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TPS62290-Q1 Fiches technique(PDF) 8 Page - Texas Instruments

No de pièce TPS62290-Q1
Description  1-A Step Down Converter in 2-mm2-mm SON Package
Download  27 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS62290-Q1 Fiches technique(HTML) 8 Page - Texas Instruments

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Zero-Pole
AMP.
Integrator
Error Amp
PFM Comp .
+1% Voltage positioning
PWM
Comp .
VREF
Gate Driver
Anti
Shoot-Through
Current
Limit Comparator
Current
Limit Comparator
VREF + 1%
FB
FB
MODE
SW
EN
VIN
Softstart
VOUT RAMP
CONTROL
Reference
0.6 V VREF
Limit
High Side
Limit
Low Side
Sawtooth
Generator
Int. Resistor
Network
FB
RI1
RI..N
Mode
GND
2.25 MHz
Oscillator
Thermal
Shutdown
Undervoltage
Lockout 1.8 V
Control
Stage
Copyright © 2016, Texas Instruments Incorporated
8
TPS62290-Q1, TPS62293-Q1
SLVSAI5B – SEPTEMBER 2010 – REVISED JUNE 2016
www.ti.com
Product Folder Links: TPS62290-Q1 TPS62293-Q1
Submit Documentation Feedback
Copyright © 2010–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS6229x-Q1 step-down converter operates with typically 2.25-MHz fixed frequency pulse width modulation
(PWM) at moderate to heavy load currents. At light-load currents, the converter can automatically enter Power
Save Mode and operates then in PFM mode.
During PWM operation, the converter uses a unique fast-response voltage mode controller scheme with input
voltage feedforward to achieve good line and load regulation, allowing the use of small ceramic input and output
capacitors. At the beginning of each clock cycle initiated by the clock signal, the high-side MOSFET switch is
turned on. The current flows now from the input capacitor through the high-side MOSFET switch through the
inductor to the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips
and the control logic turns off the switch. The current limit comparator also turns off the switch if the current limit
of the high-side MOSFET switch is exceeded. After a dead time preventing shoot-through current, the low-side
MOSFET rectifier is turned on, and the inductor current ramps down. The current flows now from the inductor to
the output capacitor and to the load. It returns to the inductor through the low-side MOSFET rectifier.
The next cycle is initiated by the clock signal again turning off the low-side MOSFET rectifier and turning on the
high-side MOSFET switch.
8.2 Functional Block Diagram


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