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PT78ST200 Datasheet(PDF) 1 Page - Texas Instruments

Part No. PT78ST200
Description  12V 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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PT78ST200 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
18
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
12V 2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
PT78ST200 Series
Standard Application
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin
Function
1
Vin
2
GND
3
Vout
Ordering Information
PT78ST2
PT78ST200
C2
+
Vout
COM
COM
Vin
C1
1
2
3
High Efficiency > 87%
Wide Input Range
Aluminum Heatsink for
Applications with Airflow
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
Pin Compatible with Linear
3-Terminal, “78” Series Regulators
Small Footprint
The Power Trends’ 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.
XX
Y
Output Voltage
12
= 12.0 Volts
Package Suffix
V
= Vertical Mount
Specifications
Characteristics
PT78ST200 SERIES
(T
a = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
0.1*
2.0
A
With forced air cooling
Short Circuit Current
Isc
Vin = Vin min
5.0
Apk
Input Voltage Range
Vin
0.1
≤ Io ≤ 2.0A
16
28
V
Output Voltage Tolerance
∆Vo
Over Vin range, Io= 2.0A
±1.0
±2.0
%Vo
Ta= 0°C to +60°C
Line Regulation
Regline
Over Vin range
±0.4
±0.8
%Vo
Load Regulation
Regload
0.1
≤ Io ≤ 2.0A
±0.2
±0.4
%Vo
Vo Ripple/Noise
Vn
Vin=17V, Io=2.0A, Vo=12V
120
mVpp
Transient Response
ttr
50% load change
100
µSec
(with 100µF output cap)
Vo over/undershoot
5.0
%Vo
Efficiency
η
Vin=17V, Io=2.0A
87
%
Switching Frequency
ƒo
Over Vin and Io ranges
0.95
1.0
1.05
MHz
Absolute Maximum
Ta
-40
+65
°C
Operating Temperature Range
Recommended Operating
Ta
Free Air Convection, (40-60LFM)
-40
+55**
°C
Temperature Range
at Vin= 24V, Io=2A
Thermal Resistance
θja
Free Air Convection, (40-60LFM)
35
°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,
—10
G’s
20-2000 Hz, Soldered in a PC board
Weight
11
Grams
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The PT78ST200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
Pkg Style 600


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