WKMSO8-TP ICHAUS | Alldatasheet
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Technical content
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 1/9
FEATURES
♦ Optimised for M-type laser diodes (single supply, case grounded) ♦ CW operation up to 350 mA from a single supply of 3.6 to 15 V ♦ Rapid soft start after power-on ♦ Simple power adjustment via an external resistor ♦ 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 temperature and overcurrent (i.e. if the laser diode is damaged or the feedback current path fails) ♦ Two feedback inputs permit all current laser diode types to be used (M/P/N configurations) ♦ Modulation via the feedback inputs possible ♦ Wide monitor current range from 2.5 µA to 6.25 mA
APPLICATIONS
♦ Blue laser diodes ♦ Laser diode modules ♦ Laser diode pointers ♦ Laser levels ♦ Bar-code readers PACKAGES SO8tp thermal pad DFN10 4 mm x 4 mm BLOCK DIAGRAM Pin numbers given for SO8 package only. Copyright © 2006 iC-Haus http://www.ichaus.com
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 2/9
DESCRIPTION
iC-WKM is a driver for laser diodes in continuous wave operation with laser currents of up to 350 mA, which requires only four external components. The wide power supply range of up to 15 V allows for op- eration of blue laser diodes, e.g. by Nichia or Sanyo. The driver is optimised for M-type laser diodes and allows the operation from a single supply and the connection of the laser diode case (common cath- ode) with ground. The iC includes integrated circuitry protecting against destruction by ESD, excessive temperature and over- current 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 ex- ternal resistor at MDA. The monitor current acts as a reference and is regulated independent of the in- fluence of temperature and supply voltage (range: 2.5 µA 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 P-type laser diode configuration; alter- natively, 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 dis- turbance. iC-WKM offers additional protection by means of spike detection at pin MDA. Should spikes or oscilla- tion occur at pin MDA the power lockout is activated after a certain time-out.
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 3/9 PACKAGES SO8tp, DFN10 4 mm x 4 mm to JEDEC standard PIN CONFIGURATION SO8tp (top view) CI MDK AGND MDA VCC WKMGND VCCA LDA code... ... PIN FUNCTIONS No. Name Function
1 CI Capacitor for Power Control
2 GND Ground
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 VCCA Driver Supply
7 VCC +3.6 to 15 V Supply Voltage
8 LDA Driver Output (LD Anode)
The Thermal Padis 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) 4 7 ... ...yyww iC−WKM PIN FUNCTIONS No. Name Function (MD Cathode, modulation) 5 n.c.
6 MDA APC Setup, Monitor Input 1
(MD Anode)
7 VCCA Driver Supply
8 VCC +3.6 to 15 V Supply Voltage
9 LDA Driver Output (LD Anode)
10 n.c. The Thermal Padis 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!
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 4/9 ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Fig. Unit No. Min. Max. G001 VCC Voltage at VCC -6 16 V G002 I(VCC) Current in VCC -10 900 mA G003 I(CI) Current in CI -10 10 mA G004 I(LDA) Current in LDA -900 10 mA G005 I(VCCA) Current in VCCA -10 10 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 -10 900 mA G010 Vd() ESD Susceptibility at all pins MIL-STD-833, method 3015, HBM 100 pF discharged via 1.5 kΩ 2 kV G011 Tj Operating Junction Temperature -40 150 °C G012 Ts Storage Temperature Range -40 150 °C THERMAL DATA Operating Conditions: VCC = 3.6...15 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
170 K/W
T03 Rthja Thermal Resistance Chip/Ambient therm. pad soldered to approx. 2 cm² cooling area 30 50 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.
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 5/9
ELECTRICAL CHARACTERISTICS
Item Symbol Parameter Conditions Tj Fig. Unit No. °C Min. Typ. Max. Total Device 001 VCC Permissible Supply Voltage 3.6 15 V
002 I(LDA)m Permissible Laser Drive Currentcontrol range -350 -10 mA
003 Idc(VCC) Supply Current without load pathclosed control loop, I(MDK) = 0,
I(LDA) = 350 mA 5 10 mA 004 Ioff(VCC) Supply Current after Reset 2.4 5 mA
005 Ir(VCC) Reverse Supply Current RM = 50 kΩ, VCC = -6 V -10 -3 mA
006 ton() Turn-on Delay VCC: 0 → 5 V to 95%I(LDA); I(LDA) = I(LDA)m, CI = 3.3 µF 600 µs 007 Vc()hi Clamp Voltage hi at MDA I() = 10 mA, other pins open 1.1 4 V
008 Vc()lo Clamp Voltage lo at
VCC, LDA, MDA, CI, VCCA I() = -10 mA, other pins open -9 V
009 Vc()hi Clamp Voltage hi at MDK
I() = 10 mA, other pins open 6 11 V
010 Vc()lo Clamp Voltage lo at MDK
I() = -10 mA, other pins open -11 -1 V
011 Vc()hi Clamp Voltage hi at VCC, LDA,
CI, VCCA I() = 10 mA, other pins open 16 24 V Reference and Monitor Inputs MDA, MDK, AGND
101 V(MDA) Reference Voltage at MDA closed control loop,
V(LDA) < Vs(LDA) 230 250 270 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 -100 100 nA
104 dI(MDA) Input Current Temperature Drift in MDA see 103 -1 1 nA/°C
105 APCerr Control Error RM = 10 kΩ;
106 dI(MD) Supply Voltage Suppression V(VCC): 3.6 V→ 15 V, I(LDA) = -350 mA -4 4 %
107 Rgnd() Resistor AGND-GND 3 Ω
109 TC() Current Ratio Temperature
Coefficient I(MDA)/I(MDK)
110 TC() Current Ratio Temperature
Coefficient I(MDA)/I(MDK)
111 Vf(MDK) Voltage at MDK Vf() = V(VCCA)− V(MDK),
I(MDK) = 1 µA...6 mA 0.4 2 V Laser Driver LDA
201 Vs(LDA) Saturation
Voltage at LDA referenced to VCC Vs(LDA) = V(VCC)− V(LDA); I(LDA)= -40 mA 1.0 V I(LDA)= -350 mA 1.5 V 202 dI(MDA) Load Balancing Error I(LDA): -20→ -350 mA -5 4 %
203 It(LDA) Overcurrent Threshold in LDA -700 -360 mA
204 toff() Overcurrent Reset Delay lack of feedback: I(MD) = 0 to I(LDA) > -10 mA, VCC = 5 V, CI = 1 µF 600 µs
205 Vf() Flyback Diode Forward Voltage
V(GND)-V(LDA) I(LDA) > -350 mA 1.5 V
206 Rvcc() Transient Protection ResistorVCC to VCCA 3 Ω
207 Vt(MDA) Shutdown Threshold at MDA t > 1 µs 0.7 1.8 V
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 6/9 Item Symbol Parameter Conditions Tj Fig. Unit No. °C Min. Typ. Max. Control Release Flip-Flop
301 VCCen Set Threshold for Enable
0.6 1.9 V
302 Toff Overtemperature Shutdown 140 165 °C
M-TYPE CW LASER DIODE DRIVER Rev C1, Page 9/9
ORDERING INFORMATION
Type Package Order Designation iC-WKM SO8tp iC-WKM SO8 DFN10 4 mm x 4 mm iC-WKM DFN10 Evaluation Board iC-WKM EVAL WKM1D 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