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LM3411M5X-5.0 데이터시트(PDF) 8 Page - National Semiconductor (TI) |
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LM3411M5X-5.0 데이터시트(HTML) 8 Page - National Semiconductor (TI) |
8 / 13 page Applications Information The LM3411 regulator/driver provides the reference and feedback drive functions in a regulated power supply. It can also be used together with many different types of regula- tors, (both linear and switching) as well as other power semi- conductor devices to add precision and improve regulation specifications. Output voltage tolerances better than 0.5% are possible without using trim pots or precision resistors. One of the main applications of the LM3411 is to drive an opto-isolator to provide feedback signal isolation in a switch- ing regulator circuit. For low current applications, (up to 250 mA) the circuit shown in Figure 3 provides good regulation and complete input/output electrical isolation. For an input voltage of 15V, this circuit can provide an output of either 3.3V or 5V with a load current up to 250 mA with ex- cellent regulation characteristics. With the part values shown, this circuit operates at 80 kHz., and can be synchro- nized to a clock or an additional LM3578. (See LM1578 data sheet for additional information.) An isolated DC/DC flyback converter capable of higher out- put current is shown in Figure 4. This circuit utilizes the LM2577 SIMPLE SWITCHER™ voltage regulator for the Pulse Width Modulation (PWM), power switch and protection functions, while the LM3411 provides the voltage reference, gain and opto coupler drive functions. In this circuit, the ref- erence and error amplifier in the LM2577 are not used (note that the feedback pin is grounded). The gain is provided by the LM3411. Since the voltage reference is located on the secondary side of the transformer, this circuit provides very good regulation specifications. The output of a switching regulator typically will contain a small ripple voltage at the switching frequency and may also contain voltage transients. These transient voltage spikes can be sensed by the LM3411 and could give an incorrect regulation voltage. An RC filter consisting of a 1 Ω resistor and a 100 nF capacitor will filter these transients and mini- mize this problem. The 1 Ω resistor should be located on the ground side of the LM3411, and the capacitor should be physically located near the package. DS011987-15 FIGURE 3. Isolated 250 mA Flyback Switching Regulator DS011987-16 FIGURE 4. Isolated 1.5A Flyback Switching Regulator Using a LM2577 www.national.com 8 |
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