TDK iQA Series manual Optional Tracking Trim

Advance Data Sheet: Dualeta™ iQA Series – Dual Quarter Brick

With a resistor between the trim and Vo (+)
terminals, the output voltage is adjusted up.
						Vo1(+)
To adjust the output voltage up a
percentage of Vout (%Vo) from Vo,nom the						Vo2(+)
trim resistor should be chosen according to
the following equation:						Trim
 3.01 Vonom ⋅(100 + %Vo)		−	301 + 4.01 ⋅(%Vo) 		⋅1000
Rup = 				
	1.225 ⋅(%Vo)		%Vo			RTN

Rup

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 rated 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.

Optional Tracking Trim

Vo1(+)

Vo2(+) Rdown

(Vo2,nom<2V)

Rdown

(Vo2,nom>=2V)

Trim

RTN

Circuit to decrease output voltage

With a resistor between the trim and Vo2(+) terminals, the output voltage is adjusted down. For models where the nominal set point of Vo2 is < 2V, the resistor is instead tied from trim to Vo1(+). Refer to the resistor selection tables in the Electrical Characteristics section for trim adjustment.

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

Circuit to increase output voltage

With a resistor between the Trim and RTN terminals, the output voltage is adjusted up. Refer to the resistor selection tables in the Electrical Characteristics section for trim adjustment.

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 rated 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.

EMC Considerations: Innoveta power modules are designed for use in a wide variety of systems and applications. For assistance with designing for EMC compliance, please contact 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 10-100uF input electrolytic capacitor should be present if the source inductance is greater than 4uH.

©2002-2005 TDK Innoveta Inc.	℡ (877) 498-0099	17/19
iQAFullDatasheet080505 2.doc 8/3/2006