PT78SR112S [TI]
-1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR; -1.5 AMP负降压集成开关稳压器
| 型号： | PT78SR112S |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | -1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR |
| 文件： | 总3页 (文件大小：224K) |
| 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 9 S R 1 0 0 S e r i e s
-1.5 AMP NEGATIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 5/15/98
• High Efficiency > 85%
Regulators (ISRs). These ISRs have a
maximum output current of -1.5 Amps
and an output voltage that is laser
trimmed to most industry standard volt-
ages. They have excellent line and load
regulation, and are ideal for applications,
such as RS232 and Ethernet communica-
tions, ECL logic, and op-amp circuitry.
• Self-Contained Inductor
• Short Circuit Protection
• Over-Temperature Protection
The PT79SR100 Series is a new
line of Negative Input/Negative Out-
put 3-terminal Integrated Switching
Pin-Out Information
Ordering Information
PT79SR1
XX
Y
Pin Function
1
2
3
GND
-Vin
Output Voltage
Package Suffix
Standard Application
-Vout
05 = -5.0 Volts
52 = -5.2 Volts
08 = -8.0 Volts
09 = -9.0 Volts
12 = -12.0 Volts
15 = -15.0 Volts
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
COM
COM
-Vout
C1
D1
C2
1
-Vin
2
3
PT79SR1
C1 = Optional ceramic (1µF)
C2 = Optional ceramic (1-5µF)
D1 = Zener diode required to clamp
turn-on overshoot
(See Application Note)
Pkg Style 500
Specifications
PT79SR100 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Io
Conditions
Min
-0.1*
—
Typ
—
Max
-1.5
Units
A
Output Current
Over Vin range
Vin=Vo-4V
Short Circuit Current
Input Voltage Range
Isc
-3.5
—
Apk
Vin
Io=-0.1 to -1.5 A
-0.1 ≥ Io ≥ -1.5 A
Vo=-5V
Vo=-15V
-9
-19
—
—
-30
-30
V
V
Output Voltage Tolerance
∆Vo
Over Vin range, Io=-1.5 A
Ta=-20°C to shutdown
—
±1.0
±3.0
%Vo
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
Regline
Regload
Vn
Over Vin range
—
—
—
±1.0
±0.5
35
±2.0
±1.0
—
%Vo
%Vo
mVpp
-0.1 ≤ Io ≤ -1.5 A
Vin=-15V, Io=-1.0 A,Vo=-5V
ttr
50% load change
—
—
100
30
—
—
µSec
%Vo
Vo=overshoot/undershoot
Efficiency
η
Vin=-10V, Io=-1.0A, Vo=-5V
Over Vin and Io ranges
—
85
—
%
Switching Frequency
ƒo
Ta
0.95
1.0
1.05
MHz
Absolute Maximum
Operating Temperature Range
-40
-40
—
—
+85
°C
°C
Recommended Operating
Temperature Range
Ta
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
+60**
Thermal Resistance
Temperature Coefficient
Storage Temperature
Mechanical Shock
θja
Tc
Ts
—
—
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
—
—
45
—
°C/W
mV/°C
°C
—
±0.5
—
±1.5
+125
—
-40
—
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
—
—
7.0
—
Grams
* ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
22
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 9 S R 1 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
PT79SR105, -5.0 VDC (See Note 1)
PT79SR115, -15.0 VDC (See Note 1)
PT79SR112, -12.0 VDC (See Note 1)
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
100
90
80
70
60
50
40
100
90
80
70
60
50
40
100
90
80
70
60
50
40
Vin
Vin
9V
10.0V
15.0V
20.0V
25.0V
30.0V
Vin
19.0V
16.0V
21.0V
24.0V
27.0V
30.0V
20.0V
25.0V
30.0V
0
0.25 0.5 0.75
1
1.25 1.5
0
0.25 0.5 0.75
1
1.25 1.5
0
0.25 0.5 0.75
1
1.25
1.5
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Ripple vs Output Current
Ripple vs Output Current
Ripple vs Output Current
60
50
40
30
20
10
0
150
120
90
60
30
0
100
Vin
30.0V
Vin
80
60
40
20
Vin
30.0V
25.0V
20.0V
15.0V
10.0V
9V
30.0V
25.0V
20.0V
16.0V
27.0V
24.0V
21.0V
19.0V
0
0
0.25 0.5
0.75
1
1.25 1.5
0
0.25 0.5 0.75
1
1.25 1.5
0
0.25 0.5 0.75
1
1.25 1.5
Iout-(Amps)
Iout-(Amps)
Iout-(Amps)
Thermal Derating (Ta)
(See Note 2)
Thermal Derating (Ta)
(See Note 2)
Thermal Derating (Ta)
(See Note 2)
1.6
1.4
1.2
1
50˚C
60˚C
1.6
1.4
1.2
1
1.6
1.4
1.2
1
50˚C
60˚C
50˚C
60˚C
70˚C
70˚C
70˚C
85˚C
0.8
0.6
0.4
0.2
0
0.8
0.6
0.4
0.2
0
85˚C
0.8
0.6
0.4
0.2
0
85˚C
15
17
19
21
23
25
27
29
31
7
9
11 13 15 17 19 21 23 25 27 29 31
18
20
22
24
26
28
30
Vin-(Volts)
Vin-(Volts)
Vin-(Volts)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
Power Dissipation vs Output Current
2
1.5
1
2.5
2.5
2
Vin
30.0V
25.0V
20.0V
15.0V
10.0V
9V
Vin
Vin
30.0V
2
1.5
1
30.0V
27.0V
24.0V
21.0V
19.0V
1.5
1
25.0V
20.0V
16.0V
0.5
0
0.5
0
0.5
0
0
0.25
0.5 0.75
1
1.25
1.5
0
0.25 0.5 0.75
1
1.25 1.5
0
0.25 0.5 0.75
1
1.25 1.5
Iout-(Amps)
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 soldered in a printed circuit board. (See Thermal Application Notes.)
23
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
相关型号：
©2020 ICPDF网 联系我们和版权申明