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LM3495 датащи(PDF) 11 Page - Texas Instruments

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номер детали LM3495
подробное описание детали  Emulated Peak Current Mode Buck Controller for Low Output Voltage
Download  35 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LM3495 датащи(HTML) 11 Page - Texas Instruments

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VLIN5
VIN
TRACK
FB
COMP
/SD
CSL
LG
ILIM
SW/
CSH
HG
BOOST
INTERNAL
SOFT-
START
HICCUP
+
-
PWM
COMP
+
-
20 PA
PWM LOGIC CONTROL
AND
DRIVER CONTROL
2V
RAMP
GENERATOR
AND SLOPE
COMPENSATION
INTERNAL
4.7V
REGULATOR
VLIN5
SHOOT-
THROUGH
PROTECT
ADAPTIVE DUTY CYCLE
AND SKIP MODE CONTROL
OSCILLATOR
AND
SYNCHRONIZATION
CONTROL
IRAMP
IFREQ
IFREQ
CLAMPED:
LO 0.9V
HI 2.0V
IRAMP
PGND
SGND
FPWM
SNS
FREQ/
SYNC
5 PA
FROM
LG
TO SHOOT-
THROUGH
PROTECT
SHUTDOWN
VREF
= 0.6V
2 PA
LM3495
www.ti.com
SNVS410E – FEBRUARY 2006 – REVISED NOVEMBER 2007
Block Diagram
Applications Information
THEORY OF OPERATION
The LM3495 is an advanced, current mode PWM synchronous controller. Unlike traditional peak current mode
controllers which sense the current while the high-side FET is on, the LM3495 senses current while the low-side
FET is on. The LM3495 then emulates the peak current waveform and uses that information to regulate the
output voltage. High-side ON pulses as low as 50 ns are possible to achieve low duty cycle operation. The
LM3495 therefore enjoys both excellent line transient response and the ability to regulate low output voltages
from high input voltages.
Copyright © 2006–2007, Texas Instruments Incorporated
Submit Documentation Feedback
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