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LM3460M5-1.5 データシート(PDF) 5 Page - National Semiconductor (TI) |
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LM3460M5-1.5 データシート(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Product Description The LM3460 is a shunt regulator designed for use as a pre- cision control element in a feedback loop. The regulated out- put voltage is sensed between the IN pin and GROUND pin of the LM3460. The output of the LM3460 sources current whenever the voltage at the IN pin reaches the regulated voltage. This current is used to cut off the drive to the external pass trnasistor, which provides the negative feedback to force the output voltage to be the same value as V REG. If the voltage on the IN pin is forced above the V REG voltage, the maximum voltage applied to the IN pin should not ex- ceed 20V. In addition, an external resistor may be required on the OUT pin to limit the maximum current to 20 mA. Compensation The inverting input of the error amplifier is brought out to sim- plify closed-loop compensation. Typically, compensation is provided by a single capacitor connected from the COM- PENSATION pin to the OUT pin of the LM3460. Applying a load pulse to the output of the regulator circuit and observing the output voltage response is a good method of verifying the stability of the control loop. If excessive ringing on the output waveform is observed, this usually indicates marginal stability resulting from insufficient phase margin. Test Circuit The test circuit shown in Figure 3 can be used to measure various LM3460 parameters. Test conditions are set by forc- ing the appropriate voltage at the V OUT Set test point and se- lecting the appropriate R L or IOUT as specified in the Electri- cal Characteristics section. Use a DVM at the ″measure″ test points to read the data. Setting the Output Voltage If a regulated voltage is desired which is not available as a standard voltage, the output voltage may be adjusted by us- ing an external resistive divider (see Figure 4): DS012603-9 V OUT Set Note: 0V to 500 mV for LM3460-1.5 0V to 200 mV for LM3460-1.2 FIGURE 3. Test Circuit www.national.com 5 |
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同様の説明 - LM3460M5-1.5 |
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