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UC3861

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具有 16.5/10.5V UVLO、交替输出和固定关断时间、温度范围为 0°C 至 70°C 的谐振模式 PWM

产品详情

Topology Full bridge, Half bridge, Push pull Control mode Voltage Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Green mode, Light-load efficiency, Multi-topology, Soft start, Soft switching UVLO thresholds on/off (V) 16.5/10.5 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 1 Vin (max) (V) 22
Topology Full bridge, Half bridge, Push pull Control mode Voltage Duty cycle (max) (%) 50 Switching frequency (max) (kHz) 500 Features Error amplifier, Green mode, Light-load efficiency, Multi-topology, Soft start, Soft switching UVLO thresholds on/off (V) 16.5/10.5 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 1 Vin (max) (V) 22
PDIP (N) 16 181.42 mm² 19.3 x 9.4 SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Controls Zero Current Switched (ZCS) or Zero Voltage Switched (ZVS) Quasi-Resonant Converters
  • Zero-Crossing Terminated One-Shot Timer
  • Precision 1%, Soft-Started 5V Reference
  • Programmable Restart Delay Following Fault
  • Voltage-Controlled Oscillator (VCO) with Programmable Minimum and Maximum Frequencies from 10kHz to 1MHz
  • Low Start-Up Current (150µA typical)
  • Dual 1 Amp Peak FET Drivers
  • UVLO Option for Off-Line or DC/DC Applications
  • Controls Zero Current Switched (ZCS) or Zero Voltage Switched (ZVS) Quasi-Resonant Converters
  • Zero-Crossing Terminated One-Shot Timer
  • Precision 1%, Soft-Started 5V Reference
  • Programmable Restart Delay Following Fault
  • Voltage-Controlled Oscillator (VCO) with Programmable Minimum and Maximum Frequencies from 10kHz to 1MHz
  • Low Start-Up Current (150µA typical)
  • Dual 1 Amp Peak FET Drivers
  • UVLO Option for Off-Line or DC/DC Applications

The UC1861-1868 family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters. Differences between members of this device family result from the various combinations of UVLO thresholds and output options. Additionally, the one-shot pulse steering logic is configured to program either on-time for ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-1864).

The primary control blocks implemented include an error amplifier to compensate the overall system loop and to drive a voltage controlled oscillator (VCO), featuring programmable minimum and maximum frequencies. Triggered by the VCO, the one-shot generates pulses of a programmed maximum width, which can be modulated by the Zero Detection comparator. This circuit facilitates "true" zero current or voltage switching over various line, load, and temperature changes, and is also able to accommodate the resonant components' initial tolerances.

Under-Voltage Lockout is incorporated to facilitate safe starts upon power-up. The supply current during the under-voltage lockout period is typically less than 150µA, and the outputs are actively forced to the low state.

UVLO thresholds for the UC1861/62/65/66 are 16.5V (ON) and 10.5V (OFF), whereas the UC1863/64/67/68 thresholds are 8V (ON) and 7V (OFF). After VCC exceeds the UVLO threshold, a 5V generator is enabled which provides bias for the internal circuits and up to 10mA for external usage.

A Fault comparator serves to detect fault conditions and set a latch while forcing the output drivers low. The Soft-Ref pin serves three functions: providing soft start, restart delay, and the internal system reference.

Each device features dual 1 Amp peak totem pole output drivers for direct interface to power MOSFETS. The outputs are programmed to alternate in the UC1861/63/65/67 devices. The UC1862/64/66/68 outputs operate in unison alllowing a 2 Amp peak current.

The UC1861-1868 family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters. Differences between members of this device family result from the various combinations of UVLO thresholds and output options. Additionally, the one-shot pulse steering logic is configured to program either on-time for ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-1864).

The primary control blocks implemented include an error amplifier to compensate the overall system loop and to drive a voltage controlled oscillator (VCO), featuring programmable minimum and maximum frequencies. Triggered by the VCO, the one-shot generates pulses of a programmed maximum width, which can be modulated by the Zero Detection comparator. This circuit facilitates "true" zero current or voltage switching over various line, load, and temperature changes, and is also able to accommodate the resonant components' initial tolerances.

Under-Voltage Lockout is incorporated to facilitate safe starts upon power-up. The supply current during the under-voltage lockout period is typically less than 150µA, and the outputs are actively forced to the low state.

UVLO thresholds for the UC1861/62/65/66 are 16.5V (ON) and 10.5V (OFF), whereas the UC1863/64/67/68 thresholds are 8V (ON) and 7V (OFF). After VCC exceeds the UVLO threshold, a 5V generator is enabled which provides bias for the internal circuits and up to 10mA for external usage.

A Fault comparator serves to detect fault conditions and set a latch while forcing the output drivers low. The Soft-Ref pin serves three functions: providing soft start, restart delay, and the internal system reference.

Each device features dual 1 Amp peak totem pole output drivers for direct interface to power MOSFETS. The outputs are programmed to alternate in the UC1861/63/65/67 devices. The UC1862/64/66/68 outputs operate in unison alllowing a 2 Amp peak current.

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类型 标题 下载最新的英语版本 日期
* 数据表 Resonant-Mode Power Supply Controllers 数据表 (Rev. B) 2007年 9月 13日
应用手册 U-122 A New Family of Integrated Circuits Controls Resonant Mode Power 1999年 9月 5日
应用手册 U-138 Zero Voltage Switching Resonant Power Conversion 1999年 9月 5日

设计和开发

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封装 引脚 下载
PDIP (N) 16 查看选项
SOIC (DW) 16 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

支持和培训

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