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OCP8121
One-Channel High Power LED Controller with DC-DC Converter
for Large LCD Panes
General Description
The OCP8121 is single 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 OCP8121 provides one controlled LED drivers
to achieve optimum efficiency. The OCP8121 provides
PWM dimming function and analog dimming control. It
provides system design flexibility for LCD-TV with local
dimming or 3D display mode.
The OCP8121 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 OCP8121 is available in SOP-16L package,
and it is RoHS compliant and 100% lead Pb free.
Operating temperature range of the OCP8121 is from
-40°C to 85°C.
Features
Wide Supply Voltage Range: 8.0V ~ 25V
One DC-DC Controller
Number of LEDs in series limited by external
MOSFETs rating
PWM dimming control
Analog Dimming
Constant Operation Frequency
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 SOP-16L Package
Applications
LCD White LED Backlighting
LCD TVs
Automotive and Infotainment Displays
3D Mode Display LCD Panel
Pin Configuration
SOP-16L (Top View)
Figure 1, Pin Assignments of OCP8121
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Rev. 1.2 Feb .27, 2018
源于灿瑞 磁传天下

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OCP8121
Pin
Name
UVLS
VCC
EN
VREG
RSET
PWM
ADIM
TIMER
CMP
IFB
GATE
CS
OVP
GND
SWOUT
STATUS
Pin No.
SOP16L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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 PWM dimming control
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
I LED Current Sense Input
O MOSFET driver control
I Power MOSFET Switching Current Sense
I Output over-voltage protection sense
P Ground
O Boost Power MOSFET Drive Output
O Fault Operation Status Output (Open Drain Output)
Typical Application Circuit
Ordering Information
Figure 2, Typical Application Circuit of OCP8121
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Page2 - 2
Rev. 1.2 Feb .27, 2018
源于灿瑞 磁传天下