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| TLD5045EJ_15 Datasheet, PDF (20/30 Pages) Infineon Technologies AG – 700mA High Integration - DC/DC Step-Down Converter | |||
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Infineon® LITIX⢠Power
TLD5045EJ
Open Load Diagnosis
7.4
Application with µC connected to TLD5045EJ IC
The ST pin can be connected directly to a µC input. During an open load condition the ST transistor is OFF. An
external pull up resistor connected to VDD is required to signal a logic high signal on the ST pin during an open
load error. Please consider that this diagnosis functionality is only active if the device is in active mode (HIGH
potential at the EN pin).
Refer to application drawing Figure 8-5.
VEN
High
Low
VPWMI
VPWMI,OFF
VPWMI,ON
VSW
SW - OFF
TPWMI
SW - ON
SW - OFF
Open Load
Event
ST
t
SW - ON
SW - OFF
t
High - z
t
Open Load
t
tOL
ST pull -down transistor ON
Figure 7-2 Open Load diagnosis via µC connected to ST pin
ST pull-down transistor OFF t
Data Sheet
20
Revision 1.0
2015-05-28
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