NH033 datasheet(13/20 Pages) LINEAGEPOWER

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Data Sheet

NH033x-L and NH050x-L Series Power Modules:

March 2010

5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A

Lineage Power

Feature Descriptions (continued)

Remote On/Off (continued)

CAUTION: Never ground the ON/OFF pin. Ground-

ing the ON/OFF pin disables an impor-

tant safety feature and may damage the

module or the customer system.

8-1175(C).a

Figure 38. Remote On/Off Implementation

Remote Sense

Remote sense minimizes the effects of distribution

losses by regulating the voltage at the remote-sense

connections. The voltage between the remote-sense

pins and the output pins must not exceed the output

voltage sense range given in the Feature Specifications

table.

The voltage between the VO and GND pins must not

exceed 110% of VO, nom for VO

≥ 2.5 V or 120% of

VO, nom for VO < 2.5 V. This limit includes any increase

in voltage due to remote-sense compensation and out-

put voltage set-point adjustment (trim), see Figure 39.

If not using the remote-sense feature to regulate the out-

put at the point of load, connect SENSE(+) to VO and

SENSE(–) to GND at the module.

8-651(C).i

Figure 39. Effective Circuit Configuration for

Single-Module Remote-Sense Operation

Output Voltage Set-Point Adjustment

(Trim)

Output voltage set-point adjustment allows the output

voltage set point to be increased or decreased by con-

necting an external resistor between the TRIM pin and

either the SENSE(+) pin (decrease output voltage) or

SENSE(–) pin (increase output voltage). The trim

range for modules that produce 2.5 VO or greater is

±10% of VO, nom. The trim range for modules that pro-

duce less than 2.5 VO is +20%, –0%.

Connecting an external resistor (Rtrim-down) between the

TRIM and SENSE(+) pin decreases the output voltage

set point as defined in the following equation.

For the F (3.3 VO) module:

For the G (2.5 VO) module:

Note: Output voltages below 2.5 V cannot be trimmed

down.

Connecting an external resistor (Rtrim-up) between the

TRIM and SENSE(–) pins increases the output voltage

set point to VO, adj as defined in the following equation.

For the G (2.5 VO) module:

For all other modules:

Leave the TRIM pin open if not using that feature.

Overvoltage Protection

Overvoltage protection is not provided in the power

module. External circuitry is required to provide over-

voltage protection.

Ion/off

ON/OFF

GND

Von/off

Vswitch

SENSE(+)

SENSE(-)

CONTACT

AND

DISTRIBUTION LOSSES

CONTACT

RESISTANCE

GND

SUPPLY

LOAD

Rtrim-down

18.23

VO VO adj

–

------------------------------47.2

–

⎝⎠

⎛⎞ kΩ

Rtrim-down

6.98

VO VO adj

–

------------------------------24

–

⎝⎠

⎛⎞ kΩ

Rtrim-up

VO adj

–

------------------------------10

–

⎝⎠

⎛⎞ kΩ

Rtrim-up

VO adj

–

------------------------------33.2

–

⎝⎠

⎛⎞ kΩ

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