LM2575 1A 简单步降开关稳压器,可调节 | 德州仪器 TI.com.cn

LM2575 (正在供货)

1A 简单步降开关稳压器,可调节

1A 简单步降开关稳压器,可调节 - LM2575
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描述

The LM2575 device greatly simplifies the design of switching power supplies by conveniently providing all the active functions needed for a step-down (buck) switching regulator in an integrated circuit. Accepting a wide input voltage range and available in an adjustable output version, the LM2575 has 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 through an external ON/OFF pin.

The LM2575 represents a superior alternative to popular three-terminal linear regulators. Due to its high efficiency, it significantly reduces the size of the heat sink and, in many cases, no heat sink is required. Optimized for use with standard series of inductors available from several different manufacturers, the LM2575 greatly simplifies the design of switch-mode power supplies by requiring a minimal addition of only four to six external components for operation.

The LM2575 is characterized for operation over the virtual junction temperature range of –40°C to 125°C.

特性

  • Adjustable With a Range of 1.23 V to 37 V 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
  • Uses Readily Available Standard Inductors
  • 52-kHz (Typical) Fixed-Frequency Internal
    Oscillator
  • TTL Shutdown Capability With 50-µA (Typical)
    Standby Current
  • High Efficiency…as High as 88% (Typical)
  • Thermal Shutdown and Current-Limit Protection
    With Cycle-by-Cycle Current Limiting
  • For the Full Offering of Voltages (Including Fixed-
    Output Options) and Packages (Including TO-
    263), See TL2575 Data Sheet, SLVS638

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参数 与其它产品相比 降压转换器(集成开关)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Control mode
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Package size: mm2:W x L (PKG)
LM2575
4.75    
40    
1.23    
37    
1    
1    
47    
58    
5    
Enable
Over Current Protection    
Voltage Mode    
98    
-40 to 125    
Catalog    
PDIP | 16    
Converter    
See datasheet (PDIP)