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| IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 1/9 FEATURES o o o o o o o o CW operation up to 300 mA from 2.4 to 15 V supply voltage Rapid soft start after power-on typical within 70 s Optimised for N-type laser diodes Simple output power adjustment via an external resistor (APC) Power control loop accuracy better than 1.5 % with changes in temperature, supply voltage and load current Integrated reverse polarity protection for the iC and laser diode Strong suppression of transients with very small external capacitors; integrated flyback path Permanent shutdown with excessive temperature and overcurrent (i.e. if the laser diode is damaged or the feedback current path fails) Two feedback inputs permit all current LD types to be used (N/P/M configurations) Modulation via the feedback inputs is possible Wide monitor current range from 2.5 A to 6.25 mA Pin compatible to iC-WK and iC-WKL (SO8 package) APPLICATIONS o Blue laser diodes o LD modules PACKAGES o o o o SO8tp DFN10 4 mm x 4 mm (on request) BLOCK DIAGRAM +2.4..+15 V 6 CVCC ..47 nF.. VCC LDA 7 CLDA ..1 uF.. TRANSIENT PROTECTION MDK 4 MD 5 LD - MDA IC-WKN 1 D + VREF 0.5 V CI LDK 2 8 NQ R CI RM 0.08..200 k CM 47 pF OVERCURRENT OVERTEMP. 1 GND GND FEEDBACK MON. AGND 3 ..100 nF.. suitable laser diode configurations: N, P, M MD MD LD LD MD LD Copyright (c) 2004 iC-Haus http://www.ichaus.com IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 2/9 DESCRIPTION IC-WKN is a driver for laser diodes in continuous wave operation with laser currents of up to 300 mA, which requires only four external components. The wide power supply range of up to 15 V allows for operation of blue laser diodes. 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 MDA. 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 MDK, allows the driver to be used for other types of laser diode configuration; alternatively, it can be used as an analog modulation input (DC to a few kHz). In the event of failure, such as overcurrent in the laser path due to 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-WKN offers additional protection by means of spike detection at pin MDA. Should spikes or oscillation occur at pin MDA the power lockout is activated after a certain time-out. IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 3/9 PACKAGES SO8tp, DFN10 4 mm x 4 mm to JEDEC standard PIN CONFIGURATION SO8tp (top view) 1 8 PIN FUNCTIONS No. Name Function LDK GND 2 7 CI LDA 1 2 3 4 GND CI AGND MDK 3 6 AGND 4 VCC 5 5 MDA 6 VCC 7 LDA 8 LDK MDK MDA Ground Capacitance for Power Control Reference Ground for CI, RM Monitor Input 2 (MD Cathode, modulation) APC Setup, Monitor Input 1 (MD Anode) +2.4...+15 V Supply Voltage Laser Supply (LD Anode) Driver Output (LD Cathode) The Thermal Pad is to be connected to a Ground Plane on the PCB. Do not short-circuit pins AGND and GND, for this may deteriorate the precision of the regulator and interfere with the soft-start! PIN CONFIGURATION DFN10 4 mm x 4 mm (top view) 10 9 8 7 6 IC-WKN ... ...yyww 1 2 3 4 5 The Thermal Pad is to be connected to a Ground Plane on the PCB. Do not short-circuit pins AGND and GND, for this may deteriorate the precision of the regulator and interfere with the soft-start! code... ... WKN PIN FUNCTIONS No. Name Function 1 2 3 4 GND CI AGND MDK Ground Capacitance for Power Control Reference Ground for CI, RM Monitor Input 2 (MD Cathode, modulation) APC Setup, Monitor Input 1 (MD Anode) +2.4...+15 V Supply Voltage Laser Supply (LD Anode) Driver Output (LD Cathode) 5 n.c. 6 MDA 7 8 9 10 n.c. VCC LDA LDK IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 4/9 ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. ItemNo. Symbol Parameter Voltage at VCC Current in VCC Current in CI Current in LDA Current in LDK Current in MDA Current in MDK Current in AGND Current in GND ESD Susceptibility at all pins Operating Junction Temperature Storage Temperature Range MIL-STD-883, Method 3015, HBM 100 pF discharged through 1.5 k -40 -40 Conditions Fig. Min. -6 -10 -10 -900 -10 -10 -10 -10 -900 Max. 16 900 10 10 900 10 10 10 10 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(LDK) G006 I(MDA) G007 I(MDK) G008 I(AGMD) G009 I(GND) G010 Vd() G011 Tj G012 Tj THERMAL DATA Operating Conditions: VCC = 2.4...15 V ItemNo. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range Thermal Resistance Chip/Ambient soldered to PCB; no additional cooling areas therm. pad soldered to approx. 2 cm cooling area Conditions Fig. Min. -40 Typ. Max. 85 170 50 C k/W k/W Unit 30 All voltages are referenced to ground unless otherwise noted. All currents into the device pins are positive; all currents out of the device pins are negative. IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 5/9 ELECTRICAL CHARACTERISTIC Operating Conditions: VCC = 2.4...15 V, RM = 80 ...200 k, Tj = -40...125 C unless otherwise noted ItemNo. 001 002 003 004 005 006 Symbol Parameter Conditions Tj C Fig. Min. 2.4 power control range 10 10 2.4 RM = 50 k, VCC = -6 V VCC: 0 5 V to 95 % I(LDK), I(LDK) = I(LDK)m; CI = 47 nF CI = 100 nF I()= 10 mA, other pins open V() < VCC + 1 V; I() = 10 mA, other pins open I() = 10 mA, other pins open I() = -10 mA, other pins open 16 16 8 1.1 -9 -6 -3 Typ. Max. 15 300 20 5 V mA mA mA mA Unit Total Device VCC I(LDK)m Idc(VCC) Ioff(VCC) Ir(VCC) ton() Permissible Supply Voltage Permissible Laser Drive Current Supply Current without load path closed control loop, I(MDK) = 0, I(LDK) = 290 mA Supply Current on Reset Reverse Supply Current Turn-on Delay 70 150 24 24 11 4 s s V V V V V 007 008 009 010 011 Vc()hi Vc()hi Vc()hi Vc()hi Vc()lo Clamp Voltage hi at VCC, LDA Clamp Voltage hi at LDK Clamp Voltage hi at MDK vs. LDA I() = 10 mA, other pins open Clamp Voltage hi at MDA, CI Clamp Voltage lo at VCC, LDA, MDK, MDA, CI Reference Voltage at MDA Reference Voltage Temperature Drift at MDA Input Current in MDA Reference and Monitor Inputs MDA, MDK, AGND 101 102 103 104 105 106 107 108 109 110 V(MDA) dV(MDA) Ierr(MDA) dI(MDA) APCerr dI(RM) Rgnd() Vf(MDK) CR() TC() closed control loop, V(LDK) > Vs(LDK) see 101 closed control loop, I(MDK) = 0, I(LDK) = 10...290 mA -100 -1 480 500 520 120 100 1 0.3 1 -1.5 1.5 3 Vf() = V(LDA) - V(MDK), I(MDK) = 1 A...1 mA I(MDK) = 1 A...1 mA I(MDK) = 1..6 mA I(MDK) = 1 A...1 mA I(MDK) = 1...6 mA I(LDK) = 40 mA I(LDK) = 290 mA I(LD) = 20 mA, I(LDK): 20 mA 290 mA V(LDK) = 2...5.5 V -1.5 300 0.46 0.98 0.95 -0.005 -0.025 2 1.02 1.05 0.005 0.025 350 700 1.5 700 1.2 lack of feedback: I(MD) = 0 to I(LDK) = It(LDK); CI = 47 nF CI = 100 nF I(LDK) < 290 mA VCC to LDA t > 1 s 0.7 %/C %/C mV mV % mA A mV V/C nA nA/C % % % V Input Current Temperature Drift in see 103 MDA Control Error Supply Voltage Suppression Resistor AGND-GND Voltage at MDK Current Ratio I(MDA) / I(MDK) Current Ratio Temperature Coefficient I(MDA) / I(MDK) RM = 10 k, Tj = 0...80 C RM = 10 k, Tj = -40...125 C V(VCC): 2.4 15 V, I(LDK) = 290 mA Laser Driver LDA, LDK 201 Vs(LDK) Saturation Voltage at LDK 202 203 204 205 dI(LD) It(LDK) It(LDK)m toff() Load Balancing Error Overcurrent Threshold in LDK Maximum Overcurrent Threshold in LDK Overcurrent Reset Delay 85 170 1.3 1.3 2 s s V V 206 207 208 Vf() Rvcc() Vt(MDA) Flyback Diode Forward Voltage LDK-LDA Transient Protection Resistor Shutdown Threshold at MDA IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 6/9 ELECTRICAL CHARACTERISTIC Operating Conditions: VCC = 2.4...15 V, RM = 80 ...200 k, Tj = -40...125 C unless otherwise noted ItemNo. Symbol Parameter Conditions Tj C Fig. Min. 0.6 1.2 1.0 0.6 140 Typ. Max. 1.9 1.9 1.7 1.2 165 V V V V C Unit Control Release Flip-Flop 401 VCCen Set Threshold for Enable Flip-Flop -40 27 125 402 Toff Overtemperature Shutdown IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 7/9 SAFETY PRECAUTIONS 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 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 LDA. tor determining the lowest possible supply voltage. If the voltage drops below this value, the output driver is forcibly saturated and the laser current decreases. IC-WKN simultaneously discharges the control capacitor CI so that no excessive laser diode currents occur when the supply voltage rises again. 5V 4V 3V 2V 1V 0 V(VCC) 5V 4V 3V 2V 1V 0 V(LDA) 400 mV 300 mV 200 mV 100 mV V(MDA) 1V 500 mV 0 V(CI) 60 m 40 m 20 m 0 I(LDK) 0 10 us 20 us Phase I Phase II Phase III 5V 4V 3V 2V 1V 0 V(VCC) 5V 4V 3V 2V 1V 0 V(LDA) 400 mV 300 mV 200 mV 100 mV V(MDA) 1V 500 mV Phase IV Phase V Time 30 us 40 us 50 us 0 V(CI) 60 m Figure 1: Turn-on behaviour A quick soft-start follows during phase I; the control capacitor CI is charged at an accelerated rate until the voltage at pin MDA reaches 1/3 of its nominal value. With V (MDA) > 1/3V (MDA)nom phase II starts, the controlled start-up. The transition to CW operation (phase III) is gradual and primarily determined by the values of CI and RM. CI is properly dimensioned when the voltage overshoot at MDA is at a minimum. Turn-off behaviour IC-WKN works without a fixed undervoltage lockout, thus the laser diode forward voltage is the prime fac- 40 m 20 m 0 I(LDK) 100 us 110 us 120 us Time 130 us 140 us 150 us 160 us 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 is interrupted. If the monitor diode or the bias resistor RM fail, the device is shut down in less than 250 s, provided that the supply voltage applied is high enough. When modulating the laser current via pin MDK, excessive voltage occurring at pin MDA also may cause a shutdown. IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 8/9 APPLICATION NOTES Setting the output power The output power is simply set by RM = V(MDA) / I(MD); with V(MDA) = Item-No. 101 and I(MD) = 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). Further application notes on the iC-WK family (iC-WK, iC-WKL, IC-WKN) and the data sheet of the demo board are available as separate documents. This specification is for a newly developed product. iC-Haus therefore reserves the right to change or update, without notice, any information contained herein, design and specification; and to discontinue or limit production or distribution of any product versions. Please contact iC-Haus to ascertain the current data. 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 on this site and does not assume liability for any errors or omissions in the 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. IC-WKN 15 V CW LASER DIODE DRIVER Rev B1, Page 9/9 ORDERING INFORMATION Type IC-WKN Package SO8tp DFN10 4 mm x 4 mm Order Designation IC-WKN SO8 IC-WKN DFN10 WKN4D DEMO Demo Board For information about prices, terms of delivery, other packaging options etc. 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 |
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