DLV-2.5/7-1.8/7-D12N(2001) Просмотр технического описания (PDF) - DATEL Data Acquisition products

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Компоненты Описание

производитель

DLV-2.5/7-1.8/7-D12N
(Rev.:2001)

VOUT Combinations of 3.3/2.5/1.8/1.5/1.2 Volts 30 Watt, DC/DC Converters

DATEL Data Acquisition products  

DLV Series

30W, DUAL OUTPUT, MIXED-VOLTAGE DC/DC CONVERTERS

Physical

Dimensions

2" x 2" x 0.5" (50.8 x 50.8 x 12.7mm)

Case Material

Diallyl phthalate, UL94V-0 rated

Pin Material

Brass, solder coated

Weight:

TBD

Primary to Secondary Insulation Level Operational

➀ All models are specified with external TBD ceramic output capacitors.

➁ See Technical Notes/Graphs for details.

➂ Devices may be order with opposite polarity. See Part Number Suffixes and Technical Notes

for details.

➃ Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter

may cause permanent damage.

➄ Output noise may be further reduced with the installation of additional external output

capacitors. See Technical Notes.

➅ On/Off control is designed to be driven with open collector or by appropriate voltage

levels. Voltages must be referenced to the –Input (pin 2).

➆ Demonstrated MTBF available on request.

➇ Trim function for the higher of two voltages available with "T" suffix. See Part

Number Suffixes and Technical Notes for details.

Absolute Maximum Ratings

Input Voltage:

Continuous:

D12 Models

D2A Models

D48 Models

Transient (100msec): D12 Models

D24 Models

D48 Models

23 Volts

42 Volts

81 Volts

25 Volts

50 Volts

100 Volts

Input Reverse-Polarity Protection ➁

D12A Models

D24A Models

D48A Models

Input Current must be limited. TBD

minute duration. Fusing recommended.

6 Amps

4 Amps

2 Amps

Output Current ➁

Current limited. Devices can withstand

an indefinite output short circuit.

On/Off Control (Pin 4) Max. Voltages

Referenced to –Input (pin 2)

No Suffix

"N" Suffix

+VIN

+8 Volts

Sync Control (Pin 3) Max. Voltages

"S" Suffix

+5.7 Volts

Storage Temperature

–40 to +120°C

Lead Temperature (Soldering, 10 sec.) +300°C

These are stress ratings. Exposure of devices to any of these conditions may adversely

affect long-term reliability. Proper operation under conditions other than those listed in the

Performance/Functional Specifications Table is not implied, nor recommended.

TECHNICAL NOTES

On/Off Control

The primary-side, remote On/Off Control function (pin 4) can be specified to

operate with either positive or negative polarity. Positive polarity devices (no

suffix) are enabled when pin 4 is left open or pulled high (+TBDV to +TBDV

with respect to –Input). Positive polarity devices are disabled when pin 4 is

pulled low (0-0.8V with respect to –Input). Negative polarity devices are off

when pin 4 is high/open and on when pin 2 is pulled low.

For applications where power sequencing is critical, the DLV series can be

configured such that the On/Off Control pin will enable/disable only the higher

of the two output voltages. Contact DATEL for more information.

Trimming Output Voltages

These DLV converters have a trim capability (pins 9 & 5) that allow users

to independently adjust the output voltages ±5%. (Note: pin 5 is an option,

see ordering information.) Adjustments to the output voltages can be accom-

plished via a trim pot, Figure 2, or a single fixed resistor as shown in Figures

3 and 4. A single fixed resistor can increase or decrease the output voltage

depending on its connection. Fixed resistors should have absolute TCR's less

than 100ppm/°C to minimize sensitivity to changes in temperature.

A single resistor connected from the Trim pin 9 to +Output (pin 8), see Figure

3, will decrease the lower output voltage. A resistor connected from Trim pin 9

to Output Return (pin 7) will increase the lower output voltage. See Figure 4.

Similarly, the higher output voltage can be adjusted using a single resistor

connected from the Trim (pin 5) to +Output (pin 6) or to Output Return (pin

7). See Figures 3 and 4.

1

+INPUT

+3.3V TRIM * 5

6

+3.3V OUTPUT

2

–INPUT

3

SYNC *

4 ON/OFF

CONTROL

OUTPUT 7

RETURN

8

+2.5V OUTPUT

9

+2.5V TRIM

20kΩ

5-22

TURNS

+3.3V

LOAD

20kΩ

5-22

TURNS

+2.5V

LOAD

* OPTIONAL PIN

Figure 2. Trim Connections Using A Trim Pot

1 +INPUT

2

–INPUT

3

SYNC *

4 ON/OFF

CONTROL

5

+3.3V TRIM *

6

+3.3V OUTPUT

RTRIM DOWN

OUTPUT 7

RETURN

8

+2.5V OUTPUT

+3.3V

LOAD

+2.5V

LOAD

9

+2.5V TRIM

RTRIM DOWN

* OPTIONAL PIN

Figure 3. Trim Connections To Decrease Output Voltages Using Fixed Resistors

3.3 Volt Trim Down

LN RTDOWN (kΩ) =

3.48(VO – 1.577)

3.3 – VO

–28.7

2.5 Volt Trim Down

LN RTDOWN (kΩ) =

2.41(VO – 1.18)

2.5 – VO

–19.7

1.8 Volt Trim Down

LN RTDOWN (kΩ) =

1.73(VO – 0.86)

1.8 – VO

–14.17

4

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