.

NOTE:BecausetheLTC4232incorporatesfoldbackcur-

rent limiting, the nominal start-up current supplied to the

load is 1.5A and can be as low as 1.2A. This current limit

increaseslinearlyuntiltheFBpinexceeds0.6V(VOUT >

5.1V). An electronic constant current load set to 1.5A will

not permit the circuit to turn on unless it is gated on by the

PGsignal(aswouldbethecasewithaDC/DCconverter

controlledbythePGsignal).Resistiveloadingwillnot

have this problem.

Turn on the power supply, verify the input voltage is 12V.

Verify the output voltage and the load current, D2 and

D4 should both be lit (input voltage and output voltage,

respectively) and both D3 (F LT )andD5(PG)shouldbe

off.Onpower-up,observetheslopeofVOUT. This should

beintherangeof0.15to0.55V/ms,correspondingtoa

ramp-uptimeof22msto80msto12V.Withthecircuit

functioning, additional evaluations can now be performed.

OV/UV/PGthresholds:Settheinputsupplytozeroand

ramp the voltage slowly, observing the following events.

Above10.3V,thecircuitwillbeoutofUVlockoutandthe

outputshouldramp-up,lightingD4.Above10.9VtheFB

pinwillbepastitsthreshold,assertingthePGpinhighand

extinguishing D5. Increasing the supply past 15.8V will

engageOVlockout;D4willextinguishandD5willlight.

Note that the voltages indicated in this step are maximums,

taking into consideration the tolerances of the resistors

and the LTC4232 inputs.

CurrentLimitThresholds: With theinputsupply set to

12V, load the output with a 2.5Ω power resistor capable of

dissipating60W.Powershouldremainon,asthecurrent

willbebelowthe5.0Aminimumcurrentlimitthreshold.

Next,loadtheoutputwitha1.8Ωpowerresistor.Power

should be interrupted, as the current will be above the

6.1A maximum current limit threshold.

dc1886af

DEMO MANUAL DC1886A

Quick start proceDure

Inrushintocapacitiveload:Oneofthemainfunctionsof

a hot swap circuit is to provide controlled ramp-up into a

capacitive load to avoid disturbing the input power supply.

Forthefollowingtests,ensurethattheAUTORETRYjumper

issettoOFFandtheTIMERDURATIONjumperissetto

12ms. To guarantee that current limit is never reached

during ramp-up into a capacitor, the current must be less

than the minimum current limit threshold of 1.2A when

thegateramprateisatitsmaximumvalueof0.55V/ms.

(Note that the minimum current limit threshold occurs

whentheFBpinisatzero.)

 C=I/(dV/dt)=1.2A/(0.55V/ms)=2182µF

Thus, the circuit will always power up successfully with a

2000µFcapacitoratVOUT, and observation of the TIMER

turret post will show that it never begins to ramp. Figure 2

showssuccessfulramp-upintoa1200µFcapacitor.Inrush

current is determined by ramp rate alone.

It is more complicated to find the smallest capacitor that is

guaranteed to prevent successful ramp-up, since the cur-

rent into the load capacitor is afunction of the scaled output

voltage at the FB pin. As a starting point, the minimum

ramprateof0.15V/msshouldproduceacurrentgreater

than the maximum current limit threshold of 1.8A (when

FBisatzero)toensurethatthetimerbeginstorampas

soon as the output begins to rise.

 C=I/(dV/dt)=1.8A/(0.15V/ms)=12000µF

Figure 2. Successful Ramp-Up into 1200µF

IOUT

1A/DIV

VOUT

5V/DIV

TIMER

1V/DIV

dc1886af

DEMO MANUAL DC1886A

Quick start proceDure

ObservationoftheTIMERpinwillshowthatitbeginsto

ramp as soon as the output begins to ramp. At this ramp

rate, the output voltage will only be at 1.8V after 12ms,

andhencetheFBpinwillbeat0.21V,abovethepointat

which the current limit threshold begins to increase. If the

ramp-up becomes limited by the slew rate of the gate pin,

the output voltage will continue to rise and successfully

power up. However, if the ramp-up continues to be limited

by the current limit threshold, the timer will expire. Figure 3

showsunsuccessfulramp-upintoan8000µFcapacitor.

CurrentreachestheinitiallimitwhenFBisatzero.Once

FB rises above approximately 100mV the current (and

hence the output ramp rate) increases, however the timer

expires before the output reaches its final value.

The correct way to ensure successful power-up into an

output capacitance greater than 2000µF is to reduce

the ramp rate by installing a 1k resistor and a suitable

capacitor for RGATE and CGATE following the procedure in

the data sheet. Increasing the timer duration carries the

riskofexceedingtheSafeOperatingArea(SOA)ofthe

internalMOSFET.

Circuit Testing Notes: As in all high current testing, it is

agoodideatousetwistedpairpowerleadstominimize

circuitinductance.Understeploadssignificantvoltage

spikes can occur as a result of this inductance causing

false overvoltage or undervoltage trips. If there is sig-

nificant lead length between the power supply and the

DC1886A, add additional bulk capacitance across the VIN

and GND turrets. This capacitance may also be needed if

stepping the load results in significant voltage steps on

the input, particularly if performing tests of the circuit

breaker function.

Figure 3. Unsuccessful Ramp-Up into 8000µF

IOUT

1A/DIV

VOUT

5V/DIV

TIMER

1V/DIV

dc1886af

DEMO MANUAL DC1886A

schematic Diagram

D D

C C

B B

A A

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0402.

2ms 12ms

TIMER

OFF ON

AUTORETRY

DURATION

VOUT

VDD

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LTC4232IDHC

09/08/2011, 11:34 AM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LTC4232IDHC

09/08/2011, 11:34 AM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LTC4232IDHC

09/08/2011, 11:34 AM 1 1

5A INTEGRATED HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

N/A

DEMO CIRCUIT 1886A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE

109-08-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE

109-08-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE

109-08-11

RSET

OPT

0805

RSET

OPT

0805

R10

226k

R10

226k

3.3k

1uF

25V

1uF

25V

E10

ISET

E10

ISET

GND

3.3k

LN1351C

(GREEN)

LN1351C

(GREEN)

2 1

150k

COUT2

OPT

COUT2

OPT

0.1uF

16V

0.1uF

16V

JP1JP1

CGATE

OPT

CGATE

OPT

20k

JP2JP2

LTC4232IDHC

FLT

IMON 14

VDD

TIMER

INTVCC

ISET 15

PG 11

GATE 10

FB 13

OUT 9

GND

VDD

16 OUT 8

OUT 7

SENSE

FLT

RMON

20k

0805

RMON

20k

0805

3.3k

20k

CIN1

OPT

CIN1

OPT

E12

INTVCC

E12

INTVCC

LN1351C

(GREEN)

LN1351C

(GREEN)

2 1

LN1251C

(RED)

LN1251C

(RED)

2 1

SMAJ22A

2 1

3.3k

VDD

12V

VDD

12V

E11

IMON

E11

IMON

20k

LN1251C

(RED)

LN1251C

(RED)

2 1

140k

RGATE

OPT

RGATE

OPT

TIMER

OV E6

GND

E2 VOUT

12V / 5A

E2 VOUT

12V / 5A

COUT1

22uF

25V

7343

COUT1

22uF

25V

7343

dc1886af

DEMO MANUAL DC1886A

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.

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

10RGATE, CGATE CAP.,0603 OPT

20 CIN1,COUT2 CAP.,SANYO\16X25\H OPT

3 1 COUT1 CAP.,TANT,22µF25V,20%,7343 AVX,TPSD226M025R0200

4 1 C1 CAP.,X5R,1µF25V,0603 AVX,06033D105KAT2A

5 1 C2 CAP.,X5R,0.1µF25V,0603 AVX,06033C104KAT2A

6 1 D1 DIODE,400WTRANSIENTVOLTAGESUPPRESSOR,SMA-DIODE DIODESINC.,SMAJ22A

72 D2, D4 LED, SMT, GREEN PANASONIC,LN1351C-(TR)

8 2 D3, D5 LED, SMT, RED PANASONIC,LN1251C-(TR)

9 4 E1, E2, E3, E4 TURRET,TESTPIN,.094" MILL-MAX,2501-2-00-80-00-00-07-0

10 8 E5-E12 TURRET,TESTPIN,.064" MILL-MAX,2308-2-00-80-00-00-07-0

11 2 JP1,JP2 JMP,HD1X3,.079CC SAMTEC,TMM-103-02-L-S

12 1 RMON RES.,CHIP,20K,1/16W,5%,0805 YAGEO,RC0805JR-0720KL

13 0RSET RES.,CHIP,0805 OPT

14 4 R1, R2, R3, R5 RES.,CHIP,3.3K,1/16W,5%,0603 YAGEO,RC0603JR-073K3L

15 1 R4 RES.,CHIP,150K,1/16W,5%,0603 YAGEO,RC0603JR-07150KL

16 3 R6,R7,R8 RES.,CHIP,20K,1/16W,5%,0603 YAGEO,RC0603JR-0720KL

17 1 R9 RES.,CHIP,140K,1/16W,5%,0603 YAGEO,RC0603JR-07140KL

18 1 R10 RES.,CHIP,226K,1/16W,5%,0603 YAGEO,RC0603JR-07226KL

19 1 U1 I.C., LTC4232IDHC, DFN16DHC LINEAR TECH., LTC4232IDHC

20 1SHUNT,0.079"CENTER SAMTEC,2SN-BK-G 325

dc1886af

DEMO MANUAL DC1886A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2012

LT 0312 • PRINTED IN USA

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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

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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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630McCarthyBlvd.

Milpitas,CA95035

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