EPC 的 EPC9156 Quick Start Guide 规格书

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EFFICIENT POWER CONVERSION l

Development Board

EPC9156

Quick Start Guide

Revision 1.0

EPC21603

40 V, 10 A High Current Pulsed Laser Diode Driver

QUICK START GUIDE Demonstration System EPC9156

DESCRIPTION

The EPC9156 development board is primarily intended to drive laser

diodes with short, high current pulses. Capabilities include minimum

pulse widths of < 2 ns, peak currents > 10 A, and bus voltage rating of

30 V. The board is shipped with an EPC21603 eGaN® IC. The EPC21603

monolithically integrates an ultrafast eGaN gate driver with and a 10 A, 40 V

eGaN FET in one tiny 6-bump BGA IC. The EPC9156 ships with the EPC9989

interposer board. The EPC9989 is a collection of break-away 5 mm x 5 mm

square interposer PCBs with footprints for different lasers, RF connectors,

and a collection of other footprints designed for experimentation with

different loads. The use of the interposers allows many different lasers or

other loads to be mounted on the EPC9156. Laser diodes or other loads

are not included, and must be supplied by the user.

The EPC9156 combines EPC21603 eGaN IC with a printed circuit board

with inputs, outputs, and test points in order to evaluate and demonstrate

the capabilities of the IC and connected load. The printed circuit board

is designed to minimize the power loop inductance while maintaining

mounting flexibility for the laser diode or other load. It includes multiple

on-board passive probes for voltages and is equipped with MMCX

connections for input and sensing. The EPC21603 IC requires a 5 V VDD

supply, but is designed to interface with high-speed LVDS signals. Finally,

the board can also be used for other applications requiring a ground-

referenced eGaN FET, e.g. Class E amplifiers, boost converters, or similar. A

complete block diagram of the circuit is given in Figure 1, and a detailed

schematic in Figure 6.

For more information on the EPC21603 eGaN IC, please refer to the

datasheet available from EPC at www.epc-co.com. The datasheet should

be read in conjunction with this quick start guide.

SETUP AND OPERATION

Development board EPC9156 is easy to set up to evaluate the performance

of the EPC21603 eGaN IC. Refer to Figure 2 for proper connect and

measurement setup and follow the procedure below:

1. Review laser safety considerations. Observe all necessary laser safety

requirements including the use of personal protection equipment

(PPE) as required. Refer to qualified safety personnel as necessary.

2. With power off, install laser diode U2 or other load. The use of one of

the interposers from the included EPC9989 may be used to mount the

laser or other load, and this is discussed in the section LASER DIODE

AND LOAD CONSIDERATIONS for further information.

3. With power off, connect the input power supply bus to +VBUS (J8) and

ground / return to –VBUS (J8) or GND.

4. With power off, connect the logic supply (5.1-1.2 VDC) to +VLogic (J9)

and ground return to –VLogic (J9) or GND.

5. With power off, connect the signal pulse generator to the inputs J3

and J4, which are the IN+ and IN- inputs to the eGaN IC U2. J3 and

J4 expect an LVDS input and have a differential termination of 100 Ω

at the input of the EPC21603 IC (U2). If you are unfamiliar with LVDS

signal levels, please refer to an appropriate reference, such as LVDS

Application and Data Handbook published by Texas Instruments.

6. Connect the remaining measurement MMCX outputs to an oscil-

loscope, using 50 Ω cables and with the scope inputs set to 50 Ω

impedance. See section MEASUREMENT CONSIDERATIONS for more

information, including the attenuation values for each output.

Note

that the current sensing output is not functional for this board revision.

7. Turn on the logic supply voltage to a value within the specification.

8. Turn on the bus voltage to a value within the specification.

Table 1: Performance Summary (TA = 25°C) EPC9156

Symbol Parameter Conditions Min Nom Max Units

VLogic

Gate drive and logic supply

5.5 12

VBUS

Bus input voltage range

30*

ILOAD

Output load current

10**

ZIN

Input impedance

J3 input 50 Ω

VINPUT

Input pulse range

LVDS input

required for

proper

operation

FINPUT

Input pulse frequency

50 150*** MHz

TPin

Input pulse width

500 ns

9. Turn on the pulse source and observe switching operation via the

outputs and any additional desired probing. Laser diode output

may be observed with an appropriate electro-optical receiver.

10. Once operational, adjust the bus voltage, input pulse width, and

pulse repetition frequency (PRF) as desired within the operating

range and observe the system behavior.

11. For shutdown, please follow steps in reverse.

NOTE: This circuit contains nodes with very fast edges and with voltages one or two

orders of magnitude higher that standard logic signals. Standard methods

and probes for power circuits will normally not provide accurate results and

may disrupt circuit operation. Please consider probe choice and use carefully.

See EPC measurement applications note.

SAFETY WARNING: This board is capable of driving laser diodes to generate high

power optical pulses. Such pulses are capable of causing PERMANENT VISION

DAMAGE AND BLINDNESS as well as additional injury or property damage.

Laser diodes may emit infrared (IR) light that is invisible to the user, but which can

still cause PERMANENT VISION DAMAGE AND BLINDNESS as well as additional

injury or property damage. User is fully responsible for following proper laser

safety procedures to prevent injury or damage.

Figure 1: Block diagram of EPC9156 development board

VCAP (J2)

VOUT (J5)

VIN2 (J7)

VIN1 (J6)

Input (J3) +

Input (J4) –

5 V supply

Logic

(J9)

–

V5V0

BUS

(J8)

–

LDO

–

* The voltage rating of the EPC21603 eGaN IC is 40 V. The extremely fast switching

transitions may result in ringing. It is the responsibility of the user to ensure that

the peak voltage does not exceed the rating.

** This is the EPC21603 rating, and does not account for heat generated by the load.

It is the responsibility of the user to ensure that operating temperatures are within

component specifications.

*** The EPC21603 is specified to have a 100 MHz maximum operating frequency, but

in many cases can operate at a much higher frequency.

um ill i go o

QUICK START GUIDE Demonstration System EPC9156

OPERATING PRINCIPLE

The EPC9156 is intended as both a demonstration board and a flexible

development platform. It is functional out of the box, but is designed to

be modified to accommodate a broad range of applications. It is highly

recommended that the user read the entire guide in order to get

maximum value from the EPC9156.

The EPC9156 is shipped as a rectangular pulse laser diode driver. Please

refer to the block diagram (Fig. 2) and the schematic (Fig. 6). The EPC9156

basic operating principle is to act as a current gate to allow current from the

voltage bus to flow through the laser diode or other load when the IC U2

is commanded on, and stop the load current when the IC is commanded

off. The speed of the transitions are affected by the load, but are extremely

fast. For example, turn-on and turn-off can be faster than 500 ps and 250 ps,

respectively, for a load current of 10 A.

The IC U2 is controlled via an LVDS input pulse that is delivered to MMCX

connectors J3 (IN+) and J4 (IN-), which are differentially terminated on the

demo board with 100 Ω at the input pins of U2. If you are unfamiliar with

LVDS signal levels, please refer to an appropriate reference, such as LVDS

Application and Data Handbook published by Texas Instruments. When

the input goes high, the gate driver stage of U2 turns on the output stage,

allowing current flow through the laser diode or load.

The voltage bus for the laser diode or other load is bypassed via the

capacitor bank {C22, C23, C24, C25}. This capacitor bank is part of the main

power loop inductance, and the layout is designed to minimize the effect of

resulting parasitic inductance. The capacitor bank is fed through a relatively

small resistance formed by {R10, R11, R12, R13}. The resistance serves to

limit the laser or load current continuous value in the case of long pulses,

and also serves to damp parasitic resonance of the power loop. The bus is

further filtered via capacitors and a ferrite bead to minimize any transients

appearing at the VBUS (J8) input.

Measurements of key waveforms can be made through the MMCX test

points provided. These test points can provide waveform measurements

with equivalent bandwidths > 3 GHz. However, they have requirements

and properties that differ from most conventional oscilloscope probes.

More details on the usage of these test points is provided in section

MEASUREMENT CONSIDERATIONS.

Figure 2: Connection and measurement setup

OPERATING CONSIDERATIONS

The EPC21603 is specifically designed for high speed, short pulse

operation while minimizing the number of external parts required.

As a result, there are some additional items and limitations that should be

observed. These are discussed below.

Low VBUS operation

The first consideration is that when the IC is operated with VBUS < 10 V,

the output may miss the one or more of first few pulses of a burst, or

the first few pulses may be distorted. In many applications, this may be

acceptable, and in such cases, the IC will function with VBUS all the way

to 0 V.

Long pulse widths

The second consideration is that the IC is designs for short pulses. It is

recommended that the maximum on-time not exceed 500 ns. Longer

pulses are possible, but the output specifications are not guaranteed

under such conditions.

Pulse sources

The EPC21603 is designed to be compatible with LVDS signal sources.

If you are unfamiliar with LVDS signal levels, please refer to an

appropriate reference, such as LVDS Application and Data Handbook

published by Texas Instruments.

Clamping diodes

The EPC9156 is a dual edge control driver. When the IC U2 is turned

off, energy stored in the stray power loop inductance can cause a U2

output voltage spike that may exceed the device ratings. In order to

reduce the voltage spike, a diode-connected EPC2036 eGaN FET (Q1)

can be added to help clamp the drain node. There are also provisions

for up to two other clamping diodes D1 and D2. While diodes Q1, D1

and D2 can provide some protection to IC U2 and laser U1, they have

parasitic inductance and capacitance that can reduce performance at

the very fastest speeds. Hence, they are not populated, and it is left to

the user to determine whether they are beneficial for any particular

application. D1, D2, and Q2 locations are on the bottom side of the

EPC9156 PCB.

LASER DIODE OR LOAD CONSIDERATIONS

The EPC9156 can be used as is to mount a laser diode or other load.

Figure 3 highlights the output pad locations. However, many laser suppliers

have different mounting footprints, making it difficult to optimize

the performance of the driver and still maintain the desired flexibility.

The use of an interposer PCB provides a solution to this problem with

a small added performance penalty in the form of an additional 50 pH

to 100 pH power loop inductance. The EPC9156 ships with the EPC9989

interposer PCB, shown in Figure. 4. The EPC9989 has an assortment of

5 mm square interposer PCBs that can be snapped off the board. These

interposers have various footprints on the top side that can accommodate

several surface mount laser diodes, an MMCX connector, and several

patterns designed to accommodate a wide variety of possible loads.

These interposers mount between the EPC9156 and the laser diode or

Laser

diode

or load

VLogic VBUS

Note polarity

Signal generator

Oscilloscope

(50 Ω inputs)

– +

+ –

QUICK START GUIDE Demonstration System EPC9156

Figure 4: EPC9989 interposer. Note that this board is revised as needed to

accommodate new lasers and other loads as needed, so the picture may

not show the latest revision.

Figure 5:Laser diode mounting on output terminals with interposer.

Please note that the photograph is of the EPC9126 demo board, but

the same interposers and footprints apply to the EPC9156.

other load. The EPC9989 is updated as new lasers or loads become available,

so Figure 4 may not show the latest board. Figure 5 shows an example of an

Excelitas SMD laser diode mounted with one of the interposers.

Finally, a ground pad is made available for those who wish to use the board

for alternative applications.

The recommended use of the interposer is the following:

1. Apply solder paste to the U1 pads on the EPC9156 PCB.

2. Apply solder paste to the appropriate pads on the top side of the

interposer.

3. Place the desired interposer with the bottom side facing the top side of

the EPC9156 on the U2 footprint, making sure the pads on the bottom

of the interposer align with the footprint on top of the EPC9156 PCB.

4. Place the laser diode or desired load on the interposer, making sure the

pads on the bottom of the laser or load align with the footprint on top

of the interposer PCB.

5. Reflow the entire assembly with the recommended temperature

profile for the solder used. The use of a reflow oven that can meet the

recommended soldering specifications is highly recommended. Other

reflow methods may also be used based on the experience of the user.

The power loop inductance, including that of the laser diode, is a primary

factor that determines the shape of the laser pulse. Considerable effort

has been made to minimize power loop inductance while maximizing the

choice of laser diode and its orientation. The discharge caps, laser diode or

other load, and the eGaN FET must all be mounted in close proximity to

each other in order to minimize inductance. As a result, the user must take

care not to damage any components when mounting the laser or changing

other components in the power loop.

The EPC9156 is capable of driving laser diodes with current pulses can result

in peak powers of several tens of watts of optical power. Laser diodes for

lidar applications are designed with this in mind, but thermal limitations of

the laser package mean that pulse widths, duty cycles, and pulse repetition

frequency limitations must be observed. Read laser diode data sheets

carefully and follow any manufacturers’ recommendations.

MEASUREMENT CONSIDERATIONS

MMCX jacks are provided to measure several voltages in the circuit,

including EPC21603 IC input (J6) and output (J5) voltages, and the

charge voltage of the energy storage cap (J2). All measurement points

are designed to be terminated in 50 Ω, hence when viewing waveforms,

the oscilloscope inputs should be set to a 50 Ω input. Ideally, unused

inputs should be also terminated with a 50 Ω load to prevent the

probes from creating additional resonances. The output voltage and

the discharge cap sense voltage have on-board terminations to greatly

reduce this effect, and in practice, the remaining resonances are small

enough to ignore in most applications. It is recommended that the user

verify this for their own requirements.

Bottom

Left

Breakaway

V-grooves

SMD lasers MMCX Alternate loads

Gate driver

eGaN FET

Current

shunt

Discharge

capacitors

Laser diode

or load EPC9989

interposer Recharging

resistors

EPC9126

Figure 3: Output terminals of the EPC9156

Laser anode

Laser cathode

(FET drain)

GND (for alternate

applications)

QUICK START GUIDE Demonstration System EPC9156

All sense measurement MMCXs, except for the shunt measurement

(J1), use the transmission line probe principle to obtain waveform

fidelity at sub-ns time scales. They have been verified to produce near-

identical results to a Tektronix P9158 3 GHz transmission line probe.

As a result of their design, they have a built-in attenuation factor.

The impedance of the probes at the measurement node is relatively

small (~ 1 kΩ). In order to minimize the effects of the low probe

impedance on the operation of the demo board, the output voltage

(J5) and capacitor voltage (J2) probes have DC blocking capacitors

As a result, measured pulse waveforms will exhibit droop as pulse

widths are increased. The user should keep these factors in mind if

accustomed to more conventional oscilloscope probes.

Rev. 1 of the EPC9156 does not include a current shunt, therefor the

current shunt output J1 is not used at this time. A future revision

may include this functionality.

Table 2 summarizes the properties of the MMCX test points for ease

of reference.

NOTE. The EPC9156 demonstration board does not have any thermal

protection on board.

Table 2: Key properties of the MMCX test points for ease of reference

Designator PCB

label Description Attenuation

factor

Internal 50 Ω

termination

Attenuation

factor

J2 CAP

Bus capacitor

voltage

(VCHARGE on

schematic)

41 V/V YES YES

SHUNT

Not used Not used Not used Not used

J5 VOUT

U2 output

voltage 41 V/V YES YES

J6 VIN1

U2 input

voltage IN+ 20 V/V NO NO

J7 VIN2

U2 input

voltage IN– 20 V/V NO NO

QUICK START GUIDE Demonstration System EPC9156

Table 3: Bill of Materials - EPC9156

Item Quantity Reference Part Description Manufacturer Manufacturer Part #

1 1 PCB

213 C1, C2, C3, C4, C6, C7, C8, C9, C10,

C11, C12, C13, C16 CAP CER 0.1 μF 50 V X7R 0402 TDK C1005X7R1H104K050BB

3 3 C5, C14, C15 CAP CER 5 pF 50 V C0G 0402 TDK C1005C0G1H050C050BA

4 4 C17, C18, C19, C20 CAP CER 1 μF 100 V X7S 0805 TDK CGA4J3X7S2A105K125AB

5 2 C21, C26 CAP CER 4.7 μF 25 V X5R 0603 TDK C1608X5R1E475K080AC

6 5 C22, C23, C24, C25, C27 CAP CER 1 μF 50 V X7R 0603 Taiyo Yuden UMK107AB7105KA-T

7 2 D1, D2 DIODE SCHOTTKY 100 V 200 mA SOD523 ST MIcroelectronics BAT41KFILM

8 1 FB1 FERRITE BEAD 50 Ω 1206 12A 1LN Murata BLM31SN500SN1L

9 1 FB2 FERRITE BEAD 330 Ω 0402 0.7 A 280 mΩ TDK MPZ1005S331ET000

10 7 J1, J2, J3, J4, J5, J6, J7 Molex 734152063

11 2 J8, J9 3.81 mm 2 pos. Euro Block Tyco 1776113 -2

12 8MB1, MB2, MB3, MB4, MB5, MB6,

MB7, MB8 5 hole Mouse Bites N/A N/A

13 1Q1 100 V 73 mΩ 1.7 A EPC EPC2036

14 1R2 RES SMD 49.9 Ω 1% 1/10 W 0402 Panasonic ERJ-2RKF49R9X

15 1R3 RES SMD 0 Ω JUMPER 1/20 W 0201 Panasonic ERJ-1GE0R00C

16 4 R4, R5, R6, R7 RES SMD 1 Ω 1% 1/5 W 0402 Vishay Dale CRCW04021R00FKEDHP

17 2R8, R15 RES SMD 1K Ω 1% 1/10 W 0402 Panasonic ERJ-2RKF1001X

18 2R9, R13 RES SMD 0 Ω JUMPER 1/16 W 0402 Yageo RC0402JR-070RL

19 1R10 RES SMD 1.8K Ω 1% 1/10 W 0402 Panasonic ERJ-2RKF1801X

20 2R11, R16 RES SMD 49.9 Ω 1% 1/20 W 0201 Yageo RC0201FR-0749R9L

21 1R12 RES SMD 100 Ω 1% 1/10 W 0402 Yageo RC0402FR-07100RL

22 3 R14, R23, R24 RES SMD 1K Ω 1% 1/10 W 0402, RES SMD 0 Ω JUMPER 1/10 W 0402 Panasonic ERJ-2RKF1001X, ERJ-2GE0R00X

23 2R17, R18 RES SMD 953 Ω 1% 1/10 W 0402 Panasonic ERJ-2RKF9530X

24 6TP1, TP2, TP3, TP4, TP5, TP6 Keystone 5015

25 1U2 40 V 10 A 60 mΩ FET with integrated driver, 5 V VDD LVDS logic in EPC EPC21603

26 1U3 5.0 V 250 mA DFN MicroChip MCP1703T-5002E/MC

27 1U4 Linear Regulator 3v3 500 mA 6-WSON (2x2) Texas Instruments TLV755XXPDRVR

A mmmm mmmm m e A: LIV Olv LIV OLV Olv |=|v LTlv i C |v i LIV Dr LIV ml v

QUICK START GUIDE Demonstration System EPC9156

Figure 6: Schematic EPC9156 (part1)

V5V0

OUT

GND

Logic Supply

Main Supply Input

N/A

FD1

Local Fiducials

N/A

FD2

N/A

FD3

Vlogic

1 μF

50 V

C22

1μF

50 V

1μF

50 V

C23 C24

VBUS

TP3

TP5

1μF 100 V

C17

1μF 100 V

C18

1μF 100 V

C19

1μF 100 V

C20

4.7 μF

25 V

C21

3.81mm TH

N/A

EN GND

OUT

NCNC

1 μF 50 V

C27

4.7 μF 25 V

C26

V3V3

TP6

V5V0 1 μF 50 V

C25

TP4 0 Ω

0 Ω 0.1W

R23

0 Ω

0 Ω 0.1W

R24

N/A

HOLE1

N/A

HOLE2

N/A

HOLE3

N/A

HOLE4

ATTENTION

ELECTROSTATIC

SENSITIVE DEVICE

ms; 9mm mm m 9 O W m 9 {D W m n

QUICK START GUIDE Demonstration System EPC9156

Figure 7: Schematic EPC9156 (part 2)

Vout

Vdrain

TP2

VCHARGE

TP1

VIN1

Signal Input sense

Shunt voltage sense

Discharge cap voltage sense

CAP

SHUNT

Z 50 single core

iGD prop delay

Drain voltage sense

BAT41KFILM

100 V, 200 mA

EMPTY

BAT41KFILM

100 V, 200 mA

EMPTY

Z 50 single core

0402

49.9 0.1 W

Capacitor Recharge

Discharge capacitor

Laser (or alternate load)

Optional drain clamp

VBUS ISENSE

100 nF 50 V

50 Ω @ 100 MHz 12 A

FB1

100 V 73 mΩ 1.7 A

EMPTY

VBUS1

0402

1 k 0.1 W

0402

1 k 0.1 W

R15

0201

49.9 1/20 W

R16

0201

49.9 1/20 W

R11

0201

0 Ω 1/20 W

100 nF 50 V

VP1

Vdrain

VBUS1

VCHARGE

5 pF 50 V

100 nF 50 V

C10

100 nF 50 V

C1 1

100 nF 50 V

C12

100 nF 50 V

C16

0402

953 0.1 W

R18

330 Ω @

100 MHz 0.7 A

FB2 1 4

2 3

V5V0

Gate

Drive

VDD

GND

EPC21603

0402

1 1/5W

0402

1 1/5W

0402

1 1/5W

0402

1 1/5W

Z 50 single core

VDD

IN+

GND

IN-

40 V 10 A 60 mΩ FET with integrated driver, 5 V VDD LVDS logic in

VP2

VP1

Z 50 single core

C14

5 pF

50 V

5 pF

50 V

C15

V3V3

100 nF

50 V

100nF 50V

C13

1 k

0.1W

R14

FB2

0402

100 Ω

1/16W

R12

0402

1.8 k 0.1 W

R10

V5V0

0402

0 Ω 1/16 W

0402

0 Ω 1/16 W

R13

EFFIEIENT POWER (ONVERSION l

EPC Products are distributed through Digi-Key.

www.digikey.com

For More Information:

Please contact info@epc-co.com

or your local sales representative

Visit our website:

www.epc-co.com

Sign-up to receive

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bit.ly/EPCupdates

or text EPC to 22828

Demonstration Board Notification

The EPC9156 board is intended for product evaluation purposes only. It is not intended for commercial use nor is it FCC approved for resale. Replace components on the

Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Quick Start Guide. Contact an authorized EPC representative with any questions. This board is

intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk.

As an evaluation tool, this board is not designed for compliance with the European Union directive on electromagnetic compatibility or any other such directives or regulations. As board

builds are at times subject to product availability, it is possible that boards may contain components or assembly materials that are not RoHS compliant. Efficient Power Conversion Corpora-

tion (EPC) makes no guarantee that the purchased board is 100% RoHS compliant.

The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this Quick Start Guide constitute a sales contract or create any kind of warranty, whether express

or implied, as to the applications or products involved.

Disclaimer: EPC reserves the right at any time, without notice, to make changes to any products described herein to improve reliability, function, or design. EPC does not assume any liability

arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, or other intellectual property whatsoever, nor the

rights of others.

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