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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP19035 датащи(PDF) 17 Page - Microchip Technology |
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MCP19035 датащи(HTML) 17 Page - Microchip Technology |
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17 / 44 page  2012 Microchip Technology Inc. DS22326A-page 17 MCP19035 4.11 Soft Start To control the output voltage during start-up, the MCP19035 uses a soft-start circuit that allows the output voltage of the system to monotonically increase. The soft start circuitry allows the output voltage to rise up to the desired regulation limit, typically within 2.6 ms. The soft start circuit is enabled each time the MCP19035 starts. This includes initial start-up, start-up from toggling the SHDN pin, start-up after thermal shutdown, or start-up after an overcurrent condition. FIGURE 4-3: Soft Start-up Diagram. 4.12 Pre-Bias Load Start-up A special start-up sequence will prevent any current to be sourced from the output in case of a pre-biased load. This is accomplished by monitoring the FB pin and internal reference voltages. If the positive input to the Error Amplifier (internal reference voltage) is greater than the feedback voltage (voltage present at FB pin), the controller will drive the low-side MOSFET (synchronous rectifier) with a reduced duty cycle. This sequence ensures a smooth output voltage transition without sinking any current from the pre-biased external load. SHDN VOUT Soft Start Time (TSS = 2.6 ms) |
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