TPS92638-Q1_15 Datasheet, PDF (1/39 Pages) Texas Instruments – TPS92638-Q1 8-Channel Linear LED Driver With PWM Dimming

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS92638-Q1
SLVSCK5B – SEPTEMBER 2014 – REVISED MARCH 2015
TPS92638-Q1 8-Channel Linear LED Driver With PWM Dimming
1 Features
•1 Qualified for Automotive Applications
– Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
• 8-Channel LED Driver With Analog and PWM
Dimming
• Wide Input-Voltage Range: 5 V–40 V
• Adjustable Constant Output Current Set by
Reference Resistor
– Maximum Current: 70 mA per Channel
– Maximum Current: 560 mA in Parallel
Operation Mode
– Accuracy: ±3% per Channel
– Accuracy: ±4% per Device
• PWM Dimming Input (PWM)
– Turn ON/OFF Delay Time: 25 µs (typ.), 45 µs
(max.)
• 4-Bank PWM Dimming to Control 8 Channels
• Open- and Shorted-LED Detection With Deglitch
• Fault Pin for Open, Short, and Thermal-Shutdown
Failure Reporting, Allowing Parallel Bus
Connection of up to 15 Devices
• Temperature-Current Foldback to Prevent
Thermal Shutdown, With Programmable
Threshold
• Single Resistor for Stop-Current Set Point
• Single Resistor for Tail-Current Set Point
• Operating Junction Temperature Range –40°C to
150°C
• Package: 20-Pin Thermally Enhanced PWP
Package (PDSO)
2 Applications
LED Lighting Applications (for example, daytime
running light, position light, fog light, rear light,
stop or tail light, interior lighting)
3 Description
The TPS92638-Q1 is an eight-channel linear LED
driver with PWM dimming control. Its design is ideal
for driving multiple strings of LEDs up to a medium
power range.
This device can drive up to eight strings with one to
three LEDs in each string, at a total current up to
70 mA per channel. Outputs can be in parallel to
provide higher-current drive up to 560 mA.
In multiple-string applications, the device offers the
advantage of having common-cathode connection of
the LED stings. So, there is only a single return wire
needed instead of one per LED string that a system
with low-side current sense would need.
The device has the capability for switching LED
current between high current and low current for stop
and tail applications. Two reference resistors set the
two LED current levels from each output.
The included temperature monitor reduces the LED
drive current if the IC junction temperature exceeds a
thermal threshold. The temperature threshold is
programmable through an external resistor. One can
disable the thermal current-monitor feature by
connecting the TEMP pin to ground. Output of the
junction temperature as an analog voltage is available
as a factory program option.
Device Information(1)
PART NUMBER
PACKAGE BODY SIZE (NOM)
TPS92638-Q1
HTSSOP (20) 6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application Schematic
Tail
Stop
Stop
V_(bat)
EN
PWM1
PWM2
PWM3
PWM4
STOP
FAULT
SUPPLY
IOUT1
IOUT2
IOUT3
IOUT4
IOUT5
IOUT6
IOUT7
IOUT8
TPS92638-Q1
REFHI
REF
TEMP
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.