Koheron DRV200 Series, DRV200-A-40, DRV200-A-400, DRV200 User Manual

DRV200 - User Guide

Quickstart

1. Turn the setpoint potentiometer counter-clockwise to set the current to 0 mA.

2. Connect the pins VCC and GND to a 5 V power supply. Thanks to the very high power supply rejection of the
DRV200, a switched power supply can be used without degrading the noise performance. However, the current
limit functionality of lab power supplies can be useful.

3. (Optional) Connect a 1 Ω resistor between the LD+ and LD- pins. The current flowing across the resistor can be
measured at the IMON pin (2 V = 100 mA for DRV200-A-200, 100 mV = 1 mA for DRV200-A-40). Turn the
potentiometer clockwise until you reach the desired current.

4. Turn off the power supply and connect your laser between LD+ and LD- pins.

The DRV200 is designed for operation with floating laser diodes, i.e. that neither the anode nor the cathode is
connected to the case. If your laser anode or cathode is internally connected to the case (grounded anode or
grounded cathode), make sure that the laser case is isolated from the ground.

5. Turn on the power supply and adjust the potentiometer

Jumper configuration

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Current modulation

The DRV200 can be modulated from DC to 6 MHz using the SMA connector. The MOD GAIN jumper is used to select
between 3 modulation gains:

DRV200-A-40

Low: 200 µA/V
Medium: 2 mA/V
High: 20 mA/V

DRV200-A-200

Low : 1 mA/V
Medium: 10 mA/V
High: 100 mA/V

DRV200-A-400

Low : 2 mA/V
Medium: 20 mA/V
High: 200 mA/V

Modulation range is ±1 V and input impedance is 50 Ω.

Supply voltage selection

Set the VCC jumper according to the voltage supply used (5V or 6V). Using a 6V supply provides 1 V of extra
compliance voltage.

Current limit selection

The ILIM jumper can be used to switch between two current limit values:

DRV200-A-40

Low: 32 mA
High: 48 mA

DRV200-A-200

Low: 160 mA
High: 240 mA

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