TEXAS INSTRUMENTS PT6640 Technical data

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PT6640 Series

24W 12V Input Positive to Negative
Voltage Converter

Standard Application

V

COM

IN

4,5,6

+

C

1

C1 = Required 560µF electrolytic
C

= Required 330µF electrolytic

2

PT6640

11,12,13

1

7,8,9,10

C

2

REMOTE SENSE

SLTS037A

(Revised 6/30/2000)

• Wide Input Voltage Range:

+8V to +25V

• Negative Output:

–2.5V/4A to –15V/1.5A

• Adjustable Output Voltage

• 85% Efficiency

• Remote Sense Capability

Pin-Out Information

1 Remote Sense
2 Do Not Connect
3 Do Not Connect
4+V

-V

OUT

+

LOAD

COM

10 –V
11 GND
12 GND
13 GND
14 V

in

5+V

in

6+V

in

7 –V

out

8 –V

out

9 –V

out

out

Adjust

out

Ordering Information

PT6641 = –3.3 Volts
PT6642 = –5.0 Volts
PT6643 = –12.0 Volts
PT6644 = –9.0 Volts
PT6645 = –15.0 Volts
PT6646 = –2.5 Volts

PT6640

The PT6640 series is a positive
input to negative output line of
Integrated Switching Regulators
(ISRs). Designed for general purpose
applications, the PT6640 series deliv­ers a negative output voltage at up
to 24W. The PT6640 is packaged in
a 14-Pin SIP (Single In-line Package)
and is available in a surface-mount
configuration.

Pkg Style 400

PT Series Suffix

Case/Pin Heat
Configuration Spreader

Vertical Through-Hole

Horizontal Through-Hole

Horizontal Surface Mount

Note: Back surface
of product is
conducting metal

(PT1234X)

P

D

E

Specifications

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

Output Current I

Input Voltage Range V

Output Voltage Tolerance ∆V

Output Voltage Adjust Range V

Line Regulation Reg

Load Regulation Reg

Vo Ripple/Noise V

Transient Response t
with C2 = 330µF V

o

in

o

oadj

line

load

n

tr

os

Efficiency η V

Ta = 60°C, 200 LFM, pkg P 0.1 — (See Note 2)
Ta = 25°C, natural convection V

0.1A ≤ Io ≤ I

Over V
Ta = -40°C to +65°C

max Vo = –2.5V/3.3V +8 — +27

o

range

in

Pin 14 to Vo or ground Vo = – 2.5V –1.8 — –4.3

+9V≤Vin≤+V

V

= +12V, 0.1≤ Io≤I

in

V

= +12V, Io = I

in

Io step between 0.5xIomax and Iomax — 200 — µSec
Vo over/undershoot — 100 — mV

= +12V, Io = 0.5x Iomax Vo = – 2.5V — 75 —

in

V

= +12V, Io = Iomax Vo = – 2.5V — 74 —

in

max, Io = Iomax — ±0.5 ±1.0 %V

in

max — ±0.5 ±1.0 %V

o

max — 3.0 — %V

o

Vo = –9.0/12.0/15.0V — 84 —

≤– 5.0V 0.1 — 4.0

o

V

= – 9.0V 0.1 — 2.5

o

V

= – 12.0V 0.1 — 2.0

o

Vo= – 15.0V 0.1 — 1.5

= – 5.0V +8 — +25

V

o

V

= – 9.0V +8 — +21 V

o

V

= – 12.0V +8 — +18

o

Vo = – 15.0V +8 — +15

= – 3.3V –2.2 — –4.7

V

o

V

= – 5.0V –3.0 — –6.5

o

= – 9.0V –6.0 — –10.2

V

o

V

= –12.0V –9.0 — –13.6

o

Vo = –15.0V –10.0 — –17.0

V

= – 3.3V — 79 —

o

= – 5.0V — 83 — %

V

o

V

= –9.0/12.0V — 85 —

o

Vo = –15.0V — 84 —

V

= – 3.3V — 77 —

o

V

= – 5.0V — 80 —

o

PT6640 SERIES

o-0.1 — Vo+0.1 V

V

Continued

A

V

o

o

o

%

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

PT6640 Series

24W 12V Input Positive to Negative
Voltage Converter

Specifications

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

Switching Frequency ƒ

Absolute Maximum T
Operating Temperature Range

Storage Temperature T

(continued)

PT6640 SERIES

o

a

s

+9V ≤ V
Over Io range

Over V

— -40 — +125 °C

in

≤ V

in

range

in

max

500 550 600 kHz

-40 — +85

(2)

Mechanical Shock — 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

— 7.5 — G’s

Weight — — — 14 — grams

Notes:

(1) The PT6640 Series requires a 330µF(output) and 560µF(input) electrolytic capacitors for proper operation in all applications.
(2) See Safe Operating Area curves or call the factory for guidance on thermal derating.

TYPICAL CHARACTERISTICS

Characteristic Curves @12.0V Vin (See Note A) Safe Operating Area Curves (See Note B)

Efficiency vs Output Current

90.0

85.0

80.0

75.0

Efficiency (%)

70.0

65.0

60.0

00.511.522.533.54

Output Current (A)

PT6643
PT6642
PT6641
PT6646

PT6642, @Vin =12V

90.0

80.0

70.0

60.0

50.0

40.0

Ambient Temperature ( C)

30.0

20.0

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Output Current (A)

Airflow

200LFM
120LFM
60LFM
Nat conv

°C

Ripple vs Output Current

150

125

100

75

Ripple (mV)

50

25

0

00.511.522.533.54

Power Dissipation vs Output Current

6

5

4

3

PDiss (Watts)

2

1

0

00.511.522.533.54

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

Output Current (A)

Output Current (A)

PT6645
PT6643
PT6644
PT6642
PT6641
PT6646

PT6645
PT6643
PT6644
PT6642
PT6641
PT6646

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

Application Notes

PT6640 Series

Adjusting the Output Voltage of the PT6640 24W
Positive to Negative ISR Series

The negative output voltage of the Power Trends
PT6640 series ISRs may be adjusted higher or lower than
the factory trimmed pre-set voltage with the addition of a
single external resistor. Table 1 gives the allowable ad­justment range for each model in the series as V
and Va (max).

Adjust Up: An increase in the negative output
voltage is obtained by adding a resistor R2, between pin

adjust) and pins 7-10 (-V

14 (V

o

).

out

Adjust Down: Adding a resistor (R1), between pin 14

adjust) and pins 11-13 (GND), decreases the output

(V

o

voltage magnitude.

Refer to Figure 1 and Table 2 for both the placement and
value of the required resistor, either (R1) or R2 as appro­priate.

Notes:

1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.

2. Never connect capacitors from V

, or the Remote Sense pin. Any capacitance added to

V

out

adjust pin will affect the stability of the ISR.

the V

3. If the Remote Sense feature is being used, connecting the

o

resistor (R1) between pin 14 (V
Sense) can benefit load regulation.

4. The maximum allowed input voltage (V
V

is adjusted. The difference between the input voltage

out

) and the output voltage (V

(V

in

10 × V

formulas to determine the maximum allowed input voltage

, whichever is less. Use one of the following

out

adjust to either GND,

o

adjust) and pin 1 (Remote

o

in

) must not exceed 30V or

out

for the PT6640.

V

 greater than 2.73V,

out

(max) = 30 – V

V

in

For example, if V

V

(max) = 30 – -12 = 18Vdc

in

= -12V,

out

 Vdc

out

(min)

a

) will change as

Figure 1

+V

in

C

in

560µF

4,5,6

+V in V out

PT6640

GND V

+

7,8,9,10

(adj)SNS(+)

o

1

1411,12,13

R2

| Up

|-V

(R1)
|-V

o

| Down

o

+

C

out

330µF

V

L

O

A

D

COMCOM

The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.

(R1) =

R2 =

Ro (Vo – 1.25)(Va – 1.25)

1.25 (V

Ro (Vo – 1.25)

- V

V

a

Where: Vo= Original V

= Adjusted V

V

a

= The resistance value in Table 1

R

o

= The series resistance from Table 1

R

s

– Va)

o

o

(magnitude)

out

(magnitude)

out

– R

– R

kΩ

s

s

kΩ

out

 less than 2.73V,

V

out

(max) = 10 × V

V

in

 Vdc

out

Table 1

PT6640 ADJUSTMENT AND FORMULA PARAMETERS

Series Pt # PT6646 PT6641 PT6642 PT6644 PT6643 PT6645

Vo (nom) –2.5V –3.3V –5.0V –9.0V –12.0V –15.0V

Va (min) –1.8V –2.2V –3.0V –6.0V –9.0V –10.0V

Va (max) –4.3V –4.7V –6.5V –10.2V –13.6V –17.0V

ΩΩ

Ro (k

Ω) 4.99 4.22 2.49 2.0 2.0 2.0

ΩΩ
ΩΩ

Rs (k

Ω) 2.49 4.99 4.99 12.7 12.7 12.7

ΩΩ

For technical support and more information, see inside back cover or visit www.ti.com/powertrends