shaynet
Newbie level 4
help needed with switching power supply reliability concerns
i'm currently working on a project in which i will pwm control a lot of leds (current draw will be around 10-15 amps) and i want to power the project using a switching power supply
most likely i will be using a 5v power supply from this series:
**broken link removed**
i will be controlling all of the leds at the same time using an arduino threw a single mosfet (switching frequency will be 500-1000 Hz)
and i got worried that turning on and off a current this high might damage the power supply, am i right?
i thought of putting a big capacitor across the supply to minimize current spikes though i have a couple of questions since i'm not familiar with switching power supplies:
what voltage should it be? (i know that switching power supplies have voltage spikes or maybe those spikes are the 100mV ripple from the datasheet?) 10V? 16V?
what capacitance should it be? 10000uF? 20000uF?
could there be a problem when powering on the circuit (a very big current draw when charging the capacitor when powering on)?
i want to power the arduino from the same supply, could there be a problem when powering from the same supply that powers a power demand that big (voltage spiking or an unstable voltage because of the pwm switching of these 10-15 amps)? and what can i do about it?
maybe a capacitor next to the atmega chip?
i'm currently working on a project in which i will pwm control a lot of leds (current draw will be around 10-15 amps) and i want to power the project using a switching power supply
most likely i will be using a 5v power supply from this series:
**broken link removed**
i will be controlling all of the leds at the same time using an arduino threw a single mosfet (switching frequency will be 500-1000 Hz)
and i got worried that turning on and off a current this high might damage the power supply, am i right?
i thought of putting a big capacitor across the supply to minimize current spikes though i have a couple of questions since i'm not familiar with switching power supplies:
what voltage should it be? (i know that switching power supplies have voltage spikes or maybe those spikes are the 100mV ripple from the datasheet?) 10V? 16V?
what capacitance should it be? 10000uF? 20000uF?
could there be a problem when powering on the circuit (a very big current draw when charging the capacitor when powering on)?
i want to power the arduino from the same supply, could there be a problem when powering from the same supply that powers a power demand that big (voltage spiking or an unstable voltage because of the pwm switching of these 10-15 amps)? and what can i do about it?
maybe a capacitor next to the atmega chip?
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