PT78NR103V
Texas Instruments PT78NR103V, PT78NR105H, PT78NR105S, PT78NR105V, PT78NR107H Datasheet
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14
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
PT78NR100
Series
Standard Application
C1 = Required 100µF electrolytic
C2
= Required 100µF electrolytic
Ordering Information
PT78NR1
Pin-Out Information
Pin Function
1+V
in
2-V
out
3 GND
• 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.
1 AMP PLUS TO MINUS VOLTAGE
INTEGRATED SWITCHING REGULATOR
PT78NR100
+
-Vout
COMCOM
Vin
1
3
2
C2
C1
+
Specifications
Characteristics
PT78NR100 SERIES
(T
a
= 25°C unless noted) Symbols Conditions Min Typ Max Units
Output Current I
o
Over V
in
range V
o
=-5V 0.05* — 1.00 A
V
o
=-7, -8, -9V 0.05* — 0.55 A
V
o
=-12V 0.05* — 0.40 A
V
o
=-15V 0.05* — 0.30 A
Short Circuit Current I
sc
V
in
=10V — 4×I
max
— Apk
Inrush Current I
ir
V
in
=10V — 4 — A
t
ir
On start-up — 0.5 — mSec
Input Voltage Range V
in
0.1 ≤ I
o
≤ I
max
V
o
=-5V 7 — 25 V
V
o
=-7, -8, -9V 7 — 21 V
V
o
=-12V 7 — 18 V
V
o
=-15V 7 — 15 V
Output Voltage Tolerance ∆V
o
Over V
in
range
— ±1.0 ±3.0 %V
o
T
a
=-20°C to +70°C
Line Regulation Reg
line
Over V
in
range — ±0.5 ±1.0 %V
o
Load Regulation Reg
load
0.1 ≤ I
o
≤ I
max
— ±0.5 ±1.0 %V
o
V
o
Ripple/Noise V
n
V
in
=10V, I
o
=I
max
—±2—%V
o
Transient Response t
tr
50% load change — 100 250 µSec
(with 100µF output cap) V
o
over/undershoot — 5.0 — %V
o
Efficiency η V
in
=10V, I
o
=0.5×I
max,
V
o
= -5V — 75 — %
Switching Frequency ƒ
o
Over V
in
and I
o
ranges 600 650 700 kHz
Absolute Maximum T
a
Free Air Convection, (40-60LFM)
-40 — +85 °C
Operating Temperaturte Range Over V
in
and I
o
Ranges
Recommended Operating T
a
Free Air Convection, (40-60LFM)
-40 — +60** °C
Temperature Range Over V
in
and I
o
Ranges
Thermal Resistance θ
ja
Free Air Convection, (40-60LFM) — 45 — °C/W
Storage Temperature T
s
— -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 — — — 6.5 Grams
*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.
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
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
Pkg Style 500
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