10A High Efficiency Laser Controller ATLD10A5 - Analog Technologies, Inc. - #1

and laser power or voltage. Its efficiency is so high that no heat sink is needed even outputting a 10A current.

The output control has two modes: constant current and constant power or constant voltage. For most applications, constant current is utilized. The constant power or voltage can be used for as a protection tier. For the applications requiring constant power control, the constant current loop can be used as a protection tier. In this way, in case there is a failure in control loop, and other one can still protect valuable laser diode.

The output current is monitored by an analog output voltage linearly, making it convenient for the users to monitor the output current without breaking the output circuit.

This module can also be used as a low noise and well protected DC-DC converter. This is done by setting the controller into constant voltage control and using the current loop as the protection tier.

A loop status pin, LPGD (pin 4) indicates weather the control loop is working properly, i.e., that output parameter equals the set-point parameter. For current mode control, the output current equals the set-point current; under power mode, the output power equals the set-point voltage; under voltage mode, the output voltage equals the set-point voltage.

The constant power or voltage is realized by feeding the measured signal into the laser monitor pin, LMIN (pin 10) and the set-point value for the signal is set by the LMS pin

(pin 9).

It is worth noting that the controller's output noise is located in two spectrums:

A. Low frequency. It ranges from DC to 10Hz.

B. High frequency. It is the multiple harmonics of the switching frequency of the PWM (Pulse Width Modulation) output stage: 500KHz.

The ATLD10A5 comes with a highly stable low noise 4V reference voltage which can be used for setting the output current, the current limit, the output voltage and the voltage limit. It can also be used as the reference voltage for external ADCs and/or DACs.

The controller is housed inside a 6 sided metal enclosure, which blocks EMIs from reaching out and disturbing other nearby electronics and, at the same time, prevents the module from being interfered by EMIs from other electronics.

A5.5V 100mA power supply is provided for powering external electronic circuits (if there is any).

The controller has 2 versions for mounting on the PCB: through hole mount or surface mount.

High Output Current: 10A

High Efficiency: 97% - No Heat Sink Required

High Stability: < 100ppm/°C

Dual Mode Control: Current and Power or Voltage

Very Low Noise: < 0.05%

Zero EMI

Compact Size: 39x34x8 (mm) SMT and DIP Package

Drive diode lasers, heaters & TECs, and can be used as DC-DC voltage converter as well.

Figure 1 Top View of ATLD10A5

Figure 2 Typical Application Connection

The ATLD10A5 is an electronic module designed for driving high current diode lasers with well controlled output current

550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com

© Copyrights 2000 - 2008, Analog Technologies, Inc. All Rights Reserved. Updated on: 11/19/2008 1