TPS92692 Datasheet, PDF (1/55 Pages) Texas Instruments – High Accuracy LED Controller With Spread Spectrum Frequency Modulation

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TPS92692, TPS92692-Q1
SLVSDD9 – MARCH 2017
TPS92692, TPS92692-Q1 High Accuracy LED Controller With
Spread Spectrum Frequency Modulation
1 Features
•1 Wide Input Voltage: 4.5 V to 65 V
• Better than ± 4% LED Current Accuracy over
–40°C to 150°C Junction Temperature Range
• Spread Spectrum Frequency Modulation for
Improved EMI
• Comprehensive Fault Protection Circuitry with
Current Monitor output and Open Drain Fault Flag
Indicator
• Internal Analog Voltage to PWM Duty Cycle
Generator for stand-alone Dimming Operation
• Compatible with Direct PWM Input with over
1000:1 Dimming Range
• Analog LED Current Adjust Input (IADJ) with over
15:1 Contrast Ratio
• Integrated P-Channel Driver to enable Series FET
Dimming and LED Protection
• TPS92692-Q1: Automotive Q100 Grade 1
Qualified
2 Applications
• TPS92692-Q1: Automotive Exterior Lighting
Applications
• Driver Monitoring Systems (DMS)
• LED General Lighting Applications
• Exit Signs and Emergency Lighting
3 Description
The TPS92692 and TPS92692-Q1 are high accuracy
peak current mode based controllers designed to
support step-up/down LED driver topologies. The
device incorporates a rail-to-rail current amplifier to
measure LED current and spread spectrum frequency
modulation technique for improved EMI performance.
This high performance LED controller can
independently modulate LED current using either
analog or PWM dimming techniques. Linear analog
dimming response with over 15:1 range is obtained
by varying the voltage across the high impedance
analog adjust (IADJ) input. PWM dimming of LED
current is achieved by directly modulating the
DIM/PWM input pin with the desired duty cycle or by
enabling the internal PWM generator circuit. The
PWM generator translates the DC voltage at
DIM/PWM pin to corresponding duty cycle by
comparing it to the internal triangle wave generator.
The optional PDRV gate driver output can be used to
drive an external P-Channel series MOSFET.
The TPS92692 and TPS92692-Q1 devices support
continuous LED status check through the current
monitor (IMON) output. The devices also include an
open drain fault indicator output to indicate LED
overcurrent, output overvoltage and output
undervoltage conditions.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS92692-Q1
TPS92692
HTSSOP (20)
5.10 mm × 6.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Typical Boost LED Driver
L
D
RCS
VIN
CIN
TPS92692-Q1
CVREF
CSS
CDM
RT
CCOMP
1
VIN
2
VREF
3
FLT
4
SS
5
DM
6
RT
7
COMP
8
IMON
RADJ2
CIMON
RDIM2
RADJ1
9
IADJ
VCTRL
DDIM
RDIM1
10
DIM/PWM
20
VCC
19
GATE
18
IS
17
GND
16
SLOPE
15
OV
14
CSP
13
CSN
12
PDRV
11
RAMP
PAD
CVCC
QM
RIS
RSLP
CRAMP
ROV2
ROV1
COUT
1
QDIM
LED +
LED í
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.