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TPS61300YFFR Datasheet(PDF) 34 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) 34 Page - Texas Instruments

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OUT
IN
IN
OUT(CL)
VALLEY
L
L
OUT
V
V
V
1
D
I
= (1
D)
(I
+
I ) with I =
and D
2
L
f
V
-
-
´
D
D
´
»
FLASH _SYNCor (SFT )
LEDCONTROL
TIMER
STIM
RESET (SFT)
FLASH
DCLIGHT
FLASH_ SYNCor (SFT )
LEDCONTROL
TIMER
STIM
RESET (SFT)
FLASH
DCLIGHT
FLASH _SYNCor (SFT )
LEDCONTROL
TIMER
STIM
RESET (SFT)
FLASH
DCLIGHT
34
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
SLVS957E – JUNE 2009 – REVISED APRIL 2016
www.ti.com
Product Folder Links: TPS61300 TPS61301 TPS61305
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
Figure 50. Edge Sensitive Timer
(Single Trigger Event)
Figure 51. Edge Sensitive Timer
(Single Trigger Event)
Figure 52. Edge Sensitive Timer
(Multiple Trigger Events)
8.4.7 Current Limit Operation
The current limit circuit employs a valley current sensing scheme. Current limit detection occurs during the off
time through sensing of the voltage drop across the synchronous rectifier. The detection threshold is user
selectable through the ILIM bit. The ILIM bit can only be set before the device enters operation (that is, initial
shutdown state).
Figure 53 illustrates the inductor and rectifier current waveforms during current limit operation. The output
current, IOUT, is the average of the rectifier ripple current waveform. When the load current is increased such that
the lower peak is above the current limit threshold, the off time is lengthened to allow the current to decrease to
this threshold before the next on-time begins (so called frequency fold-back mechanism).
Both the output voltage and the switching frequency are reduced as the power stage of the device operates in a
constant current mode. The maximum continuous output current (IOUT(CL)), before entering current limit operation,
can be defined with Equation 1.
(1)
The TPS6130xx device also provides a negative current limit (
≈300 mA) to prevent an excessive reverse inductor
current when the power stage sinks current from the output (that is, storage capacitor) in the forced continuous
conduction mode.


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