TL499ACPS

宽范围电源控制器 WIDE-RANGE POWER-SUPPLY CONTROLLERS

description

The TL499A is an integrated circuit designed to provide a wide range of adjustable regulated supply voltages. The regulated output voltage can be varied from 2.9 V to 30 V by adjusting two external resistors. When the TL499A is ac-coupled to line power through a step-down transformer, it operates as a series dc voltage regulator to maintain the regulated output voltage. With the addition of a battery from 1.1 V to 10 V, an inductor, a filter capacitor, and two resistors, the TL499A operates as a step-up switching regulator during an ac-line failure.

The adjustable regulated output voltage makes the TL499A useful for a wide range of applications. Providing backup power during an ac-line failure makes the TL499A extremely useful in microprocessor memory applications.

The TL499AC is characterized for operation from –20°C to 85°C.

Internal Series-Pass and Step-Up Switching Regulator

Output Adjustable From 2.9 V to 30 V

1-V to 10-V Input for Switching Regulator

4.5-V to 32-V Input for Series Regulator

Externally Controlled Switching Current

No External Rectifier Required