TLE4305 データシートの表示（PDF） - Infineon Technologies

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TLE4305

Voltage-Current Regulator

Infineon Technologies 

TLE 4305

Voltage Control Loop

Voltage Loop TLE 4305

from Current Loop

VQ

RV1

VSE

V-OTA

RV2

VREF

Control

Logic

Driver

1 kΩ

OUT

RVC

1 kΩ

VCO

CVCO

10 nF

AES02883

Figure 6 Voltage Loop

The voltage loop regulator compares the input voltage VSE to a reference voltage Vref of

typical 2.5 V. The difference is attenuated and proportional current drives the opto

isolator. The control loop output voltage VQ, pin VSE, pin OUT, opto isolator, primary

regulator and the transformer close the loop.

To program an output voltage a divider is used. The resistors are chosen according to

Equation (5).

VVSE = Vref

(3)

VVSE = VQ × RV2 / (RV1 + RV2)

(4)

with Vref typical 2.5 V

VQ = VVSE × (RV1 + RV2) / RV2

(5)

To compensate the voltage loop a 10 nF capacitor should be connected to pin VCO. With

the internal 1 kΩ resistor it reduces the overall closed voltage loop’s bandwidth.

If the gain of the overall loop has to be adapted to the application’s needs, the output

capacitor can be modified accordingly.

Data Sheet

11

Rev. 2.2, 2008-11-17

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