Datasheet > PT78SR105S

PT78SR105S

更新时间： 2024-11-01 22:25:07

品牌	Logo	应用领域
德州仪器 - TI		稳压器开关
页数	文件大小	规格书
3页	224K
描述
-1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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PT78SR105S 数据手册

Application Notes

Mechanical Outline

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

Product Selector Guide

P T 7 9 S R 1 0 0 S e r i e s

-1.5 AMP NEGATIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

Revised 5/15/98

• High Efficiency > 85%

Regulators (ISRs). These ISRs have a

maximum output current of -1.5 Amps

and an output voltage that is laser

trimmed to most industry standard volt-

ages. They have excellent line and load

regulation, and are ideal for applications,

such as RS232 and Ethernet communica-

tions, ECL logic, and op-amp circuitry.

• Self-Contained Inductor

• Short Circuit Protection

• Over-Temperature Protection

The PT79SR100 Series is a new

line of Negative Input/Negative Out-

put 3-terminal Integrated Switching

Pin-Out Information

Ordering Information

PT79SR1

Pin Function

GND

-V_in

Output Voltage

Package Suffix

Standard Application

-V_out

05 = -5.0 Volts

52 = -5.2 Volts

08 = -8.0 Volts

09 = -9.0 Volts

12 = -12.0 Volts

15 = -15.0 Volts

V = Vertical Mount

S = Surface Mount

H = Horizontal

Mount

COM

-Vout

-Vin

PT79SR1

C1 = Optional ceramic (1µF)

C2 = Optional ceramic (1-5µF)

D1 = Zener diode required to clamp

turn-on overshoot

(See Application Note)

Pkg Style 500

Specifications

PT79SR100 SERIES

Characteristics

(T_a= 25°C unless noted)

Symbols

I_o

Conditions

Min

-0.1*

—

Typ

—

Max

-1.5

Units

Output Current

Over V_inrange

V_in=V_o-4V

Short Circuit Current

Input Voltage Range

I_sc

-3.5

—

Apk

V_in

I_o=-0.1 to -1.5 A

-0.1 ≥ I_o≥ -1.5 A

V_o=-5V

V_o=-15V

-9

-19

—

-30

Output Voltage Tolerance

∆V_o

Over Vin range, I_o=-1.5 A

T_a=-20°C to shutdown

—

±1.0

±3.0

%V^o

Line Regulation

Load Regulation

V_oRipple/Noise

Transient Response

Reg_line

Reg_load

V_n

Over V_inrange

—

±1.0

±0.5

±2.0

±1.0

—

%V_o

mV_pp

-0.1 ≤ I_o≤ -1.5 A

V_in=-15V, I_o=-1.0 A,V_o=-5V

t_tr

50% load change

—

100

—

µSec

%V_o

V_o=overshoot/undershoot

Efficiency

V_in=-10V, I_o=-1.0A, V_o=-5V

Over V_inand I_oranges

—

Switching Frequency

ƒ_o

T_a

0.95

1.0

1.05

MHz

Absolute Maximum

Operating Temperature Range

-40

—

+85

°C

Recommended Operating

Temperature Range

T_a

Free Air Convection, (40-60LFM)

Over V_inand I_oranges

+60**

Thermal Resistance

Temperature Coefficient

Storage Temperature

Mechanical Shock

θ_ja

T_c

T_s

—

Free Air Convection, (40-60LFM)

Over V_inand I_oranges

—

°C/W

mV/°C

°C

—

±0.5

—

±1.5

+125

—

-40

—

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

—

7.0

—

Grams

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

** See Thermal Derating chart.

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

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