TPS92691 Datasheet, PDF (1/46 Pages) Texas Instruments – Multi-Topology LED Driver With Rail-to-Rail Current Sense Amplifier

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TPS92691, TPS92691-Q1
SLVSD68 – DECEMBER 2015
TPS92691/-Q1 Multi-Topology LED Driver With Rail-to-Rail Current Sense Amplifier
1 Features
•1 Wide Input Voltage: 4.5 V to 65 V
• Wide Output Voltage Range: 2 V to 65 V
• Low Input Offset Rail-to-Rail Current Sense
Amplifier
– Better than ±3% LED Current Accuracy over
25°C to 140°C Junction Temperature Range
– Compatible With High-Side and Low-Side
Current Sense Implementations
• High-Impedance Analog LED Current Adjust Input
(IADJ) With over 15:1 Contrast Ratio
• Over 1000:1 Series FET PWM Dimming Ratio
With Integrated Series N-Channel Dim Driver
Interface
• Continuous LED Current Monitor Output for
System Fault Detection and Diagnoses
• Programmable Switching Frequency With External
Clock Synchronization Capability
• Programmable Soft-Start and Slope
Compensation
• Comprehensive Fault Protection Circuitry
Including VCC Undervoltage Lockout (UVLO),
Output Overvoltage Protection (OVP), Cycle-by-
Cycle Switch Current Limit, and Thermal
Protection
• TPS92691-Q1: Automotive Q100 Grade 1
Qualified
3 Description
The TPS92691/-Q1 is a versatile LED controller that
can support a range of step-up or step-down driver
topologies. The device implements a fixed-frequency
peak current mode control technique with
programmable switching frequency, slope
compensation, and soft-start timing. It incorporates a
high voltage (65-V) rail-to-rail current sense amplifier
that can directly measure LED current using either a
high-side or a low-side series sense resistor. The
amplifier is designed to achieve low input offset
voltage and attain better than ±3% LED current
accuracy over junction temperature range of 25°C to
140°C and output common-mode voltage range of 0
to 60 V.
LED current can be independently modulated using
either analog or PWM dimming techniques. Linear
analog dimming response with 15:1 range is obtained
by varying the voltage from 140 mV to 2.25 V across
the high impedance analog adjust (IADJ) input. PWM
dimming of LED current is achieved by modulating
the PWM input pin with the desired duty cycle and
frequency. Optional DDRV gate driver output can be
used to enable series FET dimming functionality to
get over 1000:1 contrast ratio.
The TPS92691/-Q1 supports continuous LED status
check through the current monitor (IMON) output.
This allows for LED short circuit or open circuit
detection and protection. Additional fault protection
features include VCC UVLO, output OVP, switch
cycle-by-cycle current limit, and thermal protection.
2 Applications
• TPS92691-Q1: Automotive Exterior Lighting
Applications
• Architectural and General Lighting Applications
Typical Boost LED Driver Application Schematic
VIN
RADJ2
RADJ1
L
CIN
CVCC
TPS92691-Q1
CSS
1 _VIN
VCC ¹⁶
2 _SS
GATE ¹⁵
RT
3 _RT/SYNC
IS ¹⁴
VPWM
4 _PWM
PGND ¹³
RIS
5 _COMP
CCOMP _{6 IADJ}
OVP ¹²
DDRV ¹¹
CIMON
7 _IMON
8 _AGND
CSP ¹⁰
CSN ⁹
PAD
D
Q1
COV
ROV2
ROV1
RCS _LED+
COUT
Q2
LEDÅ
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS92691-Q1
TPS92691
HTSSOP (16)
5.10 mm × 6.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Output Voltage
100
V_O = 60 V, I_LED = 300 mA
95
90
85
80
75
8 9 10 11 12 13 14 15 16 17 18
V_IN (V)
D019
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.