iC-NZ
FAIL-SAFE LASER DIODE DRIVER
Rev B2, Page 16/20
LENH
LENM
REGEN
LENL
SDIS
VDD
VDD
LDA
C1
Current Monitor
RSI
EN
Laser Driver
RSI
LD MD
NSEN
LDAOK
RSIOV
CLDA
NTREN
LDKH
MDOK
CIOK
LDKM
LDKL
Finite State Machine
ENCAL
NERR
LDKGND
NSEN
CIH
NSF
CIH
CIM
CIM
CIL
NPDR
TEMPOK
CIL
MDL
Safety Monitor Diode
RMDH
RMDM
VBG
and
Reference
VBG
and
Reference
SMD
+
−
SMD(1)
SMD(0)
VSH
VSL
RMH
RMM
RML
+
−
RGND
VREF
Figure 13: Operation without a second monitor diode (N-type laser diode)
LENH
LENM
REGEN
LENL
SDIS
VDD
VDD
RSI
LDA
RVDD
C1
Current Monitor
Laser Driver
RSI
RMH
RMM
RML
NSEN
LDAOK
RSIOV
CLDA
NTREN
MDOK
EN
CIOK
RMDH
ENCAL
NERR
Finite State Machine
LDKGND
RMDM
MDL
NSEN
NSF
NPDR
TEMPOK
LD
MD
Safety Monitor Diode
LDKH
VBG
and
VBG
and
LDKM
LDKL
Reference
Reference
SMD
+
−
SMD(1)
SMD(0)
CIH
VSH
VSL
+
−
CIM
CIL
CIH
CIM
CIL
VREF
Figure 14: Operation without a second monitor diode (P-type laser diode)
ICHAUS [ IC-HAUS GMBH ]
