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--- modular_synthesizers:negative_buck [2024/06/20 20:31] – [What do commercial modules consume and how are they built?] utedass
+++ modular_synthesizers:negative_buck [2024/06/22 10:08] (current) – [Implementing a negative buck regulator] utedass
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-====== Other work on the topic ======
+===== Other work on the topic =====
-[[https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/The-Parallel-Universe-of-Negative-Input-Voltages.pdf|The Parallel Universe of Negative Input Voltages]]
 [[https://www.analog.com/en/resources/technical-articles/positive-buck-regulator-makes-negative-boost-dcdc-converter.html|Positive Buck Regulator Makes Negative Boost DC/DC Converter]]
 [[https://www.ti.com/lit/an/slyt516/slyt516.pdf?ts=1717195408219&ref_url=https%253A%252F%252Fwww.google.com%252F|Designing a negative boost converter from a standard positive buck converter]]
+====== Implementing a negative buck regulator ======
+{{:modular_synthesizers:normal_buck.png?300}}
+{{:modular_synthesizers:negative_buck.png?300}}
+===== The Parallel Universe of Negative Input Voltagess =====
+[[https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/The-Parallel-Universe-of-Negative-Input-Voltages.pdf|The Parallel Universe of Negative Input Voltages]]
+By John Betten and Brian King suggests using a UCC3813 with an external switch mosfet and also provides a circuit to adjust the feedback voltage to make the reference work properly.
+{{:modular_synthesizers:parallel_negative_fig3.png?500}}
+It is (according to me) a bit easier if we rewrite the circuit and remove some compensation capacitors like this:
+{{:modular_synthesizers:parallel_negative_fig3_better.png?500}}
 ===== Risks and other considerations =====
 There are also some risks that needs some investigation before this can be deemed a good way forth.