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WLD3343

PAGE 13

WLD3343-00400-O

Figure 6

Disabling Output Current

VDD

WLD3343

ENABLE

DISABLE

SHUTDOWN
SWITCH

SHD

VDD

WLD3343

SHD

TTL INPUT

ENABLE

DISABLE

6. DISABLING OUTPUT CURRENT

The output current can be enabled and disabled
as shown in Figure 6 using a SPST (Single-Pole
Single-Throw) switch or a TTL signal.

NOTE:

Do not insert or remove the laser diode from the
WLD3343 circuit with power applied to the unit.

OPERATION

Содержание WLD3343

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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