LED7706 STMicroelectronics, LED7706 Datasheet - Page 10

• Manufacturer Part Number: LED7706
• Description: IC LED DRIVR WHT BCKLT 24-VFQFPN
• Manufacturer: STMicroelectronics
• Type: Backlight, White LEDr

Specifications of LED7706

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 250kHz ~ 1MHz
• Voltage - Supply: 4.5 V ~ 36 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: 24-VFQFN, 24-VFQFPN
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Operating Supply Voltage: 4.5 V to 36 V
• Maximum Supply Current: 1 mA
• Maximum Power Dissipation: 2300 mW
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• For Use With: 497-10043 - BOARD EVAL LCD BACKLIGHT LED7706497-8360 - BOARD EVAL FOR LED7707497-6445 - EVALUATION BOARD FOR LED7706
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Efficiency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Operation description
5
10/46
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.
overview of the internal blocks of the device.
Figure 3.
FAULT
FAULT
MODE
MODE
COMP
COMP
SYNC
SYNC
AVCC
AVCC
LDO5
LDO5
BILIM
BILIM
FSW
FSW
DIM
DIM
EN
EN
SS
SS
Simplified block diagram
Ext Sync
Ext Sync
Detector
Detector
Shutdown
Shutdown
Soft Start
Soft Start
Thermal
Thermal
Current Limit
Current Limit
Prot_EN
Prot_EN
CONTROL
CONTROL
Detector
Detector
LOGIC
LOGIC
VIN
VIN
UVLO
UVLO
UVLO
UVLO
LDO
LDO
+5V
+5V
1.2V
1.2V
÷2
÷2
Generator
Generator
OSC
OSC
SLOPE
SLOPE
OVP
OVP
Ramp
Ramp
Boost_EN
Boost_EN
CTRL6
CTRL6
CTRL5
CTRL5
CTRL4
CTRL4
CTRL3
CTRL3
CTRL2
CTRL2
Prot_EN
Prot_EN
UVLO
UVLO
I to V
I to V
+
+
g
g
Min Voltage
Min Voltage
m
m
+
+
+
+
_
_
Selector
Selector
CTRL1
CTRL1
V
V
ROW1
ROW1
RILIM
RILIM
+
+
_
_
0.7V
0.7V
Current Sense
Current Sense
ZCD
ZCD
Boost_EN
Boost_EN
Control
Control
Boost
Boost
Logic
Logic
CTRL6
CTRL6
CTRL5
CTRL5
CTRL4
CTRL4
CTRL3
CTRL3
CTRL2
CTRL2
V
V
V
V
V
V
V
V
V
V
ROW6
ROW6
ROW5
ROW5
ROW4
ROW4
ROW3
ROW3
ROW2
ROW2
Generator 1
Generator 1
OVP
OVP
Current
Current
4V
4V
LOGIC
LOGIC
+
+
_
_
Figure 3
Generator 6
Generator 6
Generator 5
Generator 5
Generator 4
Generator 4
Generator 3
Generator 3
Generator 2
Generator 2
MODE
MODE
Current
Current
Current
Current
Current
Current
Current
Current
Current
Current
I to V
I to V
SGND
SGND
_
_
_
+
+
+
V
V
TH,FLT
TH,FLT
1.172V
1.172V
provides an
LX
LX
PGND
PGND
OVSEL
OVSEL
ROW6
ROW6
ROW5
ROW5
ROW4
ROW4
ROW3
ROW3
ROW2
ROW2
ROW1
ROW1
LED7706
AM00596v1