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PDF EUP2592 Data sheet ( Hoja de datos )
| Número de pieza | EUP2592 | |
| Descripción | 8-String White LED Driver | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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EUP2592
8-String White LED Driver for LCD
Panel Application
DESCRIPTION
The EUP2592 is an 8-channel WLED driver that
controls WLED current for LCD backlight application.
The EUP2592 is capable of driving up to eight strings
in parallel and 12 LEDs per string. Each string is
terminated with ballast that achieves ±1.5% current
regulation accuracy between strings, ensuring even
LED brightness. The EUP2592 have wide input
voltage range from 4.5V to 28V, and provide
adjustable 5mA to 50mA LED current. EUP2592 uses
an external PWM signal to control WLED dimming.
EUP2592 has built in many fault protections.
The EUP2592 step-up controller features an internal
150mΩ (typ.), 48V (max.) power MOSFET with local
current-sense amplifier for accurate cycle-by-cycle
current limit. This architecture greatly simplifies the
external circuitry and saves PCB space. The EUP2592
minimizes the headroom voltage of output and power
loss by detecting the highest LED forward voltage
dynamically. Low-feedback voltage at each LED string
360mV (typ.) at 20mA LED current helps reduce
power loss and improve efficiency.
The EUP2592 internally generates a PWM signal for
accurate WLED dimming control. The PWM
frequency is resistor programmable, while PWM duty
cycle is controlled directly from an external PWM
signal or through an adjustable resistor at PWMO pin.
This internal PWM dimming control provides a
dimming range with 8-bit resolution to maximize
battery life. The EUP2592 WLED brightness can also
be directly modulated with an external PWM signal
from 100Hz to 10kHz.
The EUP2592 have extensive protection that include
string open and short detection, over voltage protection,
over-temperature protection and an optional input
over-current protection with an external fault
disconnect switch.
FEATURES
Up to 8 strings in parallel and 12 LEDs per
string Maximum number of LEDs that can be
driven is 96 (8x12) WLEDs
Accurate PWM Dimming Control with 8-bit
Resolutions
External Direct PWM Dimming Control Mode
Wide Input Voltage Range 4.5V to 28V
Internal 0.15Ω 48V Power MOSFET
±1.5% LED Current Regulation Accuracy
Between Strings
Dynamic Headroom Control for LED Outputs
Low String Feedback Voltage: 360mV at 20mA
LED Current
User Selectable Switching Frequency 500kHz
and 1200kHz
Multiple Fault Protections
-LED Open Circuit Detection
-LED Short Circuit Detection
-Over-Temperature Protection
-Output Over-Voltage Protection
-Input over current protection
Small 24-Pin, 4mm x 4mm, Thin TQFN
Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Notebook Displays LED Backlighting
LCD Monitor LED Backlighting
DS2592 Ver1.1_SZ Jan. 2010
1
1 page  
EUP2592Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Pin Description (continued)
PIN TQFN-24
DESCRIPTION
12 CH4 String 4 LED current source. Leave it floating if not used.
13 CH3 String 3 LED current source. Leave it floating if not used.
14 CH2 String 2 LED current source. Leave it floating if not used.
15 CH1 String 1 LED current source. Leave it floating if not used.
16
17, 18
OVP
PGND1,
PGND2
Output over-voltage feedback input. Connect OVP to the tap point of the resistor divider
between output and ground.
Step-up converter Power Ground.
19, 20 LX1,LX2 Step-up converter Power MOSFET Drain.
21 FAULT Gate control output of the fault disconnect switch.
Step-Up Converter Compensation Pin. Connect a 22nF ceramic capacitor in series with a
22 COMP 5.1k resistor from COMP to GND. When the EUP2592 shuts down, COMP is discharged
to GND.
23 VIN Input supply for the device and LED power.
5V Linear Regulator Output to power internal circuitry. If 4.5V<VIN < 5.5V, connect
24 VCC VCC directly to supply voltage of VIN. Bypass VCC to GND with a ceramic capacitor
of 0.47µF or greater.
-
Thermal Exposed Backside Pad. Solder to the circuit board ground plane with sufficient copper
pad connection to ensure low thermal resistance.
Ordering Information
Order Number
EUP2592JIR1
Package Type
TQFN-24
Marking
xxxxx
P2592
EUP2592 □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
J: TQFN
Operating Temperature Range
-40 °C to +85°C
DS2592 Ver1.1_SZ Jan. 2010
5
5 Page 
EUP2592Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Figure 5. ICHx=40mA Application Circuit
The un-used LED current sources can be floated. When
the IC is powered up, the device scans settings for all
CH_ pins. All CH_ pins in use are combined to extract a
lowest CH_voltage which is fed into the step-up
converter’s error amplifier and is used to set the output
voltage.
LED Brightness PWM Dimming Control
The EUP2592 allows users to accurately control PWM
dimming in two ways with an external PWM input signal.
(1)External Direct PWM Mode: Connect FPWM pin to
VCC pin and enter the external direct PWM mode. The
ISET pin sets the amplitude of the current sources for
each LED string. The external PWM signal directly
controls the PWM dimming frequency and duty cycle
of 8 channel LED current sources. The resulting current
is chopped and synchronized to the PWM input signal.
When filtered by the slow response time of the human
eye, the overall brightness is modulated in a consistent
flicker-free manner.
(2)Internal PWM Mode: Connect a resistor from FPWM
to GND and internally set PWM dimming frequency.
f
PWM
=
200Hz ×113kΩ
R FPWM
Figure 6. The Internal PWM Duty Cycle vs
The External PWM Signal Duty Cycle
If the external PWM signal is not available, users can use
an adjustable resistor to set the internal PWM dimming
signal duty cycle. Connect PWMI input to GND and
connect an external adjustable resistor between PWMO
and VCC. The external adjustable resistor and the internal
40kΩ resistor form a resistor divider and set PWMO
voltage level (Figure 7).
The internal PWM signal controls the duty cycle of 8
channel current sources. The duty cycle of this PWM
signal is proportional to the PWMO voltage. PWMO is a
filtered PWMI signal output. Connect two 1µF capacitors
from PWMO to VCC and GND. The capacitors form a
lowpass filter with an internal 40kΩ (typ) resistor to
convert the external PWM signal into an analog PWMO
signal whose level represents the duty-cycle information
of the external PWM signal. The internal PWM dimming
signal duty cycle relationship with the external PWM
duty cycle is shown in Figure 6. The maximum internal
PWM dimming signal duty cycle is 99.6%.
Figure 7. Internal PWM Dimming Duty Cycle Control
with An External Adjustable Resistor Circuit Diagram
DS2592 Ver1.1_SZ Jan. 2010
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EUP2592.PDF ] | |
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