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Which is the input voltage in SMPS circuit?
Let’s start with the input. An input supply voltage is the first thing which will be used by the SMPS and will be transformed into a useful value to feed the load. As this design is specified for AC-DC conversion, the input will be Alternating current (AC). For India, the input AC is available in 220-230 volt, for the USA it is rated for 110 volts.
Which is the targeted output ripple for SMPS?
It is 12V and 1.25A. The targeted output ripple is selected as less the 30mV pk-pk at 20000 Hz bandwidth. Every SMPS circuit requires a Power Management IC also known as switching IC or SMPS IC or Drier IC. Let’s sum up the design considerations to select the ideal Power Management IC that will be suitable for our design.
How is the construction of a SMPS different?
Depending on the load the construction of an SMPS can be different. For this SMPS the load is assumed as a resistive load. However, there is nothing like a resistive load, each load consists of at least some amount of inductance and capacitance; here it is assumed that the inductance and capacitance of the load are negligible.
Which is SMPS resistor does under voltage lockout protection?
Under-voltage lockout protection is done by the sense resistor R1 and R2. It is used when the SMPS goes into the auto-restart mode and sense the line voltage. D1 and D2 are the clamp circuit. D1 is the TVS diode and D2 is an ultra-fast recovery diode.
Where does the 50 Hz dc signal come from in SMPS?
The AC input supply signal 50 Hz is given directly to the rectifier and filter circuit combination without using any transformer. This output will have many variations and the capacitance value of the capacitor should be higher to handle the input fluctuations. This unregulated dc is given to the central switching section of SMPS.
What does SMPS stand for in power supply?
SMPS stands for switch mode power supply and it’s the modern and most compact/efficient way of acquiring low voltage DC from mains AC source. However making an SMPS at home may not be as simple as making power supply units using traditional iron core transformers.