78SR205HC [TI]
2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR; 2放大器正降压集成开关稳压器型号: | 78SR205HC |
厂家: | TEXAS INSTRUMENTS |
描述: | 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR |
文件: | 总3页 (文件大小:201K) |
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 2 0 0 S e r i e s
2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
The 78ST200 is a series of wide
• High Efficiency > 82%
input voltage, 3 terminal Integrated
Switching Regulators (ISRs). Employ-
ing a ceramic substrate, these ISRs
have a maximum output current of 2A.
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 78ST200 series regulators
have internal short-circuit and over-
temperature protection and may be
used in a wide variety of applications.
Pin-Out Information
Ordering Information
78ST2
C
XX
Y
Pin No. Function
1
2
3
V
in
Standard Application
GND
Vout
Output Voltage
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
33 = 3.3 Volts
35 = 3.45 Volts
05 = 5.0 Volts
Vin
Vout
GND
1
3
78ST200
2
+
C1
GND
C2
(For dimensions and PC board
layout see Package Style 500.)
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Specifications
78ST200 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Io
Conditions
Min
Typ
Max
Units
Output Current
Over Vin range
Io = 0.1 to 3.0A
0.1*
—
2.0
A
Input Voltage Range
Vin
Vo < 3.5V
Vo = 5.0V
7
8
—
—
15
20
V
V
Output Voltage Tolerance
∆Vo
Over Vin range, Io = 2.0A
Ta = 0°C to +60°C
—
±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 ≤ 2.0A
Vin = Vin min, Io = 2.0A
Transient Response
(with 100µF output cap)
ttr
50% load change
Vo over/undershoot
100
5.0
—
µSec
%Vo
Efficiency
η
Vin = 9V, Io = 2.0A, Vo = 5V
Over Vin and Io ranges
—
82
—
%
Switching Frequency
ƒo
0.95
1.0
1.05
MHz
Absolute Maximum
Operating Temperature Range
Ta
—
-40
—
+85
°C
Recommended Operating
Temperature Range
Ta
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
-40
—
+85**
°C
Thermal Resistance
Storage Temperature
Mechanical Shock
θja
Ts
—
—
Free Air Convection, (40-60LFM)
—
—
38
—
°C/W
°C
-40
—
—
+125
—
Per Mil-STD-883D, Method 2002.3
500
G’s
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
—
5
7
—
—
G’s
Weight
—
—
Grams
*
ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
Note: The 78ST200 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 2 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
78ST233_ 3.3 VDC
78ST205_ 5.0 VDC
(See Note 1)
(See Note 1)
Efficiency vs Output Current
Efficiency vs Output Current
100
100
90
80
70
60
50
40
90
Vin
7.0V
Vin
7.5V
9.0V
80
8.0V
10.0V
12.0V
15.0V
12.0V
15.0V
20.0V
70
60
50
40
0.0
0.5
1.0
1.5
2.0
0.0
0.5
1.0
1.5
2.0
Iout (A)
Iout (A)
Ripple vs Output Current
Ripple vs Output Current
30
25
20
15
10
5
30
25
20
15
10
5
Vin
Vin
7.5V
7.0V
8.0V
9.0V
10.0V
12.0V
15.0V
12.0V
15.0V
20.0V
0
0
0.0
0.5
1.0
1.5
2.0
0.0
0.5
1.0
1.5
2.0
Iout (A)
Iout (A)
Thermal Derating (Ta) (See Note 2)
Thermal Derating (Ta) (See Note 2)
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
70°C
No Derating
@ 85°C
85°C
7
9
11
13
15
8
10
12
14
16
18
20
Vin (Volts)
Vin (Volts)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
Vin
7.0V
Vin
7.5V
8.0V
9.0V
10.0V
12.0V
15.0V
12.0V
15.0V
20.0V
0.0
0.5
1.0
1.5
2.0
0.0
0.5
1.0
1.5
2.0
Iout (A)
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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