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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT8705 датащи(PDF) 12 Page - Linear Technology |
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LT8705 датащи(HTML) 12 Page - Linear Technology |
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12 / 24 page  LT3840 12 3840fa For more information www.linear.com/LT3840 operaTion and current limited. Figure 3 is a functional block diagram of the auxiliary bias supply. Auxiliary Bias Supply Start-Up and Shutdown The LT3840 auxiliary bias supply is enabled with the en- able (EN) pin. When the EN pin voltage exceeds a diode threshold the LT3840 comes out of the low quiescent cur- rent shutdown mode and turns on the internal reference (VREF) and internal bias (VREG). When the EN pin voltage exceeds its precision voltage threshold the auxiliary bias switching regulator is activated and the INTVCC voltage is regulated. Figure 4 is a functional block diagram of the auxiliary bias supply start-up. The auxiliary bias supply has its own enable pin to allow the INTVCC to be activated independent of the controller. INTVCC may be used to drive other circuitry in the applica- tion such as an LDO. Figure 3. Auxiliary Bias Supply Functional Block Diagram Figure 4. Auxiliary Bias Supply Start-Up Functional Block Diagram 3840 F04 INTERNAL REFERENCE OSCILLATOR LINEAR REGULATOR – + EN VREF VREF VIN AUXVIN INTVCC AUXILIARY BIAS SUPPLY VREG 3840 F03 VIN > 18V AUXBST CAUXBST LPWR INTVCC EXTERNAL COMPONENTS AUXSW1 AUXSW2 INTERNAL COMPENSATION R S Q AUXVIN VREF CINTVCC |
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