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TPS60240DGKTG4 데이터시트(PDF) 7 Page - Texas Instruments

부품명 TPS60240DGKTG4
상세설명  TPS6024x 170-Vrms Zero-Ripple Switched Capacitor Buck-Boost Converter for VCO Supply
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Oscillator
180°
Control
Circuit With
Thermal and
Overload
Protection
Reference
_
+
Charge Pump 1
Charge Pump 2
VIN
C1+
C1–
C1
C2+
C2–
C2
VOUT
GND
EN
TPS60240, TPS60241, TPS60242, TPS60243
www.ti.com
SLVS372C – JUNE 2001 – REVISED OCTOBER 2015
7 Detailed Description
7.1 Overview
The TPS6024x device is a fixed-frequency, dual-phase charge pump that provides 25 mA of continuous supply
current for low-noise applications such as VCOs used in mobile phones and wireless applications.
Low-noise operation results from using a proprietary dual-phase charge pump topology that relies on an
operational amplifier in the feedback loop to reduce ripple. During the first phase, C1 is charged to the supply
voltage. Pin C1+ is connected to VIN, and C1– is connected to GND. In the second phase, C1– is connected to the
output of the operational amplifier, and C1+ is connected to VOUT. The operational amplifier then adjusts its output
until the output VOUT delivers the correct voltage to make the resistor divided feedback point equal to the
reference voltage. During this second phase, C2 is charged to supply voltage. Terminal C2– is connected to GND,
and C2+ is connected to VIN. Phase one is then repeated with C2, now acting to provide charge to the output in
place of C1, which is connected to the supply. The dual-phase operation lowers the output ripple voltage
significantly compared to a standard single-phase charge pump. In addition, the linear feedback of the
operational amplifier eliminates the ripple during discharge of the output capacitor (COUT).
7.2 Functional Block Diagram
Copyright © 2001–2015, Texas Instruments Incorporated
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Product Folder Links: TPS60240 TPS60241 TPS60242 TPS60243


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