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LM117K 数据表(PDF) 9 Page - Texas Instruments |
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LM117K 数据表(HTML) 9 Page - Texas Instruments |
9 / 38 page LM117, LM317-N www.ti.com SNVS774L – MAY 2004 – REVISED FEBRUARY 2011 Typical Performance Characteristics (continued) Output Capacitor = 0 μF unless otherwise noted Line Transient Response Load Transient Response Figure 24. Figure 25. APPLICATION HINTS In operation, the LM117 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of (1) Since the 100 μA current from the adjustment terminal represents an error term, the LM117 was designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. External Capacitors An input bypass capacitor is recommended. A 0.1 μF disc or 1μF solid tantalum on the input is suitable input bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when adjustment or output capacitors are used but the above values will eliminate the possibility of problems. The adjustment terminal can be bypassed to ground on the LM117 to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. With a 10 μF bypass capacitor 80dB ripple rejection is obtainable at any output level. Increases over 10 μF do not appreciably improve the ripple rejection at frequencies above 120Hz. If the bypass capacitor is used, it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device. Copyright © 2004–2011, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM117 LM317-N |
类似零件编号 - LM117K |
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类似说明 - LM117K |
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