TDK Powereta iQP48070A033 User Manual download pdf (Page 12)

Data Sheet: Powereta

TM

iQP Series –Single Output Quarter Brick

©2006 TDK Innoveta Inc.

iQP 3.3V/70A Datasheet 8/3/2006

℡

(

877

)

498-0099

12/15

Vin(-)

On/ Off

Vin (+)

On/Off Circuit for positive or negative logic

Output Voltage Adjustment: The output

voltage of the module may be adjusted by

using an external resistor connected

between the trim pin 6 and either the Sense

(+) or Sense (-) pin. If the voltage trim

feature is not used, pin 6 should be left

open. Care should be taken to avoid

injecting noise into the module’s trim pin. A

small 0.01uF capacitor between the power

module’s trim pin and Sense (-) pin may

help to avoid this.

With a resistor between the trim pin and

Sense (-) pin, the output voltage is adjusted

down. To adjust the output voltage down a

percentage of Vout (∆%) from Vo,nom, the

trim resistor should be chosen according to

the following equation:

)2

%

100

(11.5 −

∆

×=

down

R (kΩ)

Where

∆%=100×(Vo,nom - Vdesired) / Vo_nom

The current limit set point does not increase

as the module is trimmed down, so the

available output power is reduced.

Sense(+)

Vout(+)

Vout(-)

Rdown

Trim

Sense(-)

Circuit to decrease output voltage

10

100

1000

10000

0 2 4 6 8 101214161820

% Decrease in Output Voltage,

∆

(%)

Trim Resistance (k

Ω

)

With a resistor between the trim pin and

sense (+) pin, the output voltage is adjusted

up. To adjust the output voltage up a

percentage of Vout (∆%) from Vo,nom the

trim resistor (in kΩ) should be chosen

according to the following equation:

)2

%

100

%

%)100(

(11.5

,0

−

∆

−

∆×

∆+×

×=

Vref

V

R

nom

up

1 2 ... 7 8 9 10 11 12 13 14 15

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