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TPS61300YFFR Datasheet(PDF) 23 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) 23 Page - Texas Instruments

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0.6
1.2
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4.2
DifferentialInput-OutputVoltage-V
V
=3.6V,T =25°C
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=3.6V,T =-40°C
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TPS61305
HC_SEL =1
23
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
www.ti.com
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
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Copyright © 2009–2016, Texas Instruments Incorporated
8.3.3 Start-Up Sequence
To avoid high inrush current during start-up, take special care to control the inrush current. When the device
enables, the internal start-up cycle starts with the first step, the precharge phase.
During precharge, the rectifying switch is turned on until the output capacitor is either charged to a value close to
the input voltage or
≈3.3 V, whichever occurs first. The rectifying switch is current-limited during that phase. The
current limit increases with decreasing input to output voltage difference. This circuit also limits the output current
under short-circuit conditions at the output. Figure 36 shows the typical precharge current vs input minus the
output voltage for a specific input voltage.
Figure 36. Typical DC Precharge and Short-Circuit Current
In direct drive mode (HC_SEL = L, TPS6130xx), after having precharged the output capacitor, the device starts-
up switching and increases its current limit in three steps of typically 250 mA, 500 mA, and full current limit (ILIM
setting). The current limit transitions from the first to the second step occurs after a milli-second operation. Full
current limit operation is set once the output voltage has reached its regulation limits. In this mode, the active
balancing circuit is disabled.
In high-current mode (HC_SEL = H), the precharge voltage of the storage capacitor is depending on the input
voltage and operating mode (for example, voltage regulation vs current regulation mode). In case the device is
set for exclusive current regulation operation (that is, MODE_CTRL[1:0] = 01 or 10 and ENVM = 0), the output
capacitor precharge voltage will be close to the input voltage. Under all other operating conditions, the precharge
voltage will either be close to the input voltage or to approximately 3.3 V, whichever is lower.
After having precharged the storage capacitor, the device starts-up switching. During down-mode operation, the
inductor valley current is actively limited either to 250 mA or 500 mA (refer to ILIM setting). As the device enters
boost mode operation, the current limit transitions to its full capability (refer to ILIM setting and Tx-MASK input
logic state). As a consequence, the output voltage ramps up linearly and the start-up time needed to reach the
programmed output voltage (see REGISTER6 (TPS61300, TPS61301) or REGISTER6 (TPS61305, TPS61305A)
for the OV[3:0] bits) will mainly depend on the super-capacitor value and load current. In this mode, the active
balancing circuit is enabled.


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