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LM22674 датащи(PDF) 8 Page - Texas Instruments

номер детали LM22674
подробное описание детали  LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHER짰 Step-Down Voltage Regulator with Features
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM22674 датащи(HTML) 8 Page - Texas Instruments

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LOGIC
OSC
+
-
TYPE III
COMP
+
-
1.285V
&
Soft-start
INT REG, EN,UVLO
GND
SW
BOOT
VIN
EN
FB
VIN
VOUT
Error Amp.
PWM Cmp.
Vcc
ILimit
LM22674, LM22674-Q1
SNVS590M – SEPTEMBER 2008 – REVISED NOVEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM22674 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 5V 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
7.3 Feature Description
7.3.1 Precision Enable and UVLO
The precision enable input (EN) is used to control the regulator. The precision feature allows simple sequencing
of multiple power supplies with a resistor divider from another supply. Connecting this pin to ground or to a
voltage less than 1.6 V (typ) will turn off the regulator. The current drain from the input supply, in this state, is
25 µA (typ) at an input voltage of 12 V. The EN input has an internal pullup of about 6 µA. Therefore this pin can
be left floating or pulled to a voltage greater than 2.2 V (typ) to turn the regulator on. The hysteresis on this input
is about 0.6 V (typ) above the 1.6 V (typ) threshold. When driving the enable input, the voltage must never
exceed the 6 V absolute maximum specification for this pin.
8
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Copyright © 2008–2014, Texas Instruments Incorporated
Product Folder Links: LM22674 LM22674-Q1


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