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LM2758

SNVS551E – APRIL 2008 – REVISED MAY 2016

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7.4 Device Functional Modes

7.4.1 Modes

There are four modes of operation for LM2758: the flash mode, torch mode, indicator mode and shutdown mode

(see Table 1). Torch and flash modes sink a constant DC current while indicator mode operates in pulsating DC

at 1/32 positive duty cycle with same current magnitude as torch mode.

7.4.2 Logic Control Pins

The LM2758 has two logic pins, EN1 and EN2. There is a 500-k

Ω (typical) pulldown resistor connected from EN1

to GND and from EN2 to GND. The operating modes of the part function according to Table 1:

Table 1. EN1 and EN2 Truth Table

EN1

EN2

MODE

0

0

Shutdown

1

0

Indicator

0

1

Torch

1

1

Flash