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IC-HT 数据表(PDF) 17 Page - IC-Haus GmbH |
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IC-HT 数据表(HTML) 17 Page - IC-Haus GmbH |
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17 / 45 page  prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 17/45 ACC (Automatic Current Control) mode In this mode, the laser diode current is controlled and no monitor diode is required. ACC mode is selected setting EACCx register bit to 1. EACC1 Addr. 0x10; bit 0 R/W 0 0 APC mode enabled for channel 1 1 ACC mode enabled for channel 1 Table 22: APC/ACC in channel 1 EACC2 Addr. 0x15; bit 0 R/W 0 0 APC mode enabled for channel 2 1 ACC mode enabled for channel 2 Table 23: APC/ACC in channel 2 In ACC mode the internal programmable logarithmic monitor resistor (PLR) is not used. Instead the inter- nal RACCx resistor is used to set the current. For fine-tuning the regulated current, the reference volt- age can be set with a 10 bit logarithmic D/A converter, which is configurable through the register REFx. This converter has a voltage range that goes typically from 0.1 V to 1.1 V, allowing an operation resolution of typi- cally 0.235%. More information on the logarithmic D/A converter can be found on page 26. Figure 8 shows an example of this configuration. Two different current ranges can be set through reg- ister bit RACCx, with RACCx = 1 for up to 75 mA and with RACCx = 0 for up to 650 mA. The programmable overcurrent shutdown protects against over regula- tions during the laser power-on. Table 44 shows some typical current settings. For detailed limits, please refer to Electrical Characteristics No. 114 ACC typical current settings REFx RACCx=0 RACCx=1 0x000 77.0 mA 9.06 mA 0x001 77.2 mA 9.08 mA 0x010 77.4 mA 9.10 mA ... ... ... 0x200 256.2 mA 30.14 mA 0x201 256.8 mA 30.21 mA 0x202 257.4 mA 30.28 mA ... ... ... 0x3FD 846.0 mA 99.53 mA 0x3FE 848.0 mA 99.77 mA 0x3FF 850.0 mA 100 mA Table 24: ACC typical current settings ACC APC RACC PLR1 ..10 nF.. 0 255 R 8 Bit LASER CHANNEL 1 10 Bit A D 8 Bit A D 10 Bit A D + - I LDK CI1 MRL1 MDA1 AGND1 CIL1 CI1 LDK1 DCO ECIE1 VB VDD LDK1 ADSNF1 OVC DISP1 EMC I LDK CI1 Figure 8: ACC mode simplified RACC1 Addr. 0x1A; bit 0 R/W 0 0 Current range high for channel 1 1 Current range low for channel 1 Table 25: RACC1 configuration RACC2 Addr. 0x1A; bit 4 R/W 0 0 Current range high for channel 2 1 Current range low for channel 2 Table 26: RACC2 configuration In each range, the particular overcurrent threshold value can be set in register ILIMx. The regulator does differ the two current ranges in ACC. ILIM1 Addr. 0x11; bit 7:0 R/W 0xFF 0x0A Channel 1 overcurrent threshold set to minimum current . . . Channel 1 overcurrent threshold set to Ilim = (∆I(LDK ) · n), n from 10 to 255 0xFF Channel 1 overcurrent threshold set to maximum current Table 27: Overcurrent threshold configuration channel 1 ILIM2 Addr. 0x16; bit 7:0 R/W 0xFF 0x0A Channel 2 overcurrent threshold set to minimum current . . . Channel 2 overcurrent threshold set to Ilim = (∆I(LDK ) · n), n from 10 to 255 0xFF Channel 2 overcurrent threshold set to maximum current Table 28: Overcurrent threshold configuration channel 2 An overcurrent event can be simulated using bit SOVCx. If SOVCx = 1, the corresponding overcurrent |
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