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ELM185BB-S Datasheet(PDF) 6 Page - ELM Technology Corporation |
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ELM185BB-S Datasheet(HTML) 6 Page - ELM Technology Corporation |
6 / 10 page 6 Parameter Symbol Min. Typ. Max. Unit Action current Iop - 35 50 mA Monitor current Im 0.05 0.10 0.30 mA Typical Electric characteristics of LDM No. parts Recommended absolute ratings Notes R1 *1 fixed resistor 1.0kΩ LD output adjustment VR1 *2 adjustable resistor 5.0kΩ LD output adjustment R2 *3 fixed resistor 3.3Ω current limit setting (no limit under 0Ω) C1 ceramic capacitor 3300pF control loop stabilization C2 electrolysis, ceramic, etc. 1μF to 100μF power stabilization Tr1 Tr2 PNP transistor small signal transistor monitor current mirror circuit table 1 Recommendation of absolute ratings of each circuit when using the LDM of table 1 table 2 * 1 R1=0.3/ Im (Max.) * 2 (R1 + VR1) = 0.3/ Im (Min.) * 3 R2=0.15/ Iop (Max.) For pulse drive, please add resister to AMD pin in circuit (1) to control signal of pulse drive. Adjustable resistor (VR1) is inserted in the place as shown above in order to adjust monitor current; pulse drive control signal shall be added between R1 and VR1. R3: resistor of the input of pulse drive control signal. VCC is set to be higher than Vamd=0.30V(Typ.) VCC * R1 / (R3 + R1) > Vamd e.g.) when VCC=3.3V, R1=1kΩ, R3 < R1 * (VCC-Vamd)/Vamd = 1kΩ * (3.3-0.3)/0.3 = 10kΩ. The control signal is logic level; laser light will be switched off when the signal is H and switched on when it is L. * * * * ■Application circuit example 2 (Pulse drive circuit) For application circuit of intermittent diode output controlled by external signal, please refer to application circuit (4). Max. frequency can set to be on/off by limit of response speed of laser diode output control loop is 20kHz.By using logic gate, the control of on/off is easy; it is required that the resistances of R1, R3 and VR1 are much larger than the output resistance of logic gate. circuit (4) ELM185xB Laser Diode Driver 10 - ELM185xB D1 LD MD D2 C2 V1 ILM GND VCC KLD AMD LDM R1 VR1 CMP R2 C1 R3 Pulse in |
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