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LM22680-Q1 Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças LM22680-Q1
Descrição Electrónicos  42 V, 2 A SIMPLE SWITCHER Step-Down Voltage Regulator With Features
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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LM22680-Q1 Folha de dados(HTML) 8 Page - Texas Instruments

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LOGIC
OSC
+
-
TYPE III
COMP
+
-
1.285V
&
Soft-Start
INT REG, EN,UVLO
GND
RT/SYNC
SW
BOOT
VIN
EN
FB
VIN
VOUT
Error Amp.
PWM Cmp.
Vcc
ILimit
LM22680, LM22680-Q1
SNVS595L – SEPTEMBER 2008 – REVISED NOVEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM22680 device incorporates a voltage mode constant frequency PWM architecture. In addition, input
voltage feedforward is used to stabilize the loop gain against variations in input voltage. This allows the loop
compensation to be optimized for transient performance. The power MOSFET, in conjunction with the diode,
produce a rectangular waveform at the switch pin, that swings from about zero volts to VIN. The inductor and
output capacitor average this waveform to become the regulator output voltage. By adjusting the duty cycle of
this waveform, the output voltage can be controlled. The error amplifier compares the output voltage with the
internal reference and adjusts the duty cycle to regulate the output at the desired value.
7.2 Functional Block Diagram
8
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