iC-NZ

FAIL-SAFE LASER DIODE DRIVER

Rev B2, Page 6/20

ELECTRICAL CHARACTERISTICS

Operating Conditions: VDD = 3.5...5.5 V, Tj = -20...85 °C; x: L, M, H, unless otherwise stated

Item

Symbol

Parameter

Conditions

Unit

No.

Min.

Typ.

Max.

407

C(CIx)

Capacitance at CIx

100

nF

408

|I(CIx)|

Charge Current from CIx

iC active, control unit not yet settled

0.25

0.6

1

mA

409

I(CIx)

Discharge Current in CIx

iC inactive, V(CIx) > 1 V

10

60

mA

410

Ipd(CIx)

Pull-Down Current in CIx

iC active, REGEN = lo

25

150

nA

411

I(RMDx)

Permissible

Laser Monitor Diode Current

active safety function;

VDD = 5 V

2.5

mA

VDD = 3.3 V

1

mA

Status Outputs

501

I(NERR)

Current at Error Message

V(LDA) = V(VDD) = V(NERR), error state

1.5

10

mA

502

I(NERR)

Current in NERR

V(LDA) = V(VDD) = V(NERR),

no error state, V(MDL) < 0.5 V

0.1

1

mA

503

I(NSF)

Current at NSF Message

V(LDA) = V(VDD) = V(NSF), V(NSF) > 0.8 V

1.5

10

mA

504

I(SDIS)

Current at SDIS Message

V(LDA) = V(VDD) = V(SDIS), V(SDIS) > 0.8 V

1.0

10

mA

505

Vsat()

Saturation Voltage at NERR,

NSF, SDIS

Isat = 1 mA, NERR in error state

600

mV

Current Monitor RSI, LDA

601

V(RSI)

Controlled Voltage at RSI

EN = hi

430

490

560

mV

602

RSI

Resistor at RSI

0.78

9

kΩ

603

VLDA

LDAOK Monitor Threshold

VDD – V(LDA)

440

490

550

mV

604

Idc(LDA)

Current from LDA

DC

320

mA

605

Rpd(LDA)

Pull-Down Resistor at LDA

Reset

1

kΩ

606

td(SDIS)

Overcurrent Shutdown Delay

I(LDA) > I(RSI) * 500

10

µs

607

rILDA

Current Ratio I(LDA)max / I(RSI)

780 Ω < RSI < 9000 Ω

400

500

650

608

Ipd(RSI)

Pull-Down Current in RSI

V(RSI) > 0.5 V

1

10

µA

Timing

701

ten

Propagation Time: EN lo → hi

system enable

no error at self test, CLDA = 1 µF

300

µs

702

tr

Laser Current Rise Time

see Fig. 2

1.5

ns

703

tf

Laser Current Fall Time

see Fig. 2

1.5

ns

704

tplh

Propagation Time:

LENx lo → hi to Current lo → hi

see Fig. 3

10

ns

705

tphl

Propagation Time:

LENx hi → lo to Current hi → lo

see Fig. 3

10

ns

706

ts0

Propagation Time:

V(SMD) > VSL to SMD(0) lo → hi

see Fig. 4

Tj = 27 °C

220

ns

Tj = 85 °C

240

ns

707

Propagation Time:

V(SMD) < VSL to SMD(0) hi → lo

220

ns

708

ts1

Propagation Time:

V(SMD) > VSH to SMD(1) lo → hi

see Fig. 4

220

ns

709

toff

Propagation Time:

SMD(1) lo → hi until shutdown

see Fig. 4

10

ns

710

td

Propagation Time:

SMD(1) lo → hi until error

message

see Fig. 4

500

ns