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ELM185BB-S Datasheet(PDF) 6 Page - ELM Technology Corporation

Part # ELM185BB-S
Description  ELM185xB Laser Diode Driver
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Manufacturer  ELM-TECH [ELM Technology Corporation]
Direct Link  http://www.elm-tech.com
Logo ELM-TECH - ELM Technology Corporation

ELM185BB-S Datasheet(HTML) 6 Page - ELM Technology Corporation

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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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