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TPS61300YFFR Datasheet(HTML) 28 Page - Texas Instruments
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TPS61305, TPS61305A, TPS61306
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
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Copyright © 2009–2016, Texas Instruments Incorporated
8.3.13 White LED Privacy Indicator
The TPS6130xx device features white LED drive capability at very low light intensity. To generate a reduced LED
average current, the device employs a 122-Hz fixed frequency PWM modulation scheme. Operation is
understood best by referring to the timer block diagram.
The DC light current is modulated with a duty cycle defined by the INDC[3:0] bits. The low light dimming mode
can only be activated in the software controlled DC light only mode (MODE_CTRL[1:0] = 01, ENVM = X,
ENDCL = 0) and applies to the LEDs selected through ENLED[3:1] bits. In this mode, the DC light safety timeout
feature is disabled.
Figure 41. PWM Dimming Principle
8.3.14 Storage Capacitor, Precharge Voltage Calibration
High-power LEDs tend to exhibit a wide forward voltage distribution. The TPS6130xx device integrates a self-
calibration procedure that can be used to determine the optimum super-capacitor precharge voltage based on
the actual worst case LED forward voltage and ESR of the storage capacitor. This calibration procedure is meant
to start-off at a minimum output voltage and can be initiated by setting the SELFCAL bit (preferably with
MODE_CTRL[1:0] = 00, ENVM = 0, ENDCL = 0).
The calibration procedure monitors the sense voltage across the low-side current regulators (according to
ENLED[3:1] bits setting) and registers the worst case LED (the LED featuring the largest forward voltage). The
TPS6130xx device automatically sweeps through its output voltage range and performs a short duration flash
strobe for each step (see REGISTER2 (TPS61300, TPS61301) or REGISTER2 (TPS61305, TPS61305A,
TPS61306) for FC13[1:0] and FC2[2:0] bits settings).
In direct drive mode (HC_SEL = L), the energy is being directly transferred from the battery to the LEDs. In high-
current mode (HC_SEL = H), the energy is supplied exclusively by the output reservoir capacitor and the
inductive power stage is turned off for the flash strobe period of time.
The sequence is stopped as soon as the device detects that each of the low-side current regulators have enough
headroom voltage (400-mV typical). The device returns the according output voltage in the register OV[3:0] and
sets the SELFCAL bit. This bit is only being reset at the or restart of a calibration cycle. In other words, when
SELFCAL is asserted the output voltage register (OV[3:0]) returns the result of the last calibration sequence.
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