This is very simple electronic circuit project of dual step-down power-supply (smps) controller circuit using the MAX17031. Dual step-down power-supply (SMPS) controller can be designed a very simple high efficiency power supply circuit with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems.

Dual Step-Down Power-Supply (SMPS) Controller Circuit Diagram:


 Low-side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. Combined with the output overvoltage and undervoltage protection features, this current limit ensures robust output supplies.

The device includes independent shutdown controls with well-defined logic thresholds to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms period.

The Max17031 can be used in applications like : Notebook Computers , Ultra-Mobile PC , Main System Supply (5V and 3.3V Supplies), 2 to 4 Li+ Cells Battery-Powered Devices , Telecommunication

Main features of Max 17031 are : Dual Quick-PWM , Preset 5V and 3.3V Outputs , Internal 100mA, 5V Linear Regulator , Internal OUT1 LDO5 Bypass Switch , Secondary Feedback (SKIP Input) Maintains Charge Pump , 3.3V, 5mA Real-Time Clock (RTC) Power (Always On) , 2V ±1% 50μA Reference , 6V to 24V Input Range , Pulse-Skipping/Forced-PWM/Ultrasonic Mode Control , Independent SMPS and LDO5 Enable Controls , Combined SMPS PGOOD Outputs , Minimal Component Count.

This power supply Electronic Circuit Project is an very simple 115 Vac Converter, designed using the NCL30100 compact switching regulator controller designed for high brightness LED driver applications where efficiency and small size are very important.

115 Vac Converter Circuit Diagram:

Here is Electronic Project of Laser Power Supply circuit, ICl is a 555 timer running at about 16 kHz. This IC drives Ql, a TIP146, which produces a 12-V square wave across Tl primary. This produces between 800 and 2,000 V across the secondary, which is doubled to 3 to 5 kV.

Laser Power Supply Circuit Diagram:



When the load (laser) on the power supply increases, current Q2 is turned on, which energizes RY1. This changes the duty cycle of the 555 timer, lb adjust this supply, set R12 and R13 at the center. Adjust R12 until the laser tube triggers, and make sure that the relay pulls in. If the relay chatters, adjust R12. If the full-clockwise adjustment of R12 fails to ignite the tube, adjust R13.

Since very large currents were involved, a certain Mr. Van Ark figured out a solution for this.  He used a glass tube filled with a liquid containing a red pigment and a metal ball. When  a large current discharge occurred the metal  ball shot up due to the strong magnetic field,  which caused the pigment to mix with the liquid. This could be seen for a good 24 hours after the event. After a thunder storm it was  easy to see where a discharge current took  place: one only had to walk past the tubes  and have a good look at them.