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LM22670QMRX-5.0/NOPB bảng dữ liệu(PDF) 8 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  42-V, 3-A SIMPLE SWITCHER, Step-Down Voltage Regulator With Features
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LM22670QMRX-5.0/NOPB bảng dữ liệu(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
LM22670, LM22670-Q1
SNVS584P – SEPTEMBER 2008 – REVISED NOVEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM22670 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.
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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Product Folder Links: LM22670 LM22670-Q1


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