OCP8123A Controller Datasheet

OCP8123A Datasheet, PDF, Equivalent


Part Number

OCP8123A

Description

One-Channel High Power LED Controller

Manufacture

Orient Chip

Total Page 3 Pages
Datasheet
Download OCP8123A Datasheet


OCP8123A
OCP8123/A
One-Channel High Power LED Controller
General Description
OCP8123 is a highly integrated and cost effective
Light Emitting Diode (LED) driver optimized for LCD
monitor and LCD TV backlighting application. It provides
a high performance LED backlight solution with
minimized BOM count. The OCP8123 contains a PWM
boost driver which uses current mode control and fixed
frequency operation to regulate the LED current. The
LED current is sensed through an external current sense
resistor. The voltage across the sensing resistor is
compared with reference level of 300mv the error is
amplified to control the pulse width of the power switch
thus to regulate the current flowing the LED.
The OCP8123 offers external low frequency PWM
(LPWM) dimming method for a wide range of dimming
control. The OCP8123 offers comprehensive protection
such as power MOSFET over current protection (OCP),
output over voltage protection (OVP), IC power supply
under voltage lockout (UVLO), and LED open protection.
Features
Wide Supply Voltage Range: 8.0V ~ 35V
For Boost, SEPIC, LED Driver Applications
Number of LEDs in series limited by external
MOSFETs rating
Current Mode PWM Controller With Good
Dynamic Response
External PWM Dimming Mode
LED- to Ground Short-circuit Protection
Inductor Short-circuit Protection
Boost Diode Open Protection
Boost Diode Short-circuit Protection
Over Voltage Protection(Open-LED Protection)
Over Current Protection
Low in-rush Current Soft-start Function
Under Voltage Lockout (UVLO)
Thermal Shutdown
Low Standby Current (<1uA)
Available in SOP-8L Package
Applications
LCD Monitor
LCD TV
Flat panel display
Pin Configuration
SOP-8L (Top View)
Pin
Name
VIN
GATE
GND
CS
FB
COMP
OVP
PWM
Pin No.
SOP-8L
1
2
3
4
5
6
7
8
Figure 1, Pin Assignments of OCP8123
I/O Pin Function
P Input Power for controller and internal MOSFET driver
I Gate Driver Output Pin
G Ground
I Current/Voltage sense pin
I LED Current Sense Input
I Output of the error amplifier
I Output over-voltage protection sense
I External PWM Dimming Control
Page1 - 3
Rev. 1.3 Feb .27, 2018

OCP8123A
Typical Application Circuit
VIN
+
VCC
OCP8123
1
VIN
2
GATE
ON /OFF
PW M
8 PWM
CS 4
6 COMP
OVP 7
3
GND
5
FB
OCP8123/A
LED+
+ LED-
Figure 2, EN PMM Dimming Typical Application Circuit of OCP8123/A
VIN
VCC
+
OCP8123
1
VIN
2
GATE
LED+
+
LED-
ON /OFF
8 PWM
CS 4
6 COMP
OVP 7
3
GND
5
FB
PWM
Figure 2A, FB PWM Dimming Typical Application Circuit of OCP8123/A
Page2 - 3
Rev. 1.2 Jun 26, 2016
源于灿瑞 磁传天下


Features WWW.ORIENT-CHIP.COM OCP8123/A One-Chan nel High Power LED Controller ◼ Gene ral Description OCP8123 is a highly int egrated and cost effective Light Emitti ng Diode (LED) driver optimized for LCD monitor and LCD TV backlighting applic ation. It provides a high performance L ED backlight solution with minimized BO M count. The OCP8123 contains a PWM boo st driver which uses current mode contr ol and fixed frequency operation to reg ulate the LED current. The LED current is sensed through an external current s ense resistor. The voltage across the s ensing resistor is compared with refere nce level of 300mv the error is amplifi ed to control the pulse width of the po wer switch thus to regulate the current flowing the LED. The OCP8123 offers ex ternal low frequency PWM (LPWM) dimming method for a wide range of dimming con trol. The OCP8123 offers comprehensive protection such as power MOSFET over cu rrent protection (OCP), output over vol tage protection (OVP), IC power supply under voltage lockout (U.
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