UC28025 - 经济型高速 PWM 控制器

UC28025是TI德州仪器公司的一款PWM与谐振控制器产品，UC28025是经济型高速 PWM 控制器，本站介绍了UC28025的封装应用图解、特点和优点、功能等，并给出了与UC28025相关的TI元器件型号供参考。

UC28025 - 经济型高速 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

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 include an oscillator, a temperature compensated reference, a wide band width 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 will double 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. Particular care was given to minimizing propagation delays through the comparators and logic circuitry 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 SOICW (DW), or 16-pin PDIP (N) packages.

产品特性

Peak Current Mode, Average Current Mode, or Voltage Mode (with Feed-Forward) 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 Range
Wide Bandwidth Error Amplifier
Fully Latched Logic with Double Pulse Suppression
Pulse-by-Pulse Current Limiting
Programmable Maximum Duty Cycle Control
Under-Voltage Lockout with Hysteresis
Trimmed 5.1-V Reference with UVLO
Same Functionality as UC3823 and UC3825
APPLICATIONS
- Off-Line and DC/DC Power Supplies
- Converters Using Voltage Mode, Peak Current Mode, or Average Current Mode Control Methods
- Single-Ended or Two-Switch Topology Designs

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