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OCP8122A
Dual-Channel high Power LED Controller with DC-DC Converter
For Large LCD or 3D Display Panels
General Description
The OCP8122A is dual channel LED driver
controller IC which loads the boost DC-DC controller
and the constant current control of LED driver designed
to build LED backlight for 3D LCD display mode
large-size LCD TV application.
The OCP8122A provides two independently
controlled LED drivers to achieve optimum efficiency.
The drive outputs are phase-shifted by 180 degree to
minimize current ripple in high power applications. The
OCP8122A provides independent PWM dimming
function for each channel and common analog dimming
control for both channels. It provides system design
flexibility for LCD-TV with local dimming or 3D display
mode.
The OCP8122A can be configured for Master-Slave
operation to support multi-channel applications.
Synchronization is achieved by a proprietary single-wire
interface which minimizes system components.
The OCP8122A provides the over-voltage
protection (OVP), Power MOSFET over-current
protection (OCP), Output to ground short-circuit
protection, output over load protection, Soft-Start (SS),
under-voltage lock-out (UVLO), limited current condition
(LCC) protection, thermal shutdown protection (TSD). A
soft-start feature is provided to minimize in-rush current
during start-up.
The OCP8122A is available in SSOP-24L and
SOP-24L package, and it is RoHS compliant and 100%
lead Pb-free. Operating temperature range of the
OCP8122A is from -40°C to 85°C.
Features
Wide Supply Voltage Range: 8.0V ~ 25V
Dual Channel DC-DC Controller
Drives One String of High Power LEDs per
Channel
Number of LEDs in series limited by external
MOSFETs rating
180 degree phase shift drive output between the
two channel
Independent PWM dimming control for each
channel
Common Analog Dimming for two channel
Constant Operation Frequency
Operation Frequency Synchronization
External Power MOSFET Over-Current
Protection
External enable control
Integrated high frequency oscillator
Over-voltage protection
Output to Return Short-circuit Protection
Output to Ground Short-circuit Protection
Output Over-Load Protection
Limited Current Condition Protection
Low in-rush current soft-start function
Under-voltage lock-out
Thermal shutdown
Fault Status Output
Low Standby current
TA= -40 ~ 85
Available in SSOP-24L and SOP-24L Package
Applications
LCD White LED Backlighting
LCD TVs
Automotive and Infotainment Displays
3D Mode Display LCD Panel
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Rev. 1.3 Feb .27, 2018
源于灿瑞 磁传天下

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OCP8122A
Dual-Channel high Power LED Controller with DC-DC Converter
For Large LCD or 3D Display Panels
Pin Configuration
SSOP-24L/SOP-24L (Top View)
Pin
Name
UVLS
VCC
EN
VREG
RSET
SYNC
PWM1
PWM2
ADIM
TIMER
CMP1
Pin No.
SSOP24L
/SOP24L
1
2
3
4
5
6
7
8
9
10
11
CMP2
IFB2
GATE2
OVP2
CS2
IFB1
GATE1
OVP1
CS1
GND
SWOUT2
SWOUT1
STATUS
12
13
14
15
16
17
18
19
20
21
22
23
24
Figure 1, Pin Assignments of OCP8122A
I/O Pin Function
I Power Supply Under-Voltage Lock-out Detection pin
P Input Power for controller and internal MOSFET driver
I ON/OFF control for the controller
I/O Internal Regulation Output Voltage pin
I/O Resistor to set operation frequency and master/slave mode
I/O Operation Frequency Synchronization Signal input / output
I PWM dimming control for channel 1
I PWM dimming control for channel 2
I Analog dimming control for the controller
I/O Capacitor Setting shutdown delay time
I/O
Connect resistor and capacitor to set soft start and compensation for
channel 1
I/O
Connect resistor and capacitor to set soft start and compensation for
channel 2
I Channel 2 LED Current Sense Input
O Channel 2 MOSFET driver control
I Channel 2 Output over-voltage protection sense
I Channel 2 Power MOSFET Switching Current Sense
I Channel 1 LED Current Sense Input
O Channel 1 MOSFET driver control
I Channel 1 Output over-voltage protection sense
I Channel 1 Power MOSFET Switching Current Sense
P Ground
O Channel 2 Boost Power MOSFET Drive Output
O Channel 1 Boost Power MOSFET Drive Output
O Fault Operation Status Output (Open Drain Output)
Page2 - 3
Rev. 1.3 Feb .27, 2018
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OCP8122A
Dual-Channel high Power LED Controller with DC-DC Converter
For Large LCD or 3D Display Panels
Typical Application Circuit
Figure 2, Typical Application Circuit of OCP8122A
Part Number
OCP8122SAD
OCP8122SD
OCP8122SSAD
OCP8122SSD
Package Type
SOP-24L
SOP-24L
SSOP-24L
SSOP-24L
Ordering Information
Package Qty
13-in reel
1000pcs/reel
Tube
30pcs/tube
13-in reel
2500pcs/reel
Tube
58pcs/tube
Temperature
-4085
-4085
-4085
-4085
Eco Plan
Green
Green
Green
Green
Lead
Cu
Cu
Cu
Cu
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Rev. 1.3 Feb .27, 2018
源于灿瑞 磁传天下