FEATURES
 Wide Input Voltage Range: 8.5V ∼40V
 Wide Output Voltage Range: 0.1×VVPS to 0.8×VVPS
(input voltage)
 High Current Capability: 25A
 High Efficiency: ≥95%
(IOUT=25A@VLDA=30V&VVPS=40V)
 Wide Modulation Bandwidth: DC ∼ 10kHz
 Compact Size: 54.28(L)×54.28(W)×15.20(H) (mm)
 Dual Independent Current Set Ports: LISH and LISL
 Direct Digital Modulation Control: PCN
 Three Control States: Shutdown, Standby or Operation
 Low Output Current Noise: <20μAP-P@0.1Hz~10Hz
 High Current Stability: <±20mA@25A&(‒20°C~80°C)
 Low Output Ripple Voltage: <10mVP-P@500kHz
 Fully Shielded
 100 % Lead (Pb)-free and RoHS Compliant

DESCRIPTION
This laser driver, ATLS25A219D, 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 10mVp-p ripple voltage
at 500kHz), wide modulation bandwidth, and small size. The
wide output voltage range, 0.1×VVPS ~ 0.8×VVPS, allows
driving one or multiple serial laser diodes at the same time, for
up to 25A well controlled current at high efficiency. The
extremely low noise between DC 0.1Hz ~ 10Hz and low DC
current drift make it ideal for driving high current laser diode
arrays. Because of the high efficiency, the build-in small heat
sink is sufficient to dissipate the heat generated by the driver, no
additional heat sink is needed. 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 ATLS25A219D.
This laser driver has two current set ports which can digitally be
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 is
monitored by dedicated port. 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 well.
The laser driver has 3 states: Operation, Standby and Shutdown.
Under Standby mode, all the laser driver components will be
working except the output stage, see Figure 4. Under Shutdown
mode, all the components of the laser driver stop working and
the power supply current is reduced to < 2mA.
This laser driver generates a high accuracy high stability low
noise. When outputting 25A to the laser, the noise current is
20μAP-P, noise voltage at the output node, LDA, is <2μVRMS,
output current stability is <100ppm/°C, It comes with a low
noise high stability voltage reference 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 ATLS25A219D uses a constant frequency high efficiency
PWM output stage. Its switching signal is taken out through a
buffer at the SYNO port, pin 10, 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.