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LM25007SD データシート(PDF) 9 Page - Texas Instruments

部品番号 LM25007SD
部品情報  LM25007 42V, 0.5A Step-Down Switching Regulator
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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LM25007SD データシート(HTML) 9 Page - Texas Instruments

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7V SERIES REGULATOR
SW
LM25007
VIN
BST
VCC
SELF-BIAS
DIODE
0.01 PF
0.1 PF
10V
10k
30k
LM25007
www.ti.com
SNVS401C – JANUARY 2006 – REVISED FEBRUARY 2013
Figure 7. Self Biased Configuration
Over-Voltage Comparator
The over-voltage comparator is provided to protect the output from overvoltage conditions due to sudden input
line voltage changes or output loading changes. The over-voltage comparator monitors the FB pin versus an
internal 2.875V reference. If the voltage at FB rises above 2.875V the comparator immediately terminates the
buck switch on-time pulse.
ON Time generator and Shutdown
The on-time of the LM25007 is set inversely proportional to the input voltage by an external resistor connected
between RON/SD and VIN. The RON/SD terminal is a low impedance input biased at approximately 1.5V. The
current through the resistor and into the RON/SD pin is approximately proportional to Vin and used internally to
control the on-timer. This scheme of input voltage feed-forward hysteretic operation achieves nearly constant
operational frequency over varying line and load conditions. The on-time equation for the LM25007 is :
Ton = 1.42 x 10
-10 x R
ON / VIN
(4)
The RON/SD pin of the LM25007 also provides a shutdown function which disables the regulator and
significantly decreases quiescent power dissipation. By pulling the pin below 0.7V activates the low power
shutdown mode. The VIN quiescent current in the shutdown mode is approximately 100µA internal to the
LM25007 plus the current in the RON resistor. See Figure 8.
Copyright © 2006–2013, Texas Instruments Incorporated
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