PT78NR100 Datasheet, PDF (1/3 Pages) Texas Instruments – 1 AMP PLUS TO MINUS VOLTAGE INTEGRATED SWITCHING REGULATOR

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PT78NR100 S e r i e s
1 AMP PLUS TO MINUS VOLTAGE
INTEGRATED SWITCHING REGULATOR
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
• Negative output from positive input
• Wide Input Range
• Self-Contained Inductor
• Short Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
The PT78NR100 Series creates a
negative output voltage from a positive
input voltage greater than 7V. These
easy-to-use, 3-terminal, Integrated
Switching Regulators (ISRs) have
maximum output power of 5 watts and
a negative output voltage that is laser
trimmed. They also have excellent line
and load regulation.
Standard Application
Vin
C1
COM
1 _PT78NR100 2
+
3
C2
-Vout
+
COM
C1 = Required 100µF electrolytic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin Function
1
+V_in
2
-V_out
3 GND
Ordering Information
PT78NR1 XX Y
Output Voltage
03 = -3.0 Volts
05 = -5.0 Volts
52 = -5.2 Volts
07 = -7.0 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
Specifications
Pkg Style 500
Characteristics
(T_a= 25°C unless noted)
Symbols
Conditions
Output Current
Io
Short Circuit Current
I_sc
Inrush Current
Iir
t_ir
Input Voltage Range
Vin
Output Voltage Tolerance
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperaturte Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
∆Vo
Regline
Reg_load
Vn
ttr
η
ƒ_o
Ta
T_a
θ_ja
T_s
—
Over Vin range
Vo=-5V
Vo=-7, -8, -9V
V_o=-12V
Vo=-15V
V_in=10V
Vin=10V
On start-up
0.1 ≤ Io ≤ Imax
Vo=-5V
V_o=-7, -8, -9V
Vo=-12V
Vo=-15V
Over Vin range
Ta=-20°C to +70°C
Over Vin range
0.1 ≤ I_o ≤ I_max
Vin=10V, Io=Imax
50% load change
Vo over/undershoot
Vin=10V, Io=0.5×Imax, Vo = -5V
Over V_in and I_o ranges
Free Air Convection, (40-60LFM)
Over V_in and I_o Ranges
Free Air Convection, (40-60LFM)
Over Vin and Io Ranges
Free Air Convection, (40-60LFM)
—
Per Mil-STD-883D, Method 2002.3
Mechanical Vibration
—
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
Weight
—
—
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The PT78NR100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
PT78NR100 SERIES
Min
Typ
0.05*
0.05*
0.05*
0.05*
—
—
—
7
7
7
7
—
—
—
—
4×I_max
4
0.5
—
—
—
—
—
±1.0
—
±0.5
—
±0.5
—
±2
—
100
—
5.0
—
75
600
650
-40
—
-40
—
—
45
-40
—
—
500
—
5
—
6.5
Max
1.00
0.55
0.40
0.30
—
—
—
25
21
18
15
±3.0
±1.0
±1.0
—
250
—
—
700
+85
+60**
—
+125
—
—
Units
A
A
A
A
Apk
A
mSec
V
V
V
V
%Vo
%Vo
%V_o
%Vo
µSec
%Vo
%
kHz
°C
°C
°C/W
°C
G’s
G’s
Grams
14
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