IC-HTP Datasheet, PDF (23/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
Rev B1, Page 23/51
COMBINING BOTH CHANNELS
iC-HTP can drive one laser diode up to 1500 mA with
both channels combined. Therefor register bit MERGE
must be set to 1. Disable channel register bits DISC1
and DISC2 must both be set to 0 and both enable chan-
nel pins EC1 and EC2 must be set hi.
MERGE
0
1
Addr. 0x1B; bit 6
R/W 0
Channel 1 and 2 operate independently
Power transistor from channel 2 usable in parallel
with channel 1, regulation made by channel 1
Table 47: Channel combination
Different current ranges can be configured using
CRNG1 and CRNG2. The resulting range is the addi-
tion of both configured ranges.
CRNG1(1:0)
Addr. 0x1E; bit 1:0
R/W 00
00
Output current range from 0 to 750 mA, RACC1 = 0,
k factor set to 750/750 = 1
01
Output current range from 0 to 100 mA, RACC1 = 0,
k factor set to 100/750,= 0.13
10
Output current range from 0 to 25 mA, RACC1 = 0, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 9 mA, RACC1 = 0, k
factor set to 9/750 = 0.012
00
Output current range from 0 to 90 mA, RACC1 = 1, k
factor set to 750/750 = 1
01
Output current range from 0 to 12 mA, RACC1 = 1, k
factor set to 100/750 = 0.13
10
Output current range from 0 to 3 mA, RACC1 = 1, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 1.1 mA, RACC1 = 1, k
factor set to 9/750 = 0.012
Table 48: Current range channel 1
In ACC mode, only RACC1 modifies the current range
and for both channels the same.
Current ranges in merge mode for ACC
RACC1 CRNG1 CRNG2 Current Range
0
00
00
1500 mA
0
00
01
850 mA
0
00
10
775 mA
0
00
11
759 mA
0
01
00
850 mA
...
...
...
...
1
00
00
180 mA
1
00
01
102 mA
1
00
10
93 mA
1
00
11
91.1 mA
1
01
00
102 mA
...
...
...
...
Table 50: Merge mode current ranges
When both channels are combined the control is done
by channel 1. APC and ACC can both be used with
both channels combined.
In ACC mode, the reference needs to be configured
according to the selected current range (if both CRNG1
and CRNG2 are the same, set to 50% of the equiva-
lent value for a single channel operation). This is not
required for APC.
CRNG2(1:0)
Addr. 0x1E; bit 5:4
R/W 00
00
Output current range from 0 to 750 mA, RACC2 = 0,
k factor set to 750/750 = 1
01
Output current range from 0 to 100 mA, RACC2 = 0,
k factor set to 100/750,= 0.13
10
Output current range from 0 to 25 mA, RACC2 = 0, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 9 mA, RACC2 = 0, k
factor set to 9/750 = 0.012
00
Output current range from 0 to 90 mA, RACC2 = 1, k
factor set to 750/750 = 1
01
Output current range from 0 to 12 mA, RACC2 = 1, k
factor set to 100/750 = 0.13
10
Output current range from 0 to 3 mA, RACC2 = 1, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 1.1 mA, RACC2 = 1, k
factor set to 9/750 = 0.012
Table 49: Current range channel 2
Both VBL1 and VBL2 must be connected to the same
voltage level. If voltages at VBL1 and VBL2 are dif-
ferent, PODOVBL1 bit in status register will be set
and laser will be shut down. In merge mode, the
PODOVBL2 bit is used to monitor both VBL1 and VBL2
voltages for power down. If any of the VBL1 or VBL2
are in power down, this bit will be set.
PDOVBL1
0
1
Addr. 0x01; bit 3
R
VBL1 power down not occurred since last read. If
MERGE = 1, VBL1 voltage level equals VBL2
voltage level
VBL1 power down event has occurred. If MERGE =
1, VBL1 voltage level not equals VBL2 voltage level.
Cleared on read
Table 51: VBL1 power down