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PDF LED7707 Data sheet ( Hoja de datos )
| Número de pieza | LED7707 | |
| Descripción | 6-rows 85 mA LEDs driver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LED7707 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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LED7707
6-rows 85 mA LEDs driver with boost regulator
for LCD panels backlight
Features
■ Boost section
– 4.5 V to 36 V input voltage range
– Internal power MOSFET
– Internal +5 V LDO for device supply
– Up to 36 V output voltage
– Constant frequency peak current-mode
control
– 250 kHz to 1 MHz adjustable switching
frequency
– External synchronization for multi-device
application
– Pulse-skip power saving mode at light load
– Programmable soft-start
– Programmable OVP protection
– Stable with ceramic output capacitors
– Thermal shutdown
■ Backlight driver section
– Six rows with 85 mA maximum current
capability (adjustable)
– Rows disable option
– Less than 10 μs minimum dimming time
– ±2 % current matching between rows
– LED failure (open and short-circuit)
detection
Applications
■ LCD monitors and TV panels
■ PDAs panel backlight
■ GPS panel backlight
VFQFPN-24 4x4
Description
The LED7707 consists of a high efficiency
monolithic boost converter and six controlled
current generators (rows) specifically designed to
supply LEDs arrays used in the backlighting of
LCD panels. The device can manage an output
voltage up to 36 V (i.e. 10 white LEDs per row).
The generators can be externally programmed to
sink up to 85 mA and can be dimmed via a PWM
signal (1 % dimming duty-cycle at 1 kHz can be
managed). The device allows to detect and
manage the open and shorted LED faults and to
let unused rows floating. Basic protections (output
over-voltage, internal MOSFET over-current and
thermal shutdown) are provided.
Table 1.
Device summary
Order codes
LED7707
LED7707TR
Package
VFQFPN-24 4x4 (exposed pad)
Packaging
Tube
Tape and reel
September 2008
Rev 1
1/48
www.st.com
48
http://www.Datasheet4U.com
1 page  
LED7707
2 Pin settings
2.1 Connections
Figure 2. Pin connection (through top view)
Pin settings
24
1
COMP
RILIM
BILIM
FSW
MODE
AVCC
6
7
LED7706
19
18
OVSEL
PGND
ROW6
ROW5
ROW4
ROW3
13
12
5/48
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5 Page 
LED7707
5 Operation description
Operation description
The device can be divided into two sections: the boost section and the backlight driver
section. These sections are described in the next paragraphs.
Figure 3 provides an overview of the internal blocks of the device.
Figure 3. Simplified block diagram
VIN SLOPE
LDO5
COMP
BILIM
SS
SYNC
FSW
AVCC
EN
MODE
FAULT
DIM
+5V
LDO
Ramp
Generator
Current Sense
ZCD
UVLO
Detector
UVLO
Current Limit
Boost
Control
Logic
gm 0.7V
Boost_EN
OVP
_ 1.172V
+
Soft Start
Prot_EN
Ext Sync
Detector
÷2
OSC
Min Voltage
Selector
CONTROL
LOGIC
Prot_EN
Boost_EN
UVLO
CTRL6
CTRL5
CTRL4
CTRL3
CTRL2
OVP
CTRL1
VROW1
Thermal
Shutdown
1.2V
I to V
VROW6
CTRL6
VROW5
CTRL5
VROW4
CTRL4
VROW3
CTRL3
VROW2
CTRL2
Current
Generator 6
Current
Generator 5
Current
Generator 4
Current
Generator 3
Current
Generator 2
VTH,FLT
4V
MODE
LOGIC
I to V
+
_
Current
Generator 1
LX
PGND
OVSEL
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
RILIM
SGND
AM00580v1
11/48
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LED7707.PDF ] | |
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