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TPS61300YFFR Datasheet(PDF) 31 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) 31 Page - Texas Instruments

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LED
CURRENT
Time
t
RISE
I
STEP
t
FALL
31
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
Device Functional Modes (continued)
The TPS6130xx device uses a control architecture that allows to recycle excessive energy that might be stored
in the output capacitor. By reversing the operation of the boost power stage, the converter is capable of
transferring energy from its output back into the input source.
In high-current mode (HC_SEL = 1), this feature becomes useful to dynamically adjust the output voltage (VOUT)
depending on the operating conditions. For example, 4.95-V constant output voltage to support audio
applications or variable storage capacitor precharge voltage. See Storage Capacitor, Precharge Voltage
Calibration for more information.
Notice that this reverse operating mode can only perform within an output voltage range higher than the input
supply. For example, if the storage capacitor is initially precharged to 4.95 V, the input voltage is around 4.1 V
and the target output voltage is set to 3.825 V, the converter will only be able to lower the output node down to
the input level.
8.4.2 LED High-Current Regulators, Unused Inputs
The TPS6130xx device uses LED forward voltage sensing circuitry on LED1-3 pins to optimize the power stage
boost ratio for maximum efficiency. TI recommends not to leave any of the LED1, LED2, or LED3 pins unused if
operations has been selected through ENLED[3:1] bits, due to the nature of the sensing circuitry. Leaving LED1-
3 pins unconnected, whilst the respective ENLEDx bits have been set, will force the control loop into high gain
and eventually trip the output overvoltage protection.
The LED1-3 inputs may be connected together to drive one or two LEDs at higher currents. Connecting the
current sink inputs in parallel does not affect the internal operation of the TPS6130xx. For best operation, TI
recommends disabling the LED inputs that are not used (see REGISTER5 for ENLED[3:1] bits description).
To achieve smooth LED current waveforms, the TPS61300 device actively controls the LED current ramp-up or
down sequence.
Table 7. LED Current Ramp-Up or Down Control vs Operating Mode
DIRECT DRIVE MODE (HC_SEL = 0)
HIGH-CURRENT MODE (HC_SEL = 1)
LED CURRENT RAMP-UP
ISTEP = 25 mA
ISTEP = 56.25 mA
tRISE = 12 μs
tRISE = 0.5 μs
Slew-rate
≉ 2.08 mA/μs
Slew-rate
≉ 112.5 mA/μs
LED CURRENT RAMP-DOWN
ISTEP = 25 mA
ISTEP = 56.25 mA
tFALL = 0.5 μs
tFALL = 0.5 μs
Slew-rate
≉ 50 mA/μs
Slew-rate
≉ 112.5 mA/μs
Figure 44. LED Current Slew-Rate Control
In high-current mode (HC_SEL = 1), the LED current settings are defined as a fixed ratio (×2.25) versus the
direct drive mode values (HC_SEL = L).


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