LDM #360: Reverse engineering of a Russian missile electronic board

This video shows the reverse engineering of a Russian electronic board. The reference of the board is “TDCK“. It is the power supply board of a satellite communication receiver used in several Russian missiles. 00:00 - Intro 00:04 - Overview 05:08 - Reverse engineering part 1: overall description 06:07 - part 2: 12V DC-DC converter 09:05 - part 3: voltage monitor circuits 13:14 - part 4: and DC-DC converters 13:57 - part 5: DC-DC converters shutdown circuits 16:00 - part 6: standby power supply Notes: Most parts are US or European parts. It is obvious that Russia don’t have the modern technology to design such board with their own parts. Russian parts: * The toroidal transformer * The 10A fuse * Maybe the electrochemical capacitor Main parts used on this power supply: * UCC28084 (Texas) PWM controller for the 12V power supply * TPS54356 and TPS54357 (Texas) PWM controllers for and 5V Power Supplies * MAX974 (Analog Devices) Quad comparators with internal voltage reference * IRF7328 (Infineon) dual P-channel MOSFET * MJD112 (ON Semi) NPN Darlington * FDS4488 (On Semi) N-channel MOSFET * IRFR5305 (Infineon) P-channel MOSFET * SI4156 (Vishay) N-channel MOSFET Weird things: * The grid of one unused MOSFET is left open * What is the purpose of the fuse ? What will happen to the missile if the fuse blows ?