具有 8.4V/7.6V UVLO 和 100% 占空比、温度范围为 -40°C 至 85°C 的 30V、0.2A 高性能 500KHz 电流模式 PWM

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产品详细信息

参数

Topology Boost, Flyback, Forward Control method Current Supply voltage (Min) (V) 0 Supply voltage (Max) (V) 30 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.6 Frequency (Max) (kHz) 500 Operating temperature range (C) -40 to 85 Gate drive (Typ) (A) 1 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology Rating Catalog open-in-new 查找其它 PWM控制器和谐振控制器

封装|引脚|尺寸

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 14 52 mm² 8.65 x 6 SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new 查找其它 PWM控制器和谐振控制器

特性

  • 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

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描述

The TL284xB and TL384xB 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 and TL384xB series are pin compatible with the standard TL284x and TL384x 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 TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B 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 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

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UC2843A 正在供货 具有 8.4V/7.6V UVLO 100% 占空比、温度范围为 40°C 至 85°C 的 30V、1A、500KHz 电流模式 PWM 控制器 Pin-to-pin equivalent alternate product

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* 数据表 High Performance Current-Mode PWM Controllers 数据表 (Rev. B) 2007年 7月 2日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

CAD/CAE 符号

封装 引脚 下载
PDIP (P) 8 了解详情
SOIC (D) 14 了解详情
SOIC (D) 8 了解详情

订购与质量

包含信息:
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/FIT 估算
  • 材料成分
  • 认证摘要
  • 持续可靠性监测

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