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PT78NR100

更新时间： 2024-11-18 22:24:59
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德州仪器 - TI 稳压器开关
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1 AMP PLUS TO MINUS VOLTAGE INTEGRATED SWITCHING REGULATOR

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PT78NR100 数据手册

 浏览型号PT78NR100的Datasheet PDF文件第2页浏览型号PT78NR100的Datasheet PDF文件第3页 
Application Notes  
Mechanical Outline  
For assistance or to order, call (800) 531-5782  
Product Selector Guide  
P T 7 8 N R 1 0 0  
S e r i e s  
1 AMP PLUS TO MINUS VOLTAGE  
INTEGRATED SWITCHING REGULATOR  
Revised 5/15/98  
• Negative output from positive input  
• Wide Input Range  
• Self-Contained Inductor  
• Short Circuit Protection  
• Over-Temperature Protection  
• Fast Transient Response  
The PT78NR100 Series creates a  
negative output voltage from a positive  
input voltage greater than 7V. These  
easy-to-use, 3-terminal, Integrated  
Switching Regulators (ISRs) have  
maximum output power of 5 watts and  
a negative output voltage that is laser  
trimmed. They also have excellent line  
and load regulation.  
Pin-Out Information  
Ordering Information  
PT78NR1 XX  
Pin Function  
Y
1
2
3
+V  
in  
Standard Application  
-Vout  
Output Voltage  
Package Suffix  
GND  
03 = -3.0 Volts  
05 = -5.0 Volts  
52 = -5.2 Volts  
07 = -7.0 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  
Vin  
-Vout  
COM  
1
2
PT78NR100  
3
+
C2  
C1  
COM  
+
C1 = Required 100µF electrolytic  
C2 = Required 100µF electrolytic  
Pkg Style 500  
Specifications  
PT78NR100 SERIES  
Characteristics  
(Ta= 25°C unless noted)  
Symbols  
Conditions  
Over Vin range Vo=-5V  
Min  
Typ  
Max  
Units  
Output Current  
Io  
0.05*  
0.05*  
0.05*  
0.05*  
—
—
—
—
1.00  
0.55  
0.40  
0.30  
A
A
A
A
Vo=-7, -8, -9V  
Vo=-12V  
Vo=-15V  
Short Circuit Current  
Inrush Current  
Isc  
Vin=10V  
—
4×Imax  
—
Apk  
Iir  
tir  
Vin=10V  
—
—
4
—
—
A
On start-up  
0.5  
mSec  
Input Voltage Range  
Vin  
0.1 ≤ Io ≤ Imax  
Vo=-5V  
7
7
7
7
—
—
—
—
25  
21  
18  
15  
V
V
V
V
Vo=-7, -8, -9V  
Vo=-12V  
Vo=-15V  
Output Voltage Tolerance  
∆Vo  
Over Vin range  
—
±1.0  
±3.0  
%Vo  
Ta=-20°C to +70°C  
Over Vin range  
0.1 ≤ Io ≤ Imax  
Line Regulation  
Load Regulation  
Vo Ripple/Noise  
Regline  
Regload  
Vn  
—
—
—
±0.5  
±0.5  
±2  
±1.0  
±1.0  
—
%Vo  
%Vo  
%Vo  
Vin=10V, Io=Imax  
Transient Response  
ttr  
50% load change  
—
—
100  
5.0  
250  
—
µSec  
%Vo  
(with 100µF output cap)  
Vo over/undershoot  
Efficiency  
η
Vin=10V, Io=0.5×Imax, Vo = -5V  
—
75  
—
%
Switching Frequency  
ƒo  
Ta  
Over Vin and Io ranges  
600  
650  
700  
kHz  
Absolute Maximum  
Operating Temperaturte Range  
Free Air Convection, (40-60LFM)  
Over Vin and Io Ranges  
-40  
-40  
—
—
+85  
°C  
°C  
Recommended Operating  
Temperature Range  
Ta  
Free Air Convection, (40-60LFM)  
Over Vin and Io Ranges  
+60**  
Thermal Resistance  
Storage Temperature  
Mechanical Shock  
θja  
Ts  
—
—
Free Air Convection, (40-60LFM)  
—
—
45  
—
°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  
—
—
—
5
G’s  
Weight  
—
—
6.5  
Grams  
*ISR will operate down to no load with reduced specifications.  
**See Thermal Derating chart.  
Note: The PT78NR100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.  
14  
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com  
123

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