A8447中文资料High-Voltage Step-Down Regulator数据手册Allegro规格书

描述 Description

This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: December 1, 2015.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A8498SLDTR-T.

The A8447 is a 3 A, high efficiency general-purpose buck regulator designed for a wide variety of applications. The output voltage is adjustable from 0.8 to 24 V, based on a resistor divider and the 0.8 V 3% reference. External components include an external clamping diode, inductor, and filter capacitor. The offtime is determined by an external resistor to ground. It operates in both continuous and discontinuous modes to maintain light load regulation. An internal blanking circuit is used to filter out transients due to the reverse recovery of the external clamp diode. Typical blanking time is 200 ns.

This device is ideal for various end products including applications with 8 to 50 V input voltage range and require up to 3 A output current, such as uninterruptible power supplies, point of sale (POS) applications, and industrial applications with 24 or 36 V bus.

Applications include:

Printer power supplies Office automation equipment POS thermal, laser, photo, and inkjet printers Tape drives Industrial applications

特性 Features

• Wide input voltage range: 8 to 50 V
• Integrated low RDS(on) DMOS switch
• 3 A continuous output current
• Adjustable fixed off-time
• Highly efficient
• Adjustable output: 0.8 to 24 V
• Small package with exposed thermal pad

简介

A8447属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的A8447稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。