ADVANCE INFORMATION
Data Sheet PD 60178A
IR1175
Synchronous Rectifier Driver
Features
n Provides constant and proper g...
ADVANCE INFORMATION
Data Sheet PD 60178A
IR1175
Synchronous Rectifier Driver
Features
n Provides constant and proper gate drive to power
MOSFETs regardless of transformer output n Minimizes loss due to power
MOSFET body drain diode conduction n Stand alone operation - no ties to primary side n Schmitt trigger input with double pulse suppression allows operation in noisy environments n High current drive capability - 2A n High speed operation - 2MHz n Adaptable to multiple topologies (such as singleended forward, double-ended forward)
Product Summary
Vdd IO+/Fmax Max lead time 5Vdc 2A/2A 2MHz 500nsec
Description
The IR1175 is a high speed
CMOS controller designed to drive N-channel power
MOSFETs used as synchronous rectifiers in high current, high frequency forward converters with output
voltages equal or below 5VDC. Schmitt trigger inputs with double pulse suppression allow the controller to operate in noisy environments. The circuit does not require any ties to the primary side and derives its operating power directly from the secondary. The circuit functions by anticipating transformer output transitions, then turns the power
MOSFETs on or off before the transitions of the transformer to minimize body drain diode conduction and reduce associated losses. Turn on/off lead time can be adjusted to accommodate a variety of power
MOSFET sizes and circuit conditions. The IR1175 also provides gate drive overlap/dead-time control via external components to further minimize diode...