IC-HTP Datasheet, PDF (34/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
VB
2.5V
C3
2x10μF
C1
0.1μF
L1
1μH
L1
TPS63060
VIN
EN
VAUX
L2
VOUT
FB
PS/SYNC
GND
PG
PGND
6V
R1
100k
R3
1MEG
R2
6.7k
Rev B1, Page 34/51
48μA
C2
3x22μF
DUAL CW LASER DIODE DRIVER
DCO
CVB
1μF
CVDD
1μF
VB
VDD
VDD REGULATOR
- ^REF
+
RAM
INTEGRITY
CHECK
0x10 0x30
0x1F 0x3F
RAM
REGISTERS
0x13 REF1(9:8)
0x14 REF1(7:0)
10 Bit
D
A
+
-
CI
ECIE1
VBL1
CIH1
CI1
LDA1
VB UNDERVOLTAGE
VDD UNDERVOLTAGE
0x11 ILIM1(7:0)
8 Bit
D
A
OVC
VDD
ACC
P
MRH1
NCHK
CFGTIMO
Check
PODO
OVC
MEMERR
WATCHDOG
OVT
WATCHDOG
TIMER
OSCILLATOR
0x12 RMD1(7:0)
EM C
8 Bit
DISP1
R
0
255
APC
MDK1
EMC
NCS/A1
MOSI/A0
SCLK/SCL
MISO/SDA
IO DRIVERS
SPI/I2C
SLAVE
0x03
0x04
ADC1(9:8)
ADC1(7:0)
0x10 ADCC1(2:0)
10 Bit
A
D
LDA1
VBL1
VB
A DM DK 1
LASER CHANNEL 1 ^ADFNS1
x1
x2
Signal Level Converter
GND
INS/WKR
NSTBY
EC1
EC2
T.PAD
GND
TEMPERATURE
MONITOR 8 Bit
LASER
CONTROL
0x16 ILIM2(7:0)
0x18
0x19
REF2(9:8)
REF2(7:0)
0x05
0x06
ADC2(9:8)
ADC2(7:0)
0x17 RMD2(7:0)
0x02 TEMP(7:0)
10 Bit
A
D
LDA2
VBL2
VDD
ADM DK2
LASER CHANNEL 2
VBL2
CIH2
CI2
LDA2
MRH2
MDK2
Figure 20: Extension of working voltage range
In the figure 20 both the laser and the iC-HTP are sup-
plied by output voltage Vout from DC/DC converter. The
register RDCO is set to 23, which forces 48 µA to be
output to the voltage divider. A system voltage of 3.3 V
is obtained at Vout.
Efficiency enhancement
If iC-HTP and the laser diode are supplied with the
same power supply, the efficiency of the driver can be
improvable, depending on the supplied voltage, the sat-
uration voltage and the laser diodes forward voltage.
Power dissipation of the driver can be reduced if LDAx
is fed through the DC/DC converter configured to de-
liver a lower voltage than the power supply as shown in
figure 21.