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LM22677 датащи(PDF) 8 Page - Texas Instruments

номер детали LM22677
подробное описание детали  LM22677/-Q1 42-V, 5-A 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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LM22677 датащи(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
VIN
VOUT
Error Amp.
PWM Cmp.
Vcc
ILimit
FB
LM22677, LM22677-Q1
SNVS582O – SEPTEMBER 2008 – REVISED AUGUST 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM22677 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 (typical).
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 (typical) will turn off the regulator. The current drain from the input supply, in this state, is
25 µA (typical) 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 (typical) to turn the regulator on. The hysteresis on
this input is about 0.6 V (typical) above the 1.6 V (typical) 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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Product Folder Links: LM22677 LM22677-Q1


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