TPS92690 Datasheet, PDF (1/28 Pages) Texas Instruments – N-Channel Controller for Dimmable LED Drives with Low-Side Current Sense

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TPS92690
SLVSBK3 – DECEMBER 2012
N-Channel Controller for Dimmable LED Drives with Low-Side Current Sense
Check for Samples: TPS92690
FEATURES
1
• TPS92690Q1 is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to
125°C Operating Junction Temperature)
• V_IN Range from 4.5V to 75V
• Adjustable Current Sense (50mV – 500mV)
• Low-side Current Sensing
• 2-Ω MOSFET Gate Driver
• Input Under-Voltage Protection
• Output Over-Voltage Protection
• Cycle-by-Cycle Current Limit
• PWM Dmming Input
• Programmable Oscillator Frequency
• External Synchronization Capability
• Slope Compensation
• Programmable Soft-Start
• TSSOP-16 Exposed Pad Package
DESCRIPTION
The TPS92690/90Q1 is a high voltage, low-side
NFET controller with an adjustable output current
sense resistor voltage. Ideal for LED drivers, it
contains all of the features needed to implement
current regulators based on boost, SEPIC, flyback,
and Cuk topologies.
Output current regulation is based on peak current-
mode control supervised by a control loop. This
methodology eases the design of loop compensation
while providing inherent input voltage feed-forward
compensation. The TPS92690/90Q1 includes a high-
voltage start-up regulator that operates over a wide
input range of 4.5V to 75V. The PWM controller is
designed for high speed capability including an
oscillator frequency range up to 2.0 MHz. The
TPS92690/90Q1 includes an error amplifier, precision
reference, cycle-by-cycle current limit, and thermal
shutdown.
The TPS92690Q1 is AEC-Q100 grade 1 qualified.
APPLICATIONS
• LED Drivers
• Constant Current Regulator: Boost, Cuk,
Flyback, and SEPIC
TYPICAL APPLICATION DIAGRAM
VIN
RUV2
RUV1
RUVH
ROV2
VOUT
ROV1
RT
L1
1
nDIM
TPS92690
2
OVP
3
RT
16
VIN
15
VCC
CIN
CBYP
14
IS
4
SYNC
13
GATE
CSS
5
SS/SD
12
PGND
CCMP
6
COMP
11
CSP
D1
Q1
VOUT
I_LED
CO
CLIM
RLIM 1
RLIM 2
7
AGND
8
ILIM
DAP
10
IADJ
9
VREF
RADJ 2
RADJ 1
CREF
RCS
CADJ
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated