ON Semiconductor

The NCP1652 is a highly integrated controller for implementing power factor correction (PFC) and isolated step down ac-dc power conversion in a single stage, resulting in a lower cost and reduced part count solution. This controller is ideal for notebook adapters, battery chargers and other off-line applications with power requirements between 75 W and 150 W. The single stage is based on the flyback converter and it is designed to operate in continuous conduction (CCM) or discontinuous conduction (DCM) modes.The NCP1652 increases the system efficiency by incorporating a secondary driver with adjustable nonoverlap delay for controlling a synchronous rectifier switch in the secondary side, an active clamp switch in the primary or both. In addition, the controller features a proprietary Soft-Skip™ to reduce acoustic noise at light loads. Other features found in the NCP1652 include a high voltage startup circuit, voltage feedforward, brown out detector, internal overload timer, latch input and a high accuracy multiplier.

The NCP1654 is a controller for Continuous Conduction Mode (CCM) Power Factor Correction Step up preconverters. It controls the power switch conduction time (PWM) in fixed frequency mode and is dependant on the instantaneous coil current. Housed in a SO-8 package the circuit minimizes the number of external components and drastically simplifies the PFC implementation. It also integrates high safety features that make the NCP1654 a driver for robust and compact PFC stages like an effective input power runaway clamping circuit.

The NCP1681 is a PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. The controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.

The NCP170 series of CMOS low dropout regulators are designed specifically for portable battery-powered applications which require ultra-low quiescent current. The ultra-low consumption of typ. 500 nA ensures long battery life and dynamic transient boost feature improves device transient response for wireless communication applications. The device is available in small 1 × 1 mm xDFN4, TSOP5 and SOT-563 packages.

The NCP171 is a Dual mode LDO offering up to 80 mA in ActiveMode and as low as 50 nA of Iq in Low Power Mode. The Dual Modefunction is selectable with the ECO pin allowing for dynamicswitching between Active and Low Power Modes, ideal in long lifebattery powered wireless applications.The output Voltage in Low Power mode can be lowered by aninternally factory programmed value ranging 50 mV, 100 mV, 150 mVor 200 mV with respect to the nominal output voltage in Active Mode.This feature further lowers the application consumption in sleep mode.The NCP171 is in the SLIQ (Super Low Iq) LDO family with an Ultra Low Quiescent current of 50nA and is available in small XDFN4 1.2 x 1.2 package.

The NCP176 is a Very Low Dropout Regulator which provides up to 0.5 A of load current and maintains excellent output voltage accuracy of 0.8% at 25degC. The operating input voltage range from 1.4 V up to 5.5 V makes this device suitable for Li−ion battery powered products as well as post−regulation applications. The product is available in 3.3 V fixed output voltage option and other voltage options are possible on request in range from 0.7 V to 3.6 V. NCP176 is fully protected against overheating and output short circuit.Small 6−pin XDFN6 1.2 mm x 1.2 mm package makes the device especially suitable for space constrained applications.

The NCP177 is a Very Low Dropout Regulator which provides up to 0.5 A of load current and maintains excellent output voltage accuracy of 0.8% at 25degC. The operating input voltage range from 1.6 V up to 5.5 V makes this device suitable for Li−ion battery powered products as well as post−regulation applications. The product is available in several fixed output voltage option and others are possible on request in range from 0.7 V to 3.6 V. NCP177 is fully protected against overheating and output short circuit. ENABLE function. Small 4−pin XDFN4 1.0 mm x 1.0 mm package makes the device especially suitable for space constrained applications.

NCP1835 is an integrated linear charger specifically designed to charge 1−cell Li−ion batteries with a constant current, constant voltage (CCCV) profile. It can charge at currents of up to 1.0 A. Its low input voltage capability, adjustable charge current, ability to maintain regulation without a battery, and its onboard thermal foldback make it versatile enough to charge from a variety of wall adapters. The NCP1835 can charge from a standard voltage−source wall adapter as a CCCV charger, or from a current limited adapter to limit power dissipation in the pass device.