- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：交流/直流和隔离式直流/直流开关稳压器 - PWM 控制器
- 功能描述：温度范围为 0°C 至 70°C 的频率折返电流模式 PWM 控制器
- 点击这里打开及下载UCC3884的技术文档资料
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The UCC3884 is a high performance current mode PWM controller intendedfor single ended switch mode power supplies. The chip implements a frequency foldback scheme that decreases the oscillator frequency as the output voltage falls below a programmed value. This technique decreases the average output current sourced into a low impedance load which can occur during an output short circuit or overload condition. Excessive short circuit current is more prevalent in high frequency converters where the propagation delay and switch turn-off time forces a minimum attainable duty cycle. An accurate volt-second clamp limits the duty cycle during line or load transient conditions which could otherwise saturate the transformer. The volt-second clamp may also be used with an external overvoltage protection circuit to handle fault conditions such as current sense disconnect or current transformer saturation.
The frequency foldback, volt-second clamp, cycle-by-cycle current limit, and overcurrent shutdown provide a rich set of protection features for use in peak current-mode pulse width modulators.
- Frequency Foldback Reduces Operating Frequency Under Fault Conditions
- Accurate Programmable Volt-Second Clamp
- Programmable Maximum Duty Cycle Clamp
- Oscillator Synchronization
- Overcurrent Protection
- Shutdown With Full Soft Start
- Wide Gain Bandwidth Amplifier (GBW > 2.5 MHz)
- Current Mode Operation
- Precision 5-V Reference
- Topology
- Flyback, Boost,
- Duty cycle (Max) (%)
- 78
- Supply voltage (Max) (V)
- 15
- UVLO thresholds on/off (V)
- 9.1/8.8
- Features
- Error Amplifier, Multi-topology, Soft Start, Synchronization Pin
- Operating temperature range (C)
- 0 to 70
- Rating
- Catalog
- Frequency (Max) (kHz)
- 750
- Gate drive (Typ) (A)
- 1
UCC3884的完整型号有：UCC3884D，以下是这些产品的关键参数及官网采购报价：
UCC3884D，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC3884D的批量USD价格：2.125（1000+）
UCC3884D，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC3884D的批量USD价格：2.125（1000+）
