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TPS40211-Q1 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS40211-Q1
Description  4.5-V to 52-V Input Current Mode Boost Controller
Download  44 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40211-Q1 Fiches technique(HTML) 10 Page - Texas Instruments

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background image
+
+
Soft Start
and
Overcurrent
5
FB
4
COMP
3
DIS/EN
700 mV
LDO
PWM
Logic
2
SS
1
RC
Oscillator
and
Slope
Compensation
UVLO
Driver
9
BP
10 VDD
8
GDRV
6
GND
7
ISNS
+
Gain = 6
+
150 mV
LEB
OC Fault
OC Fault
UDG-07107
Enable E/A
E/A
SS Ref
10
TPS40210, TPS40211
SLUS772F – MARCH 2008 – REVISED MARCH 2015
www.ti.com
Product Folder Links: TPS40210 TPS40211
Submit Documentation Feedback
Copyright © 2008–2015, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The TPS4021x is a peak current-mode control low-side controller with a built in 400-mA gate driver designed to
drive n- channel MOSFETs at a fixed frequency. The frequency is adjustable from 35 kHz to 1000 kHz. Small
size combined with complete functionality makes the part both versatile and easy to use.
The controller uses a low-value current-sensing resistor in series with the power MOSFET's source connection to
detect switching current. When the voltage drop across this resistor exceeds 150 mV, the part enters an hiccup
fault mode with a time period set by the external soft-start capacitor.
The TPS40210 uses voltage feedback to an error amplifier that is biased by a precision 700-mV reference. The
TPS40211 has a lower 260-mV reference for higher efficiency in LED drive applications. Internal slope
compensation eliminates the characteristic sub-harmonic instability of peak current mode control with duty cycles
of 50% or greater.
The TPS4021x also incorporates a soft-start feature where the output follows a slowly rising soft-start voltage,
preventing output-voltage overshoot. The DIS/EN disables the TPS40210 putting it in a low quiescent current
shutdown mode.
7.2 Functional Block Diagram


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