IC-HTP Datasheet, PDF (40/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
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).
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.
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
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.
TVdd
Ten
Tci
Tcio
NSTBY
VDD
VDDOK
EC1
I(LDA1)
Figure 23: Startup timing diagram