IC-HTG datasheet(2/40 Pages) ICHAUS

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iC-HTG

POWER CW LASER DIODE DRIVER

Rev A1, Page 2/40

DESCRIPTION

The CW power laser diode driver iC-HTG can oper-

ate an external laser or LED diode with an external

power transistor and has automatic current (ACC) and

power (APC) control functionality. All parameters, in-

cluding the internal reference voltages, are set via

serial communication (I2C or SPI). A 10-bit resolution

D/A converter with logarithmic characteristic is used

to set the operating point of the laser or LED. This

allows an operating point resolution better than 1%.

In APC mode, the monitor diode photocurrent is used

to track the optically emitted power of the laser diode.

The voltage present over a resistor through which the

photocurrent flows is used for feedback in the control

loop. An 8-bit internal programmable logarithmic mon-

itor resistor (PLR) or an external monitor resistor can

be selected to close the control loop. The PLR ranges

from 100 Ω to 500 kΩ with a step width of less than

5%. In ACC mode, the laser diode current can be

measured by means of a low impedance shunt resis-

tor. The output power can be analog modulated with

a frequency of up to 50 kHz. iC-HTG allows the laser

channel to be disabled when an overcurrent threshold

has been exceeded. The overcurrent threshold is pro-

grammable using an 8-bit linear D/A converter. The

temperature monitor measures the internal chip tem-

perature. iC-HTG disables the laser channel when

overtemperature is detected. A variety of voltages

can be measured with a 10-bit A/D converter. The

following voltages can be measured:

• V(VB)

• V(VBL)

• V(VDD)

• V(ANIN)

• V(MC)

• V(MDL)

• V(VRP)

• V(VRN)

The current output pin DCO can be used to adjust

an external DC/DC converter. Controlling the DC/DC

output voltage may optimize the power dissipation

of the whole system to extend battery life, for exam-

ple. In standby mode, iC-HTG has a very low current

consumption (typ. < 10 µA) while retaining its config-

uration. The device features for safe operation are:

• Configuration RAM content integrity monitored

• Tri-state configuration pins

• Write protection in operating mode

• Safe power-up state

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