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OCP8109A
One-Channel High Power LED Controller
General Description
The OCP8109A is a high power LED driver,
non-synchronous boost controller. The OCP8109A can
use for the LED backlight in LCD panels. It is designed
for current mode control power converters that require a
single drive output, such as boost LED driver and
SEPIC topologies.
The OCP8109A is suitable for topologies which
require a ground source N-channel FET including boost,
SEPIC and various LED driver applications.
The device features include power MOSFET
over-current protection (OCP), over-voltage protection
(OVP), under-voltage lock-out (UVLO), output to
ground short-circuit protection (SCP) and Over
Temperature protection (OTP). A soft-start feature is
provided to minimize in-rush current during start-up.
The OCP8109A is available in SOP-8L package,
and it is RoHS compliant. Operating temperature range
of the OCP8109A is from -40°C to 85°C.
Features
Wide Supply Voltage Range: 10V ~ 25V
For Boost, SEPIC, LED Driver Applications
Number of LEDs in series limited by external
MOSFETs rating
External Enable Control
EN/PWM Filter Dimming Control
105KHz Fixed Operation Frequency
Over-voltage Protection (Open-LED Protection)
Output to Ground Short-circuit Protection
Boost Diode Open Protection
Power MOSFET Current Limited
Low in-rush Current Soft-start Function
Under-voltage Lock-out
Thermal Shutdown
Low Standby Current
TA= -40 ~ 85
Available in SOP-8L Package
Applications
LCD White LED Backlighting
LCD TVs
Automotive and Infotainment Displays
Battery Powered Systems
Industrial Control Systems
Pin Configuration
SOP-8L (Top View)
Pin
Name
VCC
EN
CMP
IFB
OVP
CS
GND
SWOUT
Pin No.
SOP-8L
1
2
3
4
5
6
7
8
Figure 1, Pin Assignments of OCP8109A
I/O Pin Function
P Input Power for controller and internal MOSFET driver
I ON/OFF control for the controller
I/O Output of the error amplifier
I LED Current Sense Input
I Output over-voltage protection sense
I Current/Voltage sense pin
P Ground
O Boost Power MOSFET Drive Output
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Ver. 1.1 Feb .27, 2018
源于灿瑞 磁传天下

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OCP8109A
Typical Application Circuit
VIN
HI
+ C1
47uF
C2
NC
L1
33uH
VCC
HI
EN
LO
DIODE
D2
LO
PWM R14 10K
C3
1uF
C5
1.0nF
R1
1K
C4
0.47uF
U1
1
VCC
8
SWOUT
2 EN
GND 7
3 CMP
CS 6
4 IFB
OVP 5
OCP8109A
R7 10K
D1 SS2150
VOUT
R2 10
Q1
P0420AD
R4
560K
+ C6
47uF
WLED
C7
0.1uF or NC
R3
R9 0.15
10K
D3
NC
R5
10K C8
20nF
WLED
R10 10K
R8 10K
Q2
D4 DIODE
R6
1.5
VIN
VCC(10V-25V)
EN
Figure 2A, EN PWM Dimming Typical Application Circuit of OCP8109A
L1 D1 SS2150
VOUT
+ C1
47uF
C3
1uF
C5
33nF
R1
10K
C4
0.47uF
C2 33uH
NC
U1
1
VCC
8
SWOUT
2 EN
GND 7
3 CMP
CS 6
4 IFB
OVP 5
OCP8109
R2 10
R9
1K
PWM
R11
10K
C9
10uF
R4
Q1 100K
P0420AD
+ C6
47uF
C7
NC
R3
0.15
R5 C8
18K
100pF or NC
R7
R10
5.1K
75K
WLED
WLED
R6
1.5
Figure 2B, PWM Filter Dimming Typical Application Circuit of OCP8109A
Ordering Information
Part Number
OCP8109ASAD
OCP8109ASD
Package Type
SOP-8L
SOP-8L
Package Qty
13-in reel
2500pcs/reel
100pcs/Tube
Temperature
-4085
-4085
Eco Plan
Green
Green
Lead
Cu
Cu
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Ver. 1.1 Feb .27, 2018
源于灿瑞 磁传天下