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TL2843B-Q1

更新时间： 2024-11-24 11:58:15
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德州仪器 - TI 控制器
页数 文件大小 规格书
16页 284K
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HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER

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TL2843B-Q1 数据手册

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TL2843B-Q1  
www.ti.com  
SLVSAE2A –JULY 2010–REVISED FEBRUARY 2012  
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER  
Check for Samples: TL2843B-Q1  
1
FEATURES  
•
•
•
•
•
•
Qualified for Automotive Applications  
Low Start-Up Current (<0.5 mA)  
Trimmed Oscillator Discharge Current  
Current Mode Operation to 500 kHz  
Automatic Feed-Forward Compensation  
Latching PWM for Cycle-by-Cycle Current  
Limiting  
•
•
•
Internally Trimmed Reference With  
Undervoltage Lockout  
High-Current Totem-Pole Output Undervoltage  
Lockout With Hysteresis  
Double-Pulse Suppression  
DESCRIPTION  
The TL284xB series of control integrated circuits provide the features that are necessary to implement off-line or  
dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components.  
Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed  
for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a  
pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage  
designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low  
when it is in the off state.  
The TL284xB series are pin compatible with the standard TL284x with the following improvements. The start-up  
current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In  
addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while  
sinking 10 mA (VCC = 5 V).  
Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges.  
Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TL2842B and TL2844B devices make them ideally  
suited to off-line applications. The corresponding typical thresholds for the TL2843B and TL2845B devices are  
8.4 V (on) and 7.6 V (off). The TL2842B and TL2843B devices can operate to duty cycles approaching 100%. A  
duty-cycle range of 0% to 50% is obtained by the TL2844B and TL2845B by the addition of an internal toggle  
flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for  
operation from –40°C to 125°C.  
Table 1. ORDERING INFORMATION(1)  
TA  
PACKAGE(2)  
ORDERABLE PART NUMBER  
TL2842BQDRQ1  
TOP-SIDE MARKING  
Product Preview  
TL2843BQ  
TL2843BQDRQ1  
–40°C to 125°C  
SOIC – D  
Reel of 2500  
TL2844BQDRQ1  
Product Preview  
Product Preview  
TL2845BQDRQ1  
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI  
web site at www.ti.com.  
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.  
1
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.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2010–2012, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
 
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