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TPS61311 Datasheet(PDF) 28 Page - Texas Instruments

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Part # TPS61311
Description  1.5A Multiple LED Camera Flash and Video Light Driver With I2CTM Compatible Interface
PDF  57 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS61311 Datasheet(HTML) 28 Page - Texas Instruments

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VOUT NOM.
PFMmodeatlightload
PWMmodeatheavyload
PFMrippleabout 0.015 xVOUT
1.013 xVOUT NOM.
Output
Voltage
FLASH
DCLIGHT
LEDCURRENT
STRB0
Tx- MASK
TPS61310, TPS61311
SLVS978C – MARCH 2010 – REVISED NOVEMBER 2012
www.ti.com
Table 6. Inductor Current Limit Operation
CURRENT LIMIT SETTING
ILIM BIT
TPS61310
TPS61311
1250 mA
1800 mA
Low
1750 mA
2480 mA
High
Flash Blanking (Tx-Mask) for Instantaneous Flash-Current Reduction
The TPS6131x devices offer a dedicated hardware signal input (Tx-Mask) that can be used to reduce the flash
current to the programmed video light level instantaneously.
This feature can be used to reduce the overall current drawn from the battery if other system components require
high energy simultaneously, e.g. during a RF PA transmission pulse.
The Tx-MASK function has no influence on the safety timer duration.
Figure 48. Synchronized Flash With Blanking Periods (STRB1 = 0)
POWER-SAVE MODE OPERATION, EFFICIENCY
The TPS6131x integrates a power-save mode to improve efficiency under light loads. In power-save mode the
converter only operates when the output voltage trips below a set threshold voltage. It ramps up the output
voltage with one-to-several pulses and returns to power-save mode once the output voltage exceeds the set
threshold voltage.
Figure 49. Operation in PFM Mode and Transfer to PWM Mode
The power-save mode can be enabled and disabled via the ENPSM bit. In down conversion mode, power-save
mode is always active and the device cannot be forced into fixed frequency operation at light loads.
The LED sense voltage has a direct effect on converter efficiency. Because the voltage across the low-side
current regulator does not contribute to the output power (LED brightness), the lower the sense voltage the
higher the efficiency will be.
28
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Copyright © 2010–2012, Texas Instruments Incorporated
Product Folder Links: TPS61310 TPS61311



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