TLE 4305

Data Sheet

13

Rev. 2.1, 2004-01-01

Figure 8

Improved Current Control Loop

The calculation of the current is identical to the above calculation (Equation (6)). The

voltage at resistor

R

R

Supply of the TLE 4305

The TLE 4305 is an active circuitry and requires a supply voltage at pin

V

up of the supply, there is no energy stored in the load capacitor. Dependent on the

required output voltage also during operation the output voltage might be too small.

Therefore a second transformer-winding n3 is required. The voltage charges the input

capacitor

C

above 8 V a preregulated 6 V internal rail. The device generates biasing currents and

reference voltages from this rail.

To avoid Ground and

V

as well as all

V

If the application requires more than one voltage linear post-regulators can be used. In

the application a choke should be placed in series. An electrolyte or tantalum capacitor

of 10

µF to 100 µF should be used in parallel to a 10 to 100 nF ceramic capacitor to filter

high frequency noise. The size of the choke and the capacitors depend on the

application requirements.

AES02881

C-OTA

R

I1

25 k

Ω

C

CCO

10 nF

V

REF

CSE

CRE

Current Loop TLE 4305

Control

Logic

from Voltage Loop

1 k

Ω

R

CC

1 k

Ω

OUT

CCO

R

I1

25 k

Ω

R

CRE

10 k

Ω

C

CRE

100 nF

V

Q

R

Sense

D2

Driver