Between the transformer and secondary board, a vertical plastic wall was added to help conduct heat from the secondary PCB down into the main board and into the transformer, to help remove heat from the synchronous rectifier
8) namely that [t.sub.dt_on] should be kept as short as possible and [t.sub.dt_off] should be optimized for the commutating voltage switching the synchronous rectifier
on just before body diode conduction.
In some cases, the synchronous rectifier
MOSFET body diode maintains output inductor current during the on/off transitions.
To increase the total efficiency, synchronous rectifiers
(SR) comprised of MOSFETs with low [R.sub.DS(on)] are used.
austriamicrosystems' AS1320 step-up DC/DC converter with fully integrated synchronous rectifier
eliminates the need for external transistors.
The NPX20 DC/DC converters are based on a synchronous rectifier
technology, and they are designed to meet the requirements of UL 60950.
The LT1952 uses one primary side MOSFET and provides synchronous rectifier
control for high operating efficiency without the need for an external MOSFET driver or timing circuitry.
The converters use a synchronous buck regulator topology with synchronous rectifier
timing, and they can generate up to 15A with a very high full load efficiency of 92 percent.
The converters use a synchronous buck regulator topology with precision synchronous rectifier
timing, and they can generate up to 15A with a high full load efficiency of 92 percent.
The low-side gate-trivet output can be configured to automatically switch on during the PWM off time, thereby acting as a synchronous rectifier
. A feature of the A3946 is the flexibility of the two input These can either be tied together to allow for a single PWM input signal, or they can be driven independently to provide direct control over the high-side and low-side gate drive outputs.
An internal synchronous rectifier
eliminates the cost and size of an external diode and improves efficiency, especially at low output voltages; 3.6 V input to 3.3 V output is 97 percent efficient at 50 mA and 87 percent at 1 mA.
In addition, the drivers feature matched internal propagation delays between A and B channels for applications requiring dual gate drives with critical timing, such as synchronous rectifiers