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FEATURES

? Wide Input Voltage Range: 5V ～ 14V

? Wide Output Voltage Range: 0.2VVPS to 0.8VVPS

(input voltage)

? Maximum Output Current: 6A

? High Efficiency: ≥90 - no heat sink is needed

(IOUT=6A@VLDA=10V & VVPS=14V)

? Wide Modulation Bandwidth: DC ～ 4kHz

? Dual Independent Current Set Ports: LISH and LISL

? Direct Digital Modulation Control: PCN

? Three Control States: Shutdown, Standby and

Operation

? Low Output Current Noise: 8.02μAP-P @0.1Hz~10Hz

? High Current Stability: < ±600μA@6A &?20°C~80°C

? Low Output Ripple Voltage: < 6mV@500kHz

? Fully Shielded

? Both DIP and SMT Packages Available

? Compact Size: 27.4×21×5.7 (mm)

? 100 Lead (Pb)-free and RoHS Compliant

DESCRIPTION

This laser driver, ATLS6A214, is an electronic module that

has all the valuable and important, but often difficult to

achieve simultaneously, features simultaneously: wide

input and output voltage range, high output current

capability, high efficiency, low output noise (but it has an

output 4mVp-p ripple voltage at 500kHz), wide modulation

bandwidth, and small size. The wide output voltage range,

0.2VVPS ~ 0.8VVPS, allows driving one or multiple serial

laser diodes at the same time, for up to 6A well controlled

current at high efficiency. The extremely low noise

between DC ~ 4kHz and low DC current drift make it ideal

for driving diode pumped single mode laser diodes to

achieve mode-hop-free and narrow optical wavelength drift,

thus, long coherent length. Because of the high efficiency,

the laser driver generates small amount of heat, thus, no

heat sink is necessary for normal operation. The fully

shielded case blocks all the incoming and outgoing EMIs

(Electro-Magnet Interferences). Therefore, this laser will

not interfere other surrounding electronics, nor will be

interfered by them. The small package saves valuable PCB

space in laser systems. Figure 1 shows physical photo of

the ATLS6A214D.

This laser driver has two current set ports digitally

controlled to switch between them for setting the output

current. This feature allows modulating the laser digitally

with 2 preset current values.

The actual laser current and laser driver temperature are

monitored by dedicated ports. In case the laser driver

temperature exceeds the limit, 120°C, the laser driver will

shut down the output stage by itself and force the laser

drive into Standby Mode. There is a loop good indication

output to tell if the laser driver works ok.

The laser driver has 3 states: Operation, Standby and

Shutdown. Under Standby mode, all the laser driver

components works except the output stage, see Figure 4.

Under Shutdown mode, all the components of the laser

driver stops working and the power supply current is

reduced to < 3μA.

This laser driver generates a high accuracy high stability

low noise, 5μVP-P, < 1μVRMS, < 8ppm/°C, 2.5V < ±2mV,

voltage reference output which can be used for setting the

output current and also be used as the reference voltage for

the ADCs (Analog to Digital Converters) and/or DACs

(Digital to Analog Converters).

The ATLS6A214 uses a constant frequency high efficiency

PWM output stage. Its switching signal is taken out

through a buffer at the SYNO port, pin 1, which can be

used by other switch mode electronics as the trigger signal

to avoid frequency beating interference, if the free-run

frequency is around 500kHz.