iC-NZ

FAIL-SAFE LASER DIODE DRIVER

Rev B2, Page 7/20

ELECTRICAL CHARACTERISTICS: DIAGRAMS

t

V

Vt()hi

Vt()lo

VDD−0.45V

0.45V

0

1

Input/Output

Figure 1: Reference levels

I(LED)

t

Figure 2: Laser current pulse

LENL

LENM

LENH

I(LDKL)

plh

Zeit

I(LDKM)

I(LDKH)

V(MDL)

t

plh

t

plh

t

phl

t

phl

tt

phl

t

Figure 3: Turn on/turn off behavior of the laser current

LENL

ENCAL

LENM

LENH

VSL

Zeit

V(SMD)

V(MDL)

VSH

P(Laser)

SMD(1)

SMD(0)

NERR

NSEN

NTREN

Zeit

Zeit

0.5V

Ph

S0

Pm

Pl

t

S1

t

t

off

t

d

Figure 4: Safety shutdown times with failure of the control unit, for example