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PDF OB3370N Data sheet ( Hoja de datos )
| Número de pieza | OB3370N | |
| Descripción | Cost Effective LED Controller | |
| Fabricantes | On-Bright | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OB3370N (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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OB3370N
Cost Effective LED Controller
GENERAL DESCRIPTION
OB3370N is a high integrated and cost effective
Light Emitting Diode (LED) driver optimized for
LCD monitor and LCD TV backlight application.
The OB3370N operates in voltage mode boost
topology with fixed frequency 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 200mV, the error is amplified to control the
pulse width of the power switch thus to regulate
the current flowing the LED.
It offers both internal burst and external low
frequency PWM (LPWM) dimming methods for a
wide range of dimming control.
OB3370N integrates under voltage lockout (VCC
UVLO) and output over voltage protections that
prevent the damage in the event of abnormal
conditions. The output voltage level is monitored
through OVP pin and it turns off the converter if an
over voltage condition is present due to an open
circuit condition.
The OB3370N is available in SOP-8 Packages.
Product Specification
FEATURES
Voltage Mode PWM Controller
Flexible Dimming Mode Control:
| Internal burst dimming control
| External burst (LPWM) dimming control
0-2V DC voltage direct dimming control
without external circuits
Output Over Voltage Protections
Under Voltage Lockout
Soft Start
APPLICATIONS
LCD Monitor
LCD TV
Flat panel display
TYPICAL APPLICATION
Figure1. OB3370N Typical Application Schematic
©On-Bright Electronics
Confidential
-1-
OB_DOC_DS_3370NA0
1 page  
OB3370N
Cost Effective LED Controller
Electrical Characteristics
VDD=5V, TA=25℃, if not otherwise noted.
Parameter
Symbol
Conditions
Min Typ Max Units
Current Consumption
Input voltage range
Operating supply current
Operating supply current
Vdd
IVDD No loading, CMP=5V
IVDD Cload=2nF, CMP=5V
4.5 -
5.5 V
- 3.5 5 mA
- 7 9 mA
VDD UVLO
UVLO on
3.6 V
UVLO off
4.4 V
Soft start
Soft start current
ISST
3 uA
PWM Control
Operating frequency
Max duty cycle for OB3370N
Error Amplifier
Reference voltage
Open loop voltage gain
Transconductance of EA
Output source current
Output sink current
PWM Dimming
Burst frequency
Max. burst duty
External LPWM duty
FOP
Dmax
- 300 - KHz
92.5 %
Vref_EA
Am
Gm
Isource
Isink
Reference
voltage
non-inverting input
at
0.2
60
33
60
-120
V
dB
umho
uA
uA
Dburst_max
CBF/DMOD=22nF
CBF/DMOD=22nF, DIM<0.2V
BF/DMOD=0V
180 200 220 Hz
- 100 - %
0 - 100 %
External LPWM Logic input level
high BF/DMOD=0V
low BF/DMOD=0V
2.0 V
0.8 V
Protection Threshold
OVP
Gate Driver Output
Gate
Vth_ovp
Threshold of output over
voltage
2.0
V
RON
Isink/Isource=70mA
- 8 12 ohm
©On-Bright Electronics
Confidential
-5-
OB_DOC_DS_3370NA0
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet OB3370N.PDF ] | |
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