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PT78VR108H Datasheet(PDF) 1 Page - Texas Instruments

Part # PT78VR108H
Description  1 AMP PLUS TO MINUS VOLTAGE INTEGRATED SWITCHING REGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PT78VR108H Datasheet(HTML) 1 Page - Texas Instruments

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For assistance or to order, call (800) 531-5782
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
14
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
PT78NR100 Series
Standard Application
C1 = Required 100µF electrolytic
C2 = Required 100µF electrolytic
Ordering Information
PT78NR1
Pin-Out Information
Pin
Function
1+Vin
2-Vout
3
GND
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.
1 AMP PLUS TO MINUS VOLTAGE
INTEGRATED SWITCHING REGULATOR
PT78NR100
+
-Vout
COM
COM
Vin
1
3
2
C2
C1
+
Specifications
Characteristics
PT78NR100 SERIES
(T
a= 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
Vo=-5V
0.05*
1.00
A
Vo=-7, -8, -9V
0.05*
0.55
A
Vo=-12V
0.05*
0.40
A
Vo=-15V
0.05*
0.30
A
Short Circuit Current
Isc
Vin=10V
4
×Imax
Apk
Inrush Current
Iir
Vin=10V
4
A
tir
On start-up
0.5
mSec
Input Voltage Range
Vin
0.1
≤ Io ≤ Imax
Vo=-5V
7
25
V
Vo=-7, -8, -9V
7
21
V
Vo=-12V
7
18
V
Vo=-15V
7
15
V
Output Voltage Tolerance
∆Vo
Over Vin range
±1.0
±3.0
%Vo
Ta=-20°C to +70°C
Line Regulation
Regline
Over Vin range
±0.5
±1.0
%Vo
Load Regulation
Regload
0.1
≤ Io ≤ Imax
±0.5
±1.0
%Vo
Vo Ripple/Noise
Vn
Vin=10V, Io=Imax
—±2
%Vo
Transient Response
ttr
50% load change
100
250
µSec
(with 100µF output cap)
Vo over/undershoot
5.0
%Vo
Efficiency
η
Vin=10V, Io=0.5×Imax, Vo = -5V
75
%
Switching Frequency
ƒo
Over Vin and Io ranges
600
650
700
kHz
Absolute Maximum
Ta
Free Air Convection, (40-60LFM)
-40
+85
°C
Operating Temperaturte Range
Over Vin and Io Ranges
Recommended Operating
Ta
Free Air Convection, (40-60LFM)
-40
+60**
°C
Temperature Range
Over Vin and Io Ranges
Thermal Resistance
θ
ja
Free Air Convection, (40-60LFM)
45
°C/W
Storage Temperature
Ts
-40
+125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
500
G’s
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
—5
G’s
20-2000 Hz, soldered in a PC board
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.
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
XX
Y
Output Voltage
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
Pkg Style 500


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