The Power supply spec:
1. Input voltage: 100vac - 270Vac (Wide input)
2. Output constant current: 400mAmp.
3. Output Voltage: 48vDC
4. Ultra high efficiency around 90%
5. Max mechanical Dimensions: [L x W x H] : 25cm x 1.0cm x 0.8cm
6. Max cost 8USD.
It is preffered to implement by Microcontroler (additional cost) like Microchip in order to use PWM at the output and remote communication.