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Switching Power Supplies A to Z
Switching Power Supplies A to Z, by Sanjaya Maniktala (Newnes), starting at $45.00
Home » Power
BFG MX-550 Power Supply Review
Author: Gabriel Torres
Type: Reviews Last Updated: December 3, 2008
Page: 4 of 10
$ Check REAL-TIME pricing for Bfg Technologies Tech MX-550 ATX12V & EPS12V Power Supply Not Available BFGI550WMXPSU $.
PCRush: $106.59

Primary Analysis
Hardware Secrets Silver Award

Let’s now take an in-depth look on the primary stage from MX-550. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.

This power supply uses one GBU1006 rectifying bridge on its primary, capable of delivering up to 10 A at 100º C if a heatsink is used, which is the case. This is more than adequate rating for a 500 W power supply. The reason why is that at 115 V this unit would be able to pull up to 1,150 W from the power grid; assuming 80% efficiency, the bridge would allow this unit to deliver up to 920 W without burning this component. Of course we are only talking about this component and the real limit will depend on all other components from the power supply.

BFG MX-550 Power Supply
click to enlarge
Figure 9: Rectifying bridge.

MX-550 uses two SPP16N50C3 power MOSFET transistors on its active PFC circuit, each one capable of delivering up to 10 A at 100º C (or 16 A at 25º C, see the difference temperature makes) in continuous mode or up to 48 A in pulse mode.

The active PFC capacitor is Japanese from Matsushita (Panasonic) and labeled at 85º C.

BFG MX-550 Power Supply
click to enlarge
Figure 10: Active PFC transistors and diode.

This power supply uses two SPA16N50C3 power MOSFET transistors on the traditional two-transistor forward configuration on its switching section. These transistors are identical to the ones used on the active PFC circuit except for the packaging (TO220 vs. TO220FP).

BFG MX-550 Power Supply
click to enlarge
Figure 11: Switching transistors.

The primary is controlled by a CM6800 integrated circuit installed on a small printed circuit board. This component is the most popular PWM/PFC combo controller.

BFG MX-550 Power Supply
click to enlarge
Figure 12: PFC/PWM controller.

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