TDK iHA48040A033V* specifications Rdown = 100% − 2 kΩ

Data Sheet: Veta® iHA48040A033V*, 3.3V/40A Output Half Brick Series

percentage of Vout (%Vo) from Vo,nom, the trim resistor should be chosen according to the following equation:

trimmed up, the maximum output current must be decreased to maintain the maximum rated power of the module.

Rdown = (100% − 2) kΩ

Δ down

where

Δdown = Vnom − Vdesired ⋅100% Vnom

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.

The current limit set point does not increase as the module is trimmed down, so the available output power is reduced.

Vout(+)

Sense(+)

Rup

Trim

Sense(-)

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:

	⎡V	nom		⎤
	⎢			− 2⎥ ⋅ (1 + Δ	up	) + 1
	⎢ V			⎥
Rup =	⎣		ref	⎦			kΩ
				Δ up

where

Δup = Vdesired − Vnom ⋅100% and

Vnom

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 for the power module of interest.

The maximum power available from the power module is fixed. As the output voltage is

Remote Sense: The 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 power terminals 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 output 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 must be decreased for the power module to remain below its maximum power rating.

EMC Considerations: TDK Innoveta power modules are designed for use in a wide variety 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 with the DC/DC converter. To minimize the interaction, a 200-1000uF input electrolytic capacitor should be present.

©2007 TDK Innoveta Inc.	' (877) 498-0099
iHA Datasheet 040207	15/17