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WLD3343

PAGE 11

WLD3343-00400-O

Table 2

Current Limit Set Resistor R

LIM

 vs         

Normalized Maximum Output Current

Normalized 
Maximum 
Output 
Current

Type A/B Laser 
Diode Constant 
Current Limit Set 
Resistor R

LIM

 ( 

 )

Type C Laser Diode 
Constant Current 
Limit Set Resistor 
R

LIM 

 )

Type C Laser Diode 
Constant Power 
Limit Set Resistor 
R

LIM

 ( 

 )

Type A/B Laser 
Diode Constant 
Power Limit Set 
Resistor R

LIM

 ( 

 )

0.00 (0%)
0.04 (4%)
0.08 (8%)
0.12 (12%)
0.16 (16%)
0.20 (20%)
0.24 (24%)
0.28 (28%)
0.32 (32%)
0.36 (36%)
0.40 (40%)
0.44 (44%)
0.48 (48%)
0.52 (52%)
0.56 (56%)
0.60 (60%)
0.64 (64%)
0.68 (68%)
0.72 (72%)
0.76 (76%)
0.80 (80%)
0.84 (84%)
0.88 (88%)
0.92 (92%)
0.96 (96%)
1.00 (100%)

152
162
172
183
194
205
217
230
243
257
272
288
305
322
341
361
382
405
429
455
483
514
547
582
621
664

149
160
171
183
195
208
222
236
251
267
284
301
320
340
361
383
406
432
459
488
519
552
588
627
670
716

150
160
169
179
190
201
213
225
238
251
265
280
296
313
330
349
369
390
412
436
462
490
519
551
586
624

150
160
171
183
195
207
220
234
248
263
279
295
313
331
350
370
392
414
438
463
490
519
550
583
618
656

OPERATION

An online tool is available 

to determine values for external components:

http://www.teamwavelength.com/support/tools.asp

.

Summary of Contents for WLD3343

Page 1: ...idth Over Temperature Shutdown 14 Pin DIP PCB Mount Figure 1 Top View Pin Layout and Descriptions WLD3343 1 2 3 4 5 6 7 14 13 12 11 10 9 8 TOP VIEW SHD VSET IMON PMON MODE LIM GND VDD PD PD OUTA RS OU...

Page 2: ...OR OR Bandgap Voltage Reference See Eq 7 Constant Current See Eq 5 VSET Adjusting Limit Current See Table 2 and Eq 3 Adjusting Laser Diode Current Range See Table 1 or Eq 1 1 1 RPD IPD VPD VPD RPD 2k...

Page 3: ...5 V ILD 1 0 Amp 5 V ILD 2 0 Amps 5 V ILD 3 0 Amps 5 V ILD 100 mA 12 V ILD 1 0 Amp 12 V ILD 2 0 Amp 12 V ILD 3 0 Amp 12 V ILD Full Scale ILD Full Scale Constant Current Sine Wave Constant Power TAMBIEN...

Page 4: ...SUPPLY Voltage VDD Current VDD supply quiescent MONITOR ACCURACY Monitor Voltage versus Expected Output Current based on transfer function PD Monitor versus Actual Setpoint versus Actual Pin 2 TAMBIE...

Page 5: ...43 to regulate the laser diode s forward current CONSTANT POWER OPERATION A 0 1 F capacitor between Pin 5 MODE and Pin 6 LIM configures the WLD3343 to regulate the laser diode s output power A resisto...

Page 6: ...o Pin 7 GND CP Connect Pin 13 PD to Pin 7 GND TYPE C LASER DIODE OPERATION CC Connect Pin 12 PD and Pin 13 PD to Pin 7 GND CP Connect Pin 13 PD to the cathode of the photodiode Power supply input for...

Page 7: ...Vs VLoad and mark on the X axis Example 12 volts 5 volts 7 volts Point A 2 Determine the maximum current ILoad through the driver and mark on the Y axis 1 amp Point B 3 Draw a horizontal line through...

Page 8: ...e driver Vs VLoad and mark on the X axis Example 9 volts 6 volts 3 volts Point A 2 Determine the maximum current ILoad through the driver and mark on the Y axis 2 5 amps Point B 3 Draw a horizontal li...

Page 9: ...NSE Note Wavelength Electronics recommends a conservative power rating of 2 times normal maximum for RSENSE Equation 2 incorporates this recommendation Table 1 Laser Diode Current Sense Resistor RSENS...

Page 10: ...ode type and mode of operation divide the maximum laser diode current determined in Section 1 into the desired maximum operating current for the laser diode This result is the Normalized Maximum Outpu...

Page 11: ...2 0 36 36 0 40 40 0 44 44 0 48 48 0 52 52 0 56 56 0 60 60 0 64 64 0 68 68 0 72 72 0 76 76 0 80 80 0 84 84 0 88 88 0 92 92 0 96 96 1 00 100 152 162 172 183 194 205 217 230 243 257 272 288 305 322 341 3...

Page 12: ...diode resistor connections Figure 5 Connecting RPD Equation 4 Calculating RPD Table 3 Monitor Photodiode Sense Resistor RPD vs Maximum Photodiode Current IPDMAX 20 A 50 k 200 A 5 k 2 mA 500 20 mA 50 M...

Page 13: ...UTDOWN SWITCH SHD 14 1 VDD WLD3343 SHD TTL INPUT ENABLE DISABLE OR 6 DISABLING OUTPUT CURRENT The output current can be enabled and disabled as shown in Figure 6 using a SPST Single Pole Single Throw...

Page 14: ...00 mA 438 m 5 01 RSENSE Rev A B 500 m 5 1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 WLD3343 LASER DIODE DRIVER VDD RLIM 1 TIE GROUND CONNECTIONS DIRECTLY TO PIN 7 RSENSE ENABLE DISABLE IMON NC 1 k 1 1 1 LD PD...

Page 15: ...A 438 m 5 01 RSENSE Rev A B 500 m 5 1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 WLD3343 LASER DIODE DRIVER VDD RLIM 1 TIE GROUND CONNECTIONS DIRECTLY TO PIN 7 RSENSE ENABLE DISABLE IMON NC 1 k 1 1 1 LD PD LD P...

Page 16: ...Pin 3 IMON to the amount of forward current flowing through the laser diode 13 MEASURING MONITOR PHOTODIODE CURRENT IN CONSTANT CURRENT MODE Equation 8 provides a transfer function for converting the...

Page 17: ...hru 0 25 6 4 DIA KEEPOUT 4 Required 0 038 0 97 Dia Thru Hole 0 060 1 52 Dia Pad 14 Required 0 023 0 58 0 023 0 58 0 900 22 86 0 945 24 00 SQ 0 175 4 45 0 100 2 54 PCB FOOTPRINT Screw 4 40 PHPH x 75 w...

Page 18: ...tent allowed by that organization s calibration facilities and to the calibration facilities of other International Standards Organization members WARRANTY This Wavelength product is warranted against...

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