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IS32LT3174 Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc

Part # IS32LT3174
Description  SINGLE CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT
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Manufacturer  ISSI [Integrated Silicon Solution, Inc]
Direct Link  http://www.issi.com
Logo ISSI - Integrated Silicon Solution, Inc

IS32LT3174 Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc

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IS32LT3174
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 06/14/2016
10
APPLICATION INFORMATION
The IS32LT3174 is a single channel linear current
driver optimized to drive an automotive interior map
light, or other interior lamp which is frequently toggled
between the on and off condition. The device
integrates an input control for the channel allowing for
on/off operation. In addition, a programmable fade in
and fade out feature is integrated into channel’s control
block to allow the end customer maximum flexibility in
setting up their light timing requirements.
The regulated LED current (up to 200mA) is set by a
single reference resistor (RISET).
OUTPUT CURRENT SETTING
A single programming resistor (RISET) controls the
maximum output current for output channel
simultaneously. The programming resistor may be
computed using the following Equation (1):
SET
ISET
I
R
2000
(1)
(10kΩ≤RISET≤100kΩ)
The device is protected from an output overcurrent
condition caused by an accidental short circuit of the
ISET pin, by internally limiting the maximum current in
the event of an ISET short circuit to 260mA.
EN PIN OPERATION
The EN inputs to the device include internal pull-up
sources so that no external components are required
to provide the input high level to the pin.
The output channel powers up in the ‘OFF’ condition.
Toggling the EN pin from high to low on a given
channel for a period of time that exceeds the debounce
time will cause that channel’s output to toggle from the
OFF condition to the source condition. When this
happens, the output current of the channel gradually
ramps up from zero to the programmed value (set by
RISET) over the time set by the resistor (RTSET) attached
to the ISET pin. Conversely, if a channel is already in
the source condition, and that channel’s EN pin is
toggled low, then the output current shall begin to ramp
down towards zero in the time period as programmed
by the resistor (RTSET) attached to the TSET pin.
Note, the EN input is available during the period of
either fade in or fade out condition.
Figure 18
EN Debounced
Debounce -
Output control is provided by a
debounced switch input, providing an ON/OFF toggle
action for various switch or button characteristics. An
internal debounce circuit will condition the input signal
so a single press of the mechanical switch doesn't
appear like multiple presses. The EN input is
debounced by typically 37ms.
Note: The debounce time applies to both falling and
rising edges of the EN signal.
FADE IN AND FADE OUT
When an EN channel is turned on (pulled low), the
output current of the channel shall gradually ramp up
from zero to the final value as programmed by the
resistor (RISET) connected to the ISET pin. The time
period over which the ramping happens is determined
by the resistor (RTSET) connected to the TSET pin. The
output current shall ramp up (or down) in 63 steps, with
integrated gamma correction for an extremely linear
ramping of the luminous output of the LED bulb.
SETTING THE FADE TIME
The fade time, either in or out, for channel is set by a
single external programming resistor (RTSET). The fade
time is programmable by Equation (2):
s
R
t
TSET
5
.
2
(2)
For example, RTSET=100kΩ, fade time is about 0.25s.
Note: In order to get the optimized effect, the
recommended fading time is between 1.5s
(RTSET=600kΩ) and 0.25s (RTSET=100kΩ).
If the TSET pin is tied directly to GND, the fade in/out
function is canceled and the ramp time is about 73µs,
or ‘instant on’. However, the debounce feature of the
EN pin is not disabled.


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