IC-HT datasheet(36/45 Pages) ICHAUS

36 / 45 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev B1, Page 36/45

START-UP

Setting pin NSTBY to lo iC-HT enters standby mode.

In stand by mode and with no supply voltage at pin

VDD and the current consumption on VB is reduced to

less than 10 µA (cf. Electrical Characteristics No. 002).

After wake-up (pin NSTBY rising edge), the internal

regulated supply VDD is generated again.

The re-

quired time Tvdd depends on the capacitor connected

to the VDD pin (cf. Electrical Characteristics No. 504).

Once the VDD voltage level is correct, iC-HT enters an

offset compensation procedure regardless of the state

of the laser enable pins (EC1, EC2). During this time

(Ten), EC1 and EC2 are ignored and laser cannot be

switched on (cf. Electrical Characteristics No. 111). Af-

ter this time (Ten), laser channels can be switched on.

The switch-on procedure needs an initial time (Tci) to

reach the 80 % of the target light power (in APC mode)

or laser current (in ACC mode) (cf. Electrical Char-

acteristics No. 112) and an additional time (Tcio) to

reach the 99 % of the value (cf. Electrical Characteris-

tics No. 113 ). Figure 22 illustrates an startup example

for channel 1 in iC-WK mode.

NSTBY

VDDOK

EC1

I(LDK1)

VDD

Tci

Tcio

Ten

TVdd

Figure 22: Startup timing diagram

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