IC-HTP datasheet(2/51 Pages) ICHAUS

2 / 51 page

prel

imin

ary

prel

imin

ary

iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 2/51

DESCRIPTION

Dual CW laser diode driver iC-HTP can operate two

individual laser diodes with up to 750 mA laser cur-

rent depending on the heat dissipation. Each channel

can be enabled independently. The laser diode driver

can be controlled by an external microcontroller (MCU

mode) or operate stand alone with pin/resistor config-

uration (iC-WK mode). In MCU mode, both channels

can be combined for driving up to 1500 mA.

Each channel can be operated individually either in

automatic current control (ACC) or automatic power

control (APC). All parameters including the internal

reference voltages are set via serial communication

(I2C or SPI). A 10 bit resolution D/A converter with

logarithmic characteristic is used for setting the oper-

ating point. This allows an operating point resolution

better than 1%.

In APC control, the monitor diode photocurrent is used

to track the optically emitted power of the laser diode.

The feedback for the laser diode driver is the voltage

of the photocurrent at a monitor resistor. An 8 bit inter-

nal programmable logarithmic monitor resistor (PLR)

or an external monitor resistor can be selected for

closing the control loop. The PLR ranges from 100 Ω

to 500 kΩ with a step width less than 5%.

In ACC control, the laser diode current can be set

directly. Current ranges are selectable.

iC-HTP allows disabling the laser channels when an

overcurrent threshold has been exceeded. The over-

current threshold of each channel has 2 ranges and is

programmable through an 8 bit linear D/A converter.

The temperature monitor measures the internal chip

temperature. iC-HTP disables the laser channels

when overtemperature is detected.

A variety of voltages can be measured with a 10 bit

A/D converter. The following voltages can be mea-

sured:

• V(LDAx)

• V(VBLx)

• V(VDD)

• V(VB)

• V(PLRx)

• V(MDKx)

• V(RACCx)

The DCO current output pin can control an external

DC/DC converter. Controlling the DC/DC output volt-

age can optimize the power dissipation of the whole

system e.g. to extend battery life or reduce total power

consumption.

iC-HTP in standby mode has a very low current con-

sumption (< 10 µA) and does retain its configuration.

The device features for safe operation:

• Configuration verification

• Tri-state configuration pins

• Write protection in operating mode

• Safe default/startup state

• Software parameter controllable channel disabling

• Hardware pin controllable channel ensabling

• Configuration timeout for access monitoring

IC-HTP 数据表(PDF) 2 Page - IC-Haus GmbH

IC-HTP 数据表(HTML) 2 Page - IC-Haus GmbH

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

数据表下载