Linear Technology DC1899A Manual de usuario

dc1899af

DEMO MANUAL DC1899A

DESCRIPTION

LTC4228-1/LTC4228-2

Dual Ideal Diode and

Hot Swap Controller

Demonstration circuit 1899A controls two independent

power rail circuits each with Hot Swap™ and ideal diode

functionality provided by the LTC4228-1/LTC4228-2 dual

ideal diode and Hot Swap controller.

DC1899A facilitates evaluation of LTC4228 performance

in different operation modes such as supply ramp-up,

power supply switchover, steady state, and overcurrent

faults. Power supply switchover mode can be realized as

either an ideal diode or as a prioritizer.

Each DC1899A circuit is assembled to operate with a

12V supply and 9A maximum current load. The main

components of the board are the LTC4228 controller, two

MOSFETs operating as ideal diodes, two MOSFETs operat-

ing as Hot Swap devices, two current sense resistors, two

jumpers for independently enabling each rail, six LEDs to

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

indicatestatus,powergoodandfaultconditionsseparately

for each channel, and input voltage snubbers. There are

pads for optional RC circuits for each Hot Swap MOSFET

gate in order to adjust output voltage slew rate. In addition

to this there are jumpers allowing monitoring of supply

undervoltage conditions at either IN or SENSE+ pins.

The standard configuration (as DC1899A populated by

default) places the ideal diode MOSFET ahead of the Hot

Swap MOSFET. The board also has pads for an alternative

configuration with the Hot Swap MOSFET located ahead

of the ideal diode MOSFET.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 2.9 18 V

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

VINTVCC(HYST) Internal VCC Undervoltage Lockout Hysteresis 30 60 90 mV

Ideal Diode Control

∆VFWD(REG) Forward Regulation Voltage (VIN – VOUT) 102540 mV

∆VDGATE External N-Channel Gate Drive

(VDGATE – VIN)

∆VFWD = 0.1V

IN < 7V

IN = 7V to 18V

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

CPO = IN = 18V

–60

–50

–95

–85

–120

–110

µA

IDGATE(FPU) DGATE Fast Pull-Up Current ∆VFWD = 0.2V, ∆VDGATE = 0V, CPO = 17V –1.5 A

IDGATE(FPD) DGATEn Fast Pull-Down Current ∆VFWD = –0.2V, ∆VDGATE = 5V 1.5 A

Hot Swap Control

∆VSENSE(CB) Circuit Breaker Trip Sense Voltage

(VSENSEEn+– VSENSEEn–)

47.5 50 52.5 mV

∆VSENSE(ACL) Active Current Limit Sense Voltage

(VSENSEEn+– VSENSEEn–)

55 65 75 mV

IHGATE(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

dc1899af

DEMO MANUAL DC1899A

OPERATING PRINCINPLES

The LTC4228 functions as an ideal diode with inrush

current limiting and overcurrent protection by controlling

two external back-to-back N-channel MOSFETs in a power

path. The LTC4228 has two ideal diode and two Hot Swap

controllers. Each ideal diode MOSFET is intended to oper-

ate with a defined Hot Swap MOSFET, because they are

tied by common on/off control, and ideal diode controller

sense voltage includes both MOSFETs and sense resistor

voltage drop. Therefore, LTC4228 provides independent

control for the two input supplies.

The LTC4228 gate drive amplifiers monitor the voltage

between the INn and OUTn pins and drive the DGATEn

pins. The amplifier quickly pulls up the DGATE pin, turning

on the MOSFET (Q1 or Q3), for ideal diode control when

it senses a large forward voltage drop. Pulling the ON pin

high and EN pins low initiates a 100ms debounce timing

cycle. After this timing cycle, a 10A current source from

the charge pump ramps up the HGATEn pin. When the Hot

Swap MOSFET (Q2 or Q4) turns on, the inrush current

is limited to a set level set by an external sense resistor

placed between IN and SENSE pins.

An active current limit amplifier servos the gate of the Hot

Swap MOSFET to 65mV across the current sense resistor.

Inrush current can be further reduced, if desired, by add-

ing a capacitor from HGATE to GND. When the MOSFET’s

gate overdrive (HGATE to OUT voltage) exceeds 4.2V, the

PWRGD pin pulls low. When both MOSFETs (Q1 and Q2 or

Q3 and Q4) are turned on, the gate drive amplifier controls

DGATE to servo the forward voltage drop (VIN – VOUT)

across the sense resistor and the back-to-back MOSFETs

to 25mV. If the load current causes more than 25mV of

voltagedrop,thegatevoltagerisestoenhancetheMOSFET

used for ideal diode control. For large output currents the

MOSFET’s gate is driven fully on and the voltage drop is

equal to the sum of the ILOAD • RDS(ON) of the two MOS-

FETs in series.

In the case of an input supply short-circuit when the

MOSFETs are conducting, a large reverse current starts

flowing from the load towards the input. The gate drive

amplifier detects this failure condition as soon as it ap-

pears and turns off the ideal diode MOSFET by pulling

down the DGATE pin.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Input/Output Pin

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

VON(RESET) ONn Pin Fault Reset Threshold Voltage ON Falling 0.55 0.6 0.63 V

VEN(TH) EN Pin Threshold Voltage EN Rising 1.185 1.235 1.284 V

VTMR(TH) TMRn Pin Threshold Voltage TMR Rising

TMR Falling

1.198

0.15

1.235

0.2

1.272

0.25

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

ITMR(DN) TMRn Pin Pull-Down Current TMR = 2V, No Faults 1.4 2 2.6 µA

ITMR(RATIO) TMRn Current Ratio ITMR(DN)/ITMR(UP) 1.4 2 2.7 %

dc1899af

DEMO MANUAL DC1899A

QUICK START PROCEDURE

Demonstration circuit 1899A can beeasilyset up toevaluate

the performance of the LTC4228-1/LTC4228-2. Refer to

the Figure 1 for proper measurement equipment setup and

follow the procedure below. The DC1899A test includes

independent tests of the LTC4228 Hot Swap functionality,

ideal diode functionality and two power rails prioritizer

functionality with the channel 1 highest priority.

HOT SWAP FUNCTIONALITY TEST

This test is identical for each 12V rail and is performed

in the three steps by the measuring of the transient’s

parameters in the different operation modes.

Install the jumpers in the following positions:

JP4, RON1_SEL and JP5, RON2_SEL in position OFF;

JP1, EN1_SEL and JP2, EN2_SEL in position LOW.

Figure 1. Measurement Equipment Setup for Hot Swap Functionality Test

SW2

CL1

SW1

RL1

PSU

SW4

CL2

SW3

RL2

PSU

dc1899af

DEMO MANUAL DC1899A

dn1899a F03

OUTPUT VOLTAGE

DROPPING DUE

TO SHUTDOWN

CURRENT LIMIT AT 10A

CURRENT 2A/DIV

No-Load Rampup

Connect a 12V power supply to the board input turrets

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

probe on the 12V supply and voltage probes on the OUT1

(OUT2) turret. Provide ON1 (ON2) signal at the ON1 (ON2)

pin by moving the RON1_SEL (RON2_SEL) jumper from

OFFpositiontothe12Vposition.Observe the transient. The

output voltage rise time should be in the range of 12ms

to 29ms. PWRGD1 (PWRGD2) green LED should be lit.

Turn off the rail using the RON1_SEL (RON2_SEL) jumper.

Current Limit

Initially adjust an electronic resistive load to 10 to 12

and connect it to the OUT1 (OUT2) turret and GND. Turn

on the rail and slowly increase load current up to the

circuit breaker threshold level. The current limit range

should be between 9A and 12.3A. Turn off the rail using

the RON1_SEL (RON2_SEL) jumper.

Figure 2. Turn-On Output Transient Test

Figure 3. Current Limiting Test

QUICK START PROCEDURE

dn1899a F02

INPUT CURRENT

VOUT

dc1899af

DEMO MANUAL DC1899A

Figure 4. Short-Circuit Test (2A/Div)

Power-Up into Output Short

Short the output to ground with a wire. Place the current

probe on this wire. Turn on the rail and record the current

shape. The maximum current should be in the 11.6A to

16.9A range. The LTC4228-1 latches off after overcurrent

condition, but the LTC4228-2 automatically retries after

200ms to 450ms.

IDEAL DIODE FUNCTIONALITY TEST

Use an individual 12V power supply for each rail; connect

the two outputs together at a common load. Adjust each

input voltage to 12V with maximum possible accuracy.

In this test, both rails are active and small variations in

the input voltage will force one channel off and the other

channel on. Place a voltmeter between IN1 and IN2 turrets

to measure the difference between two input voltages.

Activate both rails and keep a load around 1A to 3A. Ad-

just the input voltage level of one supply such that IN1 is

QUICK START PROCEDURE

40mV more positive than IN2. Verify that only channel 1

is drawing current. Repeat this test with IN1 at –40mV

with respect to IN2. In this case channel only channel 2

is drawing current.

PRIORITIZER FUNCTIONALITY TEST

The DC1899A is assembledwith components to implement

a power prioritizer with channel1 having the higher priority.

Place JP7 PPR_SEL (power priority select) jumper in

position ON2 and JP5 RON2_SEL (ON2 select) in posi-

tion OFF.

Apply independent supply voltages (12V) to both inputs.

Channel 1 will be connected to load. Reduce channel 1

input voltage until it reaches an undervoltage condition

and D6 (PWRGD2) lights. At the same time channel 2

power supply will deliver power to the load.

dn1899a F04

CURRENT PROFILE DURING

SHORT-CIRCUIT TURN-ON

dc1899af

DEMO MANUAL DC1899A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 7 C1, C2, C3, C8, C9, C11, C14 CAP., X7R, 0.1µF, 50V, 0603 AVX, 06035C104KAT

2 2 C4, C5 CAP., X7R, 47nF, 50V, 0603 AVX, 06035C473KAT

3 2 C6, C7 CAP., X7R, 15nF, 50V, 0603 AVX, 06035C153KAT

4 0 C10, C12, C13, C15 CAP., ALUMINUM, 100µF 50V, OPT SANYO, 50CE100BS

5 2 D1, D2 DIODE, VOLTAGE SUPP. 19V 5%, SMA-DIODE VISHAY, SMAJ17A-E3

6 4 D3, D5, D6, D8 LED, SMT GREEN, J TYPE, LED-LN1351C-GREEN PANASONIC, LN1351C-TR

7 2 D4, D7 LED, SMT RED, GW TYPE, LED-LN1261C-RED PANASONIC, LN1261C-TR

8 1 D9 DIODE, SWITCHING, SOD80 VISHAY, LS4148-GS18

9 0 D10, D11, D12, D13 DIODE, CMHZ4706, SOD123 OPT

10 8 E1, E2, E3, E4, E5, E6, E7, E8 TP, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

11 12 E9, E10, E11, E13-E16, E18-E22 TP, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

12 5 JP1, JP2, JP3, JP6, JP7 JMP, HD1X3, 0.079CC SAMTEC, TMM-103-02-L-S

13 2 JP4, JP5 JMP, HD2X4, 0.079CC SAMTEC, TMM-104-02-L-D

14 8 J1, J2, J3, J4, J5, J6, J7, J8 JACK, BANANA KEYSTONE, 575-4

15 4 Q1, Q2, Q3, Q4 MOSFET, N-CH, 30-V, SO8-POWERPAK VISHAY, SiR158DP

16 0 Q5, Q6, Q7, Q8 MOSFET, N-CH, 30-V, SiR158DP, SO8-POWERPAK OPT

17 2 RS1, RS2 RES., CHIP, 0.005, 1/2W, 1%, 2010 VISHAY, WSL20105L000FEA

18 0 RS3, RS4 RES., CHIP, 0.005, 1/2W, 1%, 2010, OPT VISHAY, WSL20105L000FEA

19 4 R1, R3, R19, R20 RES., CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA

20 2 R2, R4 RES., CHIP, 47, 1%, 0603 VISHAY, CRCW060347R0FKEA

21 6 R5, R6, R7, R8, R9, R10 RES., CHIP, 3k, 1%, 0805 VISHAY, CRCW08053K00FKEA

22 2 R11, R15 RES., CHIP, 20k, 1%, 0603 VISHAY, CRCW0060320K0FKEA

23 2 R12, R16 RES., CHIP, 137k, 1%, 0603 VISHAY, CRCW0603137KFKEA

24 2 R13, R17 RES., CHIP, 49.9k, 1%, 0603 VISHAY, CRCW060349K9FKEA

25 2 R14, R18 RES., CHIP, 28k, 1%, 0603 VISHAY, CRCW0060328K0FKEA

26 0 R21, R25 RES., CHIP, 10, 0603 OPT

27 0 R22, R26 RES., CHIP, 0, 0603 OPT

28 1 R23 RES., CHIP, 470, 1%, 0603 VISHAY, CRCW0603470RFKEA

29 1 R24 RES., CHIP, 41.2k, 1%, 0603 VISHAY, CRCW0060341K2FKEA

DC1899A-A Assembly

2 1 U1 I.C. LTC4228IUFD-1, QFN28UFD LINEAR TECH., LTC4228IUFD-1

DC1899A-A Assembly

2 1 U1 I.C. LTC4228IUFD-2, QFN28UFD LINEAR TECH., LTC4228IUFD-2

dc1899af

DEMO MANUAL DC1899A

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

LTC4228IUFD-1

ASSY

-A

-B

*LTC4228IUFD-2

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

12V

3.3V

12V

3.3V

OFF

THICK TRACE WIDTH > 500 MIL

ON2

IN1

DG1

OUT1

HG1

ON1

DG1

HG1

DG2

HG2

OUT2

IN2

DG2

HG2

SENSE1+

SENSE1-

SENSE2+

SENSE2-

IN1

SENSE1+

OUT1

INTVCC

SENSE2+

IN1SENSE1+

IN2

OUT2

SENSE1+

SENSE2+

IN2SENSE2+

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE1 10-25-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE1 10-25-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

VLADIMIR O.1ST PROTOTYPE1 10-25-11

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

10/25/2011, 04:28 PM

DUAL IDEAL DIODE AND HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

LTC4228IUFD-1/-2

DEMO CIRCUIT 1899A

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

10/25/2011, 04:28 PM

DUAL IDEAL DIODE AND HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

LTC4228IUFD-1/-2

DEMO CIRCUIT 1899A

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

10/25/2011, 04:28 PM

DUAL IDEAL DIODE AND HOT SWAP CONTROLLER

KIM T.

VLADIMIR O.

LTC4228IUFD-1/-2

DEMO CIRCUIT 1899A

E14 EN1

ADJ., 9A

OUT2

ADJ., 9A

OUT2

15nF

50V

15nF

50V

RS3

0.0050.5W

2010 OPT

RS3

0.0050.5W

2010 OPT

JP7

PPR_SEL

ON2

OFF

HD1X3-079

JP7

PPR_SEL

ON2

OFF

HD1X3-079

C13

100uF

50V

OPT

C13

100uF

50V

OPT

R10

0805

R10

0805

E21 PWRGD2

E13 EN2

E4 GND

R16

137k

R16

137k

E11

GND E11

GND

GREEN

LN1351C

GREEN

LN1351C

E1 OUT1

R20

E16 PWRGD1

R18

28k

R18

28k

JP1

EXT

LOW

EN1_SEL

JP1

EXT

LOW

EN1_SEL

IN1

2.9V - 18V

IN1

2.9V - 18V

DG2DG2

0.1uF

50V

0.1uF

50V

0.1uF

50V

0.1uF

50V R7

0805

SiR158DP

OPT

SiR158DP

OPT

IN1 E5

IN1

C15

100uF

50V

OPT

C15

100uF

50V

OPT

GREEN

LN1351C

GREEN

LN1351C

1 2

D11

CMHZ4706

OPT

D11

CMHZ4706

OPT

GND E8

GND

E20 STATUS2

R25

OPT

R25

OPT

GREEN

LN1351C

GREEN

LN1351C

1 2

SiR158DP

HG2HG2

0.1uF

50V

0.1uF

50V

R13

49.9k

R13

49.9k

IN2

2.9V - 18V

IN2

2.9V - 18V

SiR158DP

OPT

SiR158DP

OPT

J1 ADJ., 9A

OUT1

J1 ADJ., 9A

OUT1

RED

LN1261C

RED

LN1261C

U1 *

QFN28UFD-4X5

U1 *

QFN28UFD-4X5

IN1 3

TMR2 18

HGATE1 25

GND

DGATE2

9IN2

SENSE2+

CPO2

SENSE2-

STATUS2 11

FAULT2 15

HGATE2

OUT2

PWRGD2 14

TMR1 19

EN1 20

ON2

ON1

OUT1 24

FAULT1 22

SENSE1- 1

SENSE1+ 2

PWRGD1 23

EN2 17

STATUS1 26

INTVCC

CPO1 27

DGATE1 28

R23

470

R23

470

JP5

HD2X4-079

RON2_SEL

JP5

HD2X4-079

RON2_SEL

5 6

7 8

J4 GND

E22 FAULT2

R17

49.9k

R17

49.9k

E18

ON1 E18

ON1

SMAJ17A

RS4

0.0050.5W

2010 OPTRS4

0.0050.5W

2010 OPT

E10

ON2 E10

ON2

LS4148

0805

D10

CMHZ4706

OPT

D10

CMHZ4706

OPT

E2 GND

E15 FAULT1

SiR158DP

RED

LN1261C

RED

LN1261C

1 2

R11

20K

R11

20K

D13

CMHZ4706

OPT

D13

CMHZ4706

OPT

1 2

C14

0.1uF

50V

C14

0.1uF

50V

RS2

0.005

0.5W

2010

RS2

0.005

0.5W

2010

R22

OPT

R22

OPT

GND J6

GND

0.1uF

50V

0.1uF

50V

D12

CMHZ4706

OPT

D12

CMHZ4706

OPT

1 2

0805

C10

100uF

50V

OPT

C10

100uF

50V

OPT

C12

100uF

50V

OPT

C12

100uF

50V

OPT

47nF 16V

R21

OPT

R21

OPT

GREEN

LN1351C

GREEN

LN1351C

GND J8

GND

SiR158DP

JP3

VS1+

VIN1

VON1_SEL

JP3

VS1+

VIN1

VON1_SEL

GND E6

GND

R26

OPT

R26

OPT

0805

JP2

EXT

LOW

EN2_SEL

JP2

EXT

LOW

EN2_SEL

E3 OUT2

R14

28k

R14

28k

SiR158DP

OPT

SiR158DP

OPT

SiR158DP

E19 STATUS1

JP6

VS2+

VIN2

VON2_SEL

JP6

VS2+

VIN2

VON2_SEL

0.1uF

50V

0.1uF

50V

JP4

HD2X4-079

RON1_SEL

JP4

HD2X4-079

RON1_SEL

5 6

7 8

R24

41.2k

R24

41.2k

RS1

0.005

0.5W

2010

RS1

0.005

0.5W

2010

DG1DG1

R12

137k

R12

137k

C11

0.1uF

50V

C11

0.1uF

50V

SMAJ17A

47nF 16V

0805

R19

10 J2 GND

J2 GND

HG1HG1

15nF

50V

15nF

50V

PROBE GND E9

PROBE GND

R15

20K

R15

20K

SiR158DP

OPT

SiR158DP

OPT

IN2 E7

IN2

dc1899af

DEMO MANUAL DC1899A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0812 • 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

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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