PT78NR200 Series
10-12W Plus to Minus Voltage
Integrated Switching Regulator
SLTS074A
(Revised 6/30/2000)
•
•
•
•
•
•
Negative output from positive input
Wide Input Range
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
Fast Transient Response
tive input voltage greater than 9V.
These easy-to-use, 3-terminal, Inte-
grated Switching Regulators (ISRs)
have maximum output power of 10 to
12 watts and a negative output voltage
that is laser trimmed. They also have
excellent line and load regulation.
The PT78NR200 requires 100
LFM of airflow at its maximum
output current.
The PT78NR200 series creates
negative output voltage from a posi-
Pin-Out Information
Ordering Information
PT78NR2 XX
Pin Function
Y
1
2
3
+V
in
Standard Application
-Vout
Output Voltage
Package Suffix
GND
52 = -5.2 Volts
06 = -6.0 Volts
12 = -12.0 Volts
15 = -15.0 Volts
H = Horizontal Mount
S = Surface Mount
V = Vertical Mount
Vin
-Vout
COM
1
2
PT78NR200
3
+
C2
C1
COM
+
(For dimensions and PC board layout, see
Package Styles 600 and 610.)
C1 = Required 100µF electrolytic
C2 = Required 100µF electrolytic
Pkg Style 600
Specifications
PT78NR200 SERIES
Characteristics
(Ta= 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
Vo= -5.2V
0.1*
0.1*
—
—
2.0
1.0
A
A
Vo= -12.0V
Short Circuit Current
Inrush Current
Isc
Vin=10V
—
4×Imax
—
Apk
Iir
tir
Vin=10V
—
—
4
—
—
A
On start-up
0.5
mSec
Input Voltage Range
Vin
0.1 ≤ Io ≤ Imax
9
—
15
V
Output Voltage Tolerance
∆Vo
Over Vin range
—
1.0
3.0
%Vo
Ta= 0°C to +70°C
Over Vin range
0.3 ≤ Io ≤ Imax
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Regload
Vn
—
—
—
0.5
0.5
2
1.0
1.0
—
%Vo
%Vo
%Vo
Vin=10V, Io=Imax
Transient Response
(with 100µF output cap)
ttr
50% load change
Vo over/undershoot
—
—
100
5.0
250
—
µSec
%Vo
Efficiency
η
Vin=9V, Io=0.5×Imax, Vo=-12V
—
78
—
%
Switching Frequency
ƒo
Ta
Over Vin and Io ranges600
650
700
kHz
Absolute Maximum
Operating Temperaturte Range
100 LFM airflow
Over Vin and Io Ranges
0
0
—
—
+85
°C
°C
Recommended Operating
Temperature Range
Ta
100 LFM airflow
Over Vin and Io Ranges
+60**
Thermal Resistance
Storage Temperature
Mechanical Shock
θja
Ts
—
—
100 LFM airflow
—
—
35
—
°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
—
—
—
10
11
G’s
Weight
—
—
Grams
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The PT78NR200 series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends