UC28023中文资料经济型单端高速 PWM 控制器数据手册TI规格书

描述 Description

The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.

Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high-speed current-sense comparator, and high-current, active-high, totem-pole outputs to directly drive external MOSFETs.

Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Propagation delays through the comparators and logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.

Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.

特性 Features

• Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) Control Methods
• Practical Operation Up to 1 MHz
• 50-ns Propagation Delay to Output
• ±1.5-A Peak Totem Pole Outputs
• 9-V to 30-V Nominal Operational Voltage
• Wide Bandwidth Error Amplifier
• Fully Latched Logic With Double Pulse Suppression
• Pulse-by-Pulse Current Limiting
• Programmable Maximum Duty Cycle Control
• Undervoltage Lockout With Hysteresis
• Trimmed 5.1-V Reference With UVLO
• Same Functionality as UC3823 and UC3825

简介

UC28023属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由TI制造生产的UC28023DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。