Laser diode driver
Features
- Low current ripple
- No need to adjust voltage
- Soft-start
- Adjustable overcurrent limit
- Thermal warning and shutdown
- Reverse current protection
- Crowbar circuit protection
- Universal controls
- NTC thermistor input
- Own software
Applications
- Supplying laser diodes, bars and arrays
- Supplying high power LED arrays
Description
The SF6250 is a non isolated DC/DC SMPS (POL) with constant current output. Driver produces high stability and low ripple current. Protection features include an over current protection with adjustable limit, softstart, thermal warning and shutdown, reverse current protection and crowbar circuit protection. This means the SF6250 can safely drive non linear and current quality sensitive loads like laser diodes and LEDs. The driver can be controlled by analogue or digital signals. SF6250 is available in thermal enhanced quarter-brick 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
Output voltage (Vout)
1
0 67*Vin
V
Output current (Iout)
0
250
A
Current ripple
40
80
mA
Pulse rate
QCW-mode
0.1
100
Hz
Pulse duration
Set by RS-232 or UART
1
5000
ms
Set by analogue pin
0.5
1/F
Rise time (Soft-start time)
Iout = 250A
250
450
650
us
Iout = 125A
300
500
800
us
Fall-time (Stop time)
400
800
1200
us
Error-triggered fall-time (Stop time)
7
200
us
Output capacitance
3600
uF
INPUT
Vin quiescent current
Vin = 12V, no AUX load
100
130
150
mA
Input capacitance
370
uF
CONTROLS
Enable pin low threshold
1
V
Enable pin high threshold
2.3
V
Interlock pin threshold
1
V
Interlock pin pull-up resistance
10
kΩ
Current set pin voltage vs. output current
50
A/V
Current set step
Set by RS-232 or UART
0.1
A
Current set accuracy1
70A < Iout < 170A
+/- 5
%
170A < Iout < 250A
+/- 1
%
Current set calibration
- 5
+ 5
%
AUX SUPPLY
+/- 15V accuracy
+/- 2
%
+/- 15V output current
20
30
mA
5V accuracy
+/- 1.5
%
5V output current
200
300
mA
INTERNAL MEASURMENTS
Internal measurements accuracy
+/-2
%
Current monitor pin voltage vs. output current
50
A/V
Voltage monitor pin voltage vs. output voltage
1
V/V
External sensor temperature
NTC 10k
-10
150
°C
POWER DISSIPATION
Driver losses
Vin = 14V, Iout = 250A
80
100
120
W
PROTECTIONS
Crowbar clamp resistance
2.3
2.8
mΩ
Crowbar clamp response time
100
200
ns
Over-temperature warning
threshold temp
60
°C
Over-temperature warning
hysteresis
2
°C
Over-temperature shut down threshold temp
80
°C
Over-temperature shut down hysteresis
22
°C
Typical Performance Characteristics
Mechanical dimensions
描述 [描述] CW/QCW 250А 10V