iC-NZ
FAIL-SAFE LASER DIODE DRIVER
Rev B2, Page 13/20
VDD
REGEN
LENL
LENM
LENH
SDIS
VDD
RVDD
LDA
VDD
C1
Safety
Monitor
Diode
Current Monitor
S1
RSI
EN
RSI
LDAOK
NTREN
NSEN
LD MD
Finite State Machine
NSEN
LDKH
RMDH
CIH
VREF
VREF
VREF
Safety Monitor Diode
+
−
MDL
CIH
Laser Driver
APC
RMDM
LDKM
SMD
+
SMD(1)
SMD(0)
MDL
MDOK
+
−
CIM
−
VSAH
Monitor
+
RSMD
−
LDKL
CIL
VSAL
RGND
+
−
MDL
AGND
VREF
GND
RML
CREF
Figure 8: One-channel operation with safety function (N-type laser diode)
VDD
LENH
REGEN
LENL
LENM
SDIS
VDD
RVDD
LDA
VDD
RSI
Current Monitor
C1
S1
RMDH
CLDA
RSI
LDAOK
NTREN
NSEN
MDL
EN
Finite State Machine
RMDM
RMDH
NSEN
LDKH
CIH
SMD
VREF
VREF
VREF
Safety Monitor Diode
+
MDL
LD MD
−
CIH
Laser Driver
APC
LDKM
CIM
SMD
+
SMD(1)
SMD(0)
MDL
+
−
−
MDOK
VSAH
RSMD
Monitor
+
−
LDKL
CIL
VSAL
RGND
+
−
AGND
GND
CREF
Figure 9: One-channel operation with safety function (P-type laser diode)
ICHAUS [ IC-HAUS GMBH ]
