Power chip

The NCP1239 is a fixed frequency current mode controller with dynamic self-supply capability. This feature activates the internal start-up current source to power the controller during start-up, transients, latch-up, standby, etc., greatly simplifying the design of the auxiliary power supply and Vcc capacitor. The controller has a supply range up to 35 V, has a dithered 65 kHz or 100 kHz switching circuit, and operates under peak current mode control. When the power on the auxiliary side starts to decrease, the controller automatically folds back its switching frequency to a minimum of 26 kHz. As power drops further, the part skips cycles while limiting peak current to ensure excellent efficiency at light loads. It features timer-based fault detection to ensure overload detection and adjustable compensation to help maintain maximum power regardless of input voltage.

Power module Isolated single output; input voltage: 15VDC; output voltage: 15VDC; output current (maximum value): 66mA; output power: 1W; isolation voltage 1500VDC

TL2843 Current Mode PWM Controller

TL2843 Current Mode PWM Controller

The NCP1616 is a high-voltage PFC controller that drives a PFC boost stage based on an innovative current-controlled frequency foldback (CCFF) mode. In this mode, the circuit operates in critical conduction mode (CrM) when the inductor current exceeds a programmed value. When the current falls below this preset level, the NCP1616 will decrease the frequency linearly to a minimum of 26kHz at the sinusoidal zero crossing. CCFF maximizes energy efficiency at nominal and light loads. In particular, standby losses are minimized. Innovative circuitry achieves near-unity power factor even at reduced switching frequency. An integrated high-voltage start-up circuit requires no external start-up components and consumes very little power during normal operation. Using SOIC-9 encapsulation, the NCP1616 has the features required for a robust and compact PFC stage with few external components.

USB Li-ion battery charging chip with thermal regulation.