Product Summary

The UCC3818N is a bicmos power factor preregulator. It provides all the functions necessary for active power factor corrected preregulators. The UCC3818N achieves near unity power factor by shaping the ac input line current waveform to correspond to that ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current. Designed in Bicmos process, the UCC3818N offers new features such as lower start-up current, lower power dissipation, over-voltage protection, a shunt UVLO detect circuitry, a leading-edge modulation techique to reduce ripple current in the bulk capacitor and an improved, low-offset(±2mV)current amplifier to reduce distortion at light load conditions.

Parametrics

UCC3818N absolute maximum ratings: (1)Supply voltage VCC: 18V; (2)Gate drive current, continuous: 0.2A; (3)Gate drive current, 50% duty cycle: 1A; (4)Input voltage, CAI, MOUT: 8V; (5)Input voltage, PKLMT: 5V; (6)Input voltage, VSENSE, OVP/EN: 10V; (7)Input voltage, RT, IAC, PKLMT: 10mA; (8)Maximum negative voltage, DRVOUT, PKLMT, MOUT: -0.5V; (9)Power dissipation: 1W.

Features

UCC3818N features: (1)Controls boost preregulator to near-unity power factor; (2)Limits line distortion; (3)World wide line operation; (4)Over-voltage protection; (5)Accurate power limiting; (6)Average current mode control; (7)Improved noise immunity; (8)Improved feed-forward line regulation; (9)Leading edge modulation; (10)150μA typical start-up current; (11)Low power Bicmos operation; (12)12V to 17V operation.

Diagrams

UCC3818N block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
UCC3818N
UCC3818N
Texas Instruments
Power Factor Correction ICs BiCMOS Power Factor Preregulator
Data Sheet
0-1: $2.04
1-25: $1.87
25-100: $1.49
100-250: $1.31
UCC3818NG4
UCC3818NG4
Texas Instruments
Power Factor Correction ICs BiCMOS Power Factor Preregulator
Data Sheet
0-1: $2.04
1-25: $1.72
25-100: $1.49
100-250: $1.31