TPS92640 Datasheet, PDF (1/10 Pages) Texas Instruments – Synchronous Buck Controllers for Precision Dimming LED Drivers

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TPS92640
TPS92641
SNVS902 – NOVEMBER 2012
TPS92640 / TPS92641 Synchronous Buck Controllers for Precision Dimming LED Drivers
Check for Samples: TPS92640, TPS92641
FEATURES
1
•2 V_IN range from 7V to 85V
• 2Ω, 1A_peak MOSFET gate drivers
• Adjustable LED Current Sense voltage
• Input UVLO and output OVP
• Various dimming modes
– 500:1 Analog Dimming
– 2500:1 Standard PWM dimming
– 20000:1 Shunt FET PWM dimming
• Shunt Dimming MOSFET gate driver
• Programmable switching frequency
• Precision Voltage Reference
• Low Power Shutdown Mode and Thermal
Shutdown
DESCRIPTION
The TPS92640/41 are high voltage, synchronous
NFET controllers for buck current regulators. Output
current regulation is based on valley current-mode
control with a constant on-timer. This control method
eases the design of loop compensation. The
TPS92640/41 includes a high-voltage start-up
regulator that operates over a wide input range of 7V
to 85V. The PWM controller is designed for high
speed capability including an oscillator frequency
range up to 1.0 MHz. The TPS92640/41 is optimized
to give superior dimming performance with both
analog and PWM dimming. Both devices include an
error amplifier, precision reference, thermal shutdown
and low power shutdown mode. Additionally, the
TPS92641 provides shunt FET dimming capability.
APPLICATIONS
• LED Driver / Constant Current Regulator
• Automotive LED Drivers
• General LED Illumination
TYPICAL APPLICATION DIAGRAM
VIN
R1
R2
C1
C6
D2
UDIM
R4
R3
R8 _C7
R5
R7
R6 C8
C2
TPS92641
VIN
HG
RON
UDIM
VOUT
VREF
SW
C4
BOOT
D1
VCC
C3
LG
IADJ
CS
COMP DAP GND
Q1
L1
Q3*
Q2
R9
SDIM*
*TPS92641 only
SDIM
SDRV
LED+
C5
LED
LOAD
LED-
R10
GND
1
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2
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2012, Texas Instruments Incorporated