Data Sheet
March 2010
NH033x-L and NH050x-L Series Power Modules:
5 Vdc Input; 1.2 Vdc to 3.3 Vdc Output; 10 A and 15 A
Output Voltage Set-Point Adjustment
(Trim)
Feature Descriptions (continued)
Remote On/Off (continued)
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%.
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.
Connecting an external resistor (Rtrim-down) between the
TRIM and SENSE(+) pin decreases the output voltage
set point as defined in the following equation.
V
I
Vo
+
For the F (3.3 VO) module:
ON/OFF
V
V
switch
Ion/off
18.23
Rtrim-down = ----------------------------- – 47.2 kΩ
⎛
⎞
+
⎝
⎠
VO – VO, adj
on/off
GND
For the G (2.5 VO) module:
8-1175(C).a
6.98
VO – VO, adj
⎛
⎞
Rtrim-down = ----------------------------- – 24 kΩ
⎝
⎠
Figure 38. Remote On/Off Implementation
Note: Output voltages below 2.5 V cannot be trimmed
down.
Remote Sense
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.
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.
For the G (2.5 VO) module:
28
Rtrim-up = ----------------------------- – 10 kΩ
⎛
⎞
⎝
⎠
VO, adj – VO
For all other modules:
28
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.
⎛
⎞
Rtrim-up = ----------------------------- – 33.2 kΩ
⎝
⎠
VO, adj – VO
Leave the TRIM pin open if not using that feature.
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.
Overvoltage Protection
Overvoltage protection is not provided in the power
module. External circuitry is required to provide over-
voltage protection.
SENSE(+)
SENSE(-)
VI
VO
IO
II
GND
CONTACT AND
DISTRIBUTION LOSSES
CONTACT
RESISTANCE
SUPPLY
LOAD
8-651(C).i
Figure 39. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Lineage Power
13
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
