E48SD12020PRFB datasheet(11/27 Pages) DELTA

Part #	E48SD12020PRFB

Description	240W DC/DC Power Modules

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Manufacturer	DELTA [Delta Electronics, Inc.]

Direct Link	http://www.deltaww.com

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11 / 27 page

DS_E48SD12020_07042013

E-mail DCDC@delta.com.tw

http://www.deltaww.com/dcdc

P11

For the negative logic, if the remote ON/OFF

(ENABLE) feature is not used, please maintain the

ENABLE pin to Vin(-).

R

load

Vin+

ENABLE

Vin-

Vo+

Vo-

R

load

Vin+

ENABLE

Vin-

Vo+

Vo-

Figure 16: Remote ON/OFF (ENABLE) implementation

Secondary Remote On/Off

Reference to the Vo(-) terminal, there is a C2 pin. The

default configuration is set to PGOOD function. And

such pin can be reconfigured as secondary remote

on/off pin by the PMBus interface including either

negative or positive logic. Negative logic turns the

module on during a logic low and off during a logic

high. Positive logic turns the modules on during a logic

high and off during a logic low. The secondary remote

on/off can be controlled by an external switch between

the on/off terminal and the Vo(-) terminal. The switch

can be an open collector or open drain.

MFR_C1_C2_ARA_CONFIG,

MFR_

C2_LOGIC,

MFR_PGOOD_POLARITY are used to config C2 pin

function.

Remote Sense

Remote sense minimizes the effects of distribution

losses by regulating the voltage at the remote-sense

connections (See Figure 17). The SENSE(-) pin should

be always connected to VO(-) pin. The voltage between

the remote-sense pins and the output terminals must

not exceed the output voltage sense range given in the

Feature Specifications

[VO(+)

– VO(–)] – SENSE(+) ≤0.5 V

The output voltage can also be increased by the trim,

the maximum increase for the output voltage is the

sum of both. The amount of power delivered by the

module is defined as the voltage at the output

terminals multiplied by the output current. When using

remote sense and trim, the output voltage of the

module can be increased, which at the same output

current, would increase the power output of the

module. Care should be taken to ensure that the

maximum output power of the module remains at or

below the maximum rated power (Maximum rated

power = Vo,set x Io,max)

Vout(+)

Load

Input source

Vin(-)

Sense(-)

Sense(+)

Vout(-)

Vin(+)

Resistance of trace

Figure 17: Circuit Configuration for remote sense.

Configurable Control Pins

The module contains one configurable control pins C2,

referenced to the module secondary SIG_GND. See

Mechanical Views for pin locations. The following table

list the default factory configurations for the functions

assigned to the pin.

Designation/Function

Configuration

C2

Power Good

Factory Default

On/Off

Optional Vias PMBUS

Output Voltage Adjustment (TRIM)

note1

To increase or decrease the output voltage set point,

connect an external resistor between the TRIM pin

and either the Vo(+) or Vo(-). The TRIM pin should be

left open if this feature is not used.

Figure 18: Circuit configuration for trim-down (decrease

output voltage)

If the external resistor is connected between the

TRIM and Vo (-) pins, the output voltage set point

decreases (Fig. 18). The external resistor value

required to obtain a percentage of output voltage

change △% is defined as:





















K

down

Rtrim

2

.

10

511

_

Ex. When Trim-down -10% (11.7V×0.9=10.53V)



























K

down

Rtrim

9

.

40

2

.

10

511

_

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