Laser Diode Driver with TEC Controller
Laser diode driver features
- Constant current mode
- Low current ripple ≤ 10uA
- Current stability 0.1%
- No need to adjust voltage
- Soft-start
- Adjustable current limit
- Reverse current protection
- Crowbar circuit protection
- Own software
TEC controller features
- Temperature stabilization range +15°C to +40°C
- Low current ripple≤2mA
- Integrated PID controller, doesn't require setup
- Adjustable TEC output current limit
- Working with sensor NTC 10kOhm
- Additional NTC thermistor input
Applications
- Supplying laser diodes
Controls
- Potentiometers on the board
- External input
- Digital control by RS-232/UART/USB1
Description
SF8xxx contains a laser diode driver and a temperature controller (TEC).
Laser diode driver is a non isolated low drop out (LDO) regulator with constant current output. Driver produces high stability and low ripple current.
TEC is a non isolated DC/DC. TEC produces low current ripples. Additional features include an adjustable TEC output current limit and Integrated self-adjusted PID controller, providing optimal temperature regulation.
SF8xxx can be controlled by analogue or digital signals and switches on the board.
SF8xxx is housed in 61 × 58 mm package with aluminum base plate to aid thermal dissipation. Driver can be mounted on any thermal conductive surface enough to dissipate driver losses.
Electrical characteristics
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT LDD
Output voltage
0.5
4
V
Output current
SF8025
0
250
mA
SF8075
0
750
SF8150
0
1500
Current ripple
10
15
uA
Pulse rate
Set by RS-232 or UART
0.1
100
Hz
Pulse duration
Set by RS-232 or UART
1
5000
ms
Rise time (Soft-start time)
SF8025
1.2
1.4
1.5
ms
SF8075
1.8
2.2
2.5
ms
SF8150
2.6
3.0
3.3
ms
Fall-time (Stop time)
SF8025
1.4
1.5
1.7
ms
SF8075
0.6
0.7
1.2
ms
SF8150
0.4
0.5
0.6
ms
Error-triggered fall-time (Stop time)
SF8025
1.4
1.5
1.7
ms
SF8075
0.6
0.8
1.1
ms
SF8150
0.4
0.5
0.6
ms
OUTPUT TEC
Output voltage
0
±4
V
Output current
0
±4
A
Current ripple
2
4
mA
Temperature change range
+15
+40
°C
CONTROLS
Enable pins low threshold
1
V
Enable pins high threshold
2.3
V
Interlock pin threshold
1
V
Interlock pin pull-up resistance
10
kΩ
LDD current set pin voltage vs. output current
SF8025
100
mA/V
SF8075
300
SF8150
600
LDD current set step
Set by RS-232 or UART
0.5
mA
LDD current set accuracy
1
%
LDD current set calibration
-5
+5
%
TEC temperature set step
Set by RS-232 or UART
0.01
°C
TEC temperature set accuracy
1
%
TEC temperature set calibration
-5
+5
%
AUX SUPPLY
2.5V accuracy
0.2
%
2.5V output current
10
mA
INTERNAL MEASURMENTS
Internal measurements accuracy
2
%
LDD current monitor pin voltage vs. output current
SF8025
100
mA/V
SF8075
300
SF8150
600
External sensor temperature
NTC 10k
-10
150
°C
INPUT
Vin quiescent current
7
10
20
mA
Operating current
7
A
Typical Performance Characteristics
Mechanical dimensions
描述 [描述] Maximum current LD (I): 750 mA;<br />Output voltage LD (V): 0.5-3 V