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奥伟斯科技为您提供开关稳压集成电路 LM2575S-5.0应用参考设计方案 ? 内容导航：

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FEATURES

3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions

Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4% AG10 Maximum Over Line and Load Conditions Guaranteed 1A Output Current

1

Wide Input Voltage Range

Requires Only 4 External Components 52kHz Fixed Frequency Internal Oscillator

TTL Shutdown Capability, Low Power Standby Mode

High Efficiency

Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection

Moisture Sensitivity Level 3

Applications

Simple High-Efficiency Step-Down(Buck) Regulator

Efficient Pre-Regulator for Linear Regulators

On-Card Switching Regulators

Positive to Negative Converter(Buck-Boost)

Negative Step-Up Converters

Power Supply for Battery Chargers

DESCRIPTION

The LM2575 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regualtor(buck converter).

All circuits of this series are capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, 15V, and an adjustable output version.

ORDERING INFORMATION Device LM2575T-X.X LM2575TV-X.X LM2575R Marking LM2575T-X.X LM2575T-X.X LM2575R-X.X Package TO-220 TO-220V TO-263 These regulatiors were designed to minimize the number of externalcomponents to simplify the power supply design. Standard series of inductors optimized for use with the LM2575 are offered by several different inductor manufacturers.

Since the LM2575 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2575 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2575 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-10% on the oscillator frequency (+/- 2% over 0℃ to 125 ℃).

External shutdown is included, featuring 80 ? (typical) standby current. The output switch includes cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.

ABSOLUTE MAXIMUM RATINGS

(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur) Rating Maximum Supply Voltage On/Off Pin Input Voltage Output Voltage to Ground (Steady-State) Power Dissipation TO-220 5Lead Thermal Resistance, Juntion to Ambient Thermal Resistance, Juntion to Case TO-263 5Lead Thermal Resistance, Juntion to Ambient Thermal Resistance, Juntion to Case Storage Temperature Range Minimum ESD Rating(Human Body Model : C=100 pF, R=1.5?) Lead Temperature (Soldering,10seconds) Maximum Junction Temperature Symbol Vin - - Value 45 -0.3V ≤ V ≤ +Vin - 1.0 Unit V V V PD PθJA PθJC PD PθJA PθJC Tstg - - TJ Internally Limited 65 5.0 Internally Limited 70 5.0 -60 to +150 2.0 260 150 W ℃/W ℃/W W ℃/W ℃/W ℃ kV ℃ ℃

OPERATING RATINGS(Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see the Electrical Characteristics.) Rating Symbol Value Unit TJ Operating Junction Temperature Range -40 to +125 ℃ Supply Voltage Vin 40 V Characteristics LM2575-3.3V ([Note 1] Test Circuit Figure 2) Output Voltage (Vin = 12V, ILOAD=0.5A, TJ=25℃) Output Voltage (6.0V≤Vin≤40V, 0.5A≤ILOAD≤1A TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (Vin=12V, ILOAD=1A) Symbol Min TYP Max Unit Vout 3.234 3.3 3.366 V Vout η 3.168 3.135 - 3.3 - 75 3.432 3.465 - V % LM2575-5.0V ([Note 1] Test Circuit Figure 2) Output Voltage (Vin = 12V, ILOAD=0.5A, TJ=25℃) Output Voltage (8.0V≤Vin≤40V, 0.5A≤ILOAD≤1A TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (Vin=12V, ILOAD=1A) Vout 4.9 5.0 5.1 V Vout η 4.8 4.75 - 5.0 - 77 5.2 5.25 - V % LM2575-12V ([Note 1] Test Circuit Figure 2) Output Voltage (Vin = 25V, ILOAD=0.5A, TJ=25℃) Output Voltage (15V≤Vin≤40V, 0.5A≤ILOAD≤1A TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (Vin=12V, ILOAD=1A) Vout 11.76 12 12.24 V Vout η 11.52 11.4 - 12 - 88 12.48 12.6 - V % LM2575-ADJ ([Note 1] Test Circuit Figure 2) Feedback Voltage (Vin=12V, ILOAD=0.5A, TJ=25℃) Feedback Voltage(8.0V≤Vin≤40V, 0.5A≤ILOAD≤1A, Vout=5.0V) Vout 1.217 1.23 1.243 V Vout η 1.193 1.18 - 1.23 - 77 1.267 1.28 - V % TJ=25℃ TJ= -40℃ ~ +125℃ Efficiency (Vin=12V, ILOAD=1A, Vout=5.0V)