WKSO8 | DigiCamel IC Datasheet

Online Datasheet

Read WKSO8 online.

WKSO8 ICHAUS | Alldatasheet

Document overview

Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 8

Technical content

iC-WK, iC-WKL

2.4 V CW LASER DIODE DRIVER

Rev D1, Page 1/8

FEATURES

♦ CW operation up to 90 mA from 2.4 to 6 V supply voltage ♦ Rapid soft start after power-on typical within 70 µs ♦ 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 µA to 2.5 mA ♦ iC-WK with additional spike detection at monitor input MDA

APPLICATIONS

♦ Battery-powered LD modules ♦ LD Pointers ♦ Laser levels ♦ Bar-code readers PACKAGES SO8 MSOP8 BLOCK DIAGRAM MD LDMD LD MD 0.5 V VREF ..47 nF.. OVERTEMP. TRANSIENT iC−WKL OVERCURRENT/ LD ..100 nF.. CI R ..1 uF.. CLDA LD AGND CVCC suitable laser diode configurations: N, P, M MD LDK MDK CI MDA NQ LDA GND GND VCC+2.4..+6 V 1 3 RM PROTECTION D FEEDBACK MON. 200..50 k W 47 pF CM iC−WK Copyright © 2006 iC-Haus http://www.ichaus.com

iC-WK, iC-WKL Rev D1, Page 2/8

DESCRIPTION

The iC-WK/L device is a driver for laser diodes in con- tinuous wave operation which requires only four ex- ternal components. The wide power supply range of 2.4 to 6 V and the integrated reverse battery protec- tion 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 over- current 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 sup- ply voltage (range: 10 µA 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 modula- tion 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 dis- turbance. 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) GND MDK AGND MDA LDA WKCI VCC LDK code... ... PIN CONFIGURATION MSOP8 (top view) GND CI AGND MDK LDK LDA VCC MDA iC−WK Code PIN FUNCTIONS No. Name Function

1 GND Ground

2 CI Capacitance for Power Control

3 AGND Reference Ground for CI, RM

4 MDK Monitor Input 2

(MD Cathode, Modulation)

5 MDA APC Setup,

Monitor Input 1 (MD Anode) 6 VCC +2.4 to +6 V Supply Voltage

7 LDA Laser Supply (LD Anode)

8 LDK Driver Output (LD Cathode)

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, iC-WKL Rev D1, Page 3/8 ABSOLUTE MAXIMUM RATINGS No Destruction, correct function not guaranteed. Item Symbol Parameter Conditions Fig. Unit No. Min. Max. G001 VCC Voltage at VCC -6 6.5 V G002 I(VCC) Current in VCC -10 95 mA G003 I(CI) Current in CI -10 10 mA G004 I(LDA) Current in LDA -95 10 mA G005 I(LDK) Current in LDK -10 95 mA G006 I(MDA) Current in MDA -10 10 mA G007 I(MDK) Current in MDK -10 10 mA G008 I(AGND) Current in AGND -10 10 mA G009 I(GND) Current in GND -95 10 mA G010 Vd() ESD Susceptibility at all pins MIL-STD-833, method 3015, HBM 100 pF unloaded over 1.5 kΩ 2 kV G011 Tj Operting Junction Temperature -40 150 °C G012 Ts Storage Temperature Range -40 150 °C THERMAL DATA Operating Conditions: VCC = 2.4...6 V Item Symbol Parameter Conditions Fig. Unit No. Min. Typ. Max. T01 Ta Operating Ambient Temperature Range -40 85 °C T02 Rthja Thermal Resistance Chip/Ambient SMD assembly, no additional cooling areas

140 K/W

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 Rev D1, Page 4/8

ELECTRICAL CHARACTERISTICS

Item Symbol Parameter Conditions Tj Fig. Unit No. °C Min. Typ. Max. Total Device 001 VCC Permissible Supply Voltage 2.4 6 V

002 I(LDK)m Permissible Laser Drive Current

(closed control loop) Tj = -40...125 °C 5 70 mA Tj = -40...80 °C 5 90 mA 003 Idc(VCC) Supply Current without load pathclosed control loop, I(MDK) = 0 2.4 5.5 mA 004 Ioff(VCC) Supply Current on Reset 2.4 5 mA

005 Ir(VCC) Reverse Supply Current RM = 50 kΩ, VCC = -6 V -6 -3 mA

006 ton() Turn-on Delay VCC: 0 → 5 V to 95 % I(LDK), I(LDK) = I(LDK)m; CI = 47 nF 70 µs CI = 100 nF 150 µs

007 Vc()hi Clamp Voltage hi at

VCC, LDA, MDK I() = 10 mA, other pins open 6 9 V

008 Vc(LDK)hi Clamp Voltage hi at LDK V() < VCC + 1 V; I() = 10 mA,

009 Vc(MDA)hi Clamp Voltage hi at MDA I() = 10 mA, other pins open

iC-WK 1.1 4 V 010 Vc()hi Clamp Voltage hi at CI I() = 10 mA, other pins open 1.1 4 V

011 Vc()lo Clamp Voltage lo at VCC, LDA,

MDK, MDA, CI I() = -10 mA, other pins open -9 V Reference and Monitor Inputs MDA, MDK, AGND

101 V(MDA) Reference Voltage at MDA closed control loop,

V(LDK) > Vs(LDK) 480 500 520 mV 102 dV(MDA) Reference Voltage Temperature Drift at MDA see 101; 120 µV/°C

103 Ierr(MDA) Input Current in MDA closed control loop, I(MDK) = 0 -300 300 nA

104 dI(MDA) Input Current Temperature Drift in MDA see 103; -2 2 nA/°C 105 APCerr Control Error RM = 10 kΩ, Tj = 0...80 °C 0.3 % 106 dI(MD) Supply Voltage Suppression of monitor current V(VCC): 2.4→ 6 V, I(LDK) = 70 mA -1 1 %

107 Rgnd() Resistor AGND-GND 3 Ω

108 Vf(MDK) Voltage at MDK Vf() = V(LDA)− V(MDK);

I(MDK) = 1 µA...1 mA 0.46 2.1 V

110 TC() Current Ratio Temperature

Coefﬁcient I(MDA) / I(MDK) Laser Drive LDA, LDK

201 Vs(LDK) Saturation Voltage at LDK I(LDK) = 40 mA 300 mV

I(LDK) = 70 mA, Tj = -40...125 °C 400 mV I(LDK) = 90 mA, Tj = -40...80 °C 400 mV 202 dI(MD) Load Balancing Error I(LD) = 20 mA, I(LDK): 20 mA→ 70 mA -1 1 % 203 It(LDK) Overcurrent Threshold in LDKTj = -40...125 °C 70 130 300 mA Tj = -40...80 °C 90 300 mA 204 toff() Overcurrent Reset Delay lack of feedback: I(RM) = 0 to I(LDK) = It(LDK); I(LDK) = 20 mA, CI = 47 nF 85 µs I(LDK) = 20 mA, CI = 100 nF 170 µs I(LDK) = 60 mA, CI = 47 nF 60 µs I(LDK) = 60 mA, CI = 100 nF 130 µs 205 Vf() Diode Forward Voltage LDK-LDAI(LDK) < 70 mA 1.1 V 206 Rvcc() Transient Protection ResistorVCC vs. LDA 4 Ω

iC-WK, iC-WKL Rev D1, Page 5/8 Item Symbol Parameter Conditions Tj Fig. Unit No. °C Min. Typ. Max. 207 Vt(MDA) Shutdown Threshold at MDA iC-WK only 0.56 2 V Control Release Flip-Flop

401 VCCen Set Threshold for Enable

0.6 1.9 V

402 Toff Overtemperature Shutdown 125 150 °C

iC-WK, iC-WKL 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 di- rectly 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. 0 s 10 us 20 us 30 us 40 us 50 us t I(LDK) V(CI) 0 V V(MDA) −I(MDA) V(LDA) V(VCC) 5.0 V 0 V 0 uA 0.6V 200 uA 5.0 V 0 V 2.0 V 0 V 0 mA 60 mA Phase I Phase II Phase III 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 resis- tance. Phase II, the initialisation process, begins when cur- rent starts to ﬂow at LDK. This phase ends when the laser reaches its threshold current and the monitor cur- rent produced raises the potential at resistor RM. The transition to CW operation (phase III) is gradual and primarily inﬂuenced by the CI and RM compo- nents. 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- 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 in- stance iC-WK/L simultaneously discharges control ca- pacitor CI so that no excessive laser diode currents occur when the supply voltage rises again. 100 us 150 us 200 us 250 us 300 us I(LDK) 0 mA V(CI) 2.0 V 0 V V(MDA) 0 V −I(MDA) 0 uA V(LDA) V(VCC) 60 mA 0.6 V t 200 uA 5.0 V 0 V 5.0 V 0 V Phase IV Phase V 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 pre- set resistor RM fail, the device is shutdown in less than 250 µs, provided that the supply voltage applied is high enough. When modulating or switching the laser current via pin MDK (see Application Notes), excessive Voltage oc- curring at pin MDA also causes a shut down (iC-WK only).

iC-WK, iC-WKL 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) = mon- itor current at the desired operating point. RM should be combined from ﬁxed resistor (max. output power) and a trimmer (calibration). Further application notes oniC-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 Rev D1, Page 8/8

ORDERING INFORMATION

Type Package Order Designation iC-WK SO8 iC-WK SO8 MSOP8 iC-WK MSOP8 iC-WKL SO8 iC-WKL SO8 MSOP8 iC-WKL MSOP8 WK Module for P-/M-Type Laser iC-WK iCSY WK1D WKL Module for P-/M-Type Laser iC-WKL iCSY WK1D WK Module for N-Type Laser iC-WK iCSY WK2D WKL Module for N-Type Laser iC-WKL iCSY WK2D WK Evaluation Board iC-WK EVAL WK4D WKL Evaluation Board iC-WKL EVAL WK4D For information about prices, terms of delivery, other packaging options etc. please contact: iC-Haus GmbH Tel.: +49 (61 35) 92 92-0 Am Kuemmerling 18 Fax: +49 (61 35) 92 92-192 D-55294 Bodenheim Web: http://www.ichaus.com GERMANY E-Mail: sales@ichaus.com

Product Information

WKSO8 specifications and overview.

Summary

2.4 V CW LASER DIODE DRIVER

Description

2.4 V CW LASER DIODE DRIVER

Source title WKSO8 Datasheet(PDF) - IC-Haus GmbH

Related Parts

More parts from the same family.

Browse manufacturer