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OCP8108A
One-Channel High Power LED Controller
General Description
The OCP8108A is a high power LED driver,
non-synchronous boost controller. Ideal for use, the
OCP8108A can powered the LED backlight in LCD
panels. It contains all of the features needed to
implement single ended primary topologies.
The OCP8108A is suitable for topologies which
require a ground source N-channel FET including boost,
SEPIC and various LED driver applications.
The device features include programmable
oscillator frequency, power MOSFET over-current
protection (OCP), over-voltage protection (OVP),
under-voltage lock-out (UVLO) and Over Temperature
protection (OTP). A soft-start feature is provided to
minimize in-rush current during start-up.
The OCP8108A is available in SOP-8L package,
and it is RoHS compliant. Operating temperature range
of the OCP8108A is from -40°C to 85°C.
Features
Wide Supply Voltage Range: 10.0V ~ 25.0V
For Boost, SEPIC, LED Driver Applications
Number of LEDs in series limited by external
MOSFETs rating
External enable control
EN PWM Dimming Control
Frequency adjustable: 100KHz ~ 800KHz
Over-voltage 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
CS
RSET
GND
SWOUT
Pin No.
SOP-8L
1
2
3
4
5
6
7
8
Figure 1, Pin Assignments of OCP8108A
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 Current/Voltage sense pin
I/O Resistor to set operation frequency
P Ground
O Boost Power MOSFET Drive Output
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Ver 1.1 Feb .27, 2018
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OCP8108A
Typical Application Circuit
VIN
L1 33uH
D1 SS2150
VOUT
VCC(10V-25V)
EN/PWM
+ C1
47uF/50V
C7
NC
C3
1uF
C4
47nF
R14
NC
U1
1 VCC
SWOUT 8
R2 10
2 EN
3 CMP
GND 7
R4 18K
RSET 6
4 IFB
CS 5
OCP8108A
C5
100pF
R7
Q1 100K
PO420AD
C8 C2
1uF NC
R6
R5 0.15
20K D2
VZ
R8
18K
C6
100pF
R9
WLED
WLED
VOVP=(0.5V+VZ)*(1+R7/R8)
EN PWM Dimming Mode
50K R10
1
Figure 2A, EN PWM Dimming Typical Application Circuit of OCP8108A
VIN
L1 33uH
D1 SS2150
VOUT
VCC(10V-25V)
EN
PWM-5V D3
+ C1
47uF/50V
C7
NC
C3
1uF
R14
NC C4
100nF
U1
1
VCC
8
SWOUT
R2 10
2 EN
3 CMP
GND 7
R4 18K
RSET 6
R5
20K
4 IFB
CS 5
OCP8108A
C5
100pF
Q1
P0420AD
+ C8
C2 47uF
NC
R7
100K
R6
0.15
D2 R8
18K
VZ
C6
100pF
WLED
WLED
IN4148 R3 820K
R9 36K
VOVP=(0.5V+VZ)*(1+R7/R8)
Dimming Method:IFB PWM Dimming
R10
1
Figure 2B, IFB PWM Dimming Typical Application Circuit of OCP8108A
Ordering Information
Part Number
OCP8108ASAD
Package Type
SOP-8L
Package Qty Temperature
13-in reel
2500pcs/reel
-4085
Eco Plan
Green
Lead
Cu
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Ver 1.1 Feb .27, 2018
源于灿瑞 磁传天下