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TPS61093QDSKTQ1 Fiches technique(PDF) 8 Page - Texas Instruments

No de pièce TPS61093QDSKTQ1
Description  TPS61093-Q1 Low Input Boost Converter With Integrated Power Diode and Input/Output Isolation
Download  27 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS61093QDSKTQ1 Fiches technique(HTML) 8 Page - Texas Instruments

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OUT
SW
Ramp
Generator
Oscillator
CurrentSensor
FB
GND
+
EA
PWMControl
CP1
CP2
EN
Gate
Driver
Ref.
VO
VIN
Gate
Driver
Precharge
On/offcontrol
EN
SS
Soft
Startup
C/P
TPS61093-Q1
SLVSCO6 – JANUARY 2015
www.ti.com
8 Detailed Description
8.1 Overview
The TPS61093-Q1 is a highly integrated boost regulator for up to 17-V output. In addition to the on-chip 1-A
PWM switch and power diode, this IC also integrates an output-side isolation switch as shown in the functional
block diagram. One common issue with conventional boost regulators is the conduction path from input to output
even when the PWM switch is turned off. It creates three problems, which are inrush current during start-up,
output leakage current during shutdown, and excessive over load current. In the TPS61093-Q1, the isolation
switch turns off under shutdown-mode and over load conditions, thereby opening the current path. However,
shorting the VO and OUT pins bypasses the isolation switch and enhances efficiency. Because the isolation
switch is on the output side, the IC's VIN pin and power stage input power (up to 10 V) can be separated.
The TPS61093-Q1 adopts current-mode control with constant pulse-width-modulation (PWM) frequency. The
switching frequency is fixed at 1.2-MHz typical. PWM operation turns on the PWM switch at the beginning of
each switching cycle. The input voltage is applied across the inductor and the inductor current ramps up. In this
mode, the output capacitor is discharged by the load current. When the inductor current hits the threshold set by
the error amplifier output, the PWM switch is turned off, and the power diode is forward-biased. The inductor
transfers its stored energy to replenish the output capacitor. This operation repeats in the next switching cycle.
The error amplifier compares the FB-pin voltage with an internal reference, and its output determines the duty
cycle of the PWM switching. This closed-loop system requires frequency compensation for stable operation. The
device has a built-in compensation circuit that can accommodate a wide range of input and output voltages. To
avoid the sub-harmonic oscillation intrinsic to current-mode control, the IC also integrates slope compensation,
which adds an artificial slope to the current ramp.
8.2 Functional Block Diagram
8
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