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LM5010MHX Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM5010MHX Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 19 page  Typical Performance Characteristics (Continued) Functional Description The LM5010 Step Down Switching Regulator features all the functions needed to implement a low cost, efficient buck bias power converter capable of supplying in excess of 1A to the load. This high voltage regulator contains an N-Channel buck switch, is easy to implement, and is available in the thermally enhanced LLP-10 and TSSOP-14EP packages. The regulator’s operation is based on a hysteretic control scheme, and uses an on-time which varies inversely with V IN. This feature results in the operating frequency remain- ing relatively constant with load and input voltage variations. The switching frequency can range from 100 kHz to > 1.0 MHz. The hysteretic control requires no loop compensation resulting in very fast load transient response. The valley current limit detection circuit, internally set at 1.25A, holds the buck switch off until the high current level subsides. Figure 1 shows the functional block diagram. The LM5010 can be applied in numerous applications to efficiently regu- late down higher voltages. This regulator is well suited for 48V telecom applications, as well as the new 42V automo- tive power bus. Implemented as a Point-of-Load regulator following a highly efficient intermediate bus converter can result in high overall system efficiency. Features include: Thermal shutdown, V CC under-voltage lockout, gate drive under-voltage lockout, and maximum duty cycle limit. Hysteretic Control Circuit Overview The LM5010 buck DC-DC regulator employs a control scheme based on a comparator and a one-shot on-timer, with the output voltage feedback (FB) compared to an inter- nal reference (2.5V). If the FB voltage is below the reference the buck switch is turned on for a time period determined by the input voltage and a programming resistor (R ON). Follow- ing the on-time the switch remains off for 265 ns, or until the FB voltage falls below the reference, whichever is longer. The buck switch then turns on for another on-time period. 20119911 FIGURE 8. Startup Sequence www.national.com 9 |
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