TLE4305 Datasheet, PDF (10/15 Pages) Infineon Technologies AG – Voltage-Current Regulator

TLE 4305
The TLE 4305 includes an independent voltage control and current control loop. The
internal schematic is shown in Figure 2. For I_Q < I_Qmax the voltage control gets priority.
If the supply operates in the overcurrent protection mode, the current loop is active and
reduces the output voltage with constant output current I_Qmax. The output voltage/output
current curve is shown in Figure 5.
Both the current control loop and the voltage control loop are temperature compensated.
V_Q
Voltage Regulator Active
V_Q
Cross Over
Current Regulator Active
I_Qmax
I_Q
AED02882
Figure 5 Current and Voltage Limit
The voltage or current loop regulator result defines the current into the opto isolator to
control the PWM duty cycle. The LED driver is fully integrated, no external components
are required.
Data Sheet
10
Rev. 2.1, 2004-01-01