Rainbow-electronics MAX16834 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Painel de controlo Rainbow-electronics MAX16834. Rainbow Electronics MAX16834 User Manual Manual do Utilizador

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General Description
The MAX16834 is a current-mode high-brightness LED
(HB LED) driver for boost, buck-boost, SEPIC, and high-
side buck topologies. In addition to driving an n-channel
power MOSFET switch controlled by the switching con-
troller, it also drives an n-channel PWM dimming switch to
achieve LED PWM dimming. The MAX16834 integrates
all the building blocks necessary to implement a fixed-fre-
quency HB LED driver with wide-range dimming control.
The MAX16834 features constant-frequency peak cur-
rent-mode control with programmable slope compensa-
tion to control the duty cycle of the PWM controller.
A dimming driver designed to drive an external n-chan-
nel MOSFET in series with the LED string provides
wide-range dimming control up to 20kHz. In addition to
PWM dimming, the MAX16834 provides analog dim-
ming using a DC input at REFI. The programmable
switching frequency (100kHz to 1MHz) allows design
optimization for efficiency and board space reduction.
A single resistor from RT/SYNC to ground sets the
switching frequency from 100kHz to 1MHz while an
external clock signal at RT/SYNC disables the internal
oscillator and allows the MAX16834 to synchronize to
an external clock. The MAX16834’s integrated high-
side current-sense amplifier eliminates the need for a
separate high-side LED current-sense amplifier in
buck-boost applications.
The MAX16834 operates over a wide supply range of
4.75V to 28V and includes a 3A sink/source gate driver
for driving a power MOSFET in high-power LED driver
applications. The MAX16834 is also suitable for DC-DC
converter applications such as boost or buck-boost.
Additional features include external enable/disable
input, an on-chip oscillator, fault indicator output (FLT)
for LED open/short or overtemperature conditions, and
an overvoltage protection sense input (OVP+) for true
overvoltage protection.
The MAX16834 is available in a thermally enhanced
4mm x 4mm, 20-pin TQFN-EP package and is specified
over the automotive -40°C to +125°C temperature range.
Applications
Single-String LED LCD Backlighting
Automotive Rear and Front Lighting
Projection System RGB LED Light Sources
Architectural and Decorative Lighting (MR16, M111)
Spot and Ambient Lights
DC-DC Boost/Buck-Boost Converters
Features
o Wide Input Operating Voltage Range (4.75V to
28V)
o 3000:1 PWM Dimming
o Analog Dimming
o Integrated PWM Dimming MOSFET Driver
o Integrated High-Side Current-Sense Amplifier for
LED Current Sense in Buck-Boost Converter
o 100kHz to 1MHz Programmable High-Frequency
Operation
o External Clock Synchronization Input
o Programmable UVLO
o Internal 7V Low-Dropout Regulator
o Fault Output (FLT) for Overvoltage, Overcurrent,
and Thermal Warning Faults
o Programmable True Differential Overvoltage
Protection
o 20-Pin TQFN-EP Package
MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
________________________________________________________________
Maxim Integrated Products
1
V
IN
BOOST LED DRIVER
IN
ON
NDRV
CS
ANALOG
DIM
OFF
DIMOUT
SENSE+
PWMDIM
PGND
LED+
LEDs
LED-
MAX16834
REFI
Simplified Application Circuit
Ordering Information
19-4235; Rev 0; 8/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
PART TEMP RANGE
PIN-PACKAGE
MAX16834ATP+
-40°C to +125°C 20 TQFN-EP*
Pin Configuration appears at end of data sheet.
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Resumo do Conteúdo

Página 1 - MAX16834

General DescriptionThe MAX16834 is a current-mode high-brightness LED(HB LED) driver for boost, buck-boost, SEPIC, and high-side buck topologies. In a

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver10 _____________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver12 _____________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834configuration, the input current is the inductor currentminus the LED current. But for both configurations, theripple current that the input f

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lowing equation. The MOSFET must be mounted on aboard as per manufacturer specifications to dissipatethe heat.The RMS current rating of the switching

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MAX16834Boost configuration:Buck-boost configuration:where RLEDis the dynamic impedance (rate of changeof voltage with current) of the LED string at t

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver18 _____________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver2 ______________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver20 _____________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET DriverMaxim cannot assume responsibility for use of an

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver4 ______________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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Pin DescriptionPIN NAME FUNCTION1 OVP+LED-String Overvoltage Protection Input. Connect a resistive voltage-divider between the positiveoutput, OVP+, a

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver________________________________________________

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MAX16834High-Power LED Driver with Integrated High-Side LEDCurrent Sense and PWM Dimming MOSFET Driver8 ______________________________________________

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MAX16834Undervoltage Lockout/EnableThe MAX16834 features an adjustable UVLO using theenable input (UVEN). Connect UVEN to VINthrough aresistive divide

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