FEATURES
 Wide Input Voltage Range: 5.5V ∼15V
 Wide Output Voltage Range: 0.2VVPS to 0.8VVPS
(input voltage)
 High Current Capability: 12A
 High Efficiency: ≥90%
(IOUT=12A@VLDA=10V&VVPS=15V)
 Wide Modulation Bandwidth: DC ∼20kHz
 Compact Size: 27.4×21×5.7 (mm)
 Dual Independent Current Set Ports: LISH and LISL
 Direct Digital Modulation Control: PCN
 Three Control States: Shutdown, Standby and Operation
 Low Output Current Noise: < 12μAP-P@0.1Hz~10Hz
 High Current Stability: < ±600μA@12A &‒20°C~80°C
 Low Output Ripple Voltage: < 6mV@700kHz
 Fully Shielded
 100 % Lead (Pb)-free and RoHS Compliant

DESCRIPTION
This laser driver, ATLS12A216, is an electronic module that
has all the valuable and important, but often difficult to
achieve simultaneously, features: 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 700kHz), wide modulation bandwidth, and small size. The
wide output voltage range, 0.2VVPS to 0.8VVPS, allows driving
one or multiple serial laser diodes at the same time, for up to
12A well controlled current at high efficiency. The extremely
low noise between DC ~ 20kHz 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 high current, the laser
driver generates a large amount of heat, thus, a 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 ATLS12A216D.
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 ATLS12A216 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 700kHz.