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TPS61300YFFR Datasheet(PDF) 29 Page - Texas Instruments

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No. de Pieza. TPS61300YFFR
Descripción  TPS6130xx 1.5-A and 4.1-A Multiple LED Camera Flash Driver With I2C Compatible Interface
Descarga  70 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61300YFFR Datasheet(HTML) 29 Page - Texas Instruments

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OutputVoltage, VOUT
PowerGood, PG
VBAT
LEDFlashCurrent, IFLASH
OV[3:0]
0000
0001
0010
0011
0100
0101
~200 ms
FeedbackSenseComparatorOutput
VLED > 400 mV
Self-Calibration,
SELFCAL bit (write)
Self-Calibration,
SELFCAL bit (read)
ESRxILED
~200 ms
FeedbackSense
ComparatorInformation
X
29
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
www.ti.com
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
Figure 42. LED Forward Voltage Self-Calibration Principle
8.3.15 Storage Capacitor, Adaptive Precharge Voltage
In high-power LED camera flash applications, the storage capacitor is supposed to be charged to an optimum
voltage level in order to:
Maintain sufficient headroom voltage across the LED current regulators for the entire strobe time.
Minimize the power dissipation in the device.
High-power LEDs tend to exhibit large dynamic forward voltage variation relating to own self-heating effects. In
addition, the energy storage capacitor (Electrochemical Double-Layer Capacitor or Super-Capacitor) also shows
a relatively large effective capacitance and ESR spread. The main factors contributing to these variations are:
Flash strobe duration
Temperature
Ageing effects
In practice, it normally becomes very challenging to compensate for all these variations and a worst-case design
would presumably be too pessimistic. As a consequence, designers would have to give up the benefits that come
with the Storage Capacitor, Precharge Voltage Calibration approach.
The TPS6130xx device offers the possibility of controlling the storage capacitor precharge voltage in a closed-
loop manner. The principle is to dynamically adjust the initial prevoltage to the minimum value, as required for
the particular components characteristic and operating conditions.
The reference criteria used to evaluate proper operation is the headroom voltage across the LED current
regulators. In case of a critical headroom voltage (VLED1-3) at the end of a flash strobe (n cycle), the precharge
voltage must be increased before the next capture sequence (n+1 cycle).


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