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UCC28500-12

更新时间： 2024-09-20 12:02:03
品牌 Logo 应用领域
德州仪器 - TI 功率因数校正控制器
页数 文件大小 规格书
35页 914K
描述
BiCMOS PFC/PWM COMBINATION CONTROLLER

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UCC28500-12 数据手册

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ꢀꢁꢁ ꢈ ꢃꢄ ꢅ ꢅ ꢆ ꢀꢁꢁ ꢈ ꢃꢄ ꢅ ꢇ ꢆ ꢀꢁꢁ ꢈ ꢃꢄ ꢅ ꢂ ꢆ ꢀꢁ ꢁꢈ ꢃꢄ ꢅꢈ  
SLUS419C − AUGUST 1999 − REVISED NOVEMBER 2001  
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used to keep input power constant with varying input  
voltage. Generation of V is accomplished using I in  
conjunction with an external single-pole filter. This not  
only reduces external parts count, but also avoids the  
use of high-voltage components, offering a lower-cost  
solution. The multiplier then divides the line current by  
FEATURES  
FF  
AC  
D
D
Combines PFC and Downstream Converter  
Controls  
Controls Boost Preregulator to Near-Unity  
Power Factor  
the square of V  
.
D
D
D
D
D
Accurate Power Limiting  
FF  
Improved Feedforward Line Regulation  
The UCC2850x PFC section incorporates a low  
offset-voltage amplifier with 7.5-V reference,  
highly-linear multiplier capable of a wide current range,  
a high-bandwidth, low offset-current amplifier, with a  
a
Peak Current-Mode Control in Second Stage  
Programmable Oscillator  
Leading-Edge/Trailing-Edge Modulation for  
Reduced Output Ripple  
novel  
noise-attenuation  
configuration,  
PWM  
comparator and latch, and a high-current output driver.  
Additional PFC features include over-voltage  
protection, zero-power detection to turn off the output  
when VAOUT is below 0.33 V and peak current and  
power limiting.  
D
Low Start-up Supply Current  
D
Synchronized Second Stage Start-Up, with  
Programmable Soft-start  
D
Programmable Second Stage Shutdown  
The dc-to-dc section relies on an error signal generated  
on the secondary-side and processes it by performing  
peak current mode control. The dc-to-dc section also  
features current limiting, a controlled soft-start, preset  
operating range with selectable options, and 50%  
maximum duty cycle.  
DESCRIPTION  
The UCC2850x family provides all of the control  
functions necessary for an active power-factor-  
corrected preregulator and a second-stage dc-to- dc  
converter. The controller achieves near-unity power  
factor by shaping the ac input line current waveform to  
correspond to the ac input-line voltage using average  
current-mode control. The dc-to-dc converter uses  
peak current-mode control to perform the step-down  
power conversion.  
The UCC28500 and UCC28502 have a wide UVLO  
threshold (16.5 V/10 V) for bootstrap bias supply  
operation. The UCC28501 and UCC28503 are  
designed with a narrow UVLO range (10.5 V/10 V) more  
suitable for fixed bias operation. The UCC28500 and  
UCC28501 have a narrow UVLO threshold for PWM  
stage (to allow operation down to 75% of nominal bulk  
voltage), while the UCC28502 and UCC38503 are  
configured for a much wider operation range for the  
PWM stage (down to 50% of bulk nominal voltage).  
The PFC stage is leading-edge modulated while the  
second stage is trailing-edge synchronized to allow for  
minimum overlap between the boost and PWM  
switches. This reduces ripple current in the bulk-output  
capacitor.In order to operate with over three-to-one  
Available in 20-pin N and DW packages.  
range of input-line voltages, a line feedforward (V ) is  
FF  
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Copyright 2001, Texas Instruments Incorporated  
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ꢠ ꢤ ꢡ ꢠꢊ ꢚꢮ ꢜꢛ ꢟ ꢧꢧ ꢥꢟ ꢝ ꢟ ꢞ ꢤ ꢠ ꢤ ꢝ ꢡ ꢩ  
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