78SR205SC [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：	78SR205SC
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放大器
文件：	总3页 (文件大小：201K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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

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

2 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

Revised 6/30/98

The 78ST200 is a series of wide

• High Efficiency > 82%

input voltage, 3 terminal Integrated

Switching Regulators (ISRs). Employ-

ing a ceramic substrate, these ISRs

have a maximum output current of 2A.

The output voltage is laser trimmed

for high accuracy.

• Wide Input Range

• Self-Contained Inductor

• Short-Circuit Protection

• Over-Temperature Protection

• Fast Transient Response

The 78ST200 series regulators

have internal short-circuit and over-

temperature protection and may be

used in a wide variety of applications.

Pin-Out Information

Ordering Information

78ST2

Pin No. Function

Standard Application

GND

V_out

Output Voltage

Package Suffix

V = Vertical Mount

S = Surface Mount

H = Horizontal

Mount

33 = 3.3 Volts

35 = 3.45 Volts

05 = 5.0 Volts

Vin

Vout

GND

78ST200

GND

(For dimensions and PC board

layout see Package Style 500.)

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Specifications

78ST200 SERIES

Characteristics

(T_a= 25°C unless noted)

Symbols

I_o

Conditions

Min

Typ

Max

Units

Output Current

Over V_inrange

I_o= 0.1 to 3.0A

0.1*

—

2.0

Input Voltage Range

V_in

V_o< 3.5V

V_o= 5.0V

—

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

Ripple/Noise

Reg_line

Regload

V_n

Over V_inrange

—

±0.4

±0.2

±0.8

±0.4

—

%V_o

%Vo

0.1 ≤ I_o≤ 2.0A

V_in= V_inmin, I_o= 2.0A

Transient Response

(with 100µF output cap)

t_tr

50% load change

V_oover/undershoot

100

5.0

—

µSec

%V_o

Efficiency

V_in= 9V, I_o= 2.0A, V_o= 5V

Over V_inand I_oranges

—

Switching Frequency

ƒ_o

0.95

1.0

1.05

MHz

Absolute Maximum

Operating Temperature Range

T_a

—

-40

—

+85

°C

Recommended Operating

Temperature Range

T_a

Free Air Convection, (40-60LFM)

Over V_inand I_oranges

-40

—

+85**

°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

—

Grams

ISR will operate down to no load with reduced specifications.

** See Thermal Derating chart.

Note: The 78ST200 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

7 8 S 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

78ST233_ 3.3 VDC

78ST205_ 5.0 VDC

(See Note 1)

Efficiency vs Output Current

100

Vin

7.0V

Vin

7.5V

9.0V

8.0V

10.0V

12.0V

15.0V

12.0V

15.0V

20.0V

0.0

0.5

1.0

1.5

2.0

0.0

0.5

1.0

1.5

2.0

Iout (A)

Ripple vs Output Current

Vin

7.5V

7.0V

8.0V

9.0V

10.0V

12.0V

15.0V

12.0V

15.0V

20.0V

0.0

0.5

1.0

1.5

2.0

0.0

0.5

1.0

1.5

2.0

Iout (A)

Thermal Derating (T_a) (See Note 2)

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

70°C

No Derating

@ 85°C

85°C

Vin (Volts)

Power Dissipation vs Output Current

2.0

1.5

1.0

0.5

0.0

2.0

1.5

1.0

0.5

0.0

Vin

7.0V

Vin

7.5V

8.0V

9.0V

10.0V

12.0V

15.0V

12.0V

15.0V

20.0V

0.0

0.5

1.0

1.5

2.0

0.0

0.5

1.0

1.5

2.0

Iout (A)

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 Note)

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

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78SR205SC [TI]

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