• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

The UCC38083/4/5/6 is a family of BiCMOS pulse width modulation (PWM) controllers for dc-to-dc or off-line fixed-frequency current-mode switching power supplies. The dual output stages are configured for the push-pull topology. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 110 ns, limiting each output’s duty cycle to less than 50%.

The new UCC3808x family is based on the UCC3808A architecture. The major differences include the addition of a programmable slope compensation ramp to the CS signal and the removal of the error amplifier. The current flowing out of the ISET pin through an external resistor is monitored internally to set the magnitude of the slope compensation function.

特性

• Programmable Slope Compensation
• Internal Soft-Start on the UCC38083/4
• Cycle-by-Cycle Current Limiting
• Low Start-Up Current of 120 µA and 1.5 mA Typical Run Current
• Single External Component Oscillator Programmable from 50 kHz to 1 MHz
• High-Current Totem-Pole Dual Output Stage Drives Push-Pull Configuration with 1-A Sink and 0.5-A Source Capability
• Current Sense Discharge Transistor to Improve Dynamic Response
• Internally Trimmed Bandgap Reference
• Undervoltage Lockout with Hysteresis
• APPLICATIONS
  • High-Efficiency Switch-Mode Power Supplies
  • Telecom dc-to-dc Converters
  • Point-of-Load or Point-of-Use Power Modules
  • Low-Cost Push-Pull and Half-Bridge Applications