IC-HTP datasheet(40/51 Pages) ICHAUS

40 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 40/51

START-UP AND STANDBY

Setting pin NSTBY to lo iC-HTP enters standby. In

standby 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 required

time TVdd depends on the capacitor connected to the

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

Once the VDD voltage level is correct, iC-HTP 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).

After 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 Character-

istics No. 112) and an additional time (Tcio) to reach the

99 % of the value (cf. Electrical Characteristics No. 113

). Figure 23 illustrates an startup example for channel

1 in iC-WK mode.

NSTBY

VDDOK

EC1

I(LDA1)

VDD

Tci

Tcio

Ten

TVdd

Figure 23: Startup timing diagram

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