Texas Instruments PT78NR103V, PT78NR105H, PT78NR105S, PT78NR105V, PT78NR107H Datasheet

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PT78NR100

Series

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.

Pin-Out Information

Pin Function

1+V

Standard Application

Vin

C1

1

PT78NR100

+

C1 = Required 100µF electrolytic
C2 = Required 100µF electrolytic

3

-Vout

2

C2

+

COMCOM

Specifications

Characteristics
(Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units

Output Current I

Short Circuit Current I
Inrush Current I

Input Voltage Range V

Output Voltage Tolerance ∆V

Line Regulation Reg
Load Regulation Reg
V

Ripple/Noise V

o

Transient Response t
(with 100µF output cap) Vo over/undershoot — 5.0 — %V

Efficiency η Vin=10V, Io=0.5×I
Switching Frequency ƒ
Absolute Maximum T

Operating Temperaturte Range Over Vin and Io Ranges
Recommended Operating T

Temperature Range Over Vin and Io Ranges
Thermal Resistance θ
Storage Temperature T
Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s
Mechanical Vibration — Per Mil-STD-883D, Method 2007.2,

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.

o

sc

ir

t

ir

in

o

line

load

n

tr

o

a

a

ja

s

Over Vin range Vo=-5V 0.05* — 1.00 A

Vin=10V — 4×I
Vin=10V — 4 — A

On start-up — 0.5 — mSec

0.1 ≤ Io ≤ I

Over Vin range
Ta=-20°C to +70°C

Over Vin range — ±0.5 ±1.0 %V

0.1 ≤ Io ≤ I
Vin=10V, Io=I
50% load change — 100 250 µSec

Over Vin and Io ranges 600 650 700 kHz
Free Air Convection, (40-60LFM)

Free Air Convection, (40-60LFM)

Free Air Convection, (40-60LFM) — 45 — °C/W
— -40 — +125 °C

20-2000 Hz, soldered in a PC board

in

2-V

out

3 GND

Pkg Style 500

=-7, -8, -9V 0.05* — 0.55 A

V

o

=-12V 0.05* — 0.40 A

V

o

Vo=-15V 0.05* — 0.30 A

=-5V 7 — 25 V

maxVo

=-7, -8, -9V 7 — 21 V

V

o

V

=-12V 7 — 18 V

o

Vo=-15V 7 — 15 V

max

max

= -5V — 75 — %

max, Vo

Ordering Information

PT78NR1

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

PT78NR100 SERIES

— ±1.0 ±3.0 %V

— ±0.5 ±1.0 %V
—±2—%V

-40 — +85 °C

-40 — +60** °C

—5

max

XX Y

Package Suffix

V = Vertical Mount
S = Surface Mount
H = Horizontal

Mount

— Apk

—

o

o

o

o

o

G’s

14

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

For assistance or to order, call [phone]

PT78NR100 Series

CHARACTERISTIC DATA

PT78NR105 -5.0 VDC (See Note 1) PT78NR109 -9.0 VDC (See Note 1) PT78NR112 -12.0 VDC (See Note 1)

Wide Input Range Products

DATA SHEETS

Efficiency vs Output Current Efficiency vs Output Current

100

90

80

70

60

Efficiency - %Ripple-(mV)Iout-(Amps)PD-(Watts)

50

40

0 0.2 0.4 0.6 0.8 1

Iout-(Amps)

Vin

7.0V

12.0V

15.0V

20.0V

25.0V

100

90

80

70

Efficiency - %

60

50

40

0 0.1 0.2 0.3 0.4 0.5

Iout-(Amps)

Ripple vs Output Current

200

160

120

80

40

0

0 0.2 0.4 0.6 0.8 1

Iout-(Amps)

Vin

25.0V

20.0V

15.0V

12.0V

7.0V

200

160

120

80

Ripple-(mV)

40

0

0 0.1 0.2 0.3 0.4 0.5

Iout-(Amps)

Thermal Derating (Ta) (See Note 2) Thermal Derating (Ta) (See Note 2)

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

7 101316192225

85°C

60°C

70°C

Vin-(Volts) Vin-(Volts)Vin-(Volts)

0.6

0.5

0.4

0.3

Iout-(Amps)

0.2

0.1

0

7 111519

85°C

70°C

Efficiency vs Output Current

100

90

Vin

7.0V

12.0V

15.0V

18.0V

21.0V

80

70

60

Efficiency - %

50

40

0 0.1 0.2 0.3 0.4

Vin

7.0V

9.0V

12.0V

15.0V

20.0V

Iout-(Amps)

Ripple vs Output CurrentRipple vs Output Current

250

Vin

21.0V

18.0V

15.0V

12.0V

7.0V

200

150

100

Ripple-(mV)Iout-(Amps)

50

0

0 0.1 0.2 0.3 0.4

Vin

20.0V

15.0V

12.0V

9.0V

7.0V

Iout-(Amps)

Thermal Derating (Ta) (See Note 2)

0.4

0.35

0.3

0.25

0.2

0.15

0.1

0.05

0

7 10131619

70°C

85°C

Power Dissipation vs Output Current

1.6

1.4

1.2

1

0.8

0.6

PD-(Watts)

0.4

0.2

0

0 0.1 0.2 0.3 0.4

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

0 0.2 0.4 0.6 0.8 1

Vin

25.0V

20.0V

15.0V

12.0V

7.0V

Power Dissipation vs Output CurrentPower Dissipation vs Output Current

1.6

1.4

1.2

1

0.8

0.6

PD-(Watts)

0.4

0.2

0

0 0.1 0.2 0.3 0.4 0.5

Vin

21.0V

18.0V

15.0V

12.0V

7.0V

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. (See Thermal Application Notes.)

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

Vin

20.0V

15.0V

12.0V

9.0V

7.0V

15