IN WIN Power Man IP-P600CQ3-2 Power Supply Review

Secondary Analysis

This power supply comes with seven Schottky rectifiers attached to its secondary heatsink.

The maximum theoretical current each line can deliver is given by the formula I / (1 – D) where D is the duty cycle used and I is the maximum current supported by the rectifying diode. Just as an exercise, we can assume a typical duty cycle of 30%.

The +12 V output uses two PFR30L60CT Schottky rectifiers (30 A, 15 A per internal diode at 120° C, 0.60 V maximum voltage drop) for the direct rectification and two PFR40L60CT Schottky rectifiers (40 A, 20 A per internal diode at 120° C, 0.60 V maximum voltage drop), giving us a maximum theoretical current of 86 A or 1,029 W for the +12 V output.

The +5 V output uses two PFR30L45CT Schottky rectifiers (30 A, 15 A per internal diode at 120° C, 0.52 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for the +5 V output.

The +3.3 V is generated using a DC-DC converter installed on the +12 V line, and available on a small daughterboard. This DC-DC converter is based on a uP6124 PWM controller and two STD85N3LH5 MOSFETS, each one supporting up to 80 A at 25° C or up to 55 A at 100° C in continuous mode, or up to 320 A at 25° C in pulse mode, with an RDS(on) of only 5 mΩ.

Figure 14: +5 V and +12 V rectifiers

Figure 15: +3.3 V DC-DC converter

Figure 16: +3.3 V DC-DC converter

The seventh rectifier is used by the +5VSB output.

The secondary is monitored by a WT7525 integrated circuit. This chip over voltage protection (OVP), under voltage protection (UVP), and over current protection (OCP) with four channels (two for +12 V, one for +5 V, and one for +3.3 V). Even though this circuit has two +12 V OCP channels, this power supply has four +12 V rails, and as we could clearly see the presence of four current sensors (“shunts”), so there is a circuit to expand these two inputs to be able to support two sensors each.

Figure 17: Monitoring circuit

Electrolytic capacitors of the secondary are all from OST.