Linear Technology LTC4227-1 Guía de configuración rápida

dc1625af

DEMO MANUAL DC1625A

Description

LTC4227-1/LTC4227-2

Dual Ideal Diode and

Single Hot Swap Controller

Demonstration circuit 1625A is intended to demonstrate

performance of the LTC4227-1/LTC4227-2 dual ideal diode

and Hot Swap™ controller. Each rail has an individual

ideal diode. Ideal diode outputs are connected to the load

through a single Hot Swap circuit.

The DC1625 allows verifying the LTC4227 Hot Swap and

ideal diode functionality during individual supply ramp-up

and ramp-down transients, during power supply shifting

(transferring) transients, steady state, and overcurrent

fault conditions.

Each DC1625A rail circuit is assembled to operate over

the full operating voltage range of the LTC4227: 2.9V to

18V, with a 7.6A maximum current load.

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.

perForMAnce sUMMArY

The board’s main components include the LTC4227 con-

troller, two power MOSFETs controlled as ideal diodes and

one power MOSFET controlled as a Hot Swap device, two

jumpers for enabling the second ideal diode (D2ON_SEL)

and Hot Swap controller (HS_ON), two LEDs to indicate

power good (PWRGD) and fault (FAULT) conditions, seven

banana jacks forconnecting power suppliesand load, many

turrets and pads for observing circuit signals.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Supplies

VIN Input Supply Range 2.9 18.0 V

VINTVCC Internal Regulator Voltage 4.5 55.6 V

VINTVCC(UVL) Internal VCC Undervoltage Lockout INTVCC Rasing 2.1 2.2 2.3 V

Ideal Diode Control

ΔVFWD(REG) Forward Regulation Voltage (VINN – VSENSE)10 25 40 mV

ΔVDGATE External N-Channel Gate Drive

(VDGATEN - VINN)

IN < 7V, ΔVFWD = 0.1V

IN = 7V to 18V, ΔVFWD = 0.1V

ICPO(UP) CPONPull-Up Current CPO = IN = 2.9V

CPO = IN = 18V

120

110

µA

IDGATE(FPU) DGATENFast Pull-Up Current ΔVFWD = 0.2V, ΔVDGATE = 0V, CPO = 17V 0 –1.5 A

IDGATE(FDU) DGATENFast Pull-Down Current ΔVFWD = –0.2V, ΔVDGATE = 5V 1.5 A

IDGATE2(DN) DGATE2 Off Pull-Down Current D2ON = 2V, ΔVDGATE2 = 2.5V 40 100 200 µA

tON(DGATE) DGATENTurn-On Delay ΔVFWD = 0.2V, CGATE = 10nF 0.25 0.5 µs

tOFF(DGATE) DGATENTurn-Off Delay ΔVFWD = –0.2V, CGATE = 10nF 0.2 0.5 µs

tPLH(DGATE2) D2ON Low to DGATE2 High 40 100 µs

Hot Swap Control

ΔVSENSE(CB) Circuit Breaker Trip Sense Voltage

(VSENSE+ - VSENSE–)

47.5 50 52.5 mV

ΔVSENSE(ACL) Active Current Limit Sense Voltage

(VSENSE+- VSENSE–)

60 65 70 mV

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dc1625af

DEMO MANUAL DC1625A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

ΔVHGATE External N-Channel Gate Drive (VHGATE - VOUT) IN < 7V, I = 0, –1μA

IN = 7V to 18V, I = 0, –1μA

4.8

IGATE(UP) External N-Channel Gate Pull-Up Current Gate Drive On, HGATE = 0V 7 10 13 µA

IHGATE(DN) External N-Channel Gate Pull-Down Current Gate Drive Off, OUT = 12V, HGATE = OUT + 5V 150 300 500 µA

IHGATE(FPD) External N-Channel Gate Fast Pull-Down

Current

Fast Turn-Off, OUT = 12V, HGATE = OUT + 5V 100 200 300 mA

Input/Output Pin

VSENSE+(UVL) SENSE+Undervoltage Lockout SENSE+Rising 1.75 1.9 2.05 V

VON(TH) ON Pin Threshold Voltage ON Rising 1.21 1.235 1.26 V

VON(RESET) ON Pin Fault Reset Threshold Voltage ON Falling 0.55 0.6 0.65 V

VD2ON(TH) D2ON Pin Threshold Voltage D2ON Rising 1.21 1.235 1.26 V

VTMR(TH) TMR Pin Threshold Voltage TMR Rising

TMR Falling

1.198

0.15

1.235

0.2

1.272

0.25

ITMR(UP) TMR Pull-Up Current TMR = 1V, In Fault Mode 75 100 125 µA

ITMR(DN) TMR Pull-Down Current TMR = 2V, No Faults 1.4 22.6 µA

ITMR(RATIO) TMR Current Ratio ITMR(DN)/ ITMR(UP) 1.4 22.7 %

perForMAnce sUMMArY

operAting principles

The LTC4227 is intended to build a combination of the

two diode-OR circuits (for two rails) and common single

Hot Swap path for inrush current limiting and overcurrent

protection.

The LTC4227 regulates the forward voltage drop across

the MOSFETs to ensure smooth current transfer from one

supply to other without oscillation. A fast turn-on reduces

the load voltage droop during supply switchover. If the

input supply fails or is shorted, a fast turn-off minimizes

reverse current transients.

The Hot Swap fast acting current limit and internal timed

circuit breaker protect circuit components when a short-

circuit fault occurs.

The Hot Swap function on the LTC4227 controller has

independent on/off control.

Each ideal diode MOSFET is activated from individual

charge pump sources and the second ideal diode path

has additional on/off control.

The LTC4227-1 features a latch-off circuit breaker, while

the LTC4227-2 provides automatic retry after a fault.

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dc1625af

DEMO MANUAL DC1625A

qUick stArt proceDUre

Demonstration circuit 1625A is easy to set up to evalu-

ate the performance of the LTC4227. Refer to Figure 1

for proper measurement equipment setup and follow the

procedure below:

The DC1625A testincludes independenttest ofthe LTC4227

hot swapping functionality and ideal diode functionality.

HOT SWAP FUNCTIONALITY TEST

This test is performed with singe rail operation, when

the rail output is provided through two series connected

MOSFETs. One MOSFET functions as an ideal diode and

other one as a Hot Swap circuit component.

The parameters of the three transients in different opera-

tion modes completely characterize the Hot Swap circuit

performance. These actions are:

- A power-up without any additional load

- A current limit operation after successful power-up

transient

- A power-up with shorted output

1. Initially, install the jumper heads in the following posi-

tions, if the first ideal diode is used in the test:

JP1 EN_SEL in the position LOW

JP2 D2ON_SEL in the position OFF

JP3 ON_SEL in the position OFF

If the second ideal diode is used:

JP1 EN_SEL in the position LOW

JP2 D2ON_SEL in the position ON

JP3 ON_SEL in the position OFF

Connect a 12V power supply to the board input turrets

IN1 (or IN2) and GND. Do not load the output. Place

the current probe on the 12V wire and voltage probes

on the OUT turret.

Provide ON signal at the ON pin by changing the JP3

jumper headerposition fromOFF positionto ON.Observe

the transient. The output voltage rise time should be

in the range of 12ms to 29ms. PWRGD green LED D3

(D5) must turn on. Turn off the rail using the ON jumper.

2. Connect a disabled electronic load to the OUT turret

and GND. Turn on the rail and slowly increase the load

current up to the circuit breaker threshold level. The

current limit range should be from 7.8A to 8.9A.

The DC1625A-A circuit features a latchoff circuit breaker,

and DC1625A-B provides automatic retry after a fault.

Turn off the rail with the ON_SEL jumper.

3. Initially short output with external wire. Place the current

probe at this external wire. Turn on the rail and record

the current shape. The maximum current should be in

the 10.1A to 11.8A range.

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dc1625af

DEMO MANUAL DC1625A

IDEAL DIODE FUNCTIONALITY TEST

In this test, both ideal diodes are active and small varia-

tions in the input voltage forces one ideal diode to be off

and another ideal diode to be on.

Connect input turrets (IN1 and IN2) of each ideal diode

with individual independent lab supply. Adjust each input

voltage to 12V with maximum possible accuracy. Place

qUick stArt proceDUre

one voltmeter between IN1 and IN2 turrets to measure

the difference between two input voltages. Connect an

electronic load to the output turret. Activate both rail and

keep a load around 1A to 3A. Play with input voltage levels

and be sure that when the difference between input volt-

ages exceeds 40mV, only one rail feeds the load.

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dc1625af

DEMO MANUAL DC1625A

qUick stArt proceDUre

Figure 1. Measurement Equipment Setup for the LTC4227 Test

SWITCH

DC1625A F01

POWER

SUPPLY 1

POWER

SUPPLY 2

LOAD

–

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dc1625af

DEMO MANUAL DC1625A

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 8 C1, C2 ,C3, C4, C6,

C7, C10, C11

CAP, X7R, 0.1µF, 50V, 0603 TDK, C1608X7R1H104K

2 1 C5 CAP, X7R, 15nF, 50V, 0603 AVX, 06035C153KAT

3 0 C8, C9 OPT CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS

4 1 C12 CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS

5 0 C12 OPT CAP, AL, El, S/M 1000µF, 50V NIC, NACEW102M50V16X17TR13F

6 2 D1, D2 DIODE, VOLTAGE SUPPRESSOR, SMA DIODES, SMAJ17A-13-F

7 1 D3 LED, SMT GREEN PANASONIC, LN1351CTR

8 1 D4 LED, SMT RED PANASONIC, LN1261CTR

911 E1, E3, E6, E8, E9,

E12 to E17

TURRET, TESTPOINT, 2501 MILL-MAX, 2501-2-00-80-00-00-07-0

10 7 E2, E4, E5, E7, E10,

E11, E18

JACK BANANA KEYSTONE, 575-4

11 2E27, E28 TURRET, TESTPOINT, 2308 MILL-MAX, 2308-2-00-80-00-00-07-0

12 3JP1, JP2, JP3 HEADERS, 3 PINS 2mm CTRS SAMTEC TMM-103-02-L-S

13 3XJP1, XJP2, XJP3 SHUNT, 2mm CTRS SAMTEC 2SN-BK-G

14 2Q1, Q2 MOSFET, N-CHANNEL, 30-V VISHAY, SiR462DP-T1-GE3

15 1 Q3 MOSFET, N-CHANNEL, 30-V VISHAY, Si7336ADP-T1-GE3

16 1 RS1 RES, CHIP, 0.006, 1/2W, 1%, 2010 KOA, TLR2HDBK6L00F75

17 3 R1, R9, R10 RES, CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA

18 1 R2 RES, CHIP, 47, 1%, 0603 VISHAY, CRCW060347R0FKEA

19 2 R3, R7 RES, CHIP, 20k, 1%, 0603 VISHAY, CRCW060320K0FKEA

20 1R4 RES, CHIP, 22.1k, 1%, 0603 VISHAY, CRCW060322K1FKEA

21 2 R5, R6 RES, CHIP, 3k, 1%, 0805 VISHAY, CRCW08053K00FKEA

22 1R8 RES, CHIP, 28.7k, 1%, 0603 VISHAY, CRCW060328K7FKEA

23 4STAND-OFF STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON)

24 1STENCIL STENCIL 1625A

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dc1625af

DEMO MANUAL DC1625A

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.

scheMAtic DiAgrAM

D D

C C

B B

A A

OFF

LTC4227CUFD-2

OFF

50V

DC1625A-B

DC1625A-A

100uF

ASSY

(

ASSY TABLE

(

LTC4227CUFD-1

Wednesday, May 12, 2010

DUAL IDEAL DIODE AND SINGLE HOT SWAP CONTROLLER

VLAD O.

N/A

LTC4227CUFD-1/2

DEMO CIRCUIT 1625A

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

VLAD O.

PRODUCTION-2 05-12-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ON_PIN

IN1

OUT

IN2

IN1

TP21

E16

GND

E19

TP25

E12

SMAJ17A

E17

PROBE GND

SMAJ17A

IN1

2.9V to 18V

0.1uF

50V

X7R

E14

IN1

E28

FAULT

IN2

SiR462DP

2 6

15nF 50V

TP23

GND

E13

GND

100uF

50V

OPT

C10

0.1uF

50V

OUT

E18

SENSEP

28.7K

JP1

LOW

EXT

EN_SEL

JP3

HS_ON

0.1uF

16V

X7R

INTVcc

D2ON

GND

TMR

PWRGD

FAULT

HGATE

SENSEM

SENSEP

DGATE2

CPO2

IN2

DGATE1

IN1

CPO1

OUT

E27

PWRGD

GND

RS1

0.006

0.5W

TP20

Si7336ADP

0.1uF

50V

0.1uF

50V

C12

1000uF

50V

OPT

OUT

7.6A

TP26

TP24

SiR462DP

2 6

JP2

D2ON_SEL

GREEN

TP22

RED

20K

R10

E11

GND

E7 GND

0.1uF

50V

X7R

E10

IN2

2.9V to 18V

0.1uF

50V

X7R

E15

D2ON

100uF

50V

OPT

20K

22.1K

C11

0.1uF

50V

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dc1625af

DEMO MANUAL DC1625A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0611 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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