LM2576T-15 查看數據表（PDF） - Motorola => Freescale

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LM2576T-15

Easy Switcher 3.0 A Step–Down Voltage Regulator

Motorola => Freescale 

Unregulated

DC Input

Cin

LM2576

Figure 1. Block Diagram and Typical Application

Typical Application (Fixed Output Voltage Versions)

7.0 V – 40 V

+Vin

Unregulated

DC Input

1

Cin

100 µF

Feedback

LM2576

4

L1

100 µH

Output

2

3 Gnd 5 ON/OFF

D1

1N5822

5.0 V Regulated

Output 3.0 A Load

Cout

1000 µF

Representative Block Diagram and Typical Application

+Vin

1

4

Feedback

3.1 V Internal

Regulator

ON/OFF

R2 Fixed Gain

Error Amplifier Comparator

R1

1.0 k Freq

Shift

18 kHz

1.235 V

Band–Gap

Reference

52 kHz

Oscillator

Current

Limit

Latch

Reset

Driver

1.0 Amp

Switch

Thermal

Shutdown

ON/OFF

5

Output

R2

Voltage Versions

(Ω)

3.3 V

1.7 k

5.0 V

3.1 k

12 V

8.84 k

15 V

11.3 k

For adjustable version

R1 = open, R2 = 0 Ω

Output

2

Gnd

3

L1

D1

Regulated

Output

Vout

Cout

Load

ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond

which damage to the device may occur.)

Rating

Symbol

Value

Unit

Maximum Supply Voltage

ON/OFF Pin Input Voltage

Output Voltage to Ground (Steady–State)

Vin

45

V

–

–0.3 V ≤ V ≤ +Vin

V

–

–1.0

V

Power Dissipation

Case 314B and 314D (TO–220, 5–Lead)

Thermal Resistance, Junction–to–Ambient

Thermal Resistance, Junction–to–Case

Case 936A (D2PAK)

Thermal Resistance, Junction–to–Ambient

Thermal Resistance, Junction–to–Case

Storage Temperature Range

Minimum ESD Rating (Human Body Model:

C = 100 pF, R = 1.5 kΩ)

PD

RθJA

RθJC

PD

RθJA

RθJC

Tstg

–

Internally Limited

65

5.0

Internally Limited

70

5.0

–65 to +150

2.0

W

°C/W

°C/W

W

°C/W

°C/W

°C

kV

Lead Temperature (Soldering, 10 seconds)

–

260

°C

Maximum Junction Temperature

TJ

150

°C

NOTE: ESD data available upon request.

2

MOTOROLA ANALOG IC DEVICE DATA

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