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Eutech Microelectronics

EUP2589 Datasheet Preview

EUP2589 Datasheet

12 String White LED Driver With Boost Controller

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EUP2589
12 String White LED Driver
With Boost Controller
DESCRIPTION
The EUP2589 is a high power and high efficiency
boost controller with 12-channel current sinker which
is ideal for large LCD backlighting applications.
EUP2589 uses current mode, fixed frequency
architecture which can clamp the inductor peak current
each cycle. The switching frequency is programmable
by an external frequency setting resistor. It drives an
external MOSFET to boost up the output voltage from
a 4.5V to 28V input supply. The EUP2589 regulates
the current in each LED string to the programmed
value set by an external current setting resistor. The
EUP2589 current matching can achieve ±1.5% and
regulation accuracy can reach ±2%.
A 3µA shutdown current and 1.0V (ILED@60mA)
feedback voltage and Maximum 65V output allows for
up to 18 high-power LEDs in series will greatly
improve efficiency and reduce power dissipation.
The device supports pulse width modulation (PWM)
brightness dimming and DC voltage dimming. During
digital PWM dimming, the WLED current is turned
on/off at the duty cycle and frequency determined by
the PWM signal on the PWMI pin. In DC voltage
dimming, LEDs current turn ON/OFF frequency
programmed by the capacitor from BOSC to GND.
The EUP2589 integrated multiple protect functions,
such as LED Open, LED Short, Output Over voltage,
Over thermal, Input Over current, and Under voltage
lockout (UVLO), these protection will prevent the
LCD backlight from damage.
Typical Application Circuit
FEATURES
3µA shutdown current
12 strings in parallel and up to 18 LEDs per
string
External PWM or DC Voltage Dimming
Control
Output voltage up to 65V
Wide Input voltage range 4.5V to 28V
Better than 1.5% LED Current Regulation
Accuracy Between Strings
Boost Switching frequency can be programmed
by external resistor
Multiple Fault Protections
-Current Limit protection
-Output Short circuit detection
-Over-temperature protection
-Output Over-voltage protection
LED current turn off in shutdown mode
Integrated UVLO/ Over Thermal protection
Minimal 0.5µs LED On-Time regulation
Thermal Enhanced 28pin TSSOP28 and
SOP-28 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
LCD Monitor LED Backlighting
LCD-TV LED Backlighting
DS2589 Ver1.1 May 2011
Figure 1. Typical Application circuits
1




Eutech Microelectronics

EUP2589 Datasheet Preview

EUP2589 Datasheet

12 String White LED Driver With Boost Controller

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Pin Configurations
Package
Type
Pin Configurations
Package
Type
EUP2589
Pin Configurations
TSSOP-28
SOP-28
Pin Description
PIN TSSOP-28 SOP-28
DESCRIPTION
1 NC NC Not connect.
2 VIN VIN Supply Voltage Input.
5V Linear Regulator Output to power internal circuitry. Bypass VCC to GND
3
VCC
VCC with a ceramic capacitor of 1µF or greater. If 4.5V<VIN < 5.5V, connect VCC
directly to supply voltage of VIN.
Boost Converter Compensation Pin. Connect a 220nF ceramic capacitor in series
4
COMP
COMP with a 1k resistor from COMP to GND. When the EUP2589 shuts down, COMP
is discharged to GND.
5 EN
EN
The device enable pin. A logic high signal turns on the internal LDO and enables
the IC. Connect EN to VCC and make EUP2589 always ON.
Brightness Control Input. To use external PWM dimming mode, apply a PWM
6
PWMI
PWMI
signal on this pin for brightness control. To use DC input PWM dimming mode,
apply a DC voltage range from 0.2V to 1.2V on this pin linearly to set the
internal dimming duty cycle from 0% to 100%.
7
GND
GND Ground
8
FSET
FSET
Boost Switching Frequency Program pin. Program the boost frequency by
different external resistance, FBOOST=57000/RFSET.
Full-Scale LED Current Adjustment Pin. The resistance from ISET to GND
9
ISET
ISET
controls the full-scale current in each LED string. ISET voltage is around 1.0V,
during full lighting, ICHx=1200/RISET . Set RISET=20K, ICHx is set to
60mA.
Dimming Repetition Set. This is the timing pin for the oscillator to set the
dimming frequency. To use DC input PWMI dimming mode, connect a
10
BOSC
BOSC
capacitor from this pin to GND to set the internal dimming frequency. A triangle
waveform is generated on this pin. To use external PWM dimming mode,
connect a resistor from BOSC to GND set its voltage to about 0.7V, and apply
the PWM signal on DBRT pin.
11~22 CH1~CH12 CH1~CH12 Channel 12~1 LED current source. Leave it floating if not used.
23
OVP
OVP
Output over-voltage feedback input. Connect OVP to the tap point of the resistor
divider between output and ground.
Current Sense Input. During normal operation, this pin senses the voltage across
24 ICS
ICS the external inductor current sensing resistor for peak current mode control and
also to limit the inductor current during every switching cycle.
25
PGND
PGND Power Ground
26
DRV
DRV
External N-CH Power Device Gate Driver Output. This pin provides the boost
converter power device gate drive signal.
DS2589 Ver1.1 May 2011
2


Part Number EUP2589
Description 12 String White LED Driver With Boost Controller
Maker Eutech Microelectronics
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EUP2589 Datasheet PDF






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