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UCC2808A-1EP

更新时间： 2024-11-27 22:38:43
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
10页 180K
描述
LOW POWER CURRENT MODE PUSH-PULL PWM

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UCC2808A-1EP 数据手册

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SGLS187A − SEPTEMBER 2003 − REVISED SEPTEMBER 2003  
D
Controlled Baseline  
− One Assembly/Test Site, One Fabrication  
Site  
D
130-µA Typical Starting Current  
1-mA Typical Run Current  
Operation to 1 MHz  
D
D
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Extended Temperature Performance of  
−40°C to 125°C  
Enhanced Diminishing Manufacturing  
Sources (DMS) Support  
Internal Soft Start  
On-Chip Error Amplifier With 2-MHz Gain  
Bandwidth Product  
D
On Chip VDD Clamping  
Enhanced Product-Change Notification  
D
Output Drive Stages Capable of 500-mA  
Peak-Source Current, 1-A Peak-Sink  
Current  
†
Qualification Pedigree  
Dual Output Drive Stages in Push-Pull  
Configuration  
D PACKAGE  
(TOP VIEW)  
D
Current Sense Discharge Transistor to  
Improve Dynamic Response  
†
Component qualification in accordance with JEDEC and industry  
standards to ensure reliable operation over an extended  
temperature range. This includes, but is not limited to, Highly  
Accelerated Stress Test (HAST) or biased 85/85, temperature  
cycle, autoclave or unbiased HAST, electromigration, bond  
intermetallic life, and mold compound life. Such qualification  
testing should not be viewed as justifying use of this component  
beyond specified performance and environmental limits.  
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VDD  
COMP  
FB  
OUTA  
OUTB  
GND  
CS  
RC  
description/ordering information  
The UCC2808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The  
UCC2808A contains all of the control and drive circuitry required for off-line or dc-to-dc fixed frequency  
current-mode switching power supplies with minimal external parts count.  
The UCC2808A dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half  
the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to  
200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle  
to less than 50%.  
The UCC2808A family offers a variety of package options and choice of undervoltage lockout levels. The family  
has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are shown  
in the ordering information table.  
The UCC2808A is an enhanced version of the UCC2808 family. The significant difference is that the A versions  
feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle during  
the oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle and helps  
minimize filter capacitor values and current sense delay.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
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Copyright 2003, Texas Instruments Incorporated  
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ꢞ ꢢ ꢟ ꢞꢗ ꢘꢬ ꢚꢙ ꢝ ꢥꢥ ꢣꢝ ꢛ ꢝ ꢜ ꢢ ꢞ ꢢ ꢛ ꢟ ꢧ  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...10

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