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PDF OB3350 Data sheet ( Hoja de datos )
| Número de pieza | OB3350 | |
| Descripción | Cost Effective LED Controller | |
| Fabricantes | On-Bright | |
| Logotipo |  |
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 1. PDF - LED Controller, SOP8  Hay una vista previa y un enlace de descarga de OB3350 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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OB3350
Cost Effective LED Controller
GENERAL DESCRIPTION
OB3350 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 OB3350 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 OB3350 offers external low frequency PWM
(LPWM) dimming method for a wide range of
dimming control.
The OB3350 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
Current Mode PWM Controller With Good
Dynamic Response
8V to 35V Input Voltage Range
External PWM Dimming Mode
Over Voltage Protection
Over Current Protection
Under Voltage Lockout (UVLO)
Thermal Shutdown
APPLICATIONS
LCD Monitor
LCD TV
Flat panel display
The OB3350 is offered in SOP-8 Packages.
TYPICAL APPLICATION
Figure1. OB3350 Typical Application Schematic
©On-Bright Electronics
Confidential
-1-
Preliminary datasheet
OB_DOC_DS_335000
Free Datasheet http://www.datasheetlist.com/
1 page  
OB3350
Cost Effective LED Controller
Electrical Characteristics
VDDH=12V,PWM=5V, TA=25 , if not otherwise noted.
Parameter
Symbol
Conditions
Min Typ Max Units
Current Consumption
Input voltage range
Operating supply current
Stand by current
IVDD
IVDD _ STB
Vin=12V,PWM=5V no
load
PWM low >50ms sleep
mode
8
-
-
- 35
2.5 3
310 400
V
mA
uA
VDD UVLO
UVLO
UVLO Hysteresis
UVLO(ON)
UVLO(Hys)
6 78 V
500 mV
Soft start
Soft start slope
I sst _ slop
400 mV/mS
PWM Control
Operating frequency
Max duty cycle
PWM Input Threshold
FOSC
Dmax
PWM(high)
PWM(low)
High Level
Low Level
175 200 225 KHz
93 95 97 %
2.5 V
1.3 V
Error Amplifier
Reference voltage
Open loop voltage gain
Transconductance of EA
Vref _ ea
Am
Gm
Reference voltage at
non-inverting input
0.289
0.3
0.311 V
70 dB
80 100 120 uA/V
Output source current
I source
24 30 36 uA
Output sink current
I sin k
48 60 72 uA
Protection Threshold
OVP
OCP
VOVP OV
Vth_OCP
Threshold of output
over voltage
Threshold of over
current
protection
(duty=90%)
1.8
2.0 2.2
330
V
mV
OTP ON
TOTP _ ON
140 160 180
OTP OFF
TOTP _ OFF
120 140 160
Connect detect time
OVP UVLO threshold
Tdio
VOVP UV
Normal operation
System startup
1 mS
200 mV
100 mV
Gate Driver Output
Gate rise time
Trise 500pF load
-
40 80
ns
Gate fall time
T fall 500pF load
20 40
ns
©On-Bright Electronics
Confidential
-5-
Preliminary datasheet
OB_DOC_DS_335000
Free Datasheet http://www.datasheetlist.com/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet OB3350.PDF ] | |
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