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LM3477 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LM3477 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 23 page  Functional Block Diagram 20003301 Functional Description General Description The LM3477/A is a switching regulator controller for topolo- gies incorporating a high side switch. The most common of these topologies is the step-down, or buck, converter. Other topologies such as the inverting (buck-boost) and inverse SEPIC (zeta) converters can be realized. This datasheet will focus on buck converter applications. The LM3477/A employs current mode control architecture. Among the many benefits of this architecture are superior line and load regulation, cycle-by-cycle current limiting, and simple loop compensation. The LM3477/A features a pat- ented adjustable slope compensation scheme to enable flex- ible inductor selection. The LM3477/A has a combination of features that allow its use in a wide variety of applications. The input voltage can range from 2.97V to 35V, with the output voltage being positive or negative depending on the topology. The current limit can be scaled to safely drive a wide range of loads. An internal soft-start is provided to limit initial in-rush current. Output over voltage and input under voltage protection ensure safe operation of the LM3477/A. Regions of Operation Pulse width modulation (PWM) is the normal mode of opera- tion. In PWM, the output voltage is well regulated and has a ripple frequency equal to the switching frequency (500kHz). In low load conditions, the part operates in hysteretic mode. In this mode, the output voltage is regulated between a high and low value that results in a higher ripple magnitude and lower ripple frequency than in PWM mode (see OVER VOLT- AGE PROTECTION section). 200033J2 FIGURE 1. Operating Regions of the LM3477/A www.national.com 10 |
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