TLD5541-1QV Datasheet, PDF (46/82 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller with SPI Interface

H-Bridge DC/DC Controller with SPI Interface
TLD5541-1QV
Protection and Diagnostic Functions
10.2
Overvoltage, Open Load, Short circuit protection
The VFB pin measures the voltage on the application output and in accordance with the populated resistor divider,
short to ground, open load and overvoltage thresholds are set. Refer to Figure 28 and Figure 27 for more details.
V_FB
V_{FB_OVTH} = fixed
V_{FB_OL,rise} = fixed
Overvoltage
Open LOAD
Normal Operation
V_{FB_S2G} = adjustable
Short
Circuit
Figure 27
Threshold can be
adjusted via SPI
Definition of Protection Ranges
IVCC
BST1
BST2
HSGD1
SWN1
LSGD1
SWCS
SGND
PGND
LSGD2
SWN2
HSGD2
VFB
FBH
FBL
V_IN
D₁
C_IVCC
D₂
C_BST1 C_BST2
M₁
M₄
L_OUT
M₂
M₃
R_SWCS
e.g. 50V
V_OUT
C_OUT
RVFBH
R_VFBL
V_{VFB_OVTH}
V_{VFB_OL,rise}
V_{VFB_S2G}
Figure 28 VFB Protection Pin - Overview
10.2.1 Short Circuit protection
The device detects a short circuit if this condition is verified:
• The pin VFB falls below the threshold voltage V_{VFB_S2G} for at least 8 clock cycles
V_OUT
R_FB
Data Sheet
46
Rev. 1.0, 2016-05-20