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EUP2588 Datasheet Preview

EUP2588 Datasheet

4 Strings High Current White LED Driver

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EUP2588
4 Strings High Current White LED
Driver with Boost Controller
DESCRIPTION
The EUP2588 is a high power and high efficiency
boost controller with 4-channel current sinker which is
ideal for large LCD backlighting applications.
EUP2588 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 EUP2588 regulates
the current in each LED string to the programmed
value set by an external current setting resistor. The
EUP2588 current matching can achieve ±1.5% and
regulation accuracy can reach ±2%.
A 3µA shutdown current and 0.85V (ILED@180mA)
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. 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.
The EUP2588 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.
EUP2588 is available in 16pin SOP and TSSOP (EP)
packages.
Typical Application Circuit
FEATURES
3µA shutdown current
4 strings in parallel and up to 18 LEDs per
string
External PWM Dimming Control
Output voltage up to 65V
Up to 180mA Drive Capability for Each String
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 TSSOP-16 and 16pin
SOP-16 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
LCD Monitor LED Backlighting
LCD-TV LED Backlighting
DS2588 Ver1.2 Dec. 2011
Figure 1. Typical Application Circuits
1




Eutech Microelectronics

EUP2588 Datasheet Preview

EUP2588 Datasheet

4 Strings High Current White LED Driver

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Pin Configurations
Package
Type
Pin Configurations
Package
Type
EUP2588
Pin Configurations
SOP-16
TSSOP-16
(EP)
Pin Description
PIN
NAME
SOP-16
CH4 1
ISET
2
OVP
3
FSET
4
EN
ICS
DRV
VCC
VIN
FAULT
5
6
7
8
9
10
COMP
11
PWMI
CH1
CH2
GND
CH3
12
13
14
15
16
TSSOP-16
(EP)
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
DESCRIPTION
Channel 4 LED current source. Leave it floating if not used.
Full-Scale LED Current Adjustment Pin. The resistance from ISET to
GND controls the full-scale current in each LED string. ISET voltage is
around 1.0V, during full lighting, ICHx=1200/RISET Ohm. Set
RISET=10KOhm, ICHx is set to 120mA.
Output over-voltage feedback input. Connect OVP to the tap point of the
resistor divider between output and ground.
Boost Switching Frequency Program pin. Program the boost frequency by
different external Resistance, and the boost converter frequency set by
formula: FSW=50000/RFSET(K). If setting FSET=100K, boost frequency
is 500KHz.
The device enable pin. A logic high signal turns on the internal LDO and
enables the IC. Connect EN to VCC and make EUP2588 always ON.
Current Sense Input. During normal operation, this pin senses the voltage
across the external inductor current sensing resistor for peak current mode
control and also to limit the inductor current during every switching cycle.
External N-CH Power Device Gate Driver Output. This pin provides the
boost converter power device gate drive signal.
5V Linear Regulator Output to power internal circuitry. Bypass VCC to
GND with a ceramic capacitor of 1µF or greater. If 4.5V<VIN < 5.5V,
connect VCC directly to supply voltage of VIN.
Supply Voltage Input.
EUP2588 Faults status output, it is an open drain output. If all the Channels
open or Over Thermal/Over Current events happen, this pin will be pulled
to low by internal open drain NMOS, otherwise, this pin will keep high by
external resistor.
Boost Converter Compensation Pin. Connect a 220nF ceramic capacitor
from COMP to GND. When the EUP2588 shuts down, COMP is
discharged to GND.
Brightness Control Input. To use external PWM dimming mode, apply a
PWM signal on this pin for brightness control. The EUP2588 has positive
dimming polarity on PWMI.
Channel 1 LED current source. Leave it floating if not used.
Channel 2 LED current source. Leave it floating if not used.
Ground.
Channel 4 LED current source. Leave it floating if not used.
DS2588 Ver1.2 Dec. 2011
2


Part Number EUP2588
Description 4 Strings High Current White LED Driver
Maker Eutech Microelectronics
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EUP2588 Datasheet PDF






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