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: 63.0(L) × 61.0(W) × 16.7(H) (mm)
 Dual Independent Current Set Ports: LISH or LISL
 Direct Digital Modulation Control: PCN
 Three Control States: Shutdown, Standby and 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, ATLS25A219GUI, 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 ~ 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 foot print of this laser driver saves
valuable space for the laser system. Figure 1 shows physical
photo of the ATLS25A219GUI.
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 7. 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).
For noise sensitive applications, please be aware that this laser
driver has very low noise between DC to 10Hz, but there is a
500kHz sine-wave ripple voltage, around 10mVpp, present at
the output, the LDA port.