1161 Ringwood Ct, #110, San Jose, CA 95131, U. S. A. Tel.: (408) 748-9100, Fax: (408) 770-9187

www.analogtechnologies.com

Copyrights 2000-2022, Analog Technologies, Inc. All Rights Reserved. Updated on 1/25/2022

Email: staff@analogti.com/sales@analogti.com

3

Analog Technologies

Evaluation Board for ATLS201D

ATLS201DEV1.0

Some of the pins are also connected to the connectors of the

4 terminal blocks, and/or the soldering pads on the edges of

the board. The names of all these nodes are marked on the

board.

Please notice that when the board is working, the 5 diodes

on the top center may get hot, therefore, avoid touching

them with your fingers.

The schematic is shown in Figure 7 below.

VPS

SDN

2.5VR

LIS

LIO

LIGD

AMMTR+

AMMTR-

LDA

LDC

1

2

D1

1

2

D3

1

2

D5

1

2

D2

1

2

D4

LDA

AMMTR+

AMMTR-

1

2

RNP

LDC

VPS

12

PGND

11

LDC

10

LDA

9

LIGD

8

GND

7

SDN

1

LDGD

2

GND

3

2.5VR

4

LIS

5

LIO

6

Laser Driver

ATLSXA201D

1

2

R5

499

VPS

1

Q1

MMBT6428

2

1

D6

LED

LDGD

1

2

R6

49.9K

SDN

1

SDN

1

LDGD

LDGD

1

GND

2

W1

10K

1

2.5VR

1

LIS

2.5VR

LIS

1

LIO

LIO

1

VPS

VPS

1

PGND

1

LDA

1

LDC

1

LIGD

1

GND

C2

1uF

LDA

LDC

LIGD

LDGD

R4

NP

1

2

TB2

S1

1

2

R1

10K

C1

47uF

1

2

S3

1

2

S2

1

2

S4

1

2

S5

1

2

S6

1

2

S7

1

AMMTR+

1

AMMTR-

1

2

R2

10K

PGND

1

2

3

4

5

6

7

8

TB1

1

2

3

4

5

6

TB3

PGND

GND

GND

LDA

1

LDC

TB4

FAN+

FAN-

FAN

1

2 R7

0

VPS

PGND

1

2

R3

100

S8

Figure 7. Schematic of Laser Driver ATLS201D Evaluation Board Rev. 1.0

GETTING STARTED

1. Hook up the power supply. There are 2 solder pads in the

upper center area on the edge for connecting the power

supply. The connection can be done by clipping or

soldering on the pads, or locking in 2 wires through the

terminal block TB2 by using the screws, see Figure 1.

Usually the power supply is set to 5V. If the output

maximum voltage is sure to be always at low value, such

as 2.5V, a power supply with a voltage of about 1V higher

than the maximum output voltage, i.e. 3.5V, can be used.

When using a lower voltage power supply, the power

consumption of the driver will get smaller, thus, the driver

will be working under lower temperature rise.

2. Check the voltage reference. Use a voltmeter to check the

voltage reference pin 2.5VR having an accurate 2.5V.

3. Turn on and off the driver. This can be done by either

turning off the power supply or turning off the shut-down

pin of the driver. To do the latter, turn the switch S1H to

its upper position to turn off the driver, which shorts

circuit the shutdown pin SDN to the ground, or turn the

switch S1H to its lower position to turn on the driver.

4. Monitor the output curre by using the LIO pin voltage.

Measuring the voltage of the LIO pin by using a voltmeter

(measure between the LIO pin and the ground node) will

allow monitoring the output current. The relationship

between the LIO voltage and the output current is linear:

X is maximum output current, 2A, 4A or 6A;

LIO stands for the voltage at the LIO pin.

5. Monitoring the output current directly by using an

Ammeter. Measure the voltage of LIO pin as described

above, then compare the approach with the measured

current. Measuring the output current directly by using an

Ammeter is not recommended when a real laser is

connected, because these potential problems:

A. The Ammeter brings in EMI (Electro-Magnetic

Interference) noise.