Description
1. Drive circuit application function
1)Dual circuit temperature control circuit, includingLDInternal temperature control precision control and externalTECAuxiliary control function. The internal high precision temperature control makes the output wavelength stable. The external temperature control makes the temperature difference between the laser and the environment too high.LDIt is still in a long-term high performance steady state.LDHeat dissipation is too slow to cause control or even damage of temperature controlLD.
2)LDCurrent control. It has internal adjustment bias current and external input modulation voltage to control the current waveform function.I LD = IOFFSET+ Vin * G;(GFor conductance, parameters see interface description)
Two. Drive circuit protection function
1) electrostatic protection:LDDuring the period of no operation, the cathode and anode are protected from electrostatic hazards, and the pins are short circuited.
2Overcurrent protection: the maximum protection current can be set.Overcurrent indication
3) surge voltage protection:LDDuring operation, it is protected from surge (transient, pulse) voltage.TVSTube protection;
4) reverse voltage protection:LDDuring operation, it is protected from reverse voltage. (parallel Schottky diode).
5) soft start: At the moment of electricity,LDThe current should be monotonous and slow.
6) soft turn off: power off moment,LDThe current needs to be monotonous and slow down
7TECProtection: short circuit and circuit breaker of thermistorTECShut off
Three. Electrical performance requirements
Output current range:
0-200mA(small current edition)0-10mA
Output current noise:
10MuA(small current edition)1MuA
Ambient temperature range-10DegreeC-60DegreeC
Temperature control range: 0-50 (c)
Control accuracy: 0.02 C (reflected to TDLAS system for long time absorption peak stability)
input voltage – Current conversion coefficient1V – 66.6mA(small current edition)1V – 3.33mA
TEL-1-5-9-0-0-2-0-8-0-8-4
