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22

LDD P SERIES LASER DIODE DRIVER

TyPicaL PeRfoRmance gRaPhs

Ldd 1P: noT in cuRRenT LimiT

Power Supply Voltage

Output Current

Soft start

Horiz Div = 100 ms

Figure 36. Typical Soft Start Timing

(current setpoint at 100% full scale)

Modulation Input

Output Current

Horiz DIv = 10 µsec

Figure 37. 10 kHz square wave response

Modulation Input

Output Current

+5 V

0

Full

Scale

0

Horiz DIv = 100 nsec

t rise

Figure 38. 10 kHz square wave rise time

Power Supply Voltage

Output Current

Soft start

Horiz Div = 100 ms

Figure 39. Typical Soft Start Timing

(current setpoint at 10% full scale)

Figure 40. Large signal frequency response

(Gain normalized to output at 10 Hz)

Modulation Input

Output Current

+5 V

0

Full

Scale

0

Horiz DIv = 100 nsec

t fall

Figure 41. 10 kHz square wave fall time

NOTE: Keep Operating Setpoint Below Current Limit Setting. These graphs do not represent the LDD P performance while

the Current Limit Circuit is triggered.

WARNING: The Current Limit Circuit is not an absolute/failsafe clamp. If the operating setpoint exceeds the limit setting,

and a fast modulation signal is input, very short overshoots of the current limit are possible (150 nsec). If the photodiode

feedback signal is lost or very slow, the LDD P can drive to its maximum output current.