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数据搜索系统，热门电子元器件搜索 |
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IC-HT 数据表(PDF) 16 Page - IC-Haus GmbH |
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IC-HT 数据表(HTML) 16 Page - IC-Haus GmbH |
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16 / 45 page  prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 16/45 Imon(min) = Vref (0x 000,max ) Rmda(RMDx =0xFF ,min) = 0.11 350000 = 0.31 uA It is not recommended to configure iC-HT to have such small Imon values, otherwise the leakage current at MDAx may have an influence (cf. Electrical Charac- teristics No. 204), especially at high temperatures. To avoid this, Imon should be much greater than the leak- age current. For calculating the maximum value of Imon, Vref(0x3FF, min value) (cf. Electrical Characteris- tics No. 303) and Rmda(RMDx = 0x00, max vaule) (cf. Electrical Characteristics No. 201) are used. The following formula can to be used for calculating Rmda(RMDx = 0x00, max value): Rmd = Rmd0(1 + ∆ Rmd (%) 100 )n+1, n from 0 to 255 Rmda(RMDx = 0x 00, max ) = Rmd0(1 + ∆ Rmd (%) 100 )16 286 = Rmd0(1 + 3.3 100 ) 16 Rmd0 = 170Ω Therefore: Imon(max ) = Vref (0x 3FF ,min) Rmd0 = 1.00 170 = 5.88 mA Any other Imon value can be calculated using Rmd for- mula above. Due to its logarithmic characteristic, the steps between two consecutive values is kept within 3.3 % typical value. The programmable overcurrent shutdown can be set to protect the laser by disabling the channel. The overcurrent threshold is configurable in two different ranges. The range is selected through register bit RACCx. If RACCx = 1, the overcurrent threshold is in the low range, up to 90 mA. If RACCx = 0, the overcur- rent threshold is in the high range, up to 750 mA (cf. Electrical Characteristics No. 107 ). RACC1 Addr. 0x1A; bit 0 R/W 0 0 Current range high for channel 1 1 Current range low for channel 1 Table 16: RACC1 current range configuration channel 1 RACC2 Addr. 0x1A; bit 4 R/W 0 0 Current range high for channel 2 1 Current range low for channel 2 Table 17: RACC2 current range configuration channel 2 In each range, the particular overcurrent threshold value can be set in register ILIMx. The regulator does not differ the two current ranges in APC. 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 18: 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 19: Overcurrent threshold configuration channel 2 An overcurrent event can be simulated using SOVCx. If SOVCx = 1, the corresponding overcurrent error bit OVCx will be set to 1, the error will be signaled at NCHK and the corresponding laser channel will be dis- abled. The overcurrent error will remain forced until SOVCx = 0. SOVC1 Addr. 0x1D; bit 5 R/W 0 0 No Overcurrent event at channel 1 is simulated. 1 Overcurrent event at channel 1 simulated. Table 20: Simulate overcurrent channel 1 SOVC2 Addr. 0x1D; bit 6 R/W 0 0 No overcurrent event at channel 2 is simulated. 1 Overcurrent event at channel 2 simulated. Table 21: Simulate overcurrent channel 2 |
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