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Giải thích chi tiết về linh kiện  Automotive low dropout linear voltage regulator with configurable output voltage having 200 mA current capability
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Figure 42. Undervoltage lockout on output voltage
VS
VO
VUVLO_rise
VUVLO_fall
4.11
Functional safety management
Even if not designed as safety HW element, the device contains some features that can be used to support
application that need to fulfill functional safety requirements. Analysis of the IC’s capability to reach the required
safety level, should be made at system level under user responsibility.
The following device safety requirements have been considered for a typical application:
Table 14. Safety requirement
ID
Description
SR-001
Operation of the voltage regulator(s) is allowed till over temperature limit.
SR-002
Operation of voltage regulator(s) is enabled until programmed current limit is
reached.
SR-003
Output voltage of regulator(s) shall remain within programmed range when RST pin
is not asserted.
SR-004
Output voltage of regulator(s) shall remain within programmed range when square
wave at TW pin is not generated.
Based on above requirements list the following safety mechanism has been implemented:
Table 15. Implemented safety mechanism
ID
Description
SR covered
SM1
Thermal sensor acting by TW pin
SR-004
SM2
Overtemperature protection
SR-001
SM3
Limitation on maximum output current
SR-002
SM4
Output voltage VO monitoring for
undervoltage detection
SR-002
SM5
Output voltage VO monitoring for
overvoltage detection
SR-002
L99VR01
Functional safety management
DS13649 - Rev 3
page 26/47



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