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LM34919BQTL датащи(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM34919BQTL
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)

LM34919BQTL датащи(HTML) 11 Page - National Semiconductor (TI)

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30102734
FIGURE 1. Start Up Sequence
Functional Description
The LM34919B 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 LM34919B can be applied in numerous applications to
efficiently 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 LM34919B 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 LM34919B operates in continuous
conduction mode at heavy load currents and discontinuous
conduction mode at light load currents. In continuous con-
duction mode current always flows through the inductor, nev-
er reaching zero during the off-time. In this mode the
operating frequency remains relatively constant with load and
line variations. The minimum load current for continuous con-
11
www.national.com


Аналогичный номер детали - LM34919BQTL

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
LM34919BQTL/NOPB TI-LM34919BQTL/NOPB Datasheet
1Mb / 27P
[Old version datasheet]   Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919BQTLX/NOPB TI-LM34919BQTLX/NOPB Datasheet
1Mb / 27P
[Old version datasheet]   Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
More results

Аналогичное описание - LM34919BQTL

производительномер деталидатащиподробное описание детали
logo
National Semiconductor ...
LM34919 NSC-LM34919_08 Datasheet
387Kb / 18P
   Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator
logo
Texas Instruments
LM34919 TI1-LM34919_14 Datasheet
1Mb / 21P
[Old version datasheet]   Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919B TI-LM34919B_15 Datasheet
1Mb / 27P
[Old version datasheet]   Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919 TI1-LM34919_15 Datasheet
1Mb / 21P
[Old version datasheet]   Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
LM34919C-Q1 TI1-LM34919C-Q1 Datasheet
1Mb / 29P
[Old version datasheet]   LM34919C-Q1 Ultra Small 50V, 600 mA Constant On-Time Buck Switching Regulator
LM34923 TI1-LM34923_14 Datasheet
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LM5006 TI1-LM5006_14 Datasheet
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[Old version datasheet]   80V, 600 mA Constant On-Time Buck Switching Regulator
LM5006 TI-LM5006_15 Datasheet
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[Old version datasheet]   LM5006 80V, 600 mA Constant On-Time Buck Switching Regulator
LM34923 TI1-LM34923 Datasheet
1Mb / 26P
[Old version datasheet]   80-V 600-mA Constant On-Time Buck Switching Regulator
LM5008A TI1-LM5008A_14 Datasheet
1Mb / 22P
[Old version datasheet]   350 mA Constant On-Time Buck Switching Regulator
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