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.