SMPS 5V@5A 25 watt solution:

 Specification’s
of
SMPS 5V @ 5A
you can manufacture, switched-mode power supply
(SMPS) (SMPS 5V @ 5A) is an electronic power
supply unit (PSU) that incorporates a switching
=>regulator. The salient features are enlisted below:
=>Input: 170 to 300 VAC ; 47 - 53 Hz, 3 wire
=>Output: 5 V @ 5 A
=>Line and Load Regulation: 1 %
=>Output Ripple: 1 %,
=>Operating Temperature: -10 to 50 deg C ; RH 95 % non condensing
=>Output Isolation: 1.5 KV rms @ 50 Hz for 1 minute.
=>Other Features: Input over voltage latch protection • Output over
voltage latch protection • Over temperature protection
• Output short circuit protection • Input EMI-RFI
filters • Screw type input / output connectors • Output
LED indication • Integrated MOSFET and PWM
controllers for greater reliability and space saving
=>Efficiency: >77 % at full load and normal I/P
=>Stand by power: <0.2W
=>Output variation: Approx. ±5% through preset.

25 watt power supply schematic :

I will make easy for u: 

list of material :1

list of material:2

transformer design: for 5volt @5amp.

Testing procedure
for

5volt @5amp.
1. Turn the output voltage adjustment preset to maximum. Connect to
normal input voltage and turn on the SMPS to check if it shuts down.
It should not shut down.
2. Adjust preset for rated output voltage.
3. Load the SMPS for rated full load.
4. Vary the AC input supply by variac from 170 to 300VAC and note if
there is any major change in output voltage.
5. Increase input voltage greater than 300VAC to check line overvoltage
shutdown.
6. Measure Drain voltage of device. At 420VDC input it should be a
maximum of 630V.
7. Check the input voltage at which the SMPS shuts down and gets
latched (input over voltage latching shutdown). It should be less than
440 volts.
8. Check the output voltage at which the SMPS shuts down and gets
latched (output over voltage latching shutdown). It should be greater
than the maximum adjustment limit of output adjustment preset.
9. Perform a High-voltage test of 1.5KV for 1 minute –
a. Between Input and Output.
b. Between Input and Earth.

PCB layout guideline

thanks 

kaushalesh singh(9716933131)