TLD5095EL Datasheet, PDF (17/31 Pages) Infineon Technologies AG – DC/DC Boost, Buck-Boost, SEPIC controller

TLD5095EL
Linear Regulator
8
Linear Regulator
8.1
Description
The internal linear voltage regulator supplies the internal gate drivers with a typical voltage of 5 V and current up
to 50 mA. An external output capacitor with low ESR is required on pin IVCC for stability and buffering transient
load currents. During normal operation the external boost and dimming MOSFET switches will draw transient
currents from the linear regulator and its output capacitor. Proper sizing of the output capacitor must be considered
to supply sufficient peak current to the gate of the external MOSFET switches.
Integrated undervoltage protection for the external switching MOSFET:
An integrated undervoltage reset threshold circuit monitors the linear regulator output voltage (V_IVCC) and resets
the device in case the output voltage falls below the IVCC undervoltage reset switch OFF threshold (V_IVCC,RTH,d).
The undervoltage reset threshold for the IVCC pin helps to protect the external switches from excessive power
dissipation by ensuring the gate drive voltage is sufficient to enhance the gate of an external logic level n-channel
MOSFET.
IN
14
IVCC
1
Linear Regulator
EN / PWMI
13
Gate
Drivers
LinReg_BlckDiag.vsd
Figure 8 Voltage Regulator Block Diagram and Simplified Application Circuit
Datasheet
17
Rev. 1.1, 2009-12-16