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SM74301 Datasheet(PDF) 8 Page - Texas Instruments |
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SM74301 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page UVLO 7 V SW Pin Inductor Current Vin t 2 ILIM VCC VIN t1 t 3 IO 0V VOUT SM74301 SNVS719A – JULY 2011 www.ti.com Figure 10. Startup Sequence Regulation Comparator The feedback voltage at FB is compared to an internal 2.5V reference. In normal operation (the output voltage is regulated), an on-time period is initiated when the voltage at FB falls below 2.5V. The buck switch will stay on for the on-time, causing the FB voltage to rise above 2.5V. After the on-time period, the buck switch will stay off until the FB voltage again falls below 2.5V. During start-up, the FB voltage will be below 2.5V at the end of each on- time, resulting in the minimum off-time of 300 ns. Bias current at the FB pin is nominally 100 nA. Over-Voltage Comparator The feedback voltage at FB is compared to an internal 2.875V reference. If the voltage at FB rises above 2.875V the on-time pulse is immediately terminated. This condition can occur if the input voltage, or the output load, change suddenly. The buck switch will not turn on again until the voltage at FB falls below 2.5V. On-Time Generator and Shutdown The on-time for the SM74301 is determined by the RT resistor, and is inversely proportional to the input voltage (Vin), resulting in a nearly constant frequency as Vin is varied over its range. The on-time equation for the SM74301 is: TON = 1.385 x 10 -10 x R T / VIN (4) 8 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Links: SM74301 |
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