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onsemi website assistant and I was built to help you
navigate our website and show
you our useful features. I will
try my best to find what you need!
I am your friendly onsemi website assistant and I was built to help you
navigate our website and show you our useful features. I will try my best to find
what you need!
I am your friendly
onsemi website assistant and I was built to help you
navigate our website and show
you our useful features. I will
try my best to find what you need!
I am your friendly onsemi website assistant and I was built to help you
navigate our website and show you our useful features. I will try my best to find
what you need!
The NCP1623 is a controller designed to drive PFC boost stages. Based on an innovative Valley Synchronized Frequency Fold-back (VSFF) method, it operates in critical conduction mode (CrM) until the power drops below a threshold level. The PFC controller enters discontinuous conduction mode (DCM) with increased dead-time as the load further decays (frequency foldback). VSFF maximizes the efficiency at both nominal and light loads. In addition, an internal circuitry ensures a near-unity power factor even when the switching frequency is reduced.
Housed in a TSOP-6 package, the circuit also incorporates the features necessary for robust and compact PFC stages, with few external components. The A version provides the follower boost capability for drastic low-line efficiency improvement. This controller is also available in the SOIC-8 package, which features an ultra-low-consumption mode externally controlled by the disable pin.
特性
优势
Critical Conduction Mode (CrM) in heavy load conditions
Maximizes the efficiency at both nominal and light loads
Discontinuous Conduction Mode (DCM) with Frequency Foldback in light load
Maximizes the efficiency at both nominal and light loads
Follower Boost capability (NCP1623A only)
Improves low line and full load efficiency
Sleep Mode with circuit consumption below 100 µA (SOIC-8 version only)