V48SH1R840NRFH datasheet(7/13 Pages) DELTA

Part #	V48SH1R840NRFH

Description	Delphi Series V48SH, 1/16th Brick 100W DC/DC Power Modules: 48V in, 1.8V, 40A out

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Manufacturer	DELTA [Delta Electronics, Inc.]

Direct Link	http://www.deltaww.com

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DS_V48SH1R840_05162011

7

FEATURES DESCRIPTIONS

Over-Current Protection

The modules include an internal output over-current

protection circuit, which will endure current limiting for an

unlimited duration during output overload. If the output

current exceeds the OCP set point, the modules will

automatically shut down, and enter hiccup mode or latch

mode, which is optional.

For hiccup mode, the module will try to restart after

shutdown. If the over current condition still exists, the

module will shut down again. This restart trial will continue

until the over-current condition is corrected.

For latch mode, the module will latch off once it shutdown.

The latch is reset by either cycling the input power or by

toggling the on/off signal for one second.

Over-Voltage Protection

The modules include an internal output over-voltage

protection circuit, which monitors the voltage on the

output terminals. If this voltage exceeds the over-voltage

set point, the module will shut down, and enter in hiccup

mode or latch mode, which is optional.

For hiccup mode, the module will try to restart after

shutdown. If the over voltage condition still exists, the

module will shut down again. This restart trial will continue

until the over-voltage condition is corrected.

For latch mode, the module will latch off once it shutdown.

The latch is reset by either cycling the input power or by

toggling the on/off signal for one second.

Over-Temperature Protection

The over-temperature protection consists of circuitry that

provides protection from thermal damage. If the

temperature exceeds the over-temperature threshold the

module will shut down, and enter in auto-restart mode or

latch mode, which is optional.

For auto-restart mode, the module will monitor the module

temperature after shutdown. Once the temperature is

dropped and within the specification, the module will be

auto-restart.

For latch mode, the module will latch off once it shutdown.

The latch is reset by either cycling the input power or by

toggling the on/off signal for one second.

Remote On/Off

The remote on/off feature on the module can be 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.

Remote on/off can be controlled by an external switch

between the on/off terminal and the Vi(-) terminal. The

switch can be an open collector or open drain.

For negative logic if the remote on/off feature is not used,

please short the on/off pin to Vi(-). For positive logic if the

remote on/off feature is not used, please leave the on/off

pin floating.

Vo(+)

Vi(+)

Vo(-)

Sense(-)

Sense(+)

Vi(-)

ON/OFF

Figure 15: Remote on/off implementation

Remote Sense

Remote sense compensates for voltage drops on the

output by sensing the actual output voltage at the point

of load. The voltage between the remote sense pins and

the output terminals must not exceed the output voltage

sense range given here:

[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout

This limit includes any increase in voltage due to remote

sense compensation and output voltage set point

adjustment (trim).

Vi(-)

Vi(+)

Vo(-)

Vo(+)

Sense(+)

Sense(-)

Resistance

Contact

Contact and Distribution

Losses

Figure 16: Effective circuit configuration for remote sense

operation

If the remote sense feature is not used to regulate the

output at the point of load, please connect SENSE(+) to

Vo(+) and SENSE(–) to Vo(–) at the module.

The output voltage can be increased by both the remote

sense and the trim; however, the maximum increase is

the larger of either the remote sense or the trim, not the

sum of both.

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