iC-NZ
FAIL-SAFE LASER DIODE DRIVER
Rev B2, Page 7/20
ELECTRICAL CHARACTERISTICS: DIAGRAMS
V
Input/Output
VDD−0.45V
Vt()hi
LENL
Vt()lo
0.45V
LENM
t
1
0
LENH
Figure 1: Reference levels
I(LDKL)
I(LED)
t
phl
I(LDKM)
t
plh
t r
t f
Ipk
t
plh
t
phl
I(LDKH)
V(MDL)
90% I
pk
t
t
phl
plh
10% I
pk
t
Zeit
Figure 2: Laser current pulse
Figure 3: Turn on/turn off behavior of the laser current
ENCAL
LENL
LENM
LENH
P(Laser)
Ph
Pm
Pl
Zeit
V(MDL)
0.5V
Zeit
V(SMD)
VSH
VSL
Zeit
SMD(0)
SMD(1)
tS0
tS1
t
d
NERR
NSEN
NTREN
t
off
Figure 4: Safety shutdown times with failure of the control unit, for example
ICHAUS [ IC-HAUS GMBH ]
