TPS61196-Q1_15 Datasheet, PDF (1/31 Pages) Texas Instruments – TPS61196-Q1 6-String 400-mA WLED Driver with Independent PWM Dimming For Each String

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TPS61196-Q1 6-String 400-mA WLED Driver with
Independent PWM Dimming For Each String
TPS61196-Q1
SNVSA79 – MARCH 2015
1 Features
•1 8-V to 30-V Input Voltage
• Up to 120-V Output Voltage
• 100-KHz to 800-kHz Programmable Switching
Frequency
• Adaptive Boost Output for LED Voltages
• Six Current Sinks, 200-mA Continuous Output,
400-mA Pulse Output for Each String
• ±1.5% Current Matching Between Strings
• High Precision PWM Dimming Resolution up to
5000:1
• Programmable OVP Threshold
• Programmable Input UVLO Threshold
• Adjustable Soft-Start Time
• Built-in LED Open and Short Protection
• Built-in Schottky Diode Open and Short Protection
• Built-in ISET Short Protection
• Built-in IFB Short Protection
• Thermal Shutdown
2 Applications
• Automotive LCD Backlighting
• Automotive Cluster Displays
• Automotive Secondary Displays
3 Description
The TPS61196-Q1 provides a highly integrated
solution for automotive LCD backlighting with an
independent PWM dimming function for each string.
This device is a current mode boost controller driving
up to six WLED strings with multiple LEDs in series.
Each string has an independent current regulator
providing a LED current adjustable from 50 mA to
400 mA within ±1.5% matching accuracy. The
minimal voltage at the current sink is programmable
in the range of 0.3 V to 1 V to fit with different LED
current settings. The input voltage range for the
device is from 8 V to 30 V.
The TPS61196-Q1 adjusts the boost controller's
output voltage automatically to provide only the
voltage required by the LED string with the largest
forward voltage drop plus the minimum required
voltage at that string's IFB pin, thereby optimizing
driver efficiency. Its switching frequency is
programmed by an external resistor from 100 kHz to
800 kHz.
The TPS61196-Q1 supports direct PWM brightness
dimming. Each string has an independent PWM
control input. During the PWM dimming, the LED
current is turned on or turned off at the frequency and
duty cycle which are determined by the external
PWM signal. The PWM frequency ranges from 90 Hz
to 22 kHz.
The TPS61196-Q1 integrates overcurrent protection,
output short-circuit protection, ISET short-to-ground
protection, diode open and short protection, LED
open and short protection, and overtemperature
shutdown circuit. In addition, the TPS61196-Q1 can
detect the IFB pin short to ground to protect the LED
string. The device also provides programmable input
undervoltage lockout threshold and output
overvoltage protection threshold.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS61196-Q1
HTSSOP (28)
9.70 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
VIN = 24V
L1
68mH
D1
EC1
100mF
C1
10mF
C4
10nF
R5
200k
C2
2.2mF
R1
182k
VIN
UVLO
R2
24.9k
VDD
C3
1.0mF
TPS61196
GDRV
ISNS
PGND
OVP
COMP
FSW
REF
EN
FAULT
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
IFB1
IFB2
IFB3
IFB4
IFB5
IFB6
IFBV
FBP
ISET
Thermal pad AGND
R19
3
R6
200
C5
470pF
EC2
100mF
Q1
R7
0.1
R3
255k
R4
10k
C7
2.2mF
R9
200k
R8
150k
C6
47nF
C8
160pF
R11
37.4k
R12
196k
R10
60.4k
C9
0.1mF
R13 R14 R15 R16 R17 R18
10M 10M 10M 10M 10M 10M
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.