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L99LD21 Datasheet(PDF) 17 Page - STMicroelectronics

Part # L99LD21
Description  High power LED driver for automotive applications
PDF  73 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99LD21 Datasheet(HTML) 17 Page - STMicroelectronics

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DS11130 Rev 5
17/73
L99LD21
Boost controller
72
The buck converters activation depends on device status (see Section 4.1: Operating
modes):
•
Active mode: in this case, bucks are immediately operative. Their status will depend on
DINMAP register configuration (see Section 4.2.1);
•
Limp Home:
–
we have to distinguish two different cases:
Boost Enabled with output voltage higher than 92.5% of final target value. In this
case, buck converters are immediately operative according to DIN_MAP register
configuration;
Boost Disabled or Enabled with output voltage lower than 92.5 % of final target
value. In this case, the buck converters are kept disabled for a specified time delay
(tDELAY) independently from DINMAP status. Once this time elapses, bucks are
operative according to DINMAP register configuration.
On the other hand, when boost and bucks are active and a VS undervoltage fault event
occurs, buck converters are immediately disabled while the boost is kept alive for tDELAY
before being switched off.



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