Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs
19-3045; Rev 0; 10/03
www.DataSheet4U.com
Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Genera...
19-3045; Rev 0; 10/03
www.DataSheet4U.com
Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs
General Description
The MAX5058/MAX5059 enable secondary-side synchronous rectification in isolated power supplies using widely available power
MOSFETs. These devices facilitate the commutation of the secondary-side
MOSFETs by providing a clean gate-drive signal that is synchronized to the power
MOSFET switching in the primary side of the isolation transformer. The MAX5058/MAX5059 complement the MAX5051 and MAX5042/MAX5043 primaryside PWM ICs and enable the design of high-efficiency synchronously rectified isolated power supplies. Simultaneous conduction of the primary side and the freewheeling synchronous rectifier
MOSFET is avoided by having a look-ahead signal (before the primary-side
MOSFETs turn ON), thus eliminating large current spikes resulting from a shorted transformer secondary. An on-board error amplifier with a versatile current reference output enables virtually unlimited possibilities in reference-
voltage generation. Reference
voltage for the error amplifier is generated by connecting an appropriate resistor to this output. Low on-resistance margining
MOSFETs integrated onchip allow for implementation of a margining circuit without the use of external switches. The MAX5058 provides a 5V LDO output for logic-level
MOSFETs while the MAX5059 provides a 10V LDO output for conventional 10V
MOSFETs. The MAX5058/MAX5059 are designe...