P2576L-XX-SH2-T [UTC]

3A STEP-DOWN VOLTAGE SWITCHING REGULATOR; 3A降压开关稳压器


型号：	P2576L-XX-SH2-T
厂家：	Unisonic Technologies
描述：	3A STEP-DOWN VOLTAGE SWITCHING REGULATOR 3A降压开关稳压器稳压器开关
文件：	总8页 (文件大小：288K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

P2576

LINEAR INTEGRATED CIRCUIT

3A STEP-DOWN VOLTAGE

SWITCHING REGULATOR

TO-220B

DESCRIPTION

As a step-down (buck) switching regulator, the UTC P2576

provides drives 3A load. The UTC P2576 are simple because it

only needs to use a minimum number of external components.

Frequency compensation and a fixes-frequency oscillator are

in it. UTC P2576 can perform with standard inductors, and

simplifying the switch mode power supplies’ design. UTC P2576

guarantees output load conditions and ±10% on the oscillator

frequency. Its external shutdown is included with 50μA standby

current. As well as thermal shutdown for full protection under fault

conditions, the output switch has cycle by cycle current limiting.

TO-220-5

TO-263-5

FEATURES

SOP-8

* Output Current 3A

* Input Voltage Range from 7V to 40V

* Requires 4 External Components

* Very High Efficiency

HSOP-8

* TTL Shutdown

* Low Power Standby Mode

* Thermal Shutdown,

* Current Limit Protection

* Internal Oscillator: 52 kHz Fixed Frequency

ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

P2576L-xx-TA5-T

P2576L-xx-TB5-T

P2576L-xx-TQ5-R

P2576L-xx-TQ5-T

P2576L-xx-S08-R

P2576L-xx-S08-T

P2576L-xx-SH2-R

P2576L-xx-SH2-T

P2576G-xx-TA5-T

P2576G-xx-TB5-T

P2576G-xx-TQ5-R

P2576G-xx-TQ5-T

P2576G-xx-S08-R

P2576G-xx-S08-T

P2576G-xx-SH2-R

P2576G-xx-SH2-T

TO-220-5

TO-220B

TO-263-5

SOP-8

Tube

Tape Reel

Tube

Tape Reel

Tube

SOP-8

HSOP-8

Tape Reel

Tube

Note: xx: Output Voltage, refer to Marking Information.

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P2576

LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION of SOP-8/HSOP-8

GND

V_IN

V_OUT

GND

ON/OFF

PIN DESCRIPTIONS

FOR SOP-8/HSOP-8

PIN NO.

PIN NAME

PIN DESCRIPTION

V_IN

V_OUT

Input voltage

Output voltage

Feed back.

ON/ OFF

GND

ON/OFF select pin, when connected to the ground the chip in operating normally.

Ground

5,6,7,8

FOR TO-220B/TO-220-5/TO-263-5

PIN NO.

PIN NAME

V_IN

PIN DESCRIPTION

Input voltage

Output voltage

Ground

V_OUT

GND

Feed back.

select pin, when connected to the ground the chip in operating normally.

ON/ OFF

ON/OFF

MARKING INFORMATION

PACKAGE

VOLTAGE CODE

MARKING

TO-220B

TO-220-5

TO-263-5

50:5.0V

AD:ADJ

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P2576

LINEAR INTEGRATED CIRCUIT

BLOCK DIAGRAM

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P2576

LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS (T_A=25°C, unless otherwise specified)

PARAMETER

SYMBOL

V_CC

RATINGS

UNITS

Supply Voltage

Maximum Supply Voltage

V_CC(MAX)

V_ON/OFF

V_OUT

-0.3 ~ V_IN

ON/ OFF Pin Input Voltage

Output Voltage to Ground (Steady State)

Power Dissipation

-1.0

Internally Limited

+150

P_D

°C

Junction Temperature

T_J

Operating Temperature

Storage Temperature

T_OPR

-40 ~ +125

-65 ~ +150

T_STG

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (T_J=25°C, V_IN=12V, I_LOAD=500mA.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN TYP MAX UNIT

P2576 - 5.0V

V_IN=12V, I_LOAD=0.5A

4.900 5.0 5.100

4.800 5.0 5.200

Feedback Voltage

V_OUT

8V≤V_IN≤40V, 0.5A≤I_LOAD≤3.0A

V_IN= 12 V, I_LOAD=3.0 A

Efficiency

P2576 - ADJ

V_IN=12V, I_LOAD=0.5A, V_OUT=5V

1.217 1.23 1.243

Feedback Voltage

V_FB

8V≤V_IN≤40V, 0.5A≤I_LOAD≤3.0A, V_OUT=5V 1.193 1.23 1.267

Efficiency

V_IN= 12 V, I_LOAD=3.0 A, V_OUT=5V

ALL OUTPUT VOLTAGE

Oscillator Frequency

Saturation Voltage

Max Duty Cycle (ON)

Current Limit

f_OSC

(Note 4)

(Note 2)

1.4

kHz

V_SATI_OUT=3A (Note 1)

1.8

I_LIMIT(Note 1, 4)

4.2 5.8

6.9

V_IN=40V, Output=-1V (Notes 3)

μA

Output Leakage Current

I_I(LEAK)

Output=-1V

(Note 6)

7.5

200

Quiescent Current

I_STBY

V_IH

V_IL

Standby Quiescent Current

ON/ OFF Pin=5V (OFF)

V_OUT=0V

2.2 1.4

1.2

ON/OFF Pin Logic Input Level

ON/OFF Pin Input Current

V_OUT=Nominal Output Voltage

1.0

I_IΗ

μA

ON/ OFF Pin=5V (OFF)

ON/ OFF Pin=5V (ON)

I_IL

μA

Notes:1.Output pin sourcing current. No diode, inductor or capacitor connected to output.

2.Feedback pin removed from output and connected to 0V.

3.Feedback pin removed from output and connected to +12V, to force the output transistor OFF.

4.The oscillator frequency reduces to approximately 11 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 power dissipation of P2576 by lowering the minimum duty cycle

from 5% down to approximately 2%.

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P2576

LINEAR INTEGRATED CIRCUIT

APPLICATION CIRCUIT

Feedback

Output

V_IN

100μH

DC Input

P2576

+5V

3A Load

L₁

GND

ON/OFF

C_I

100μF

D₁

C_O

680μF

1N5822

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P2576

LINEAR INTEGRATED CIRCUIT

TYPICAL TEST CIRCUIT

Feedback

V_IN

P2576

L₁

Output

V_OUT

100μH

GND

ON/OFF

LOAD

V_IN

C_I

100μF

C_O

680μF

Unregulated

DC Input

D₁

MBR360

C_I: 100μF, 75V

C_O: 680μF, 25V

D₁: Schottky, MBR360

L₁: 100μH

R₁: 2K, 0.1%

R₂: 6.12K, 0.1%

Feedback

Output

V_IN

UTC

P2576 - ADJ

100μH

V_OUT=5.0 V

GND

ON/OFF

7V-40V

Unregulated

DC Input

C_IN

100μF

LOAD

D₁

MBR360

C_OUT

680μF

R₂

Note: V_OUT= V_REF(1+

)

R₁

V_OUT

R₂= R₁(

V_REF

−1)

(Where V_REF=1.23V, R1 between 1k and 5k.)

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P2576

LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUIT (T_A=25°C, V_CC=12V, unless otherwise specified)

Quiescent Current

Dropout Voltage

2.0

1.5

V_OUT=5V,

Measured at Ground Pin T =25°C

I_LOAD=3A

1.0

0.5

I_LOAD=0.2A

-75 -50 -25

25 50 75 100 125 150

Junction Temperature (°C)

Input Voltage (V)

Load Transient Response

Standby Quiescent Current

V_IN=40V

ON/OFF PIN:5V

V_IN=12V

-1

V_IN=12V, V_OUT=5V@3A

0.01

0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0

-50

75 100 125

-25

Junction Temperature (°C)

Time(ms)

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P2576

LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUIT(Cont.)

Quiescent Current vs. Duty Cycle

Adjustable Version Only

Feedback Voltage vs Duty Cycle

40.0

37.5

35.0

32.5

30.0

27.5

25.0

22.5

20.0

15.0

10.0

5.0

V_IN=7V

20.0

17.5

15.0

12.5

10.0

7.5

V_IN=40V

-5.0

-10.0

-15.0

-20.0

5.0

I_LOAD=0.5A

2.5

100

Duty Cycle (％)

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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