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LM5010SD Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM5010SD
Description  High Voltage 1A Step Down Switching Regulator
Download  19 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5010SD Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Start-up Regulator (V
CC)
(Continued)
Regulation Comparator
The feedback voltage at FB is compared to the voltage at the
Softstart pin (2.5V, ±2%). In normal operation (the output
voltage is regulated) an on-time period is initiated when the
voltage at FB falls below 2.5V. The buck switch stays on for
the on-time causing the FB voltage to rise above 2.5V. After
the on-time period the buck switch stays off until the FB
voltage falls below 2.5V. Bias current at the FB pin is less
than 5 nA over temperature.
Over-Voltage Comparator
The feedback voltage at FB is compared to an internal 2.9V
reference. If the voltage at FB rises above 2.9V the on-time
is immediately terminated. This condition can occur if the
input voltage, or the output load, change suddenly. The buck
switch will not turn on again until the voltage at FB falls below
2.5V.
ON-Time Control
The on-time of the internal switch (see Figure 5) is deter-
mined by the R
ON resistor and the input voltage (VIN), cal-
culated from the following:
(5)
The inverse relationship of t
ON vs. VIN results in a nearly
constant frequency as V
IN is varied. If the application re-
quires a high frequency the minimum value for t
ON, and
consequently R
ON, is limited by the off-time (265 ns, ±15%)
which limits the maximum duty cycle at minimum V
IN. The
tolerance for Equation 5 is ±25%. Frequencies in excess of
1 MHz are possible with the LM5010.
Shutdown
The LM5010 can be remotely shut down by taking the
R
ON/SD pin below 0.65V. See Figure 11. In this mode the
softstart pin is internally grounded, the on-timer is disabled,
and the input current at V
IN is reduced (Figure 7). Releasing
the R
ON/SD pin allows normal operation to resume. When
the switch is open, the nominal voltage at R
ON/SD is shown
in Figure 6.
20119916
FIGURE 10. Self Biased Configuration
20119918
FIGURE 11. Shutdown Implementation
www.national.com
11


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