TLE 4305

Data Sheet

11

Rev. 2.1, 2004-01-01

Voltage Control Loop

Figure 6

Voltage Loop

The voltage loop regulator compares the input voltage

V

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

isolator. The control loop output voltage

V

regulator and the transformer close the loop.

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

Equation (5).

V

(3)

V

with

V

V

(5)

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

the internal 1 k

Ω 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.

AES02883

V-OTA

C

VCO

10 nF

VSE

Voltage Loop TLE 4305

Control

Logic

from Current Loop

1 k

Ω

R

VC

1 k

Ω

OUT

VCO

R

V2

Driver

R

V1

V

Q

V

REF