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UCC39002DR Datasheet(PDF) 7 Page - Texas Instruments |
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UCC39002DR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 30 page 500Ω 100 kΩ 1 CS− 2 CS+ 3 VDD 4 GND 13.5 V to 15 V + Enable and Bias OK + Disconnect Switch gM + 3 V + 8 CSO 7 LS 6 EAO 5 ADJ Load Share Bus Driver + 3 V Load Share Bus Receiver VBIAS Fault Protection Error Amp Adjust Amp Current Sense Amp Start Up and Adjust Logic Copyright © 2016, Texas Instruments Incorporated 7 UCC29002, UCC29002-1, UCC39002 www.ti.com SLUS495I – SEPTEMBER 2001 – REVISED MAY 2016 Product Folder Links: UCC29002 UCC39002 Submit Documentation Feedback Copyright © 2001–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The UCC39002 is an advanced, high-performance, low-cost load-share controller that provides all the necessary functions to parallel multiple independent power supplies and modules. The UCC39002 can easily parallel currently available and popular synchronous buck converters, such as those designed with the TPS40050 controller. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Differential Current Sense Amplifier (CS+, CS −, CSO) The UCC39002 features a high-gain and high-precision amplifier to measure the voltage across a low-value current sense resistor. Because the amplifier is fully uncommitted, the current sense gain is user programmable. The extremely low input offset voltage of the UCC39002 current sense amplifier makes it suitable to measure current information across a low value sense resistor. Furthermore, the input common mode range includes ground and the positive supply rail of the UCC39002 (VDD). Accordingly, the current sense resistor can be placed in the ground return path or in the positive output rail of the power supply VO as long as VO ≤ VDD. The current sense amplifier is not unity gain stable and must have a minimum gain of three. 7.3.2 Load Share Bus Driver Amplifier (CSO) This is a unity-gain buffer amplifier to provide separation between the load share bus voltage and the output of the current sense amplifier. The circuit implements an ideal diode with virtually 0-V forward voltage drop by placing the diode inside the feedback loop of the amplifier. The diode function is used to automatically establish the role of the master module in the system. The UCC39002 which is assigned to be the master uses the load share bus driver amplifier to copy its output current information on to the load share bus. |
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