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UC28023和UC28025是固定频率PWM控制器,针对高频开关电源应用进行了优化。 UC28023是用于单端拓扑的单输出PWM,而UC28025则为双端和全桥拓扑提供双交流输出。
针对具有最少外部元件的经济型解决方案。 UC2802x器件包括振荡器,温度补偿基准,宽带误差放大器,高速电流检测比较器和高电流,高电平有效图腾柱输出,可直接驱动外部MOSFET。
< p>保护电路包括一个具有1 V阈值的限流比较器,一个TTL兼容的关断端口,以及一个兼作最大占空比钳位的软启动引脚。逻辑完全锁存,可提供无抖动操作,并禁止输出端有多个脉冲。具有800 mV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。通过比较器和逻辑电路的传播延迟已经最小化,同时最大化误差放大器的带宽和压摆率。器件可在-40°C至105°C的工业温度范围内使用。封装产品为16引脚SOIC(DW)或16引脚PDIP(N)封装。
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 |
UC28025 | UC2825 | 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 Voltage | Current Feedforward | 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 |
45 | 80 | 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 105 | -40 to 85 | -40 to 85 | -40 to 85 |
16PDIP 16SOIC | 16PDIP 16SOIC | 16PDIP 16SOIC | 16PDIP 16SOIC |