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PDF OB3341S Data sheet ( Hoja de datos )
| Número de pieza | OB3341S | |
| Descripción | Buck LED Driver | |
| Fabricantes | On-Bright | |
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OB3341S
Buck LED Driver with High PF
GENERAL DESCRIPTION
The OB3341S is a high power factor, monolithic
Buck regulator with advanced features to provide
high efficiency control and high accuracy constant
current output for LED lighting applications.
OB3341S integrates a 2A MOSFET to decrease
physical volume. It adopts constant on time control
for power factor correction (PFC), zero current
detectors (ZCD) to ensure quasi-resonant valley
turn-on for high efficiency operation.
OB3341S offers good protection coverage
including VCC under voltage lockout (UVLO), VCC
over voltage protection, cycle-by-cycle current
limiting, over temperature protection, COMP pin
floating protection and LED open/short protection.
OB3341S is provided with DIP8 package.
FEATURES
Buck topology power switching with single
stage PFC (PF>0.9)
Integrated 2A 600V MOSFET
Quasi-resonant valley turn-on mode
operation to achieve high efficiency (>90%)
High accuracy output current (±3%)
LED open/short protection
Low power dissipation at LED short
Ultra-low start-up current (typical 5uA)
APPLICATIONS
LED lighting
Tube lighting
PAR lighting
Bulb lighting
TYPICAL APPLICATION
+Vin
OB3341S
1 VCC
DRAIN 8
2 ZCD
DRAIN 7
3 GND
SOURCE 6
4 COMP
CS 5
Figure1: OB3341S Typical Application Schematic
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_3341S00
1 page  
OB3341S
Buck LED Driver with High PF
ELECTRICAL CHARACTERISTICS
VCC=20V, TA=25℃, if not otherwise noted.
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage Section
I_Vcc_st
Startup Current
VCC = UVLO_off – 0.5V
5 15 uA
I_static
Static Current
no switching
1.5 2.5 mA
UVLO_on
VCC Under Voltage Lockout
Enter
VCC falling
8 9 10 V
UVLO_off
VCC Under Voltage Lockout
Exit
VCC rising
28 30 32 V
Vcc_ovp
VCC Over Voltage Protection
Current Sense Section
36 V
T_leb
Lead Edge Blanking Time
300 ns
Td_oc
OCP Propagation Delay
From OCP comparator to
Gate drive
100
ns
Vth_ocp
Over Current
Threshold
Protection ZCD > 0.55V
1.1 V
Vth_ocp_sh
ZCD Section
Over Current Protection
Threshold when LED short
ZCD < 0.5V
0.4 V
Vovp
Output Over Voltage Protection
3.88 4.00 4.12 V
Vth_dem_h
When ZCD rises up this voltage,
demagnetization began
0.9 V
Vth_dem_l
When ZCD drops below this
voltage,
demagnetization
finished
Constant Current Section
0.3 V
Vref EA Reference Voltage
392 400 408 mV
Gm EA Transconductance Gain
80 us
Vcomp_range COMP Dynamic Range
1.2 3.5 V
Vcomp_l
Lower Clamp Voltage
1.1 V
Isource_max EA Maximum Source Current
32 uA
Isink_max
EA Maximum Sink Current
PWM Control Section
100 uA
Toff_max
Re-start timer period
70 us
Ton_max
OTP Section
Maximum on time
20 us
OTP_on
Over Temperature Protection
Threshold
150 ℃
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_3341S00
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet OB3341S.PDF ] | |
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