Data Sheet: Xeta
iHG48070A033V, 3.3V/70A Output Half Brick Series
©2008 TDK Innoveta Inc.
iHG Datasheet 2008-05-15 Revision 1.1
℡
(877) 498
-
0099
14/16
With a resistor between the trim and Sense (-)
terminals, the output voltage is adjuste d down.
To adjust th e output voltage down a
percentage of Vout (%Vo) from Vo,nom, the
trim resistor should be chosen according to
the following equation:

)2

%100

(−

∆

=

down
down

R

kΩ
where

%100⋅

−

=∆

nom
desirednom
down

V

VV

The current limit set point does not increase
as the module is trimmed down, so the
available output power is reduced.
Sense(-)
Trim
Sense(+)
Vout(+)
Rup
Vout(-)
Circuit to increase output voltage
With a resistor between the trim and sense (+)
terminals, the output voltage is adjusted up.
To adjust the output voltage up a percentage
of Vout (%Vo) from Vo,nom the trim resistor
should be chosen according to the following
equation:
up
up
ref
nom
up
V
V
R∆+∆+⋅−=

1)1(2

k

Ω

where

%100

⋅
−
=∆
nom
nomdesired
up
V
VV
and
The value of Vref is found in the Electrical
Data section for the power module of interest.
Trim up and trim down curves are found in the
Electrical Characteristics section f or the power
module of interest.
The maximum power available from the power
module is fixed. As the output voltage is
trimmed up, the maximum output current must
be decreased to maintain the maximum r ated
power of the module.
As the output voltage is trimmed, the output
over-voltage set point is not adjusted.
Trimming the output voltage too high may
cause the output over voltage protection circuit
to be triggered.
Remote Sense: T he power modules feature
remote sense to compensate for the effect of
output distribution drops. The output voltage
sense range defines the maximum voltage
allowed between the output po wer term inals
and output sense terminals, and it is found on
the electrical data page for the power module
of interest. If the remote sense feature is not
being used, the Sense(+) terminal should be
connected to the Vo(+) terminal and the
Sense (-) terminal should be connected to the
Vo(-) terminal. The output voltage at the Vo(+)
and Vo(-) terminals can be increased by either
the remote sense or the output voltage
adjustment feature. The maximum voltage
increase allowed is the larger of the remote
sense range or the outp ut voltage adjustment
range; it is not the sum of both.
As the output voltage increases due to the use
of the remote sense, the maximum output
current m ust be decreased for the po wer
module to remain below its max power rating.
EMC Considerations:
TDK Innoveta power
modules are designed for use in a wide variet y
of systems and applications. For assistance
with designing for EMC compliance, please
contact TDK Innoveta technical support.
Input Impedance: The source impedance of
the power feeding the DC/DC converter
module will interact w ith the DC/DC converter.
To minimize the interaction, a 220-470uF input
electrolytic capacitor should be present.