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LM1085 データシート(PDF) 7 Page - HTC Korea TAEJIN Technology Co. |
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LM1085 データシート(HTML) 7 Page - HTC Korea TAEJIN Technology Co. |
7 / 8 page 3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed) LM1085 RIPPLE REJECTION The ripple rejection values are measured with the adjustment pin bypassed. The impedance of the adjust pin capacitor at the ripple frequency should be less than the value of R1 (normally 100Ω to 120Ω) for a proper bypassing and ripple rejection approaching the values shown. The size of the required adjust pin capacitor is a function of the input ripple frequency. If R1=100Ω at 120Hz the adjust pin capacitor should be 25uF. At 100kHz only 0.22uF is needed. The ripple rejection will be a function of output voltage, in circuits without an adjust pin bypass capacitor. The output ripple will increase directly as a ratio of the output voltage to the reference voltage (V OUT/VREF) OUTPUT VOLTAGE The LM1085 series develops a 1.25V reference voltage between the output and the adjust terminal. Placing a resistor between these two terminals causes a constant current to flow through R1 and down throuth R2 to set the overall output voltage. This current is normally the specified minium load current of 10mA. Because IADJ is very small and constant it represents a small error and it can usually be ignored. Figure 11. LOAD REGULATION True remote sheet specification it is not possible to provide, because the LM1085 is a three terminal device. The resistance of the wire connecting the regulator to the load will limit the load regulation. The data sheet specification for load regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. The best load regulation is obtained when the top of the resistor divider R1 is connected directly to the case not to the load. If R1 were connected to the load, the effective resistance between the regulator and the load would be: Figure 12. [RPX(R2+R1)]/R1 , RP = Parasitic Line Resistance Connected as shown Figure.12 RP is not multiplied by the divider ratio. Using 16-gauge wire the parasitic line resistance is about 0.004Ω per foot, transllating to 4mV/ft at 1A load current. HTC - 7 - LM1085 LM1085 |
同様の部品番号 - LM1085 |
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同様の説明 - LM1085 |
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