EPC EPC9144 빠른 시작 매뉴얼 - 페이지 2

{카테고리_이름} EPC EPC9144에 대한 빠른 시작 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. EPC EPC9144 9 페이지. Development board for a 15 v high current pulsed laser diode driver

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QUICK START GUIDE

DESCRIPTION

The EPC9144 development board is primarily intended to drive laser

diodes with high current pulses with total pulse widths as short as 1.2 ns

and currents of up to 28 A. The board is designed around the EPC2216

enhancement mode (eGaN®) field effect transistor (FET). The EPC2216

is an AEC-Q101 automotive qualified 15 V FET capable of current pulses

up to 28 A. The EPC9144 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 while still being able to use the EPC9144. Laser diodes or other

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

The EPC9144 comprises a ground-referenced EPC2216 eGaN FET driven

by a Texas Instruments LMG1020 gate driver. 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 con-

nections for input and sensing. In addition, the board includes a narrow

pulse generator capable of sub-nanosecond operation, or the user can

simply feed the gate drive directly via removal of a resistor. As shipped,

the board is designed to operate from 3.3 V logic, but is equipped with

both a logic level translator and a differential receiver to accommodate

different use cases. Finally, the board can also be used for other applica-

tions requiring a ground-referenced eGaN FET, e.g. Class E amplifiers or

similar. A complete block diagram of the circuit is given in figure 1, and a

detailed schematic in figure 4.

For more information on the EPC2216 eGaN FETs, please refer to the data-

sheet 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 EPC9144 is easy to set up to evaluate the perfor-

mance of the EPC2216 eGaN FET. 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 +V

ground / return to –V

BUS

4. With power off, connect the logic supply (7-12 V V

and ground return to –V

5. With power off, connect the signal pulse generator to the input J5. J5

is terminated with 50 Ω on the EPC9144, and is designed for a 3.3 V

logic input as shipped. This can be changed as discussed in this guide.

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.

EPC – THE LEADER IN GaN TECHNOLOGY |

(J1) or GND.

) to +V

(J2) or GND.

Logic

WWW.EPC-CO.COM

Table 1: Performance Summary (T

Symbol

Gate drive and

Logic

Bus input voltage

BUS

Input impedance

Input pulse range

INPUT

Input pulse width

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

peak power optical pulses. Such pulses are capable of creating permanent vision

damage. User must follow proper laser safety procedures to prevent vision damage.

BUS

–

Input (J5)

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.

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

(J1) and

BUS

outputs and any additional desired probing. Laser diode output

may be observed with an appropriate electro-optical receiver.

(J2)

Logic

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: When measuring the high frequency content switch node, care must be

taken to avoid long ground leads. Measure the switch node by placing the

oscilloscope probe tip through the large via on the switch node (designed for this

purpose) and grounding the probe directly across the GND terminal provided.

See

EPC measurement applications note.

Demonstration System EPC9144

= 25°C) EPC9144

Parameter

Conditions

logic supply

range

J5 input

CAP (J6)

Narrow pulse

generator

(optional)

(J9)

LDO

–

Figure 1: Block diagram of EPC9144 development board

Min

Nom Max Units

12*

clmp

(J7)

OUT

(J10)

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