PT78HT253H [TI]

2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR; 2放大器正降压集成开关稳压器


型号：	PT78HT253H
厂家：	TEXAS INSTRUMENTS
描述：	2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR 2放大器正降压集成开关稳压器稳压器开关式稳压器或控制器电源电路开关式控制器放大器
文件：	总3页 (文件大小：218K)
中文：	中文翻译
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Application Notes

Mechanical Outline

For assistance or to order, call (800) 531-5782

Product Selector Guide

P T 7 8 H T 2 0 0 S e r i e s

2 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

Revised 5/15/98

• High Efficiency > 85%

• Wide Input Range

• Self-Contained Inductor

• Short-Circuit Protection

• Over-Temperature Protection

• Fast Transient Response

a maximum output current of 2.0 Amps.

The output voltage is laser trimmed

for high accuracy.

These 78 series regulators have excel-

lent line and load regulation with internal

short-circuit and over-temperature protec-

tion, and are offered in a variety of standard

output voltages. These ISRs are very flex-

ible and may be used in a wide variety of

applications.

This is the new generation of the

PT78HT200 Series wide input range

3 terminal regulators. These ISRs have

Pin-Out Information

Ordering Information

PT78HT2

Pin Function

Standard Application

GND

V_out

Output Voltage

Package Suffix

V = Vertical Mount

S = Surface Mount

H = Horizontal

Mount

33 = 3.3 Volts

05 = 5.0 Volts

53 = 5.25 Volts

65 = 6.5 Volts

Vin

Vout

PT78HT200

COM

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Pkg Style 500

Specifications

PT78HT200 SERIES

Characteristics

(T_a= 25°C unless noted)

Symbols

I_o

Conditions

Min

0.1*

—

Typ

—

Max

2.0

Units

Output Current

Over V_inrange

V_in= V_inmin

0.1 ≥ I_o≥ 2.0A

Short Circuit Current

Input Voltage Range

I_sc

6.0

—

Apk

V_in

V_o=3.3V

V_o=5V

—

V_o=6.5V

10.5

Output Voltage Tolerance

∆V_o

Over V_inrange, I_o= 2.0A

T_a= 0°C to +60°C

—

±1.0

±2.0

%Vo

Line Regulation

Load Regulation

V_oRipple/Noise

Reg_line

Regload

V_n

Over V_inrange

—

±0.4

±0.2

±1

±0.8

±0.4

—

%V_o

%Vo

0.1 ≤ I_o≤ 2.0A

V_in= V_inmin, I_o= 2.0A

Transient Response

t_tr

50% load change

100

5.0

—

µSec

%V_o

(with 100µF output cap)

V_oover/undershoot

Efficiency

V_in=9V, I_o= 2.0A

V_o=5V

—

Switching Frequency

ƒ_o

Over V_inand I_oranges V_o=5V, 6.5V

V_o=3.3V

700

950

750

800

kHz

1,000

1,050

Absolute Maximum

T_a

—

-40

—

+85

°C

Operating Temperature Range

Recommended Operating

Temperature Range

Free Air Convection, (40-60LFM)

Over V_inand I_oranges

-40

—

+75**

°C

Thermal Resistance

Storage Temperature

Mechanical Shock

θ_ja

T_s

—

Free Air Convection, (40-60LFM)

—

°C/W

°C

-40

—

+125

—

Per Mil-STD-883D, Method 2002.3

500

G’s

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2,

20-2000 Hz, soldered in a PC board

—

G’s

Weight

—

6.5

—

Grams

*ISR will operate down to no load with reduced specifications.

**See Thermal Derating chart.

Note: The PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com

For assistance or to order, call (800) 531-5782

P T 7 8 H T 2 0 0 S e r i e s

C H A R A C T E R I S T I C

D A T A

PT78HT233 3.3 VDC (See Note 1)

PT78HT205 5.0 VDC (See Note 1)

Efficiency vs Output Current

100

Vin

9.0V

12.0V

15.0V

18.0V

24.0V

28.0V

10.0V

15.0V

0.5

1.5

0.5

1.5

Iout-(Amps)

Ripple vs Output Current

120

100

120

100

Vin

28.0V

24.0V

18.0V

15.0V

12.0V

9.0V

26.0V

20.0V

15.0V

10.0V

9.0V

0.5

1.5

0.5

1.5

Iout-(Amps)

Thermal Derating (T_a)

(See Note 2)

Thermal Derating (T_a)

(See Note 2)

1.8

1.6

1.4

1.2

50°C

60°C

50°C

60°C

70°C

1.8

1.6

1.4

1.2

70°C

85°C

0.8

0.6

0.4

0.2

0.8

0.6

0.4

0.2

Vin-(Volts)

Power Dissipation vs Output Current

2.5

1.5

Vin

26.0V

20.0V

15.0V

10.0V

9.0V

1.5

Vin

28.0V

24.0V

18.0V

15.0V

12.0V

9.0V

0.5

1.5

0.5

1.5

Iout-(Amps)

Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com

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