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LM22671-Q1 Scheda tecnica(PDF) 8 Page - Texas Instruments

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Il numero della parte LM22671-Q1
Spiegazioni elettronici  LM22671/-Q1 42 V, 500 mA SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LOGIC
OSC
+
-
TYPE III
COMP
+
-
1.285V/SS
INT REG, EN,UVLO
GND
RT/SYNC
SW
BOOT
VIN
EN
FB
SS
VIN
VOUT
Error Amp.
PWM Cmp.
Vcc
ILimit
50 µA
LM22671, LM22671-Q1
SNVS589N – SEPTEMBER 2008 – REVISED NOVEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM22671 incorporates a voltage mode constant frequency PWM architecture. In addition, input voltage feed-
forward 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.
The internal loop compensation of the -ADJ option is optimized for outputs of 5 V and below. If an output voltage
of 5 V or greater is required, the -5.0 option can be used with an external voltage divider. The minimum output
voltage is equal to the reference voltage, that is, 1.285 V (typ).
7.2 Functional Block Diagram
8
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