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LM5010A Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM5010A Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 17 page  Functional Description The LM5010A Step Down Switching Regulator features all the functions needed to implement a low cost, efficient buck DC-DC converter capable of supplying in excess of 1A to the load. This high voltage regulator integrates an 80V N-Channel buck switch, with an easy to implement constant on-time controller. It is available in the thermally enhanced LLP-10 and TSSOP-14EP packages. The regulator com- pares the feedback voltage to a 2.5V reference to control the buck switch, and provides a switch on-time which varies inversely with VIN. This feature results in the operating frequency remaining relatively constant with load and input voltage variations. The switching frequency can range from less than 100 kHz to 1.0 MHz. The regulator requires no loop compensation resulting in very fast load transient response. The valley current limit circuit holds the buck switch off until the free-wheeling inductor current falls below the current limit threshold, nominally set at 1.25A. The LM5010A can be applied in numerous applications to efficiently step down higher DC voltages. This regulator is well suited for 48V telecom applications, as well as the 42V automotive power bus. Features include: Thermal shutdown, VCC under-voltage lock-out, gate drive under-voltage lock- out, and maximum duty cycle limit. Control Circuit Overview The LM5010A employs a control scheme based on a com- parator and a one-shot on-timer, with the output voltage feedback (FB) compared to an internal 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). Following the on-time the switch remains off for a fixed 260 ns off-time, or until the FB voltage falls below the reference, whichever is longer. The buck switch then turns on for another on-time period. Refer- ring to the Block Diagram, the output voltage is set by R1 and R2. The regulated output voltage is calculated as fol- lows: V OUT = 2.5V x (R1 + R2) / R2 (1) 20153811 FIGURE 1. Startup Sequence www.national.com 8 |
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