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LM36011 Datasheet(PDF) 10 Page - Texas Instruments

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Part No. LM36011
Description  Inductorless, Single-LED Flash Driver With 1.5-A High-Side Current Source
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM36011 Datasheet(HTML) 10 Page - Texas Instruments

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STROBE
ILED
TIME-OUT
Start
TIME-OUT
Reached
VOUT goes low,
LED turn off
STROBE
ILED
10
LM36011
SNVSAN5 – JULY 2017
www.ti.com
Product Folder Links: LM36011
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Copyright © 2017, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Flash Mode
In flash mode, the LED current source provides 128 target current levels from 11 mA to 1.5 A, set by the LED
Flash Brightness Register (0x03 bits [6:0]). Flash mode is activated by the Enable Register (0x01), setting mode
M1, M0 (bits [1:0]) to 11. Once the flash sequence is activated, the LED current source ramps up to the
programmed flash current by stepping through all current steps until the programmed current is reached.
When flash mode is enabled using the mode M1, M0 (bits [1:0]) of the Enable Register (0x01), the mode bits in
the Enable Register are cleared after a flash time-out event.
7.3.2 Torch Mode
In torch mode, the LED current source provides 128 target current levels from 2.4 mA to 376 mA, set by the LED
Torch Brightness Register (0x04 bits [6:0]). Torch mode is activated by the Enable Register (0x01), setting mode
M1, M0 (bits [1:0]) to 10. Once the TORCH sequence is activated, the LED current source ramps up to the
programmed torch current by stepping through all current steps until the programmed current is reached. The
rate at which the current ramps is determined by the value chosen in the Torch Ramp bit [0] in Timing Register
(0x02).
7.3.3 IR Mode
In IR mode, the target LED current is equal to the value stored in the LED Flash Brightness Register (0x03 bits
[7:0]). IR mode is enabled by the Enable Register (0x01) setting mode M1, M0 (bits [1:0]) to 01. In IR mode,
toggling the STROBE pin enables and disables the LED current source. The STROBE pin can only be set to be
Level sensitive, as all timing of the IR pulse is externally controlled. In IR mode, the current source does not
control the ramp rate of the LED output. The current transitions immediately from off to on and then on to off.
Figure 17. IR Mode
(1)
When the flash timer elapses, the device goes into stand-by regardless of strobe state
Figure 18. IR Mode Time-out


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