基于TL2575HV-ADJ步降电压可调节开关稳压器

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　　1 Features

　　Fixed 3.3-V, 5-V, 12-V, and 15-V Options with ±5% Regulation (Max) Over Line, Load, and Temperature Conditions

　　Adjustable Option With a Range of 1.23 V to 37 V (57 V for HV Version) and ±4% Regulation (Max) Over Line, Load, and Temperature Conditions

　　Specified 1-A Output Current

　　Wide Input Voltage Range

　　4.75 V to 40 V (60 V for HV Version)

　　Requires Only Four External Components (Fixed Versions) and Uses Readily Available Standard Inductors

　　52-kHz (Typ) Fixed-Frequency Internal Oscillator

　　TTL Shutdown Capability With 50-μA (Typ) Standby Current

　　High Efficiency

　　As High as 88% (Typ)

　　Thermal Shutdown and Current-Limit Protection with Cycle-by-Cycle Current Limiting

　　2 Applications

　　Simple High-Efficiency Step-Down (Buck) Regulators

　　Pre-Regulators for Linear Regulators

　　On-Card Switching Regulators

Positive-to-Negative Converters (Buck-Boost)

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　　3 Description

　　The TL2575 and TL2575HV devices provide all the active functions needed for a step-down (buck) switching regulator in an integrated circuit. They require four to six external components for operation. They accept a wide input-voltage range of up to 60 V (TL2575-HV) and are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, or an adjustable-output version. The TL2575 and TL2575HV devices have an integrated switch capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a manual shutdown is available via an external ON/OFF pin.