LM2575-5.0BN 데이터 시트보기 (PDF) - Micrel

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LM2575-5.0BN

52kHz Simple 1A Buck Regulator

Micrel 

LM2575

Typical Performance Characteristics (Circuit of Figure 1)

Micrel, Inc.

Load Transient Response

Switching Waveforms

+100mV

Output

Voltage

0

Change

–100mV

Output

Current

1.0A

0.5A

0

VOUT = 5V

100µS/div.

Test Circuits and Layout Guidelines

A 10V

0

B 1A

0

1A

C

.5A

0

D

VOUT = 5V VIN = 20V

A: Output pin voltage 10V/div

B: Output pin current 1A/div

C: Inductor current 0.5A/div

D: Output ripple voltage 20 mV/div. AC coupled

Horizontal Time Base: 5µs/div

FEEDBACK

+VIN

4

LM2575

L1

1

OUTPUT

7V - 40V

UNREGULATED

+

100 µF GND 3

ON/OFF 5

2

DC INPUT

C IN

330 µH

D1

MBR360

+C OUT

470µF

VOUT

5.00V

R2 L

O

A

R1 D

CIN — 100µF, 75V Aluminum Electrolytic

COUT — 470µF, 15V Aluminum Electrolytic

D1 — Schottky, MBR360

L1 — 330µH, 415-0926 (AIE)

R1 — 1k, 0.01%

R2 — 3.065k, 0.01%

5-pin TO-220 socket—2936 (Loranger Mfg. Co.)

4-pin TO-3 socket—8112-AG7 (Augat Inc.)

FEEDBACK

+VIN

4

LM2575-5.0

L1

1

OUTPUT

7V - 40V

UNREGULATED

+

100 µF GND 3

ON/OFF 5

2

DC INPUT

C IN

330 µH

D1

MBR360

VOUT

5.00V

+C OUT

L

220µF

O

A

D

CIN — 100µF, 75V Aluminum Electrolytic

COUT — 330µF, 15V Aluminum Electrolytic

D1 — Schottky, MBR360

L1 — 330µH, 415-0926 (AIE)

5-pin TO-220 socket—2936 (Loranger Mfg. Co.)

4-pin TO-3 socket—8112-AG7 (Augat Inc.)

Note: Pin numbers are for TO-220 Package

Figure 1.

As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients

which can cause problems. For minimal stray inductance and ground loops, the length of the leads indicated by heavy lines should be kept as

short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results.

Block Diagrams

VIN 1

FEED-

BACK

4

INTERNAL

REGULATOR

FIXED GAIN

3.1k

ERROR AMP

+

1.0k

-

COMPARATOR

+

-

ON/OFF

1 AMP

SWITCH

DRIVER

1.23V

BAND-GAP

REFERENCE

52 kHz

OSCILLATOR

RESET

THERMAL

SHUTDOWN

CURRENT

LIMIT

5 ON/OFF VIN 1

INTERNAL

REGULATOR

ON/OFF

FEED-

BACK 4

2 OUTPUT

FIXED GAIN

ERROR AMP

+

COMPARATOR

-

+

-

1 AMP

SWITCH

DRIVER

3 GND

1.23V

BAND-GAP

REFERENCE

52 kHz

OSCILLATOR

RESET

THERMAL

SHUTDOWN

CURRENT

LIMIT

5 ON/OFF

2 OUTPUT

3 GND

Note: Pin numbers are for the TO-220 package

Fixed Regulator

April 2005

Adjustable Regulator

7

M9999-042205

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