UC1825-SP - 高速 PWM 控制器

UC1825-SP是TI德州仪器公司的一款PWM与谐振控制器产品，UC1825-SP是高速 PWM 控制器，本站介绍了UC1825-SP的封装应用图解、特点和优点、功能等，并给出了与UC1825-SP相关的TI元器件型号供参考。

UC1825-SP - 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 UC1825 PWM control device is optimized for high-frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

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.

This device features totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

产品特性

QML-V Qualified, SMD 5962-87681
Rad-Tolerant: 30 kRad (Si) TID(1)
Compatible With Voltage- or Current-Mode Topologies
Practical Operation Switching Frequencies to 1MHz
50-ns Propagation Delay-to-Output
High-Current Dual Totem Pole Outputs (1.5APeak)
Wide Bandwidth Error Amplifier
Fully Latched Logic With Double-Pulse Suppression
Pulse-by-Pulse Current Limiting
Soft Start/Maximum Duty-Cycle Control
Undervoltage Lockout With Hysteresis
Low Start-Up Current (1.1mA)

(1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details.

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