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| iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 1/8 FEATURES o o o o o o o CW operation up to 90 mA from 2.4 to 6 V supply voltage Rapid soft start after power-on typical within 70 s Simple power adjustment via the external resistor Control loop accuracy better than 1% 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 10 A to 2.5 mA iC-WK with additional spike detection at monitor input MDA APPLICATIONS o o o o Battery-powered LD modules LD Pointers Laser levels Bar-code readers o o o o PACKAGES SO8 MSOP8 BLOCK DIAGRAM +2.4..+6 V 6 CVCC ..47 nF.. VCC LDA 7 CLDA ..1 uF.. TRANSIENT PROTECTION MDK 4 MD 5 LD - MDA iC-WKL 1 D + VREF 0.5 V CI LDK 2 8 NQ R CI RM 200..50 k CM 47 pF OVERCURRENT/ OVERTEMP. 1 GND GND iC-WK FEEDBACK MON. AGND 3 ..100 nF.. suitable laser diode configurations: N, P, M MD MD LD LD MD LD Copyright (c) 2006 iC-Haus http://www.ichaus.com iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 2/8 DESCRIPTION The iC-WK/L device is a driver for laser diodes in continuous wave operation which requires only four external components. The wide power supply range of 2.4 to 6 V and the integrated reverse battery protection allow for battery operation with a minimum of two cells. A reversed battery connection destroys neither the iC nor the laser diode. The iC includes integrated circuitry protecting against destruction by ESD, excessive temperature and overcurrent and a soft start which regulates the power and protects the laser diode when the power supply is switched on. The iC also filters the laser diode power supply for transients. The power supply is regulated and adapted to the laser diode used 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: 10 A to 2.5 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 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 continues 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-WK offers additional protection by means of spike detection at pin MDA. Should spikes or oscillation occur at pin MDA the power lockout is activated. PACKAGES SO8, MSOP8 to JEDEC PIN CONFIGURATION SO8 (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 to +6 V Supply Voltage Laser Supply (LD Anode) Driver Output (LD Cathode) PIN CONFIGURATION MSOP8 (top view) 1 GND CI AGND MDK LDK LDA VCC MDA code... ... WK Do not short-circuit pins AGND and GND, for this may deteriorate the precision of the regulator and interfere with the soft-start! iC-WK Code iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 3/8 ABSOLUTE MAXIMUM RATINGS No Destruction, correct function not guaranteed. Item No. 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 Operting Junction Temperature Storage Temperature Range MIL-STD-833, method 3015, HBM 100 pF unloaded over 1.5 k -40 -40 Conditions Fig. Min. -6 -10 -10 -95 -10 -10 -10 -10 -95 Max. 6.5 95 10 10 95 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(AGND) G009 I(GND) G010 Vd() G011 Tj G012 Ts THERMAL DATA Operating Conditions: VCC = 2.4...6 V Item No. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range Thermal Resistance Chip/Ambient SMD assembly, no additional cooling areas Conditions Fig. Min. -40 Typ. Max. 85 140 C K/W Unit All voltages are referenced to ground unless otherwise stated. All currents into the device pins are positive; all currents out of the device pins are negative. iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 4/8 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC = 2.4...6 V, RM = 200 ...50 k, Tj = -40...125 C unless otherwise noted Item No. 001 002 003 004 005 006 Symbol Parameter Conditions Tj C Fig. Min. 2.4 Tj = -40...125 C Tj = -40...80 C 5 5 2.4 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 iC-WKL iC-WK I() = 10 mA, other pins open I() = -10 mA, other pins open 6 6 -6 -3 Typ. Max. 6 70 90 5.5 5 V mA 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 (closed control loop) Supply Current on Reset Reverse Supply Current Turn-on Delay Supply Current without load path closed control loop, I(MDK) = 0 70 150 9 9 s s V V 007 008 009 Vc()hi Clamp Voltage hi at VCC, LDA, MDK Vc(LDK)hi Clamp Voltage hi at LDK Vc(MDA)hi Clamp Voltage hi at MDA 6 1.1 1.1 -9 9 4 4 V V V V 010 011 Vc()hi Vc()lo Clamp Voltage hi at 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(MD) Rgnd() Vf(MDK) CR() TC() closed control loop, V(LDK) > Vs(LDK) see 101; closed control loop, I(MDK) = 0 -300 -2 480 500 520 120 300 2 0.3 1 -1 1 3 Vf() = V(LDA) - V(MDK); I(MDK) = 1 A...1 mA I(MDK) = 10...500 A I(MDK) = 500 A...2.5 mA I(MDK) = 10...500 A I(MDK) = 500 A...2.5 mA I(LDK) = 40 mA I(LDK) = 70 mA, Tj = -40...125 C I(LDK) = 90 mA, Tj = -40...80 C I(LD) = 20 mA, I(LDK): 20 mA 70 mA Tj = -40...125 C Tj = -40...80 C lack of feedback: I(RM) = 0 to I(LDK) = It(LDK); I(LDK) = 20 mA, CI = 47 nF I(LDK) = 20 mA, CI = 100 nF I(LDK) = 60 mA, CI = 47 nF I(LDK) = 60 mA, CI = 100 nF VCC vs. LDA -1 70 90 130 0.46 0.975 0.95 -0.005 -0.025 2.1 1.025 1.05 0.005 0.025 300 400 400 1 300 300 %/C %/C mV mV mV % mA mA mV V/C nA nA/C % % % V Input Current Temperature Drift in see 103; MDA Control Error Supply Voltage Suppression of monitor current 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 6 V, I(LDK) = 70 mA Laser Drive LDA, LDK 201 Vs(LDK) Saturation Voltage at LDK 202 203 204 dI(MD) It(LDK) toff() Load Balancing Error Overcurrent Threshold in LDK Overcurrent Reset Delay 85 170 60 130 1.1 4 s s s s V 205 206 Vf() Rvcc() Diode Forward Voltage LDK-LDA I(LDK) < 70 mA Transient Protection Resistor iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 5/8 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC = 2.4...6 V, RM = 200 ...50 k, Tj = -40...125 C unless otherwise noted Item No. 207 401 402 Symbol Vt(MDA) VCCen Toff Parameter Shutdown Threshold at MDA Set Threshold for Enable Flip-Flop Overtemperature Shutdown Conditions iC-WK only Tj C Fig. Min. 0.56 0.6 125 Typ. Max. 2 1.9 150 V V C Unit Control Release Flip-Flop iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 6/8 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. TURN-ON/OFF BEHAVIOUR Turn-on behaviour After switching on the supply voltage the output stage remains disabled until the internal enabling flip-flop is set by a sufficiently high voltage at LDA. 5.0 V V(VCC) 0V 5.0 V V(LDA) 0V 200 uA -I(MDA) 0 uA 0.6V V(MDA) 0V 2.0 V V(CI) 0V 60 mA I(LDK) 0 mA 0s 10 us 20 us 30 us 40 us t 50 us Phase I Phase II Phase III out, thus the laser diode forward voltage is the prime factor determining the lowest possible supply voltage. If the voltage drops below this, the output stage is forcibly saturated and the laser current falls. In this instance iC-WK/L simultaneously discharges control capacitor CI so that no excessive laser diode currents occur when the supply voltage rises again. 5.0 V V(VCC) 0V 5.0 V V(LDA) 0V 200 uA 0 uA 0.6 V 0V 2.0 V 0V V(CI) V(MDA) Phase IV Phase V -I(MDA) Figure 1: Turn-on behaviour A quick soft start occurs during phase I; the control capacitor CI is loaded at an accelerated rate until the output stage supplies current at LDK. An open-circuit voltage at pin MDA is used to verify the external resistance. Phase II, the initialisation process, begins when current starts to flow at LDK. This phase ends when the laser reaches its threshold current and the monitor current produced raises the potential at resistor RM. The transition to CW operation (phase III) is gradual and primarily influenced by the CI and RM components. CI is properly dimensioned when the voltage overshot at MDA is at a minimum. Turn-off behaviour iC-WK/L functions without a fixed undervoltage lock- 60 mA I(LDK) 0 mA 100 us 150 us 200 us 250 us t 300 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 preset resistor RM fail, the device is shutdown in less than 250 s, provided that the supply voltage applied is high enough. When modulating or switching the laser current via pin MDK (see Application Notes), excessive Voltage occurring at pin MDA also causes a shut down (iC-WK only). iC-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 7/8 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 at the desired operating point. RM should be combined from fixed resistor (max. output power) and a trimmer (calibration). Further application notes on iC-WK/L and the data sheets of the evaluation modules and 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-WK, iC-WKL 2.4 V CW LASER DIODE DRIVER Rev D1, Page 8/8 ORDERING INFORMATION Type iC-WK iC-WKL Package SO8 MSOP8 SO8 MSOP8 Order Designation iC-WK SO8 iC-WK MSOP8 iC-WKL SO8 iC-WKL MSOP8 iC-WK iCSY WK1D iC-WKL iCSY WK1D iC-WK iCSY WK2D iC-WKL iCSY WK2D iC-WK EVAL WK4D iC-WKL EVAL WK4D WK Module for P-/M-Type Laser WKL Module for P-/M-Type Laser WK Module for N-Type Laser WKL Module for N-Type Laser WK Evaluation Board WKL Evaluation 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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