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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AMC7820Y/2K 데이터시트(PDF) 18 Page - Texas Instruments |
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AMC7820Y/2K 데이터시트(HTML) 18 Page - Texas Instruments |
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18 / 29 page  AMC7820 SBAS231B www.ti.com 18 FIGURE 6. Soft Start Function. TEC Soft-Start Controller DAC0 (12 Bits) 6 7 48 47 1 46 2 SOFT_START_ENABLE SOFT_START_CTR SW4 SW2 SW3 OPA7_IN+ DAC0_OUT DAC0_OUT_SET OPA7_OUT SW2_OUT OPA7_IN– ON OFF Uni Bip R R EN OPA7 OPA9 T_SENSE_Voltage SW2_DISABLE Unipolar_Bipolar_CTR 2.5V To TEC DRIVER C R APPLICATION The AMC7820 can be used to control one CW type laser diode (or pump laser diode) current and one TEC cooler, two TEC coolers, or two laser diodes. See Figure 7 for a typical application to control one pump laser diode and one TEC. A similar approach can be used to control other CW type laser diodes. TEC CONTROL The TEC control loop is made up of the thermistor current source, a unity-gain buffer, a thermostat DAC (DAC0), the TEC integrator (OPA7), the internal TEC SOFT_START_ CONTROLLER, an external thermistor, and an external TEC Power Current Driver. The external thermistor is driven by the current from the thermistor current source. The voltage across the thermistor represents the actual TEC temperature, and is fed into the |
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