VS2576/LM2576数据手册.pdf资源-CSDN文库

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 Semiconductor Components Industries, LLC, 2004

June, 2004 − Rev. 5

1 Publication Order Number:

LM2576/D

LM2576

3.0 A, 15 V, Step−Down

Switching Regulator

The LM2576 series of regulators are monolithic integrated circuits

ideally suited for easy and convenient design of a step−down

switching regulator (buck converter). All circuits of this series are

capable of driving a 3.0 A load with excellent line and load regulation.

These devices are available in fixed output voltages of 3.3 V, 5.0 V,

12 V, 15 V, and an adjustable output version.

These regulators were designed to minimize the number of external

components to simplify the power supply design. Standard series of

inductors optimized for use with the LM2576 are offered by several

different inductor manufacturers.

Since the LM2576 converter is a switch−mode power supply, its

efficiency is significantly higher in comparison with popular

three−terminal linear regulators, 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 LM2576

are available from several different manufacturers. This feature

greatly simplifies the design of switch−mode power supplies.

The LM2576 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°C to 125°C). External

shutdown is included, featuring 80 A (typical) standby current. The

output switch includes cycle−by−cycle current limiting, as well as

thermal shutdown for full protection under fault conditions.

Features

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

• Adjustable Version Output Voltage Range, 1.23 to 37 V ±4%

Maximum Over Line and Load Conditions

• Guaranteed 3.0 A Output Current

• Wide Input Voltage Range

• Requires Only 4 External Components

• 52 kHz 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 (MSL) Equals 1

• Pb−Free Packages are Available*

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

See detailed ordering and shipping information in the package

dimensions section on page 24 of this data sheet.

ORDERING INFORMATION

TO−220

TV SUFFIX

CASE 314B

Heatsink surface connected to Pin 3

TO−220

T SUFFIX

CASE 314D

Pin 1. V

2. Output

3. Ground

4. Feedback

5. ON

/OFF

PAK

D2T SUFFIX

CASE 936A

Heatsink surface (shown as terminal 6 in

case outline drawing) is connected to Pin 3

See general marking information in the device marking

section on page 24 of this data sheet.

DEVICE MARKING INFORMATION

http://onsemi.com

*For additional information on our Pb−Free strategy

and soldering details, please download the

ON Semiconductor Soldering and Mounting

Techniques Reference Manual, SOLDERRM/D.

LM2576

http://onsemi.com

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 and test conditions, see the Electrical Characteristics.)

Rating

Symbol Value Unit

Operating Junction Temperature Range T

−40 to +125 °C

Supply Voltage V

40 V

SYSTEM PARAMETERS (Note 1 Test Circuit Figure 15)

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, V

= 12 V for the 3.3 V, 5.0 V, and Adjustable version, V

= 25 V

for the 12 V version, and V

= 30 V for the 15 V version. I

Load

= 500 mA. For typical values T

= 25°C, for min/max values T

is the

operating junction temperature range that applies Note 2, unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

LM2576−3.3 (Note 1 Test Circuit Figure 15)

Output Voltage (V

= 12 V, I

Load

= 0.5 A, T

= 25°C) V

out

3.234 3.3 3.366 V

Output Voltage (6.0 V ≤ V

≤ 40 V, 0.5 A ≤ I

Load

≤ 3.0 A) V

out

= 25°C 3.168 3.3 3.432

= −40 to +125°C 3.135 − 3.465

Efficiency (V

= 12 V, I

Load

= 3.0 A) η − 75 − %

LM2576−5 (Note 1 Test Circuit Figure 15)

Output Voltage (V

= 12 V, I

Load

= 0.5 A, T

= 25°C) V

out

4.9 5.0 5.1 V

Output Voltage (8.0 V ≤ V

≤ 40 V, 0.5 A ≤ I

Load

≤ 3.0 A) V

out

= 25°C 4.8 5.0 5.2

= −40 to +125°C 4.75 − 5.25

Efficiency (V

= 12 V, I

Load

= 3.0 A) η − 77 − %

LM2576−12 (Note 1 Test Circuit Figure 15)

Output Voltage (V

= 25 V, I

Load

= 0.5 A, T

= 25°C) V

out

11.76 12 12.24 V

Output Voltage (15 V ≤ V

≤ 40 V, 0.5 A ≤ I

Load

≤ 3.0 A) V

out

= 25°C 11.52 12 12.48

= −40 to +125°C 11.4 − 12.6

Efficiency (V

= 15 V, I

Load

= 3.0 A) η − 88 − %

LM2576−15 (Note 1 Test Circuit Figure 15)

Output Voltage (V

= 30 V, I

Load

= 0.5 A, T

= 25°C) V

out

14.7 15 15.3 V

Output Voltage (18 V ≤ V

≤ 40 V, 0.5 A ≤ I

Load

≤ 3.0 A) V

out

= 25°C 14.4 15 15.6

= −40 to +125°C 14.25 − 15.75

Efficiency (V

= 18 V, I

Load

= 3.0 A) η − 88 − %

LM2576 ADJUSTABLE VERSION (Note 1 Test Circuit Figure 15)

Feedback Voltage (V

= 12 V, I

Load

= 0.5 A, V

out

= 5.0 V, T

= 25°C) V

out

1.217 1.23 1.243 V

Feedback Voltage (8.0 V ≤ V

≤ 40 V, 0.5 A ≤ I

Load

≤ 3.0 A, V

out

= 5.0 V) V

out

= 25°C 1.193 1.23 1.267

= −40 to +125°C 1.18 − 1.28

Efficiency (V

= 12 V, I

Load

= 3.0 A, V

out

= 5.0 V) η − 77 − %

1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2576 is used as shown in the

Figure 15

test circuit, system performance will be as shown in system parameters section

2. Tested junction temperature range for the LM2576: T

low

= −40°C T

high

= +125°C

LM2576

http://onsemi.com

DEVICE PARAMETERS

ELECTRICAL CHARACTERISTICS (Unless otherwise specified, V

= 12 V for the 3.3 V, 5.0 V, and Adjustable version, V

= 25 V

for the 12 V version, and V

= 30 V for the 15 V version. I

Load

= 500 mA. For typical values T

= 25°C, for min/max values T

is the

operating junction temperature range that applies [Note 2], unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

ALL OUTPUT VOLTAGE VERSIONS

Feedback Bias Current (V

out

= 5.0 V Adjustable Version Only) I

= 25°C − 25 100

= −40 to +125°C − − 200

Oscillator Frequency Note 3 f

osc

kHz

= 25°C − 52 −

= 0 to +125°C 47 − 58

= −40 to +125°C 42 − 63

Saturation Voltage (I

out

= 3.0 A Note 4) V

sat

= 25°C − 1.5 1.8

= −40 to +125°C − − 2.0

Max Duty Cycle (“on”) Note 5 DC 94 98 − %

Current Limit (Peak Current Notes 3 and 4) I

= 25°C 4.2 5.8 6.9

= −40 to +125°C 3.5 − 7.5

Output Leakage Current Notes 6 and 7, T

= 25°C I

Output = 0 V − 0.8 2.0

Output = −1.0 V − 6.0 20

Quiescent Current Note 6 I

= 25°C − 5.0 9.0

= −40 to +125°C − − 11

Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) I

stby

A

= 25°C − 80 200

= −40 to +125°C − − 400

ON/OFF Pin Logic Input Level (Test Circuit Figure 15) V

out

= 0 V V

= 25°C 2.2 1.4 −

= −40 to +125°C 2.4 − −

out

= Nominal Output Voltage V

= 25°C − 1.2 1.0

= −40 to +125°C − − 0.8

ON/OFF Pin Input Current (Test Circuit Figure 15) A

ON/OFF Pin = 5.0 V (“off”), T

= 25°C I

− 15 30

ON/OFF Pin = 0 V (“on”), T

= 25°C I

− 0 5.0

3. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output

voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average dissipation of the IC by

lowering the minimum duty cycle from 5% down to approximately 2%.

4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.

5. Feedback (Pin 4) removed from output and connected to 0 V.

6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0 V versions, and +25 V for the 12 V and

15 V versions, to force the output transistor “off”.

7. V

= 40 V.

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