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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IC-HTP датащи(PDF) 33 Page - IC-Haus GmbH |
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IC-HTP датащи(HTML) 33 Page - IC-Haus GmbH |
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33 / 51 page  prel imin ary prel imin ary iC-HTP DUAL CW P-TYPE LASER DIODE DRIVER Rev B1, Page 33/51 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 control 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 battery, 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 19 shows this application: ADC1(7:0) 0x02 LASER CHANNEL 1 OVC 8 Bit A D ADMDK1 0x12 RMD1(7:0) VDD REGULATOR TPS63060 2x10μF 0.1μF R1 R3 R2 100k 6.7k 1MEG ADCC1(2:0) DUAL CW LASER DIODE DRIVER 0x14 CFGTIMO WATCHDOG WATCHDOG TIMER OSCILLATOR LASER 0x06 TEMP(7:0) 3x22μF MONITOR 8 Bit RAM 0x03 ADC1(9:8) TEMPERATURE 0x10 D A APC 8 Bit R x1 x2 0x16 LASER CHANNEL 2 0x17 RMD2(7:0) INTEGRITY OVT 0x04 0x05 ADC2(9:8) 0 VB UNDERVOLTAGE D A 255 ACC PODO 0x10 1μF 10 Bit VDD UNDERVOLTAGE 10 Bit SLAVE RAM ILIM2(7:0) CHECK 10 Bit A D 0x1F 0x30 0x3F 0x18 REF2(9:8) IO DRIVERS 0x11 0x13 REF1(7:0) REF1(9:8) 1μF ILIM1(7:0) CONTROL Signal Level Converter REF2(7:0) REGISTERS SPI/I2C ADC2(7:0) 0x19 MEMERR + - 20μA C2 P + - CVB CVDD C1 C3 1μH L1 6V 3V VB GND VB CI2 VBL2 CIH2 LDA2 MRH2 MDK2 VDD VDD VBL2 LDA2 ADMDK2 EMC DISP1 MDK1 MRH1 GND PS/SYNC VAUX PG VIN L1 EN FB PGND L2 VOUT CI1 CI ECIE1 DCO GND Check NCHK EC1 NSTBY INS/WKR MISO/SDA SCLK/SCL MOSI/A0 NCS/A1 EC2 EMC T.PAD VDD VB REF LDA1 OVC CIH1 VBL1 ADFNS1 LDA1 VBL1 20μA C2 P C3 C1 CVB CVDD L1 1μH Figure 19: 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-HTP must be supplied by a voltage within the thresh- old values of 2.8 V and 11 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 20: |
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