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UC1856

正在供货

改进的电流模式 PWM 控制器

产品详情

Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/7 Operating temperature range (°C) -55 to 125 Rating Military Gate drive (typ) (A) 1.5 Vin (max) (V) 40
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 1000 Features Error amplifier, Multi-topology, Soft start, Synchronization pin UVLO thresholds on/off (V) 7.7/7 Operating temperature range (°C) -55 to 125 Rating Military Gate drive (typ) (A) 1.5 Vin (max) (V) 40
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • Pin-for-Pin Compatible With the UC3846
  • 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
  • Improved Current Sense Amplifier With Reduced Noise Sensitivity
  • Differential Current Sense with 3V Common Mode Range
  • Trimmed Oscillator Discharge Current for Accurate Deadband Control
  • Accurate 1V Shutdown Threshold
  • High Current Dual Totem Pole Outputs (1.5A peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • 4kV ESD Protection
  • Pin-for-Pin Compatible With the UC3846
  • 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
  • Improved Current Sense Amplifier With Reduced Noise Sensitivity
  • Differential Current Sense with 3V Common Mode Range
  • Trimmed Oscillator Discharge Current for Accurate Deadband Control
  • Accurate 1V Shutdown Threshold
  • High Current Dual Totem Pole Outputs (1.5A peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • 4kV ESD Protection

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.

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类型 标题 下载最新的英语版本 日期
* 数据表 Improved Current Mode PWM Controller 数据表 (Rev. A) 2010年 10月 7日
* SMD UC1856 SMD 5962-94530 2016年 6月 21日
应用手册 DN-62 开关电源拓扑电压模式与 电流模式 英语版 2010年 7月 28日
应用手册 DN-45 UC3846, UC3856 and UCC3806 Push Pull PWM Current Mode Control ICs 1999年 9月 5日

设计和开发

如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。

封装 引脚 下载
CDIP (J) 16 查看选项
LCCC (FK) 20 查看选项

订购和质量

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/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息:
  • 制造厂地点
  • 封装厂地点

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