UCC2818-EP Texas instruments

UCC2818-EP

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UCC2818-EP

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Описание

The UCC2817 and UCC2818 provides all the functions necessary for active power-factor-corrected preregulators. The controller achieves near-unity power factor by shaping the ac-input line current waveform to correspond to that of the ac input line voltage. Average current mode control maintains stable, low-distortion sinusoidal line current. Designed with TIs BiCMOS process, the UCC2817 and UCC2818 offers new features, such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor, and an improved, low-offset (±2-mV) current amplifier to reduce distortion at light load conditions. The UCC2817 offers an on-chip shunt regulator with low start-up current suitable for applications utilizing a bootstrap supply. The UCC2818 is intended for applications with a fixed supply (VCC). The devices are available in a 16-pin D package.

Controls Boost Preregulator to Near-Unity Power Factor
Limits Line Distortion
World-Wide Line Operation
Overvoltage Protection
Accurate Power Limiting
Average Current Mode Control
Improved Noise Immunity
Improved Feed-Forward Line Regulation
Leading Edge Modulation
150-µA Typical Start-Up Current
Low-Power BiCMOS Operation
12-V to 17-V Operation
SUPPORTS DEFENSE, AEROSPACE, AND MEDICAL APPLICATIONS
- Controlled Baseline
- One Assembly/Test Site
- One Fabrication Site
- Available in Military (–55°C/125°C) Temperature Range⁽¹⁾
- Extended Product Life Cycle
- Extended Product-Change Notification
- Product Traceability

⁽¹⁾ Additional temperature ranges are available - contact factory
Unitrode Is a trademark of Texas Instruments.

Topology	Boost
Control mode	CCM
Switching frequency (max) (kHz)	250
UVLO thresholds on/off (V)	10.5/10
Vin (max) (V)	18
Features	750W Applications, Average current mode, Continuous Control Mode, Enable, OVP
Rating	HiRel Enhanced Product
Operating temperature range (°C)	-55 to 125
Duty cycle (max) (%)	100