IS32LT3181 Datasheet, PDF (1/19 Pages) Integrated Silicon Solution, Inc – RCL DUAL INTENSITY, SIX CHANNEL LED DRIVER WITH FAULT DETECTION

IS32LT3181
RCL DUAL INTENSITY, SIX CHANNEL LED DRIVER WITH FAULT DETECTION
GENERAL DESCRIPTION
The IS32LT3181 is a six channel linear current
regulator for automotive rear tail light applications such
as RCL (Rear Combination Lamps) and CHMSL
(Center High Mounted Stop Lamps). It is fully
programmable with two LED brightness levels for the
different intensity requirements of “stop” bright (DC
mode) and “tail” dim (PWM mode).
A logic level at the PWM pin is used to select between
the tail and stop output conditions. The stop condition
provides the highest intensity output, while the tail
condition utilizes an internally generated PWM signal
to reduce the intensity of the LEDs’ light output.
An active low fault output signal reports a device error
condition. The FAULTB pin of several devices can be
tied together to disable all the output stages when a
fault is detected by any one of the devices.
The sink current at the OUTx pins is easily set with a
single resistor at the STOP pin. The constant-current
sink outputs can be combined in parallel to create
higher current-driving capability on a single string. A
second resistor at the TAIL pin sets the duty cycle of
the internal PWM oscillator for dimming the LED output
when operating in the tail condition.
An external FET (optional) can be implemented for
operation with wide varying supply voltages to
minimize device thermal dissipation.
The IS32LT3181 is offered in an eTSSOP-16 package.
TYPICAL APPLICATION CIRCUIT
FEATURES
Preliminary Information
September 2016
 Operating voltage from 6V to 42VDC
- Withstand 50V load dump
 6 constant-current channel sinks
- Adjustable from 10mA to 75mA per channel
- Channel paralleling for higher current
- Low dropout voltage of 0.8V@35mA
- Slew rate control on each output for better EMI
performance
 Integrated PWM dimming engine provides two
LED brightness levels without external logic
- Tail duty cycle programmable from 1% to 95%
- PWM logic level input selects between full
brightness and PWM dimming levels
 Support for optional FET to minimize device power
consumption
 Open Drain FAULTB reporting pin
- Programmable FAULTB delay time
- Programmable UVLO threshold
- LED open circuit detection
- STOP pin over current protection
- Over temperature protection
 Device disable upon fault detection
- Parallel connection to other devices
 AEC-Q100 qualification (pending)
APPLICATIONS
 Rear Combinational Lamp (RCL)
 Center High Mount Stop Light (CHMSL)
 Daytime running lamp
 Fog lamps
 Turn signal
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. 0B, 09/02/2016