Linear Technology Analog Devices DC2814A-A Guida rapida alla configurazione

DEMO MANUAL DC2814A-A

Rev. 0

DESCRIPTION

LT8210

High Voltage, High Efficiency Synchronous Buck-Boost

Converter with Input to Output Pass-Thru

Demonstration circuit 2814A-A is a high voltage, high

efficiency synchronous buck-boost DC/DC converter with

an input voltage range of 8V to 80V. After the part has

started, the input voltage can run down to 3.5V. It can

supply a 3A maximum load current with an output range

of 8V to 16V. The demo board features the LT8210EUJ

controller. The constant frequency current mode architec-

ture allows a phase-lockable frequency of up to 400kHz,

while an optional input or output current feedback loop

provides support for applications such as battery charg-

ing. With a wide input range, wide output range, and

seamless transfers between operation modes, the LT8210

is ideal for industrial, automotive, medical, military, and

avionics applications.

The converter has four modes of operation:burst, pulse

skip, forced continuous mode, or pass-thru. Pass-thru is

a feature that passes the input directly to the output when

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

the input voltage is within a user programmable window.

Switching losses drop to zero and efficiency is maximized.

For input voltage above or below the pass-thru window,

the buck or boost regulation loops maintain the output

at the set maximum or minimum values, respectively.

Reverse input protection is also implemented on this

demo board.

The available versions of the DC2814A are:

DC2814A-A: 8V to 40VIN, 80VIN Surge (60s), Operates

Down to 3.5VIN after Start-Up, VOUT = 8V to 16V at 3A

DC2814A-B: 9V to 36VIN, 80VIN Surge (60s),

VOUT = 24V to 36V at 2.5A

DC2814A-C: 26V to 80VIN, VOUT = 36V to 56V at 2A

Design files for this circuit board are available.

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range, VIN 8V to 40V Continuous, 80V Surge (60 Seconds)

(Operates Down to 3.5V after Start-Up)

Output Voltage, VOUT VIN = 3.5V (8V Start-Up) to 80V, IOUT = 0A to 3A 8V to 16V

Maximum Output Current, IOUT VIN = 3.5V (8V Start-Up) to 80V, VOUT = 8V to 16V 3A

Default Operating Frequency 385kHz (RT= 16.9k)

Typical Efficiency 6VIN, 8VOUT (Boost), 3A

8VIN, 8VOUT (Buck-Boost), 3A

12VIN, 12VOUT (Pass-Thru), 3A

17VIN, 16VOUT (Buck-Boost), 3A

30VIN, 16VOUT (Buck), 3A

94%

98%

95%

94%

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DEMO MANUAL DC2814A-A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2814A-A is easy to set up to

evaluate the performance of the LT8210. Refer to the

followingprocedure:

1. With power off, connect the input power supply to VIN

(8V to 40V) and GND (input return).

2. Connect the 8V to 16V output load between VOUT and

GND.

3. Connect the DVMs to the input and the output.

4. Turn on the input power supply and then check for the

proper output voltages. VOUT should be between 8V to

16V, depending on the input voltage (see Figure4).

5. Once the proper output voltages are established, adjust

the loads within the operating range and observe

the output voltage regulation, ripple voltage and

otherparameters.

6. After the part starts, the input voltage can be reduced

to as low as 3.5V.

7. The input voltage may be raised up to 80V for short

periods of time.

Note:When measuring the output or input voltage rip-

ple, do not use the long ground lead on the oscilloscope

probe. See Figure1 for the proper scope probe technique.

Short, stiff leads need to be soldered to the (+) and (–)

terminals of an output capacitor. The probe’s ground ring

needs to touch the (–) lead and the probe tip needs to

touch the (+) lead.

Figure2. Output Voltage vs Input Voltage

+ –

VOUT GND DC2814aa F01

COUT

OUT

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

DC2814aa F02

Figure1. Measuring Output Voltage Ripple

Figure3. Efficiency vs VIN Figure4. Efficiency vs IOUT

BOOST

BOOST-BUCK

PASS-THRU

BUCK-BOOST

BUCK

OUT

= 0.5A

OUT

= 1.0A

OUT

= 3.0A

INPUT VOLTAGE (V)

EFFICIENCY VS V

100

EFFICIENCY (%)

DC2814aa F03

OUTPUT CURRENT (A)

EFFICIENCY VS I

OUT

0.01

0.1

100

EFFICIENCY (%)

DC2814aa F04

(BOOST)

(BOOST-BUCK)

12V

(PASS-THRU)

16V

(BUCK-BOOST)

40V

(BUCK)

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 5. ISO16750 4.6.4, Test A without Centralized

Load Dump Suppression (IOUT = 3A)

Figure 7. ISO16750 4.6.3, Starting Profile (IOUT = 1.5A)

Figure 6. LV124 E-04, Jumpstart (IOUT = 3A)

Figure 8. VIN Range (IOUT = 3A)

SW1

50V/DIV

SW2

50V/DIV

20ms/DIV

VOUT

5V/DIV

VIN

20V/DIV

DC2814aa F05

SW1

50V/DIV

SW2

50V/DIV

200ms/DIV

VOUT

20V/DIV

VIN

20V/DIV

DC2814aa F06

SW1

10V/DIV

SW2

10V/DIV

1s/DIV

VOUT

2V/DIV

VIN

5V/DIV

DC2814aa F07

SW1

50V/DIV

SW2

50V/DIV

40ms/DIV

VOUT

5V/DIV

VIN

20V/DIV

DC2814aa F08

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 9. DC2814A-A Thermal Performance at 6VIN (Boost), 8VOUT, 3A Load Current

Figure 11. DC2814A-A Output Voltage Ripple at 6VIN (Boost),

8VOUT, 3A Load Current

Figure 10. DC2814A-A Load Transients at 6VIN (Boost),

8VOUT, 0.3A to 2.7A Load Current

SW1

5V/DIV

SW2

5V/DIV

2ms/DIV

VOUT

50mV/DIV

DC2814aa F10

2µs/DIV

VOUT

50mV/DIV

DC2814aa F11

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 13. DC2814A-A Load Transients at 7.5VIN (Buck-Boost),

8VOUT, 0.3A to 2.7A Load Current

Figure 14. DC2814A-A Output Voltage Ripple at 8VIN

(Buck-Boost), 8VOUT, 3A Load Current

Figure 12. DC2814A-A Thermal Performance at 8VIN (Buck-Boost), 8VOUT, 3A Load Current

SW1

5V/DIV

SW2

5V/DIV

2ms/DIV

VOUT

50mV/DIV

DC2814aa F13

2µs/DIV

VOUT

50mV/DIV

DC2814aa F14

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 17. DC2814A-A Output Voltage Ripple at 12VIN

(Pass-Thru), 12VOUT, 3A Load Current

Figure 15. DC2814A-A Thermal Performance at 12VIN (Pass-Thru), 12VOUT, 3A Load Current

Figure 16. DC2814A-A Load Transients at 12VIN (Pass-Thru),

12VOUT, 0.3A to 2.7A Load Current

SW1

5V/DIV

SW2

5V/DIV

2ms/DIV

VOUT

200mV/DIV

DC2814aa F16

2µs/DIV

VOUT

50mV/DIV

DC2814aa F17

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 19. DC2814A-A Load Transients at 17VIN

(Buck-Boost), 16VOUT, 0.3A to 2.7A Load Current

Figure 18. DC2814A-A Thermal Performance at 17VIN (Buck-Boost), 16VOUT, 3A Load Current

Figure 20. DC2814A-A Output Voltage Ripple at 17VIN

(Buck-Boost), 16VOUT, 3A Load Current

SW1

10V/DIV

SW2

10V/DIV

2ms/DIV

VOUT

100mV/DIV

DC2814aa F19

2µs/DIV

VOUT

50mV/DIV

DC2814aa F20

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DEMO MANUAL DC2814A-A

Rev. 0

TEST RESULTS

Figure 21. DC2814A-A Thermal Performance at 30VIN (Buck), 16VOUT, 3A Load Current

Figure 23. DC2814A-A Output Voltage Ripple at 30VIN

(Buck), 16VOUT, 3A Load Current

Figure 22. DC2814A-A Load Transients at 30VIN (Buck),

16VOUT, 0.3A to 2.7A Load Current

SW1

10V/DIV

SW2

10V/DIV

2ms/DIV

VOUT

100mV/DIV

DC2814aa F22

2µs/DIV

VOUT

50mV/DIV

DC2814aa F23

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DEMO MANUAL DC2814A-A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, CFOUT1 CAP, 1µF ,X7S, 100V, 10%, 0805, SOFT TERM MURATA GRJ21BC72A105KE11L

TDK C2012X7S2A105K125AE

2 5 C7, C8, C11, C12, C23 CAP, 0.1µF, X7S, 100V, 10%, 0603 TAIYO YUDEN HMK107C7104KA-T

TDK C1608X7S2A104K080AB

3 6 C9, C10, C21, C22,

C31, C32

CAP, 4.7µF, X7S, 100V, 20%, 1210 TDK C3225X7S2A475M200AB

4 2 C13, C14 CAP, 10µF, X7R, 25V, 20%, 1210 KEMET C1210C106M3RAC7800

TDK C3225X7R1E106M250AC

5 3 C15, C16, C24 CAP, 0.1µF, X7R, 50V, 10%, 0603, AEC-Q200 TDK CGA3E2X7R1H104K080AA

6 1 C18 CAP, 22µF, ALUM ELECT, 100V, 20%, 8x10.2mm SMD,

AEC-Q200

PANASONIC EEETG2A220UP

7 2 C19, C20 CAP, 330µF, ALUM ELECT, 35V, 20%, SMD 10mm ×

10.2mm

SUN ELECTRONIC INDUSTRIES CORP 35CE330AX

8 1 C37 CAP, 1µF, X7S, 100V, 10%, 0805, SOFT TERM AVX 08053C105KAT2A

MURATA GRJ21BC72A105KE11

9 1 CC1 CAP

, 2200pF, X7R, 25V, 10%, 0402 AVX 04023C222KAT2A

10 1 CC2 CAP, 2200pF, X7R, 16V, 10%, 0402 AVX 0402YC222KAT2A

KEMET C0402C222K4RACTU

MURATA GRM155R71C222KA01D

11 1 CGATE1 CAP, 4.7µF, X5R, 10V, 10%, 0402 TDK C1005X5R1A475K050BC

12 1 CIMON1 CAP, 3300pF, X7R, 16V, 10%, 0402 AVX 0402YC332KAT2A

MURATA GRM15XR71C332KA86D

13 2 CP1, CP2 CAP, 220pF, NP0, 25V, 10%, 0402 AVX 04023A221KAT2A

14 1 CSN1 CAP, 1000pF, X7R, 16V, 10%, 0402 AVX 0402YC102KAT2A

MURATA GRM155R71C102KA01D

15 1 CSS1 CAP, 0.1µF, X7R, 25V, 10%, 0402 AVX 04023C104KAT2A

TAIYO YUDEN TMK105B7104KV-FR

16 1 CVDD1 CAP, 4.7µF, X5R, 10V, 10%, 0603 TDK CGB3B1X5R1A475K055AC

17 1 CXVCC1 CAP, 4.7µF, X5R, 16V, 20%, 0603 TDK C1608X5R1C475M080AC

18 2 DBST1, DBST2 DIODE, RECT, 400V, 1A, SOD123F, AEC-Q101 DIODES INC US1GWF-7

19 4 E1, E2, E9, E10 TEST POINT, TURRET, 0.094", MTG HOLE MILL-MAX 2501-2-00-80-00-00-07-0

20 7 E3, E4, E6, E7, E8,

E11, E12

TEST POINT, TURRET, 0.064", MTG HOLE MILL-MAX 2308-2-00-80-00-00-07-0

21 2 FB1, FB2 IND, 600Ω AT 100MHz, FERRITE BEAD, 25%, 2.5A,

70mΩ, 1206

WURTH ELEKTRONIK 742792118

22 4 J1, J2, J3, J4 CONN, BANANA JACK, FEMALE, THT,

NON-INSULATED, SWAGE

KEYSTONE 575-4

23 1 JP1 CONN, HDR, MALE, 2x3, 2mm, VERT, STR, THT SAMTEC TMM-103-02-L-D

24 2 JP2, JP3 CONN, HDR, MALE, 2x2, 2mm, VERT, STR, THT, 10µ"

SAMTEC TMM-102-02-L-D

25 1 L1 IND, 4.2µH, PWR, 20%, 11A, 7.1mΩ, 1050 WURTH ELEKTRONIK 744325420

26 1 L2 IND, 1.5µH, PWR, 20%, 13A, 4.3mΩ, 7050 WURTH ELEKTRONIK 744314150

27 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY THT-96-717-10

28 3 MA1, MB1, MDG1 XSTR, MOSFET, N-CH, 100V, 40V, PG-TSDSON-8 INFINEON BSZ150N10LS3 G

INFINEON BSZ150N10LS3GATMA1

29 2 MC1, MD1 XSTR, MOSFET, N-CH, 25V, 16A, PG-TSDSON-8 INFINEON BSZ036NE2LS

INFINEON BSZ036NE2LSATMA1

DEMO MANUAL DC2814A-A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

30 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE 8833

31 1 PCB1 PCB, DC2814A PHASE 3 600-DC2814A

32 1 R1A1 RES, 69.8kΩ, 1%, 1/16W, 0402 VISHAY CRCW040269K8FKED

33 2 R1B1, R2B1 RES, 10kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY CRCW040210K0FKED

NIC NRC04F1002TRF

34 8 R1C1, R2C1, R12,

R13, R33, R34, RBG1,

RBG2

RES, 0Ω, 1/16W, 0402 ROHM MCR01MZPJ000

VISHAY CRCW04020000Z0ED

NIC NRC04ZOTRF

YAGEO RC0402JR-070RL

35 1 R2A1 RES, 150kΩ, 1%, 1/16W, 0402 VISHAY CRCW0402150KFKED

36 2 R23, R24 RES, 10Ω, 1%, 1/16W, 0402, AEC-Q200 NIC NRC04F10R0TRF

VISHAY CRCW040210R0FKED

37 4 R35, RBST1,

RBST2, ROUT1

RES, 1Ω, 1%, 1/16W, 0402 VISHAY CRCW04021R00FKED

38 1 RC1 RES, AEC-Q200, 38.3kΩ, 1%, 1/16W, 0402 VISHAY CRCW040238K3FKED

39 1 RC2 RES, 60.4kΩ, 1%, 1/16W, 0402 NIC NRC04F6042TRF

VISHAY CRCW040260K4FKED

40 1 REN1 RES, 287kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY CRCW0402287KFKED

41 1 REN2 RES, 165kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY CRCW0402165KFKED

42 1 RIMON1 RES, 27.4kΩ, 1%, 1/16W, 0402, AEC-Q200 VISHAY CRCW040227K4FKED

43 1 RIN1 RES, 0Ω, 1/8W, 0805 VISHAY CRCW08050000Z0EA

YAGEO RC0805JR-070RL

44 1 RPWGD1 RES, 100kΩ, 1%, 1/16W, 0402, AEC-Q200 NIC NRC04F1003TRF

VISHAY CRCW0402100KFKED

45 1 RSNS1 RES, 0.004Ω, 1%, 1W, 1206, 4-TERM, SENSE,

AEC-Q200

SUSUMU KRL3216T4-M-R004-F-T1

46 1 RSNS2 RES, 0.01Ω, 1%, 1W ,1206 , 4-TERM, SENSE,

AEC-Q200

SUSUMU KRL3216T4-M-R010-F-T5

47 1 RT1 RES, 16.9kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC NRC06F1692TRF

PANASONIC ERJ3EKF1692V

VISHAY CRCW060316K9FKEA

48 1 STNCL1 TOOL, STENCIL, 700-DC2814A ANALOG DEVICES 830-DC2814A

49 1 U1 IC, 100V, BUCK-BOOST CONTROLLER, QFN-40 (6x6) ANALOG DEVICES LT8210EUJ#PBF

ANALOG DEVICES LT8210EUJ#TRPBF

50 3 XJP1, XJP2, XJP3 CONN, SHUNT, FEMALE, 2-POS, 2mm SAMTEC 2SN-BK-G

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