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TPS60243DGKTG4 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS60243DGKTG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 22 page Oscillator 0° 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 Submit Documentation Feedback 7 Product Folder Links: TPS60240 TPS60241 TPS60242 TPS60243 |
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