UC3524A中文资料占空比为 45%、温度范围为 0°C 至 70°C 的高级 40V VCC、双端 300KHz 电压模式 PWM 控制器数据手册TI规格书

描述 Description

The UC1524A family of regulating PWM ICs has been designed to retain the same highly versatile architecture of the industry standard UC1524 (SG1524) while offering substantial improvements to many of its limitations. The UC1524A is pin compatible with \"non-A\" models and in most existing applications can be directly interchanged with no effect on power supply performance. Using the UC1524A, however, frees the designer from many concerns which typically had required additional circuitry to solve. The UC1524A includes a precise 5V reference trimmed to ±1% accuracy, eliminating the need for potentiometer adjustments; an error amplifier with an input range which includes 5V, eliminating the need for a reference divider; a current sense amplifier useful in either the ground or power supply output lines; and a pair of 60V, 200mA uncommitted transistor switches which greatly enhance output versatility. An additional feature of the UC1524A is an under-voltage lockout circuit which disables all the internal circuitry, except the reference, until the input voltage has risen to 8V. This holds standby current low until turn-on, greatly simplifying the design of low power, off-line supplies. The turn-on circuit has approximately 600mV of hysteresis for jitter-free activation. Other product enhancements included in the UC1524A’s design include a PWM latch which insures freedom from multiple pulsing within a period, even in noisy environments, logic to eliminate double pulsing on a single output, a 200ns external shutdown capability, and automatic thermal protection from excessive chip temperature. The oscillator circuit of the UC1524A is usable beyond 500kHz and is now easier to synchronize with an external clock pulse. The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation from -55°C to +125°C. The UC2524A and 3524A are available in either ceramic or plastic packages and are rated for operation from -25°C to +85°C and 0°C to 70°C, respectively. Surface mount devices are also available.

特性 Features

• Fully Interchangeable with Standard UC1524 Family
• Precision Reference Internally Trimmed to ±1%
• High-Performance Current Limit Function
• Under-Voltage Lockout with Hysteretic Turn-on
• Start-Up Supply Current Less Than 4mA
• Output Current to 200mA
• 60V Output Capability
• Wide Common-Mode Input Range for both Error and Current Limit Amplifiers
• PWM Latch Insures Single Pulse per Period
• Double Pulse Suppression Logic
• 200ns Shutdown through PWM Latch
• Guaranteed Frequency Accuracy
• Thermal Shutdown Protection

简介

UC3524A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UC3524ADC-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。