鈥?/div>
Negative output from positive input
Wide Input Range
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
Fast Transient Response
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
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
Pin
1
Ordering Information
Function
+V
i
n
-V
out
GND
PT78NR1
XX
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
Y
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
Standard Application
Vin
+
1
2
3
2
PT78NR100
3
-Vout
C1
COM
C2
+
COM
C1 = Required 100碌F electrolytic
C2 = Required 100碌F electrolytic
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Symbols
I
o
Conditions
Pkg Style 500
PT78NR100 SERIES
Min
V
o
=-5V
V
o
=-7, -8, -9V
V
o
=-12V
V
o
=-15V
0.05*
0.05*
0.05*
0.05*
鈥?/div>
鈥?/div>
鈥?/div>
V
o
=-5V
V
o
=-7, -8, -9V
V
o
=-12V
V
o
=-15V
7
7
7
7
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
600
-40
-40
鈥?/div>
-40
鈥?/div>
鈥?/div>
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
4脳I
max
4
0.5
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵1.0
鹵0.5
鹵0.5
鹵2
100
5.0
75
650
鈥?/div>
鈥?/div>
45
鈥?/div>
500
5
6.5
Max
1.00
0.55
0.40
0.30
鈥?/div>
鈥?/div>
鈥?/div>
25
21
18
15
鹵3.0
鹵1.0
鹵1.0
鈥?/div>
250
鈥?/div>
鈥?/div>
700
+85
+60**
鈥?/div>
+125
鈥?/div>
鈥?/div>
Units
A
A
A
A
Apk
A
mSec
V
V
V
V
%V
o
%V
o
%V
o
%V
o
碌Sec
%V
o
%
kHz
擄C
擄C
擄C/W
擄C
G鈥檚
G鈥檚
Grams
Over V
in
range
Short Circuit Current
Inrush Current
Input Voltage Range
I
sc
I
ir
t
ir
V
in
V
in
=10V
V
in
=10V
On start-up
0.1
鈮?/div>
I
o
鈮?/div>
I
max
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
(with 100碌F output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperaturte Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
畏
茠
o
T
a
T
a
Over V
in
range
T
a
=-20擄C to +70擄C
Over V
in
range
0.1
鈮?/div>
I
o
鈮?/div>
I
max
V
in
=10V, I
o
=I
max
50% load change
V
o
over/undershoot
V
in
=10V, I
o
=0.5脳I
max,
V
o
= -5V
Over V
in
and I
o
ranges
Free Air Convection, (40-60LFM)
Over V
in
and I
o
Ranges
Free Air Convection, (40-60LFM)
Over V
in
and I
o
Ranges
Free Air Convection, (40-60LFM)
鈥?/div>
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
鈥?/div>
胃
ja
T
s
鈥?/div>
鈥?/div>
鈥?/div>
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note:
The PT78NR100 Series requires a 100碌F 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
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1
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3
