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LM1771USD Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce LM1771USD
Description  Low-Voltage Synchronous Buck Controller
Download  31 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM1771USD Fiches technique(HTML) 9 Page - Texas Instruments

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FB
VIN
ON TIMER
High-Side
Driver
0.8V
Q
Vin
LM1771
REGULATION
COMPARATOR
Q
OFF TIMER
GND
HG
LG
Level Shift
and
Shoot
Through
Protection
Low-Side
Driver
SHORT
CIRCUIT
PROTECTION
0.55 V
/Soft-Start
UVLO
UVLO
SD
SD
Q
Q
R
S
Q
Q
R
S
1.2 V
EN
ENABLE
COMPARATOR
LM1771
www.ti.com
SNVS446D – JUNE 2006 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM1771 synchronous buck controller has a control scheme that is referred to as adaptive ON-time control.
This topology relies on a fixed switch ON-time to regulate the output voltage. This ON-time is internally set by
EEPROM and is available with three different set-points to allow for different frequency options. The LM1771
automatically adjusts the ON-time during operation inversely with the input voltage (VIN) to maintain a constant
frequency. Therefore the switching frequency during continuous conduction mode is independent of the inductor
and capacitor size unlike hysteretic switchers.
At the beginning of the cycle, the LM1771 turns on the high-side PFET for a fixed duration. This ON-time is
predetermined (internally set by EEPROM and adjusted by VIN) and the switch does not turn off until the timer
has completed its period. The PFET then turns off for a minimum predetermined time period. This minimum TOFF
of 150 ns is internally set and cannot be adjusted. This is to prevent false triggering from occurring on the
comparator due to noise from the SW node transition. After the minimum TOFF period has expired, the PFET
remains off until the comparator trip-point has been reached. Upon passing this trip-point (set at 0.8 V at the
feedback pin), the PFET turns back on and the process repeats, thus regulating the output.
The NFET control is complementary to the PFET control with the exception of a short dead-time to prevent
shoot-through from occurring.
7.2 Functional Block Diagram
Copyright © 2006–2016, Texas Instruments Incorporated
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