PT78HT265V [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： | PT78HT265V |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR |
| 文件： | 总3页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Application Notes
Mechanical Outline
For assistance or to order, call (800) 531-5782
Product Selector Guide
P T 7 8 H T 2 0 0 S e r i e s
2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 5/15/98
• High Efficiency > 85%
• Wide Input Range
• Self-Contained Inductor
• Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
a maximum output current of 2.0 Amps.
The output voltage is laser trimmed
for high accuracy.
These 78 series regulators have excel-
lent line and load regulation with internal
short-circuit and over-temperature protec-
tion, and are offered in a variety of standard
output voltages. These ISRs are very flex-
ible and may be used in a wide variety of
applications.
This is the new generation of the
PT78HT200 Series wide input range
3 terminal regulators. These ISRs have
Pin-Out Information
Ordering Information
PT78HT2
XX
Y
Pin 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
05 = 5.0 Volts
53 = 5.25 Volts
65 = 6.5 Volts
Vin
Vout
1
3
PT78HT200
2
+
C1
COM
C2
COM
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pkg Style 500
Specifications
PT78HT200 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Io
Conditions
Min
0.1*
—
Typ
—
Max
2.0
Units
A
Output Current
Over Vin range
Vin = Vin min
0.1 ≥ Io ≥ 2.0A
Short Circuit Current
Input Voltage Range
Isc
6.0
—
Apk
Vin
Vo=3.3V
Vo=5V
9
—
—
—
15
28
28
V
V
V
9
Vo=6.5V
10.5
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
Vo 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
ttr
50% load change
100
5.0
—
µSec
%Vo
(with 100µF output cap)
Vo over/undershoot
Efficiency
η
Vin=9V, Io = 2.0A
Vo=5V
—
80
—
%
Switching Frequency
ƒo
Over Vin and Io ranges Vo=5V, 6.5V
Vo=3.3V
700
950
750
800
kHz
kHz
1,000
1,050
Absolute Maximum
Ta
Ta
—
-40
—
+85
°C
Operating Temperature Range
Recommended Operating
Temperature Range
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
-40
—
+75**
°C
Thermal Resistance
Storage Temperature
Mechanical Shock
θja
Ts
—
—
Free Air Convection, (40-60LFM)
—
—
40
—
°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
G’s
Weight
—
—
6.5
—
Grams
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
16
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
P T 7 8 H 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
PT78HT233 3.3 VDC (See Note 1)
PT78HT205 5.0 VDC (See Note 1)
Efficiency vs Output Current
Efficiency vs Output Current
100
90
80
70
60
50
40
100
90
80
70
60
50
40
Vin
Vin
9.0V
9.0V
12.0V
15.0V
18.0V
24.0V
28.0V
10.0V
15.0V
0
0.5
1
1.5
2
0
0.5
1
1.5
2
Iout-(Amps)
Iout-(Amps)
Ripple vs Output Current
Ripple vs Output Current
120
100
80
60
40
20
0
120
100
80
60
40
20
0
Vin
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
26.0V
20.0V
15.0V
10.0V
9.0V
0
0.5
1
1.5
2
0
0.5
1
1.5
2
Iout-(Amps)
Iout-(Amps)
Thermal Derating (Ta)
(See Note 2)
Thermal Derating (Ta)
(See Note 2)
2
2
1.8
1.6
1.4
1.2
1
50°C
60°C
50°C
60°C
70°C
1.8
1.6
1.4
1.2
1
70°C
85°C
85°C
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
9
12
15
18
21
24
27
30
9
12
15
18
21
24
27
30
Vin-(Volts)
Vin-(Volts)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
2.5
2
2.5
2
1.5
1
Vin
26.0V
20.0V
15.0V
10.0V
9.0V
1.5
1
Vin
28.0V
24.0V
18.0V
15.0V
12.0V
9.0V
0.5
0
0.5
0
0
0.5
1
1.5
2
0
0.5
1
1.5
2
Iout-(Amps)
Iout-(Amps)
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 Notes.)
17
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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