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iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 1/10 FEATURES o o o o o o o o Optimised for P-type laser diodes (case grounded) CW operation up to 350 mA from 3 to 15 V supply voltage Rapid soft start after power-on Simple power adjustment via an external resistor Control loop accuracy better than 2% with changes in temperature, supply voltage and load current Integrated reverse polarity protection for the iC and laser diode Strong suppression of transients with small external capacitors; integrated flyback path Permanent shutdown with excessive chip temperature and overcurrent (i.e. if the laser diode is damaged or the feedback current path fails) Second feedback input MDA also permits the operation of N-type laser diodes Modulation via the feedback inputs possible Wide monitor current range from 2.5 A to 6.25 mA APPLICATIONS o o o o o o Laser diode modules Laser diode pointers Pilot lasers Laser levels Barcode readers Distance measuring sensors
PACKAGES
o o o
SO8-TP (thermal pad)
DFN10 4 mm x 4 mm
BLOCK DIAGRAM
Pin numbers given for SO8 package only Copyright (c) 2010 iC-Haus http://www.ichaus.com
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 2/10 DESCRIPTION iC-WKP is a driver for laser diodes in continuous wave (CW) operation with laser currents of up to 350 mA from a wide power supply range of up to 15 V which requires only four external components. The driver is optimised for P-type laser diodes and allows the connection of the laser diode case to ground. The iC includes integrated circuitry protecting against destruction by ESD, excessive temperature and overcurrent plus a soft start of the regulator to protect the laser diode when the power supply is switched on. The iC also filters the laser diode power supply for transients. The regulator is adapted to the laser diode by an external resistor at MDK. The monitor current acts as a reference and is regulated independent of the influence of temperature and supply voltage (range: 2.5 A to 6.25 mA). The capacitor at CI determines the control time constants and start-up time. A second monitor input, pin MDA, allows the driver to be used for N-type laser diode configuration; alternatively, it can be used as an analogue modulation input (DC to a few kHz). In the event of failure, such as overcurrent in the laser path with a lack of feedback, for example, a quick power lockout is activated. The shutdown persists until power is reapplied, permitting a restart. The strain on power packs and batteries is relieved and the laser class is retained even in the event of a disturbance. iC-WKP offers additional protection by means of spike detection at pin MDK. Should spikes or oscillation occur at pin MDK the power lockout is activated after a certain time-out.
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 3/10 PACKAGES SO8tp, DFN10 4 mm x 4 mm to JEDEC standard PIN CONFIGURATION SO8tp PIN FUNCTIONS No. Name Function
8
1
CI
2 7
LDA VCC
GND
3
6
AGND
4
VCCA
5
MDK
MDA
Capacitor for Power Control Ground Reference Ground for CI APC Setup, Monitor Input 1 (MD Cathode) 5 MDA Monitor Input 2 (MD Anode, modulation) 6 VCCA Driver Supply 7 VCC +3 to +15 V Supply Voltage 8 LDA Driver Output (LD Anode)
1 2 3 4
CI GND AGND MDK
PIN CONFIGURATION DFN10 4 mm x 4 mm
code... ...
10 9 8
7
iC-WKP
... ...yyww
1 2 3 4 5
6
The Thermal Pad is to be connected to a Ground Plane on the PCB. Do not short-circuit pins AGND and GND as this may affect the precision of the regulator and interfere with the soft start!
WKP
PIN FUNCTIONS No. Name Function 1 2 3 4 CI GND AGND MDK Capacitor for Power Control Ground Reference Ground for CI APC Setup, Monitor Input 1 (MD Cathode)
Monitor Input 2 (MD Anode, modulation) 7 VCCA Driver Supply 8 VCC +3 to +15 V Supply Voltage 9 LDA Driver Output (LD Anode) 10 n.c.
5 n.c. 6 MDA
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 4/10 ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed. Item No. Symbol Parameter Voltage at VCC Current in VCC Current in CI Current in LDA Current in VCCA Current in MDA Current in MDK Current in AGND Current in GND ESD susceptibility at all pins Operating Junction Temperature Storage Temperature Range HBM, 100 pF discharged through 1.5 k -40 -40 Conditions Min. -6 -10 -10 -900 -10 -10 -10 -10 -10 Max. 16 900 10 10 10 10 10 10 900 2 150 150 V mA mA mA mA mA mA mA mA kV C C Unit
G001 VCC G002 I(VCC) G003 I(CI) G004 I(LDA) G005 I(VCCA) G006 I(MDA) G007 I(MDK) G008 I(AGND) G009 I(GND) G010 Vd() G011 Tj G012 Ts
THERMAL DATA
Operating Conditions: VCC = 3...15 V Item No. T01 T02 T03 Symbol Ta Rthja Rthja Parameter Operating Ambient Temperature Range Thermal Resistance Chip/Ambient Thermal Resistance Chip/Ambient SMD assembly, no additional cooling areas Therm. pad soldered to approx. 2 cm cooling area 30 Conditions Min. -40 Typ. Max. 85 170 50 C K/W K/W Unit
All voltages are referenced to ground unless otherwise stated. All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 5/10 ELECTRICAL CHARACTERISTICS
Operating Conditions: VCC = 3...15 V, RM = 0.2...500 k, Tj = -40...125 C unless otherwise stated Item No. 001 002 003 004 005 006 007 008 009 010 011 Symbol Parameter Conditions Min. VCC I(LDA)m Idc(VCC) Ioff(VCC) Ir(VCC) ton() Vc()hi Vc()lo Vc()hi Vc()lo Vc()hi Permissible Supply Voltage Permissible Laser Drive Current (closed control loop) Control range 3 -350 5 2.4 RM = 50 k, VCC = -6 V VCC: 0 5 V to 95% I(LDA), I(LDA) = I(LDA)m, CI = 3.3 F I() = 10 mA, other pins open I() = -10 mA, other pins open I() = 10 mA, other pins open I() = -10 mA, other pins open I() = 10 mA, other pins open 1 -9 8 -11 16 11 14 -1 24 -15 -3 600 4 Typ. Max. 15 -10 10 5 V mA mA mA mA s V V V V V Unit
Total Device
Supply Current without load path Closed control loop, I(MDK) = 0, I(LDA) = -350 mA Supply Current after Reset Reverse Supply Current Turn-on Delay Clamp Voltage hi at MDA Clamp Voltage lo at VCC, LDA, MDA, CI, VCCA Clamp Voltage hi at MDK referenced to VCCA Clamp Voltage lo at MDK referenced to VCCA Clamp Voltage hi at VCC, LDA, CI, VCCA
Reference and Monitor Inputs MDA, MDK, AGND 101 102 103 104 105 Vref(MDK) Reference Voltage at MDK dV(MDK) Ierr(MDK) dI(MDK) APCerr Reference Voltage Temperature Drift at MDA Input Current in MDK Vref(MDK) = VCCA - V(MDK), closed control loop, VCC - V(LDA) > Vs(LDA) See 101 Closed control loop, I(MDA) = 0 -300 -1 1.18 1.24 1.30 120 300 1 V V/C nA nA/C
Input Current Temperature Drift in See 103 MDK Control Error RM = 10 k; Tj = 0...80 C Tj = -40...125 C V(VCC): 3 15 V, I(LDA) = -350 mA I(MDA) = 1 A...1 mA I(MDA) = 1...6 mA I(MDA) = 1 A...1 mA I(MDA) = 1 A...6 mA Vs(LDA) = V(VCC) - V(LDA); I(LDA)= -40 mA I(LDA)= -350 mA I(LDA): -20 -350 mA Lack of feedback: I(MD) = 0 to I(LDA) > -10 mA, VCC = 5 V, CI = 3.3 F I(LDA) > -350 mA VCC to VCCA Vt(MDK) = V(VCCA) - V(MDK), t > 1 s
0.5 2 -2 0.98 0.95 -0.005 -0.025 0.4 1.3 2 3 1.02 1.05 0.005 0.025 2
% % %
106 107 108 109 110
dI(MD) Rgnd() CR() TC() Vf(MDA)
Supply Voltage Suppression Resistor AGND-GND Current Ratio I(MDA)/I(MDK) Current Ratio Temperature Coefficient I(MDA)/I(MDK) Voltage at MDA
%/C %/C V
Laser Driver LDA 201 Vs(LDA) Saturation Voltage at LDA referenced to VCC 202 203 204 205 206 207 401 402 dI(MDK) It(LDA) toff() Vf() Rvcc() Vt(MDK) VCCen Toff Load Balancing Error Overcurrent Threshold in LDA Overcurrent Reset Delay Flyback Diode Forward Voltage V(GND)-V(LDA) Transient Protection Resistor Shutdown Threshold at MDK Set Threshold for Enable FlipFlop Overtemperature Shutdown
0.9 1.3 -2.5 -700 2 -360 600 1.5 3 1.35 0.6 140 2.1 1.9 165
V V % mA s V V V C
Control Release Flip-Flop
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 6/10 SAFETY INSTRUCTIONS Laser light can damage the human eye and the eyes of animals! Do not look at any laser light directly or through any optical lens. When handling a laser diode, do not look directly at the light generated by it. Wear appropriate safety glasses to prevent light from entering the eye even by reflection.
FUNCTION DESCRIPTION Setting the output power The output power is simply set by RM = Vref(MDK) / I(MD), where Vref(MDK) = Item No. 101 and I(MD) = the monitor current of the laser diode at the desired operating point. RM should be combined from a fixed resistor (max. output power) and a trimmer (calibration). Turn-on behaviour After switching the supply voltage on, the output stage remains disabled until the internal enabling flip-flop is set by a sufficiently high voltage at VCC. A quick soft start follows; the transition to controlled CW operation is gradual and primarily determined by the values of CI and RM. CI is properly dimensioned when the voltage undershoot at MDK is at a minimum.
V(MDK) VCC VCC - 0.5V VCC - 1V VCC - 1.5V V(LDA) 1.5V 1.0V 500mV 0 V(CI) 2V 1V 0 I(LD) 200mA 100mA 0 0 50us 100us Time 150us 200us 250us
If the voltage drops below this value, the output stage is forcibly saturated and the laser current decreases. iC-WKP simultaneously discharges control capacitor CI so that no excessive laser diode currents occur when the supply voltage again rises.
V(MDK) VCC VCC - 0.5V VCC - 1V V(LDA) 1.5V 1.0V 500mV 0 V(CI) 2V 1V 0 I(LD) 200mA 100mA 0 1ms Time 1,01ms 1,02ms
Figure 2: Turn-off behaviour Disruptions in operation The power control is shut down with excessive driver temperature or when the laser current reaches the overcurrent shutdown threshold, for example when the feedback path is interrupted. If the monitor diode or bias resistor RM fail, the device is shut down in less than 600 s, provided that the supply voltage applied is high enough. When modulating the laser current via pin MDA, low voltage occurring at pin MDK may also cause a shutdown.
Figure 1: Turn-on behaviour Turn-off behaviour iC-WKP works without a fixed undervoltage lockout, thus the laser diode forward voltage is the prime factor determining the lowest possible supply voltage.
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 7/10 APPLICATION NOTES Laser diode types Two laser diode types can be operated by iC-WKP. The operation of N-type laser diodes it is also possible. Here, however, the current mirror at MDA introduces a certain error to the automatic power control (c.f. Electrical Characteristics Nos. 108-110); iC-WKN, which has been optimised for use with these diodes, may be a better choice. iC-WKP does not allow for the operation of M-Type laser diodes. For these laser diode types iC-WKM would be the best choice. Layout To prevent instability of the regulator an additional capacitor (ca. 100 pF) must be positioned directly at the iC's pin CI. Depending on the laser diode, capacitor CM with typ. 2 nF in parallel with RM may be required for stability. RL may be introduced to improve stability even further and additionally reduce the power dissipation of iC-WKP. Pin AGND acts solely as a ground reference for the power regulator (CI and RM) and should not be shortcircuited with GND externally. This could have a negative effect on the control behaviour and monitor functions. Cooling Laser diodes should be sufficiently cooled, particularly with the power-regulated operation of setups which use iC-WKP, for example. The power dissipation in the laser diode otherwise causes the diode to heat up and the level of efficiency to drop which the power control unit then compensates for by increasing the laser current. This in turn brings about a rise in power dissipation in the laser diode and thus also in temperature. In this instance the laser diode could be damaged (resulting in spottiness of the laser beam and an increase in operating current) or even destroyed before the overcurrent shutdown threshold in iC-WKP is reached.
Figure 3: Operation of a P-type laser diode As iC-WKP has been optimised for use with P-type laser diodes, it is with this type of diode that the best functionality is achieved. This type of setup also enables the laser diode package to be connected to GND.
Figure 4: Operation of an N-type laser diode
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 8/10 EVALUATION BOARD iC-WKP comes with an evaluation board for test purpose. Figures 5 and 6 show both the schematic and the component side of the evaluation board.
VCCA AGND EPAD MDK MDA
N
LDC MDA
LDA
2
LDA
R 500k PM
RM 1k
L
3
LDAMDC
C
P
D2
1
LDC
CM 2.2nF
D1
CLDA 100nF
RL
1
VCCA 6
MDK 4
LDA 8
CI 1
CI1 100pF
CI2 opt.
MDA 5
2
1
3
1.24V
AGND 3 GND 2 GND SUB
+
U1 iC-WKP
7 VCC
Figure 5: Schematic of the evaluation board
VCC
CVCC2 opt.
CVCC1 100nF
-
CI
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 9/10
Figure 6: Evaluation board (component side)
iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by email. Copying - even as an excerpt - is only permitted with iC-Haus' approval in writing and precise reference to source. iC-Haus does not warrant the accuracy, completeness or timeliness of the specification and does not assume liability for any errors or omissions in these materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of the product. iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in Hanover (Hannover-Messe). We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to.
iC-WKP
15 V CW P-TYPE LASER DIODE DRIVER
Rev A6, Page 10/10 ORDERING INFORMATION
Type iC-WKP
Package SO8-TP DFN10 4 mm x 4 mm
Order Designation iC-WKP SO8-TP iC-WKP DFN10 iC-WKP EVAL WKP1D
Evaluation Board
For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel.: +49 (61 35) 92 92-0 Fax: +49 (61 35) 92 92-192 Web: http://www.ichaus.com E-Mail: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners

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