TDK iEA Series manual 510

Data Sheet: Belleta® iEA Series –Single Output Eighth Brick

Vin	(+)
On/	Off
Vin(-)

On/Off Circuit for positive or negative logic

Output Voltage Adjustment: The output voltage of the power module may be adjusted by using an external resistor connected between the Vout trim terminal (pin 6) and either the Sense (+) or Sense (-) terminal. If the output voltage adjustment feature is not used, pin 6 should be left open. Care should be taken to avoid injecting noise into the power module’s trim pin. A small 0.01uF capacitor between the power module’s trim pin and Sense (-) pin may help avoid this.

Vout(+)

Sense(+)

Trim

Rdown

Sense(-)

Vout(-)

Circuit to decrease output voltage

With a resistor between the trim and Sense (-) terminals, the output voltage is adjusted down. To adjust the output voltage down a percentage of Vout (%Vo) from Vo,nom, the trim resistor should be chosen according to the following equation:

For all outputs except 1.2V:

	510	
Rdown := 		− 10.2	⋅1000
 %Vo		

For 1.2V output only:
 100	
Rdown := 	− 2	⋅1000
 %Vo	

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:

For all outputs except 1.2V:

5.1Vonom⋅(100 + %Vo)			510	
Rup := 		−		− 10.2	⋅1000
	Vref⋅%Vo		%Vo	

For 1.2V output only:
 100	
Rup := 		⋅1000
 %Vo 

The value of Vref is found in the Electrical Data section for 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 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.

©2004 TDK Innoveta® Inc.		￿ (877) 498-0099
iEAFullDatasheet 032707 3/29/2007	Revision 2.0	38/41