LM36010 Datasheet, PDF(14/37 Page) Texas Instruments – Synchronous-Boost, Single-LED Flash Driver With 1.5-A High-Side Current Source

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LM36010 Datasheet, PDF (14/37 Pages) Texas Instruments – Synchronous-Boost, Single-LED Flash Driver With 1.5-A High-Side Current Source

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LM36010

SNVSAN4A â APRIL 2017 â REVISED JULY 2017

www.ti.com

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. The

headroom on the current source is regulated to provide 11 mA to 1.5 A.

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]). When IR mode is enabled by the Enable Register (0x01) setting mode M1, M0 (bits [1:0]) to 01, the boost

converter turns on and sets the output equal to the input (pass mode). 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.

BOOST

VOUT

PASS

OFF

STROBE

ILED

(1) If needed, the DC/DC boost will turn on when the LED current is delivered (Strobe Pin = High). When the Strobe Pin

goes low, the output voltage will return to VIN (Pass Mode)

Figure 29. IR Mode with Boost

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