16grams, 25x25x16mm, 3Watt – this is the Myrra 48000

Myrra builds on the success of the 47000 series with the new AC/DC converter series 48000. Let's check some of its features in the given example.

This is an archive article published 04/17/2018. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

Converter has to supply electronic device with micro controller with nominal supply voltage of 3.3V. Ambient temperature range is -20 to 80°C. Current consumption is 20uA in sleep mode, max consumption is 250mA.

We have two options in this case: using model 48021 or 48022 + linear or switching voltage regulator 5/3.3V.

Model 48021

1. output voltage accuracy: E1 = ±5%
2. output voltage load regulation: E2 = ±5%
3. dynamic response, 50-100% load change: ±10% rated output voltage
4. output voltage line regulation: E3 = ±5%
5. ripple & noise: 200mV p-p.

Microcontroller’s maximal operating voltage is typically 3.6V, absolute max voltage is typically 4V. Voltage higher than 4V can damage the microcontroller.
In the worst case scenario, DC output voltage can be 3.3V + E1 + E2 + E3 = 3.795V > 3.6V. When we add ±0.33V overshoots and ripple 200mV p-p, output voltage can reach 4.325V > 4V.

Brief worst case analysis has shown us that model 48021 is not suitable for our device.

Model 48022 + Voltage Regulator 5/3.3V

This variant is more expensive but it will certainly meet all requirements. We need to determine if we are going to use linear or switching voltage regulator 5/3.3V. Linear regulator is cheaper but are we able to provide adequate heatsink for it?

In the worst case, DC output voltage of 48022 can be Vout=5V + E1 + E2 + E3= 5 + 5% + 5% + 3% = 5.65V. Power dissipation at max current consumption 250mA is 0.25*(5.65 – 3.3) =0.59W.

Let’s consider max chip (junction) temperature 105°C to avoid overheating of components in the close vicinity of the regulator. For ambient temperature 80°C, we need the thermal resistance between the junction and the environment to be less than (105-80)/0.59=42.4K/W. When we use regulator housed in WDFN-6 with exposed pad (thermal resistance between junction and pad 5.4K/W), we will need approximately 13.5cm2 of 4-layer PCB (AN-2020 Thermal Design By Insight, Not Hindsight).

In this case, it is not necessary to use switching voltage regulator, PCB required for cooling the linear regulator is acceptable. This solution is therefore technically feasible.

If you are interested in  48000 Series or in any of Myrra products, or you need more information, we are ready to help at myrra@soselectronic.com

Features:

  • Direct replacement for EE20 size transformers
  • Output power 3W up to ambient temperature 50°C, 2.5W at 60°C and 1W at 80°C
  • Output voltage 3.3 to 24V
  • Short circuit output protection
  • Standby power consumption less than 0.15W
  • Safety standards VDE, ENEC, UL

Do not miss these articles

Do you like our articles? Do not miss any of them! You do not have to worry about anything, we will arrange delivery to you.

Main products

48021 MYRRA
in stock 0 pcs
Currently in stock 91 pcs
Reserved for customers 2500 pcs
Currently available 0 pcs
If you are interested in bigger quantity that is currently available in stock, please contact our sales assistant or click on Get Quote.
(09/02/2022: 3200 pcs)
(09/23/2022: 1000 pcs)

48021

PCB Mount AC/DC Converters

AC/DC Power Supply for PCB 2,75W 3,3V/0,83A Regulated

Ord.number: 287944

MYRRA

1 pcs+ 4,53 €

5 pcs+ 4,05 €

25 pcs+ 3,41 €

100 pcs+ 2,99 €

ORDER:
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
48022 MYRRA
in stock 0 pcs
Currently in stock 200 pcs
Reserved for customers 3195 pcs
Currently available 0 pcs
If you are interested in bigger quantity that is currently available in stock, please contact our sales assistant or click on Get Quote.
(06/03/2022: 1200 pcs)
(06/17/2022: 1200 pcs)
(09/23/2022: 2200 pcs)

48022

PCB Mount AC/DC Converters

AC/DC Power Supply for PCB 3W 5V/0,6A Regulated

Ord.number: 288315

MYRRA

1 pcs+ 4,31 €

5 pcs+ 3,85 €

25 pcs+ 3,24 €

100 pcs+ 2,84 €

ORDER:
  • ADD TO CART
  • Get Quote
  • Add to favorites
  • Add to watchdog
  • Add item to compare
Do you agree with cookies being stored?
Welcome to the SOS electronic website. Before you enter our online world, we would like to ask you to allow us to store cookies on your browser. Your consent will help us view the site without error, measure its performance, and track additional statistics. Apart from that, we can bring you an offer of our products and services, literally tailor-made. We also provide cookies to third parties. However, you are definitely safe with us.
The proper operation of the website
More stable technical control
Better marketing offer

More about cookies
More about personal data processing