By replacing the external Schottky diode with an integrated efficient MOSFET along with the multimode operation, today's synchronous solution provides superior efficiency in the most compact designs.
The UCC27282-Q1 is a robust N-channel MOSFET driver with a maximum switch node(HS) voltage rating of 100 V. It allows for two N-channel MOSFETs to be controlled in half-bridge or synchronous buck configuration based topologies.
Improve Two-Phase Buck Converter Performance with a- Maxim Keywords: buck converter, two-phase, coupled-choke, synchronous buck converter, interleaved multiphase converters, reduced phase ripple, Related Parts Abstract: Interleaved multiphase converters or synchronous buck converters are usually employed to supply power to microprocessors.
Details are explained in the section on IC selection, but these different models are provided because an appropriate compulsion OFF time must be selected based on the conditions of the circuit in which synchronous rectification is implemented.
By contrast, the synchronous rectifying type, starting with the inroads made into battery-powered devices, including laptop PCs, has now become a standard power supply unit for mobile devices, for which high efficiency is essential.
The InnoSwitch IC incorporates the primary FET, the primary-side controller, a secondary-side controller for synchronous rectification and an innovative new FluxLink™ technology that eliminates the need for an optocoupler.
Design Procedure An example of synchronous rectification design of an AC/DC converter with diode rectification using a BM1R001xxF series secondary-side synchronous rectifying controller IC is presented.
For example, the circuit in Figure 1 employs several loss-minimizing features, including synchronous rectification, integrated low-resistance MOSFETs, low quiescent-current consumption, and a pulse-skipping control architecture.
Our N-channel MOSFET portfolio is designed to meet a broad range of requirements for synchronous rectification, UPS, motor control, SMPS, power-over-Ethernet(PoE), inverter and automotive applications.
CCM, DCM, and PFM operation modes. Synchronous Rectification with Boost Converters Using synchronous rectification with boost and buck-boost converters is not quite so straightforward.
In the case of synchronous rectification, D1 is replaced with a switching element(transistor), which is turned on and off in operation opposite that of Q1, but the basics are the same.
The PX3684 digital 4-phase power controller provides voltage regulation to today' s high current memory applications by driving up to four synchronous-rectified buck converter channels in parallel.
Figure 3. This step-up switching regulator lacks synchronous rectification, but is otherwise similar to the step-down type, with inputs and outputs swapped.
The circuit uses the MAX17606 secondary synchronous rectifier driver in a 6-pin SOT23 package, as well as the MAX17597 peak current mode flyback controller in a 16-pin TQFN package.
The result is that the lower dissipation synchronous rectifier MOSFET can now be integrated into a control IC such as the MAX17503 with lower overall converter temperature rise, 30°C in this example.
Here we present an example of synchronous rectification design of an AC/DC converter that normally uses diode rectification, employing the BM1R001xxF series of secondary-side synchronous rectifying controller ICs.
Figure 1. Step-down converter ICs, such as the MAX1556, employ features like low-resistance MOSFETs and synchronous rectification to achieve efficiency that consistently exceeds 95%, as shown in the accompanying graph.
Example of Power Loss Calculation for a Power Supply IC(Case of a synchronous rectification IC with an internal MOSFET) The graphic below illustrates the relevant details from the standpoint of power supply IC losses.
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