參數(shù)資料
型號(hào)： PT78SR108V
廠商： Texas Instruments, Inc.
英文描述： -1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
中文描述： -1.5放大器負(fù)降壓集成開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 1/3頁(yè)
文件大?。?/td> 222K
代理商： PT78SR108V
For assistance or to order, call (800) 531-5782
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
22
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
PT79SR100 Series
-1.5 AMP NEGATIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
High Efficiency > 85%
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
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.
PT79SR1
COM
-Vin
C1
1
23
C2
D1
-Vout
Pin-Out Information
Pin
Function
1
GND
2-Vin
3-Vout
Ordering Information
PT79SR1
XX
Y
Output Voltage
05
= -5.0 Volts
52
= -5.2 Volts
08
= -8.0 Volts
09
= -9.0 Volts
12
= -12.0 Volts
15
= -15.0 Volts
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
Standard Application
C1 = Optional ceramic (1F)
C2 = Optional ceramic (1-5F)
D1 = Zener diode required to clamp
turn-on overshoot
(See Application Note)
Specifications
Characteristics
PT79SR100 SERIES
(T
a = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
-0.1*
—
-1.5
A
Short Circuit Current
Isc
Vin=Vo-4V
—
-3.5
—
Apk
Input Voltage Range
Vin
Io=-0.1 to -1.5 A
Vo=-5V
-9
—
-30
V
-0.1
≥ Io ≥ -1.5 A
Vo=-15V
-19
—
-30
V
Output Voltage Tolerance
Vo
Over Vin range, Io=-1.5 A
—
±1.0
±3.0
%Vo
Ta=-20°C to shutdown
Line Regulation
Regline
Over Vin range
—
±1.0
±2.0
%Vo
Load Regulation
Regload
-0.1
≤ Io ≤ -1.5 A
—
±0.5
±1.0
%Vo
Vo Ripple/Noise
Vn
Vin=-15V, Io=-1.0 A,Vo=-5V
—
35
—
mVpp
Transient Response
ttr
50% load change
—
100
—
Sec
Vo=overshoot/undershoot
—
30
—
%Vo
Efficiency
η
Vin=-10V, Io=-1.0A, Vo=-5V
—
85
—
%
Switching Frequency
o
Over Vin and Io ranges
0.95
1.0
1.05
MHz
Absolute Maximum
Ta
-40
—
+85
°C
Operating Temperature Range
Recommended Operating
Ta
Free Air Convection, (40-60LFM)
-40
—
+60**
°C
Temperature Range
Over Vin and Io ranges
Thermal Resistance
θ
ja
Free Air Convection, (40-60LFM)
—
45
—
°C/W
Temperature Coefficient
Tc
Over Vin and Io ranges
—
±0.5
±1.5
mV/°C
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,
—5
—
G’s
20-2000 Hz, soldered in a PC board
Weight
—
7.0
—
Grams
* ISR will operate down to no load with reduced specifications.
** See Thermal Derating chart.
Pkg Style 500
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