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Small Footprint
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
The Power Trends鈥?PT78ST200 is
a new 3-terminal Integrated Switching
Regulator (ISR) that can supply up to 24
watts of regulated 12V power. With a
surge capability of 3 Amps and an out-
put voltage that is laser trimmed, it is
ideal for inductive load applications
such as disk drive motors.
Pin-Out Information
Pin
1
Ordering Information
Function
V
in
GND
V
out
PT78ST2
XX
Output Voltage
12
= 12.0 Volts
Y
Package Suffix
V
= Vertical Mount
Standard Application
Vin
1
2
3
Vout
+
COM
PT78ST200
2
3
C1
COM
C2
C
1
= Optional 1碌F ceramic
C
2
= Required 100碌F electrolytic
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
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 Temperature Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
Symbols
I
o
I
sc
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
畏
Pkg Style 600
PT78ST200 SERIES
Conditions
Over V
in
range
With forced air cooling
V
in
= V
in
min
Min
0.1*
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16
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0.95
-40
-40
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-40
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Typ
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5.0
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鹵1.0
鹵0.4
鹵0.2
120
100
5.0
87
1.0
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35
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500
10
11
Max
2.0
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28
鹵2.0
鹵0.8
鹵0.4
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1.05
+65
+55**
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+125
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Units
A
Apk
V
%Vo
%V
o
%V
o
mV
pp
碌Sec
%V
o
%
MHz
擄C
擄C
擄C/W
擄C
G鈥檚
G鈥檚
Grams
0.1
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I
o
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2.0A
Over V
in
range, I
o
= 2.0A
T
a
= 0擄C to +60擄C
Over V
in
range
0.1
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I
o
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2.0A
V
in
=17V, I
o
=2.0A, V
o
=12V
50% load change
V
o
over/undershoot
V
in
=17V, I
o
=2.0A
Over V
in
and I
o
ranges
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Free Air Convection, (40-60LFM)
at V
in
= 24V, I
o
=2A
Free Air Convection, (40-60LFM)
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Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
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**See Thermal Derating chart.
茠
o
T
a
T
a
胃
ja
T
s
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*ISR will operate down to no load with reduced specifications.
Note:
The PT78ST200 Series requires a 100碌F electrolytic or tantalum output capacitor for proper operation in all applications.
18
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
2
3
