主页 电源管理 交流/直流和隔离式直流/直流开关稳压器 PWM 控制器

UCC3960

正在供货

温度范围为 0°C 至 70°C 的初级侧启动控制器

产品详情

Topology Boost, Flyback Control mode Current Duty cycle (max) (%) 72 Switching frequency (max) (kHz) 400 UVLO thresholds on/off (V) 10/8 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 1.5 Vin (max) (V) 19
Topology Boost, Flyback Control mode Current Duty cycle (max) (%) 72 Switching frequency (max) (kHz) 400 UVLO thresholds on/off (V) 10/8 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 1.5 Vin (max) (V) 19
SOIC (D) 8 29.4 mm² 4.9 x 6
  • Operates With Secondary-Side PWM Control
  • Receives Isolated PWM Command Through a Pulse-Edge-Transformer
  • Initial Free-Running Soft-Start Up with Duty-Cycle Clamping
  • Up to 400-kHz Synchronizable Switching Frequency
  • High-Current FET Drive (1.5-A Sink, 0.75-A Source)
  • Overcurrent Protection
  • Undervoltage Lockout with 2-V Hysteresis
  • Low-Current Startup typical operating circuit
  • Operates With Secondary-Side PWM Control
  • Receives Isolated PWM Command Through a Pulse-Edge-Transformer
  • Initial Free-Running Soft-Start Up with Duty-Cycle Clamping
  • Up to 400-kHz Synchronizable Switching Frequency
  • High-Current FET Drive (1.5-A Sink, 0.75-A Source)
  • Overcurrent Protection
  • Undervoltage Lockout with 2-V Hysteresis
  • Low-Current Startup typical operating circuit

The UCC3960 primary-side startup controller is a unique solution that provides all the primary-side functions required for a single-ended, isolated offline, switch-mode power converter that uses secondary-side PWM control. It is usable with a wide range of secondary circuits and is especially well suitable for systems where sophisticated handling of overload conditions is required.

Secondary-side control assumes that output voltage and current measurements are interfaced directly to an output ground-referenced PWM stage that develops the power switch command for the supply. This digital PWM command can then be transmitted to the primary-side power switch through a simple and low-cost isolating pulse transformer. With secondary-side control, it is much easier to monitor and control the system load with tightly coupled analog control loops. Load-oriented features such as output current sharing and synchronous rectification are implemented more easily.

The UCC3960 provides all the circuitry required on the primary side of a secondary-side controlled power supply. It features a free running 60-kHz to 360-kHz oscillator that is synchronizable to the secondary-side PWM signal and also has the ability to accept start/stop PWM commands from the isolating pulse edge transformer. The use of an extremely small and low-cost pulse transformer allows for higher converter bandwidth. This also eliminates the loop-gain variations due to initial accuracy and aging of an opto-coupler feedback element or the size penalty of a gate transformer. It also includes an undervoltage lockout circuit with 2-V hysteresis, a low current startup with active low during UVLO, a soft-start capability, a 5-V reference and a high current power output.

In a non-typical use, the UCC3960 can accommodate an analog feedback signal through an opto-isolator where it can operate in voltage-mode control mode with primary-side peak current limiting.

The UCC3960 and the UCC2960 are available in the 8-pin SOIC (D) and PDIP (P) packages. A 14-pin package version is available as UCC2961 and UCC3961 that includes additional protection features such as multimode overcurrent protection, volt-second clamp, programmable overvoltage and undervoltage sense lines, and the self-bias regulator.

The UCC3960 primary-side startup controller is a unique solution that provides all the primary-side functions required for a single-ended, isolated offline, switch-mode power converter that uses secondary-side PWM control. It is usable with a wide range of secondary circuits and is especially well suitable for systems where sophisticated handling of overload conditions is required.

Secondary-side control assumes that output voltage and current measurements are interfaced directly to an output ground-referenced PWM stage that develops the power switch command for the supply. This digital PWM command can then be transmitted to the primary-side power switch through a simple and low-cost isolating pulse transformer. With secondary-side control, it is much easier to monitor and control the system load with tightly coupled analog control loops. Load-oriented features such as output current sharing and synchronous rectification are implemented more easily.

The UCC3960 provides all the circuitry required on the primary side of a secondary-side controlled power supply. It features a free running 60-kHz to 360-kHz oscillator that is synchronizable to the secondary-side PWM signal and also has the ability to accept start/stop PWM commands from the isolating pulse edge transformer. The use of an extremely small and low-cost pulse transformer allows for higher converter bandwidth. This also eliminates the loop-gain variations due to initial accuracy and aging of an opto-coupler feedback element or the size penalty of a gate transformer. It also includes an undervoltage lockout circuit with 2-V hysteresis, a low current startup with active low during UVLO, a soft-start capability, a 5-V reference and a high current power output.

In a non-typical use, the UCC3960 can accommodate an analog feedback signal through an opto-isolator where it can operate in voltage-mode control mode with primary-side peak current limiting.

The UCC3960 and the UCC2960 are available in the 8-pin SOIC (D) and PDIP (P) packages. A 14-pin package version is available as UCC2961 and UCC3961 that includes additional protection features such as multimode overcurrent protection, volt-second clamp, programmable overvoltage and undervoltage sense lines, and the self-bias regulator.

下载 观看带字幕的视频 视频

您可能感兴趣的相似产品

open-in-new 比较替代产品
功能与比较器件相似
UCC28C53 正在供货 工业类 30V 低功耗电流模式 PWM 控制器,8.4V/7.6V UVLO,100% 占空比 Supports Buck, Boost, Flyback topologies

技术文档

star =有关此产品的 TI 精选热门文档
未找到结果。请清除搜索并重试。
查看全部 1
类型 标题 下载最新的英语版本 日期
* 数据表 Primary-Side Startup Controller 数据表 (Rev. A) 2000年 12月 18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
SOIC (D) 8 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

视频