TL3843BDR-8

厂商：
BURR-BROWN(德州仪器)
封装：
SOIC-8
描述：
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS SOIC8_150MIL 0~5.5V

数据手册：

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详情介绍
数据手册
价格&库存

TL3843BDR-8 数据手册

TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com FEATURES • • • • • • • • Low Start-Up Current ( 5 kΩ: f ≈ 1.72 / RTCT VREF RT RT/CT CT GND Figure 3. Oscillator Section Submit Documentation Feedback 11 TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B – AUGUST 2006 – REVISED JULY 2007 APPLICATION INFORMATION (continued) TIMING RESISTANCE vs FREQUENCY DEAD TIME vs TIMING CAPACITANCE 100 100 CT = 10 nF VCC = 15 V RT ≥ 5 kΩ TA = 25°C 40 CT = 4.7 nF CT = 2.2 nF R T − Timing Resistance − k Ω Dead Time − µ s 40 10 4 1 CT = 1 nF CT = 22 nF 10 CT = 47 nF CT = 100 nF 4 0.4 VCC = 15 V TA = 25°C 1 100 0.1 1 4 10 40 100 1k 10k 100k 1M f − Frequency − Hz CT − Timing Capacitance − nF Open-Loop Laboratory Test Fixture In the open-loop laboratory test fixture (see Figure 4), high peak currents associated with loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to the GND terminal in a single-point ground. The transistor and 5-kΩ potentiometer sample the oscillator waveform and apply an adjustable ramp to the ISENSE terminal. REF RT A 4.7 kΩ VCC 2N2222 100 kΩ 1-kΩ Error Amplifier Adjust VFB 5 kΩ VREF COMP TL284xB TL384xB 0.1 µF VCC 0.1 µF ISENSE OUTPUT 1 kΩ, 1 W OUTPUT 4.7 kΩ ISENSE Adjust RT/CT GND GND CT Figure 4. Open-Loop Laboratory Test Fixture 12 Submit Documentation Feedback TL284xB, TL384xB HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B – AUGUST 2006 – REVISED JULY 2007 APPLICATION INFORMATION (continued) Shutdown Technique The PWM controller (see Figure 5) can be shut down by two methods: either raise the voltage at ISENSE above 1 V or pull the COMP terminal below a voltage two diode drops above ground. Either method causes the output of the PWM comparator to be high (refer to block diagram). The PWM latch is reset dominant so that the output remains low until the next clock cycle after the shutdown condition at the COMP or ISENSE terminal is removed. In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling VCC below the lower UVLO threshold. At this point, the reference turns off, allowing the SCR to reset. 1 kΩ VREF COMP Shutdown 330 Ω ISENSE 500 Ω Shutdown To Current-Sense Resistor Figure 5. Shutdown Techniques A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope compensation for converters requiring duty cycles over 50% (see Figure 6). Note that capacitor C forms a filter with R2 to suppress the leading-edge switch spikes. VREF 0.1 µF RT RT/CT CT R1 ISENSE R2 ISENSE C RSENSE Figure 6. Slope Compensation Submit Documentation Feedback 13 PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) TL2842BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2842B TL2842BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2842B TL2842BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2842B TL2842BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2842B TL2842BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type -40 to 85 TL2842BP TL2843BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2843B TL2843BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2843B TL2843BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2843B TL2843BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2843B TL2843BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2843B TL2843BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type -40 to 85 TL2843BP TL2844BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2844B TL2844BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2844B TL2844BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2844B TL2844BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2844B TL2845BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2845B TL2845BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2845B Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) TL2845BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 TL2845B TL2845BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2845B TL2845BDRG4-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM -40 to 85 2845B TL3842BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3842B TL3842BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3842B TL3842BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3842B TL3842BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3842B TL3842BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type 0 to 70 TL3842BP TL3843BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B TL3843BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3843B TL3843BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B TL3843BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3843B TL3843BDRG4 ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3843B TL3843BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type 0 to 70 TL3843BP TL3844BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3844B TL3844BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3844B TL3844BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3844B TL3844BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type 0 to 70 TL3844BP Addendum-Page 2 Samples PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) TL3845BD ACTIVE SOIC D 14 50 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3845B TL3845BD-8 ACTIVE SOIC D 8 75 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3845B TL3845BDR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 TL3845B TL3845BDR-8 ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) NIPDAU Level-1-260C-UNLIM 0 to 70 3845B TL3845BP ACTIVE PDIP P 8 50 Green (RoHS & no Sb/Br) NIPDAU N / A for Pkg Type 0 to 70 TL3845BP (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of

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TL3843BDR-8

物料型号： - TL284xB系列 - TL384xB系列

器件简介：这些集成电路提供了实现离线或直流到直流固定频率电流模式控制方案所需的特性，并且外部组件数量最少。内部实现的电路包括欠压锁定(UVLO)和精确参考源，该参考源在误差放大器输入端进行了精确修整。

引脚分配： - 8引脚和14引脚的D (SOIC)和P (PDIP)封装，具体引脚功能包括VCC、VREF、OUTPUT、COMP、ISENSE、VFB、RT/CT、GND等。

参数特性： - 低启动电流(<0.5 mA) - 可调节的振荡器放电电流 - 可达到500 kHz的电流模式操作 - 自动前馈补偿 - 用于周期电流限制的锁定PWM - 内部修整的参考源带有欠压锁定 - 高电流图腾柱输出带有电压锁定的迟滞

功能详解： - 包括误差放大器、电流检测比较器、振荡器、PWM锁存器、输出级等部分，具有短路保护、双脉冲抑制等功能。

应用信息： - 提供了错误放大器配置、电流检测电路、振荡器频率设置、定时电阻与频率、死区时间与定时电容的关系等应用信息。

封装信息： - 提供了SOIC和PDIP两种封装类型，包括引脚数量、封装图纸、样品标记等信息。

注意事项： - 重要通知和免责声明：TI提供技术和可靠性数据、设计资源、应用程序或其他设计建议、网络工具、安全信息等资源“按原样”提供，并带有所有缺陷，并且不提供任何明示或暗示的保证。

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