78ST305 [TI]
5Vout 3Amp Wide Input Positive Step-Down ISR ; 5Vout 3Amp宽输入正降压型ISR\n
| 型号： | 78ST305 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 5Vout 3Amp Wide Input Positive Step-Down ISR
|
| 文件： | 总3页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
For assistance or to order, call (800) 531-5782
7 8 S T 3 0 0 S e r i e s
3 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
The 78ST300 is a series of wide
• High Efficiency > 80%
input voltage, 3 terminal Integrated
Switching Regulators (ISRs). Employ-
ing a ceramic substrate, these ISRs
have a maximum output current of 3A.
The output voltage is laser trimmed
for high accuracy.
• Wide Input Range
• Self-Contained Inductor
• Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
The 78ST300 series regulators
have internal short-circuit and over-
temperature protection and may be
used in a wide variety of applications.
Ordering Information
Pin-Out Information
78ST3
C
Y
XX
Pin No. Function
Standard Application
1
2
3
V
in
GND
Vout
Output Voltage
Package Suffix
Vin
Vout
GND
1
3
V = Vertical Mount
H = Horizontal
Mount
05 = 5.0 Volts
78ST300
2
+
C1
GND
C2
(For dimensions and PC board
layout see Package Style 600.)
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Specifications
78ST300 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
0.1*
8
Typ
—
Max
3.0
20
Units
A
Output Current
Io
Over Vin range
Input Voltage Range
Output Voltage Tolerance
Vin
∆Vo
Io = 0.1 to 3.0A
Over Vin range
Ta = 0°C to +60°C
—
V
—
±1.0
±2.0
%Vo
Line Regulation
Load Regulation
Ripple/Noise
Regline
Regload
Vn
Over Vin range
—
—
—
—
±0.4
±0.2
1
±0.8
±0.4
—
%Vo
%Vo
%Vo
0.1 ≤ Io ≤ 3.0A
Vin = Vin min, Io = 3.0A
Transient Response
(with 100µF output cap)
ttr
50% load change
Vo over/undershoot
100
5.0
—
µSec
%Vo
Efficiency
η
Vin = 9V, Io = 3.0A
—
80
—
%
Switching Frequency
ƒo
Over Vin and Io ranges
0.95
1.0
1.05
MHz
Absolute Maximum
Operating Temperature Range
Ta
—
-40
—
+70
°C
Recommended Operating
Temperature Range
Ta
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
-40
—
+70**
°C
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
θja
Ts
—
—
Free Air Convection, (40-60LFM)
—
—
35
—
°C/W
°C
-40
—
—
+125
—
Per Mil-STD-883D, Method 2002.3
500
G’s
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
—
10
11
—
—
G’s
Weight
—
—
Grams
*
ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
Note: The 78ST300 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
For assistance or to order, call (800) 531-5782
7 8 S T 3 0 0 S e r i e s
C H A R A C T E R I S T I C
D A T A
78ST305_ 5.0 VDC
(See Note 1)
Efficiency vs Output Current
100
90
80
70
60
50
40
Vin
7.5V
9.0V
12.0V
15.0V
20.0V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Iout (A)
Ripple vs Output Current
40
35
30
25
20
15
10
5
Vin
7.5V
9.0V
12.0V
15.0V
20.0V
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Iout (A)
Thermal Derating (Ta) (See Note 2)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
50°C
60°C
70°C
85°C
8
10
12
14
16
18
20
Vin (Volts)
Power Dissipation vs Output Current
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Vin
7.5V
9.0V
12.0V
15.0V
20.0V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Iout (A)
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Note)
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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