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LM25007 Datasheet(PDF) 9 Page - Texas Instruments |
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LM25007 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 19 page + + + 7V SERIES REGULATOR SW LM25007 VIN BST VCC SELF-BIAS DIODE 0.01 PF 0.1 PF 10V 10k 30k LM25007 www.ti.com SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013 Figure 7. Self Biased Configuration Over-Voltage Comparator The over-voltage comparator is provided to protect the output from overvoltage conditions due to sudden input line voltage changes or output loading changes. The over-voltage comparator monitors the FB pin versus an internal 2.875V reference. If the voltage at FB rises above 2.875V the comparator immediately terminates the buck switch on-time pulse. ON Time generator and Shutdown The on-time of the LM25007 is set inversely proportional to the input voltage by an external resistor connected between RON/SD and VIN. The RON/SD terminal is a low impedance input biased at approximately 1.5V. The current through the resistor and into the RON/SD pin is approximately proportional to Vin and used internally to control the on-timer. This scheme of input voltage feed-forward hysteretic operation achieves nearly constant operational frequency over varying line and load conditions. The on-time equation for the LM25007 is : Ton = 1.42 x 10 -10 x R ON / VIN (4) The RON/SD pin of the LM25007 also provides a shutdown function which disables the regulator and significantly decreases quiescent power dissipation. By pulling the pin below 0.7V activates the low power shutdown mode. The VIN quiescent current in the shutdown mode is approximately 100µA internal to the LM25007 plus the current in the RON resistor. See Figure 8. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM25007 |
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