The UCC25660x
family
is a fully featured LLC resonant controller for isolated power supplies. It incorporates
high level of integration and several design features to accommodate wide input/output
voltage operation, high power density and increased reliability of the LLC power stage.
The device's novel control scheme Input
Power Proportional Control (IPPC) offers excellent transient performance inherent in the
current mode controls, while enabling a linear relationship between input power and control
signal across wide input and output voltage variation. The IPPC control enables consistent
light load, burst mode performance operation across a wide input/output voltage
variation.
Some of the new features in UCC25660x
family are specified below:
- IPPC Control enables better burst mode
and dynamic response under wide input/output voltage operation.
- New operation modes to increase light
load efficiency while reducing audible noise.
- High-frequency (HF) pulse skip for
improved light load efficiency.
- Low-frequency (LF) burst mode for
reduced stand by power consumption.
- Programable light load / burst mode
thresholds.
- Adaptive burst mode threshold
adjustment to accommodate input voltage change.
- Up to 750kHz full-load switching
frequency enables high power density designs.
- Combined resonant current sensing with
internal control voltage generation, improves control robustness.
- Input feed forward.
- Integrated protections include:
- Fast 50ns cycle-by-cycle current
limiting.
- OCP fault to protect under short
circuit conditions.
- Over Power Protection (OPP) to limit
peak input power.
- ZCS (Zero Current Switching)
avoidance scheme to eliminate capacitive region operation.
- Adaptive soft start for reduced
inrush current and eliminating reverse recovery at startup.
- External OVP/OTP protection.
- Input & bias supply (VCCP)
UVLO.