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LM34919 датащи(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM34919
подробное описание детали  Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM34919 датащи(HTML) 8 Page - National Semiconductor (TI)

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30004434
FIGURE 1. Start Up Sequence
Functional Description
The LM34919 Step Down Switching Regulator features all the
functions needed to implement a low cost, efficient buck bias
power converter capable of supplying at least 0.6A to the load.
This high voltage regulator contains an N-Channel buck
switch, is easy to implement, and is available in micro SMD
package. The regulator’s operation is based on a constant on-
time control scheme, where the on-time is determined by
V
IN. This feature allows the operating frequency to remain
relatively constant with load and input voltage variations. The
feedback control requires no loop compensation resulting in
very fast load transient response. The valley current limit de-
tection circuit, internally set at 0.64A, holds the buck switch
off until the high current level subsides. This scheme protects
against excessively high current if the output is short-circuited
when V
IN is high.
The LM34919 can be applied in numerous applications to ef-
ficiently regulate down higher voltages. Additional features
include: Thermal shutdown, V
CC under-voltage lockout, gate
drive under-voltage lockout, and maximum duty cycle limiter.
Control Circuit Overview
The LM34919 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 internal ref-
erence (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 until the FB voltage falls below
the reference but not less than the minimum off-time. The
buck switch then turns on for another on-time period. Typi-
cally, during start-up, or when the load current increases
suddenly, the off-times are at the minimum. Once regulation
is established, the off-times are longer.
When in regulation, the LM34919 operates in continuous con-
duction mode at heavy load currents and discontinuous con-
duction mode at light load currents. In continuous conduction
mode current always flows through the inductor, never reach-
ing zero during the off-time. In this mode the operating fre-
quency remains relatively constant with load and line
variations. The minimum load current for continuous conduc-
www.national.com
8


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logo
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