TLD5190QV Datasheet, PDF (15/58 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller for High Power LED Lighting

H-Bridge DC/DC Controller
TLD5190QV
Power Supply
5
Power Supply
The TLD5190QV is supplied by the following pins:
• VIN (main supply voltage)
• IVCC_EXT (supply for internal gate driver stages)
The VIN supply provides internal supply voltages for the analog and digital blocks.
IVCC_EXT is the supply for the low side driver stages. This supply is used also to charge, through external
schottky diodes, the bootstrap capacitors which provide supply voltages to the high side driver stages. If no
external voltage is available this pin must be shorted to IVCC, which is the output of an internal 5V LDO.
The supply pins VIN and IVCC_EXT have undervoltage detections.
Undervoltage on IVCC_EXT or IVCC voltages forces a deactivation of the driver stages, thus stopping the
switching activity.
Moreover the double function pin EN/INUVLO can be used as an input undervoltage protection by placing a
resistor divider from VIN to GND (refer to Chapter 10.3).
If EN/INUVLO undervoltage is detected, it will turn-off the IVCC voltage regulator,and stop switching.
Figure 3 shows a basic concept drawing of the supply domains and interactions among pins VIN and
IVCC/IVCC_EXT.
VIN
R₁
EN/INUVLO
R₂
Internal pre-regulated
voltage Supply
VREG
analog
VREG (5V)
VREG
digital
Undervoltage
detection
LS - Drivers
Bandgap
Reference
LOGIC
Figure 3 Power Supply Concept Drawing
HS - Drivers
IVCC
IVCC_EXT
PGND
BSTx
SWNx
Data Sheet
15
Rev. 1.0, 2016-05-20