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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IC-HT датащи(PDF) 29 Page - IC-Haus GmbH |
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IC-HT датащи(HTML) 29 Page - IC-Haus GmbH |
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29 / 45 page  prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 29/45 The value in RDCO register needed in order to have the desired output voltage can be calculated using the following formula: RDCO = Idco 2uA = IR2−IR1 2uA = 0.5 6.7k − Vout−0.5 100k 2uA The resulting value will vary slightly depending on the tolerances of the selected resistors and DCO current. The voltage is reduced from 8 V (RDCO = 0) to 2.5 V, when RDCO = 27. DC/DC step up operation: regulation at voltages higher than power supply A practical application of the present case is the con- trol of blue lasers. This type of laser present a forward voltage around 5 V, which demands an LDA voltage of about 6 V. If the system is supplied with a 3 V LiPo bat- tery, it is necessary to use a the DC/DC in order to step up and drive the laser diode and driver with a sufficient voltage. Figure 18 shows this application: 0.1μF 3x22μF R1 R3 R2 100k 6.7k 1MEG 0x19 REF2(7:0) 0x17 RMD2(7:0) INTEGRITY OVT 0x04 ADC1(7:0) 0x10 0x1F 0x30 0x3F 0x16 LASER CHANNEL 2 VDD REGULATOR TEMPERATURE REF1(9:8) RMD1(7:0) 0x02 255 0 MEMERR 0x03 ADC1(9:8) 0x10 10 Bit D 8 Bit A IO DRIVERS A PLR1 D REGISTERS SPI/I2C TEMP(7:0) 0x11 ILIM1(7:0) 0x05 ADC2(9:8) 0x06 ADC2(7:0) LASER CHANNEL 1 D OVC 10 Bit APC ACC SLAVE RAM 2x10μF ILIM2(7:0) CHECK VB UNDERVOLTAGE VDD UNDERVOLTAGE RAM PODO 0x13 MONITOR 8 Bit A 8 Bit 0x18 REF2(9:8) R REF1(7:0) 0x12 1μF ADCC1(2:0) DUAL CW LASER DIODE DRIVER 0x14 CFGTIMO WATCHDOG WATCHDOG TIMER OSCILLATOR LASER CONTROL TPS63060 1μF + - N CVB CVDD + - 20μA C2 C3 1μH L1 C1 GND 3V VB VDD VB REF ADSNF1 OVC1 DISP1 EMC MDA1 MISO/SDA SCLK/SCL GND PS/SYNC VAUX PG VIN L1 EN FB PGND L2 VOUT 6V LDK1 CIL1 AGND1 LDK2 CI2 AGND2 MDA2 CIL2 MRL2 MRL1 CI1 CI ECIE1 DCO GND Check NCHK EC1 NSTBY INS/WKR MOSI/A0 NCS/A1 EC2 VDD VB LDK1 EMC T.PAD CVB CVDD N 20μA L1 1μH C1 C2 C3 Figure 18: Regulation at voltage greater than power supply Setting register RDCO to 10 it delivers 20 µA and 6 V are obtained at Vout. Extension of system working voltage range iC-HT must be supplied by a voltage within the thresh- old values of 2.8 V and 8 V. It is possible to control the DC/DC output in a voltage range of 2.5 V - 12 V if the DC/DC converter, controlled by DCO output signal, is included in the system, as it is shown in figure 19: |
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