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參數資料
| 型號： | UCC38501DWTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.2 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, SOIC-20 |
| 文件頁數： | 1/34頁 |
| 文件大小： | 758K |
| 代理商： | UCC38501DWTR |
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UCC28500, UCC28501, UCC28502, UCC28503
UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
BiCMOS PFC/PWM
COMBINATION CONTROLLER
1
www.ti.com
FEATURES
D Combines PFC and Downstream Converter
Controls
D Controls Boost Preregulator to Near-Unity
Power Factor
D Accurate Power Limiting
D Improved Feedforward Line Regulation
D Peak Current-Mode Control in Second Stage
D Programmable Oscillator
D Leading-Edge/Trailing-Edge Modulation for
Reduced Output Ripple
D Low Start-up Supply Current
D Synchronized Second Stage Start-Up, with
Programmable Soft-start
D Programmable Second Stage Shutdown
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 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
range of input-line voltages, a line feedforward (VFF) is
used to keep input power constant with varying input
voltage. Generation of VFF is accomplished using IAC 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
the square of VFF.
The UCC2850x PFC section incorporates a low
offset-voltage
amplifier
with
7.5-V
reference,
a
highly-linear multiplier capable of a wide current range,
a high-bandwidth, low offset-current amplifier, with a
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.
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.
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).
Available in 20-pin N and DW packages.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
2001, Texas Instruments Incorporated
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UCC38501DWTRG4 | 功能描述:功率因數校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC38501N | 功能描述:功率因數校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC38501NG4 | 功能描述:功率因數校正 IC BiCMOS PFC/PWM Combo Cntrlr RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC38502 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BICMOS PFC/PWM COMBINATION CONTROLLER |
| UCC38502DW | 功能描述:功率因數校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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