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LM27150T-1.5 데이터시트(PDF) 10 Page - HTC Korea TAEJIN Technology Co. |
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LM27150T-1.5 데이터시트(HTML) 10 Page - HTC Korea TAEJIN Technology Co. |
10 / 11 page 1.5A Very L.D.O Voltage Regulator LM27150/27151/27152 Dec. 2011 – Rev.1.3.1 - 10 - HTC Capacitor Requirements For stability and minimum output noise, a capacitor on the regulator output is necessary. The value of this capacitor is dependent upon the output current; lower currents allow smaller capacitors. LM27150 regulators are stable with the 10uF minimum capacitor values at full load. Where the regulator is powered from a source with a high AC impedance, a 0.1uF capacitor connected between input and GND is recommended. This capacitor should have good characteristics to above 250kHz. Minimum Load Current The LM27150 regulators are specified between finite loads. If the output is too small, leakage currents is too small, leakage currents dominate and the output voltage rises. The 5mA minimum load current swamps any expected leakage current across the operating temperature range. Adjustable Regulator Design The adjustable regulator versions, LM27152 allows programming the output voltage anywhere between 1.25V and the 25V maximum operating rating of the family. Two resistors are used. Resistors can be quite large, up to 1MΩ, because of the very high input impedance and low bias current of the sense comparator: The resistor values are calculated by: ) 1 ‐ V V ( 2 =R 1 R REF OUT Where VOUT is desired output voltage, Figure 2 shows component definition. Applications with widely varying load currents may scale the resistors to draw the minimum load current required for proper operation. VIN OUT EN ADJ GND COUT + R1 R2 CIN + VIN VOUT VOUT = 1.240 x [1 + (R1/R2)] Figure 2. Adjustable Regulator with Resistors Error Flag LM27151 versions feature and Error Flag, which looks at the output voltage and signals and error condition when this voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an over-current fault (the device is in current limit) and low input voltage. The flag output is inoperative during over temperature shutdown conditions. |
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