MAIMAN ELECTRONICS SF6040 User manual

v2.0.4 ‒ 2020
SF6040
Laser diode driver
Datasheet &
User Manual
Before powering on your driver, read this manual thoroughly.
If you have any doubt or suggestion, please do not hesitate to contact us!
Maiman Electronics
e-mail: [email protected]
web site: www.maimanelectronics.com

v2.0.4 ‒ 2020
v2.0.3:
Added paragraphs «Overall dimensions and weight» and «Functional schemes»
v2.0.4:
Paragraph «Warranty», error-triggered fall-time values (Paragraph «Electrical characteristics»),
examples of digital commands, and correction in paragraphs «how to get started»and «Digital control
description (extended)» was added.

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2
Table of content
1. Features ............................................................................................................................................... 3
2. Applications.......................................................................................................................................... 3
3. Description........................................................................................................................................... 3
4. Package set .......................................................................................................................................... 3
5. Overall dimensions and weight ........................................................................................................... 3
6. Absolute maximum ratings.................................................................................................................. 3
7. Recommended operating conditions .................................................................................................. 4
8. Power supply requirements................................................................................................................. 4
9. Electrical characteristics ...................................................................................................................... 4
10. Typical Performance Characteristics ................................................................................................... 6
11. Functional schemes ............................................................................................................................. 7
12. Pin and terminal functions................................................................................................................... 8
13. Analogue control description ............................................................................................................ 10
14. How to get started ............................................................................................................................. 11
15. Cooling ............................................................................................................................................... 11
16. Internal protections ........................................................................................................................... 11
17. Software.............................................................................................................................................11
18. Digital control description ................................................................................................................. 11
19. Digital control description (extended)............................................................................................... 16
20. Mechanical dimensions ..................................................................................................................... 19
21. Warranty ............................................................................................................................................19

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1. 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
2. Applications
Supplying laser diodes, bars and arrays
Supplying high power LED arrays
3. Description
The SF6040 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, soft-
start, thermal warning and shutdown,
reverse current protection and crowbar
circuit protection. This means the SF6040 can
safely drive nonlinear and current quality
sensitive loads like laser diodes and LEDs.
The driver can be controlled by analogue
or digital signals.
SF6040 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.
4. Package set
Driver –1 pcs
50 cm ribbon cable with one 8-pin connector –1 pcs
50 cm ribbon cable with one 14-pin connector –1 pcs
Datasheet & User Manual –1 pcs
5. Overall dimensions and weight
The driver has overall dimensions of 57.9 x 36.8 x 21 mm and a weight of 50 g.
6. Absolute maximum ratings*
MIN
MAX
UNIT
Vin+ to Vin-
-0.3
60
V
Operating temperature
-40
50
°C
Analogue control pins to GND
-0.3
5.5
V
RS-232 RXD to GND
-25
25
V
RS-232 TXD to GND
-13.2
13.2
V
UART RXD to GND
-0.3
5.5
V
UART TXD to GND
-0.3
5.5
V
*Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device.
These are stress ratings only, which do not imply functional operation of the device at these or any other
conditions beyond those indicated under recommended operating conditions. Exposure to absolute-maximum-
rated conditions for extended periods may affect device reliability.

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7. Recommended operating conditions
MIN
MAX
UNIT
Input voltage (Vin)
12
55
V
Operating temperature
-10
40
°C
Analogue control pins to GND
0
5
V
RS-232 RXD to GND
-12
12
V
RS-232 TXD to GND
-12
12
V
UART RXD to GND
0
5
V
UART TXD to GND
0
5
V
8. Power supply requirements
The driver requires a DC power supply with line regulation ± 1%. The power supply must be able to
cover the driver output power and losses. The power supply voltage must be at least 27% higher than
the voltage drop of your laser diode. Recommended power supply: Mean well SE-600-48.
ATTENTION! Do not use any relay between power supply and driver. When using a relay, voltage surges
may occur and driver may fail.
9. Electrical characteristics
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT
Output voltage (Vout)
5
0.73*Vin
V
Output current (Iout)
0
10
A
Current ripple
15
25
mA
Pulse rate (F)
QCW-mode
0.1
100
Hz
Pulse duration
Set by RS-232 or UART
2
1/F - 2
5000
ms
Set by analogue pin
0.5
1/F
Rise time (Soft-start time)
Iout = 10A
60
70
100
us
Iout = 5A
60
80
100
us
Fall-time (Stop time)
20
60
80
us
Error-triggered fall-time (Stop time)
15
45
us
Output capacitance
13.2
uF
INPUT
Vin quiescent current
Vin = 48V, no AUX load
10
20
30
mA
Input capacitance
17.6
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
2
A/V
Current set step
Set by RS-232 or UART
0.01
A
Current set accuracy
1A < Iout < 7A
+/- 5
%
7A < Iout < 10A
+/- 1
%
Current set calibration
- 5
+ 5
%

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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
2
A/V
Voltage monitor pin voltage vs.
output voltage
5
V/V
External sensor temperature
NTC 10k
-10
150
°C
POWER DISSIPATION
Driver losses
Vin = 55V, Iout = 10A
10
13
15
W
PROTECTIONS
Crowbar clamp resistance
7.4
9.4
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

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10. Typical Performance Characteristics
Figure 1 –Power dissipation vs. output current at full load
Figure 2 –Efficiency vs. output current at full load
2A/div
50us/div
Figure 3 –Typical start up sequence
Figure 4 –Typical stop sequence

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11. Functional schemes
Analogue interface
Figure 5 –Analog interface functional scheme
Power unit
Figure 6 –Power unit functional scheme

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12. Pin and terminal functions
Please, note polarity!
Never ground any lead of the output,
this may cause permanent damage to the laser diode and the driver!
Never use any grounded probes (e.g. from the oscilloscope) at the output!
Control pins are not isolated!
Terminals
Please, pay attention to the markings!
Terminal
Description
Vin+
Connect to the positive terminal of
the power supply.
Please, note polarity!
Vin-
Connect to the negative terminal of
the power supply.
Please, note polarity!
LD+
Connect to the laser diode anode.
Please note polarity!
Grounding this terminal may cause
permanent damage to the driver.
LD-
Connect to the laser diode cathode.
Please note polarity!
Grounding this terminal may cause
permanent damage to the laser
diode.
Controls
№
Description
1
Analogue control connector
2
Current limit adjustment
potentiometer (adjustment from
zero to maximum occurs in 12 turns)
3
Digital control connector

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Digital control connector
Wurth WR-MM 6901 5700 08 72 or TE Connectivity 215083-8
Pin
Description
1
UART RXD
2
RS-232 RXD
3
UART ТXD
4
RS-232 TXD
5
+5V auxiliary (duplicates pin 4 of analogue
control connector)
6
Interlock (duplicates pin 5 of analogue control
connector)
7
Crowbar status (duplicates pin 3 of analogue
control connector)
8
GND (connected to Vin- terminal)
Analogue control connector
Wurth WR-MM 6901 5700 14 72 or TE Connectivity 1-215083-4
PIN
I/O
Name
Description
1
I
Enable
High = operates; Low = stop.
Internally pulled down. TTL or CMOS signals only.
2
GND
Connected to Vin- terminal.
3
O
Crowbar status
High = fault; Low = normal operation.
Internally pulled down.
4
+5V
Auxiliary +5V power supply.
Up to 200mA output current capability.
5
I
Interlock
Open = locked; Low = operates.
Internally pulled up.
6
O
Over-temperature
warning
High = t°> 60°C; Low = t°< 58°C.
Internally pulled down.
7
GND
Connected to Vin- terminal.
8
-15V
Auxiliary -15V power supply.
Up to 20mA output current capability.
9
O
Voltage monitor
0-8V = 0-40V at the output.
10
+15V
Auxiliary +15V power supply.
Up to 20mA output current capability.
11
O
Current monitor
0-5V = 0-10А at the output.
12
GND
Connected to Vin- terminal.
13
I
Current set
0-5V = 0-10А at the output.
14
NTC Interlock
Connect NTC thermistor 10k between this pin and GND.