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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) 30 Page - IC-Haus GmbH |
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IC-HT 数据表(HTML) 30 Page - IC-Haus GmbH |
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30 / 45 page  prel imin ary prel imin ary iC-HT DUAL CW LASER DIODE DRIVER Rev B1, Page 30/45 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 0 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) 0.1μF CHECK 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 MEMERR C3 L1 1μH C1 C2 + - 48μA + - N CVB CVDD GND VB 2.5V 3.3V VDD VB REF ADSNF1 OVC1 DISP1 EMC MDA1 MISO/SDA SCLK/SCL GND PS/SYNC VAUX PG VIN L1 EN FB PGND L2 VOUT 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 1μH L1 C1 C2 C3 48μA CVB CVDD N Figure 19: Extension of working voltage range In the figure 19 both the laser and the iC-HT are sup- plied by output voltage Vout from DC/DC converter. The register RDCO is set to 23, which forces 48 µA to be output to the voltage divider. A system voltage of 3.3 V is obtained at Vout. Efficiency enhancement If iC-HT and the laser diode are supplied with the same power supply, the efficiency of the driver can be poor, depending on the supplied voltage, the saturation volt- age and the laser diodes forward voltage. Power dis- sipation of the driver can be reduced if LDAx is fed through the DC/DC converter configured to deliver a lower voltage than the power supply as shown in fig- ure 20. |
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