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LM2795TL Folha de dados(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM2795TL
Descrição Electrónicos  Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
Download  16 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2795TL Folha de dados(HTML) 9 Page - National Semiconductor (TI)

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Functional Block Diagram
20028530
Application Information
CIRCUIT DESCRIPTION
The LM2794/5 is a 1.5x/1x CMOS charge pump with four
matched constant current outputs, each capable of driving
up to 20mA through White LEDs. This device operates over
the extended Li-Ion battery range from 2.7V to 5.5V. The
LM2794/5 has four regulated current sources connected to
the device’s 1.5x charge pump output (P
OUT). At input volt-
ages below 4.7V (typ.), the charge-pump provides the
needed voltage to drive high forward voltage drop White
LEDs. It does this by stepping up the P
OUT voltage 1.5 times
the input voltage. The charge pump operates in Pass Mode,
providing a voltage on P
OUT equal to the input voltage, when
the input voltage is at or above 4.7V (typ.). The device can
drive up to 80mA through any combination of LEDs con-
nected to the constant current outputs D
1-D4.
To set the LED drive current, the device uses a resistor
connected to the I
SET pin to set a reference current. This
reference current is then multiplied and mirrored to each
constant current output. The LED brightness can then be
controlled by analog and/or digital methods. Applying an
analog voltage in the range of 0V to 3.0V to the Brightness
pin (BRGT) adjusts the dimming profile of the LEDs. The
digital technique uses a PWM (Pulse Width Modulation)
signal applied to the Shutdown pin (SD). (see I
SET and
BRGT PINS section).
SOFT START
Soft start is implemented internally by ramping the reference
voltage more slowly than the applied voltage. During soft
start, the current through the LED outputs will ramp up in
proportion to the rate that the reference voltage is being
ramped up.
www.national.com
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