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TL3845DG4 PDF预览

TL3845DG4

更新时间： 2024-11-24 07:04:35
品牌 Logo 应用领域
德州仪器 - TI 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
21页 577K
描述
CURRENT-MODE PWM CONTROLLERS

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TL3845DG4 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP, SOP14,.25针数：14
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.73
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：30 V
最小输入电压：8.2 V标称输入电压：15 V
JESD-30 代码：R-PDSO-G14JESD-609代码：e4
长度：8.65 mm湿度敏感等级：1
功能数量：1端子数量：14
最高工作温度：70 °C最低工作温度：
最大输出电流：1 A封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP14,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：500 kHz温度等级：COMMERCIAL
端子面层：Nickel/Palladium/Gold (Ni/Pd/Au)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3.9 mm
Base Number Matches：1

TL3845DG4 数据手册

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TL284x, TL384x  
CURRENT-MODE PWM CONTROLLERS  
SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008  
D PACKAGE  
(TOP VIEW)  
D
Optimized for Off-Line and dc-to-dc  
Converters  
D
D
D
D
D
D
D
D
D
D
Low Start-Up Current (<1 mA)  
COMP  
NC  
VFB  
NC  
ISENSE  
NC  
REF  
13 NC  
1
2
3
4
5
6
7
14  
Automatic Feed-Forward Compensation  
Pulse-by-Pulse Current Limiting  
Enhanced Load-Response Characteristics  
Undervoltage Lockout With Hysteresis  
Double-Pulse Suppression  
12  
11  
10  
9
VCC  
VC  
OUTPUT  
GND  
8
POWER GROUND  
RT/CT  
High-Current Totem-Pole Output  
Internally Trimmed Bandgap Reference  
500-kHz Operation  
NC − No internal connection  
D-8 OR P PACKAGE  
(TOP VIEW)  
Error Amplifier With Low Output  
Resistance  
COMP  
VFB  
ISENSE  
RT/CT  
REF  
VCC  
OUTPUT  
GND  
1
2
3
4
8
7
6
5
D
Designed to Be Interchangeable With  
UC2842 and UC3842 Series  
description/ordering information  
The TL284x and TL384x 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. Some of the internally implemented circuits are an undervoltage lockout (UVLO),  
featuring a start-up current of less than 1 mA, and a precision reference 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.  
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 TLx842 and TLx844 devices make them ideally suited  
to off-line applications. The corresponding typical thresholds for the TLx843 and TLx845 devices are 8.4 V (on)  
and 7.6 V (off). The TLx842 and TLx843 devices can operate to duty cycles approaching 100%. A duty-cycle  
range of 0 to 50% is obtained by the TLx844 and TLx845 by the addition of an internal toggle flip-flop, which  
blanks the output off every other clock cycle.  
The TL284x-series devices are characterized for operation from −40°C to 85°C. The TL384x devices are  
characterized for operation from 0°C to 70°C.  
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.  
Copyright 2008, Texas Instruments Incorporated  
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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...21

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