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 primary-side 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 on-chip 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 designed to enable paralleling of multiple power supplies for accurate current sharing using a simple 2-wire, differential, current-share bus. Parallelability enables expansion of the power capabilities and simplifies thermal management in high-output-current applications. When used with the MAX5051, the primaries can also be synchronized and operated 180 degrees out of phase.
The MAX5058/MAX5059 are available in a 28-pin thermally enhanced TSSOP package and operate over a wide -40°C to +125°C temperature range.
Warning: The MAX5058/MAX5059 are designed to work in circuits that contain high voltages. Exercise caution.
Key Features
Applications/Uses
Clean Drive Waveforms for Synchronous MOSFETs
Utilization of a Look-Ahead Signal from the Primary for Proper Turn-On/Turn-Off Times
Synchronous Rectifier Drivers Capable of Sourcing and Sinking Up to 2A Peak Current
Internal Gate-Voltage Regulator for 5V (MAX5058) or 10V (MAX5059) Gate-Drive Voltage
Internal Error Amplifier
Accurate Differential Current-Share/Force Circuit Allows Paralleling of Several Power Supplies for High Output Current
Internal Remote Voltage-Sense Amplifier
Flexible Reference-Voltage Generation
Output Voltage Regulation Down to 0.5V
Low Quiescent Current Consumption of 2.5mA
Integrated Digital Output Margining Circuit Saves External Parts and Board Space
30ns Propagation Delay Time from Pulse Input to Output
Automatic Detection of Discontinuous Current Conduction and Turn-Off of the Freewheeling MOSFET
High Efficiency at Low Output Currents and Reverse-Current Protection
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
Download
E-Mail
