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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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900844 датащи(PDF) 64 Page - Freescale Semiconductor, Inc |
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900844 датащи(HTML) 64 Page - Freescale Semiconductor, Inc |
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64 / 118 page  Analog Integrated Circuit Device Data 64 Freescale Semiconductor 900844 FUNCTIONAL DEVICE OPERATION POWER SUPPLIES The output current is measured internally, digitized by the ADC, and stored in a register for the processor to access. The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected, the regulator will limit the current through cycle by cycle operation and alert the system through the V21FAULT signal, which will in turn assert the VRFAULT Interrupt signal. Figure 30. V21 Detailed Internal Block Diagram Main Features • Uses the VPWR rail as its power supply • It is used as a pre-regulator to many LDO rails, for enhanced efficiency and reduced thermal dissipation. • Uses Integrated MOSFETs •4.0 MHz switching frequency • High efficiency operating modes depending on load conditions • Output can be discharged through the low side switch. • Peak current sensing with over-current protection • Uses internal compensation • Gate drive circuits are supplied directly from VPWR Efficiency Curves Figure 31 efficiency curves are calculated under PWM mode, based on the recommended external component values and typical output voltage of 2.1 V. 3.0 V ≤ VPW ≤ 4.4 V. Driver Controller EA VREF Z1 Z2 Internal Compensation PVIN 21 SW21 FB21 ISENSE5 VPWR CO21 CIN 21 L21 SPI Interface PGND21 V21 CTLV21 AOACCTLV21 V21FAULT |
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