UC2825 高速 PWM 控制器

描述

UC1825系列PWM控制IC针对高频开关模式电源应用进行了优化。特别注意通过比较器和逻辑电路最小化传播延迟，同时最大化误差放大器的带宽和转换速率。该控制器设计用于电流模式或电压模式系统，具有输入电压前馈功能。

保护电路包括一个具有1V阈值的限流比较器，一个TTL兼容的关断端口，和一个软启动引脚，它将作为最大占空比钳位加倍。逻辑完全锁存以提供无抖动操作并禁止输出端出现多个脉冲。具有800mV迟滞的欠压锁定部分可确保较低的启动电流。在欠压锁定期间，输出为高阻抗。

这些器件具有图腾柱输出，旨在从容性负载（如功率MOSFET的栅极）提供和吸收高峰值电流。开启状态设计为高级别。


Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package

UC2825	UC28025	UC2825A	UC2825B
Boost Flyback Forward Full-Bridge Half-Bridge Push-Pull	Boost Flyback Forward Full-Bridge Half-Bridge Push-Pull	Boost Flyback Forward Full-Bridge Half-Bridge Push-Pull	Boost Flyback Forward Full-Bridge Half-Bridge Push-Pull
Current Feedforward	Current Feedforward Voltage	Current Voltage	Current Voltage
9.2	9.2	9.2	16
30	30	22	22
1000	1000	1000	1000
9.2/8.4	9.2/8.4	9.2/8.4	16/10
80	45	50	50
1.5	1.5	2	2
Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Programmable Max Duty Cycle Soft Start Synchronization Pin	Adjustable Switching Frequency Current Limiting Error Amplifier Multi-topology Programmable Max Duty Cycle Soft Start Synchronization Pin	Adjustable Switching Frequency Current Limiting Dead Time Control Error Amplifier Leading Edge Blanking Multi-topology Programmable Max Duty Cycle Soft Start Synchronization Pin	Adjustable Switching Frequency Current Limiting Dead Time Control Error Amplifier Leading Edge Blanking Multi-topology Programmable Max Duty Cycle Soft Start Synchronization Pin
Catalog	Catalog	Catalog	Catalog
-40 to 85	-40 to 105	-40 to 85	-40 to 85
16PDIP 16SOIC	16PDIP 16SOIC	16PDIP 16SOIC	16PDIP 16SOIC

数据手册（1）

元器件购买 UC2825 相关库存