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参数资料
| 型号： | PT78ST212V |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 1050 kHz SWITCHING FREQ-MAX, SMA3 |
| 封装： | ROHS COMPLIANT, SIP-3 |
| 文件页数： | 1/3页 |
| 文件大小： | 469K |
| 代理商： | PT78ST212V |
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
12V 2 Amp Positive Step-Down
Integrated Switching Regulator
PT78ST200 Series
Standard Application
C1 = Optional 1F ceramic
C2 = Required 100F electrolytic
Pin-Out Information
Pin
Function
1
Vin
2
GND
3
Vout
Ordering Information
PT78ST2
PT78ST200
C2
+
Vout
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 series of 3-terminal Integrated
Switching Regulators (ISRs) that can
supply up to 24 watts of regulated 12V
power. With a surge capability of 3
Amps and an output 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
—
Sec
(with 100F output cap)
Vo over/undershoot
—
5.0
—
%Vo
Efficiency
η
Vin=17V, Io=2.0A
—
87
—
%
Switching Frequency
o
Over Vin and Io ranges0.95
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 100F electrolytic or tantalum output capacitor for proper operation in all applications.
Pkg Style 600
SLTS060A
(Revised 6/30/2000)
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