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LMZ12003EXT Scheda tecnica(PDF) 10 Page - Texas Instruments

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Il numero della parte LMZ12003EXT
Spiegazioni elettronici  3A SIMPLE SWITCHER Power Module With 20-V Maximum Input Voltage for Demanding Environments and Rugged Applications
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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0.47 éF
6.8 éH
Co
CIN
Cvcc
FB
EN
SS
Vin
Linear reg
RON
Timer
Css
RON
RFBT
RFBB
CFF
Regulator IC
VO
Internal
Passives
VOUT
GND
VIN 1
2
3
4
5
6
7
LMZ12003EXT
SNVS663H – JUNE 2010 – REVISED AUGUST 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LMZ12003EXT power module is an easy-to-use step-down DC-DC solution capable of driving up to 3-A load
with exceptional power conversion efficiency, line and load regulation, and output accuracy.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 COT Control Circuit Overview
Constant ON-Time control is based on a comparator and an ON-time one-shot, with the output voltage feedback
compared with an internal 0.8-V reference. If the feedback voltage is below the reference, the main MOSFET is
turned on for a fixed ON-time determined by a programming resistor RON. RON is connected to VIN such that on-
time is reduced with increasing input supply voltage. Following this ON-time, the main MOSFET remains off for a
minimum of 260 ns. If the voltage on the feedback pin falls below the reference level again the ON-time cycle is
repeated. Regulation is achieved in this manner.
7.3.2 Output Overvoltage Comparator
The voltage at FB is compared to a 0.92-V internal reference. If FB rises above 0.92 V the ON-time is
immediately terminated. This condition is known as overvoltage protection (OVP). It can occur if the input voltage
is increased very suddenly or if the output load is decreased very suddenly. Once OVP is activated, the top
MOSFET ON-times will be inhibited until the condition clears. Additionally, the synchronous MOSFET will remain
on until inductor current falls to zero.
7.3.3 Current Limit
Current limit detection is carried out during the OFF-time by monitoring the current in the synchronous MOSFET.
Referring to the Functional Block Diagram, when the top MOSFET is turned off, the inductor current flows
through the load, the PGND pin and the internal synchronous MOSFET. If this current exceeds 4.2A (typical) the
current limit comparator disables the start of the next ON-time period. The next switching cycle will occur only if
the FB input is less than 0.8 V and the inductor current has decreased below 4.2 A. Inductor current is monitored
during the period of time the synchronous MOSFET is conducting. So long as inductor current exceeds 4.2 A,
further ON-time intervals for the top MOSFET will not occur. Switching frequency is lower during current limit due
to the longer OFF-time.
10
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