BD6079GWL Datasheet, PDF (16/41 Pages) Rohm – White LEDs Driver

BD6079GWL
Datasheet
˔Thermal shut down
BD6079GWL has thermal shut down function.
The thermal shut down starts working when temperature is 185°C or higher. While holding the setting of EN control from the
outside, DC/DC converter turns from operation mode into non operation mode. When temperature drops below 165°C, the
IC gets back into its normal operation.
185°C (Typ.)
165°C (Typ.)
Temperature
DC/DC
Current Driver
Active
Stop
Active
Figure 33. TSD protection function
˔Under Voltage Lockout (UVLO)
When Battery voltage (VIN) goes to under UVLO detection voltage (Min. : 1.8V), BD6079GWL will be stop to DC/DC and
Current Driver. Also, Battery voltage up to un-detection voltage (Max. : 2.2V) from UVLO detection point, this detection
function will be released.
VIN terminal
1.8V(Min.)
0V
2.2V(Max.)
DC/DC
Current Driver Active
reset
Active
Figure 34. UVLO protection function
Action by TSD / UVLO
DC/DC
Current Driver
LED Open/Short Information
N/B Information
“11ms Counter” (LED connection check)
“33ms Counter” (Shut down counter)
Soft Start
TSD
Stop
Goes to shutdown mode
Stop
Reset
Hold
Reset
Reset
Reset
UVLO
Stop
Goes to shutdown mode
Stop
Reset
Reset
Reset
Reset
Reset
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TSZ02201-0G3G0C200340-1-2
14.Mar.2013 Rev.001