EQD075A1 datasheet(11/15 Pages) LINEAGEPOWER

Part #	EQD075A1

Description	18-60Vdc Input; 3.3 to 5.0Vdc Output; 75W

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Manufacturer	LINEAGEPOWER [Lineage Power Corporation]

Direct Link	http://www.lineagepower.com

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11 / 15 page

Data Sheet

March 25, 2008

EQD075 Series Single Output: Eighth Brick Power Modules:

18-60Vdc Input; 3.3 to 5.0Vdc Output; 75W

11

Feature Descriptions (continued)

Output Voltage Programming

The output voltage is adjustable between 3.0 to 5.5V

(A version). A resistor placed between the Trim pin

and Sense (+) increases the output voltage and a

resistor placed between the Trim pin and Sense (-)

decreases the output voltage. Figure 22 shows the

circuit configuration using an external resistor. The

trim resistor should be positioned close to the module.

If the trim pin is not used then the pin shall be left

open. If no trim resistor is connected, for the A

version, the output voltage will be 5V.

The following equations determine the required

external resistor value to obtain a percentage output

voltage change of Δ%.

To decrease output voltage set point:

Ω

⎟

⎠

⎞

⎜

⎝

⎛

−

Δ

=

−

K

R

down

trim

2

.

10

%

510

Where,

100

%

,

×

−

=

Δ

nom

o

desired

nom

o

V

Vdesired = Desired output voltage set point (V).

To increase the output voltage set point

(

)

Ω

⎟

⎠

⎞

⎜

⎝

⎛

−

Δ

−

Δ

+

=

−

K

V

R

nom

o

up

trim

2

.

10

%

510

%

*

225

.

1

%

100

*

1

.

5

,

Although the output voltage can be increased by both

the remote sense and by the trim, the maximum

increase for the output voltage is not the sum of both.

The maximum absolute increase in output voltage,

due to simultaneous remote sense and trim

increases, shall not exceed the larger of the specified

individual remote sense or trim maximum limits shown

in the Features Specifications table.

VO(+)

TRIM

VO(-)

Rtrim-down

LOAD

VIN(+)

ON/OFF

VIN(-)

Rtrim-up

SENSE (+)

SENSE (-)

Figure 22. Circuit Configuration to program output

voltage using an external resistor.

Pre-Bias Immunity

The modules are able to start into a pre-biased output

with a monotonic rise of the output voltage. During

shutdown an internal feature implemented in the

module ensures there will be no reverse current.

Thermal Considerations

Power modules operate in a variety of thermal

environments; however, sufficient cooling should be

provided to help ensure reliable operation.

Considerations include ambient temperature, airflow,

module power dissipation, and the need for increased

reliability. A reduction in the operating temperature of

the module will result in an increase in reliability. The

thermal data is based on physical measurements

taken in a wind tunnel. The test set-up is shown in

Figure 23.

The thermal reference point, Tref, used in the

specifications is shown in Figure 24. For reliable

operation, this temperature should not exceed 125

OC.

Please refer to the Application Note “Thermal

Characterization Process For Open-Frame Board-

Mounted Power Modules” for a detailed discussion of

thermal aspects including maximum device

temperatures.

Figure 24. Tref Temperature Measurement

Location.

Air

flow

x

Power Module

Wind Tunnel

PWBs

6.55_

(0.258)

76.2_

(3.0)

Probe Location

for measuring

airflow and

ambient

temperature

25.4_

(1.0)

Figure 23. Thermal Test Set up.

Tref

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