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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
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Preliminary Datasheet
OB_DOC_DS_3341S00

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GENERAL INFORMATION
Terminal Assignment
In DIP8 Package.
VCC
ZCD
GND
COMP
1
2
3
4
8 DRAIN
7 DRAIN
6 SOURCE
5 CS
Ordering Information1
Part Number
Description
OB3341SAP-H 8 Pin DIP, Pb free in Tube
Note1: All Devices are offered in Pb-free Package if not
otherwise noted.
OB3341S
Buck LED Driver with High PF
Package Dissipation Rating
Package
RθJA (/W)
DIP8
75
Absolute Maximum Ratings2
Parameter
VCC Input Voltage to GND
ZCD to GND3
COMP, and CS to GND
Operating Ambient Temp. TA
Operating Junction Temp. TJ
Min/Max Storage Temp. Tstg
Lead Temp. (10 Sec)
Value
-0.3V to 40V
-1V to 7V
-0.7V to 7V
-20~ 85
-40 ~150
-55 ~150
260
Note2: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Note3: Rating value refers to DC only. For small duty cycle
pulse in less than 3%, negative spike value is relaxed to -1.2V.
OB3341S X X - X
Buck LED Driver with High PF
Package Package Pb free BVdss
A:DIP8
P:Pb-free
H: 650V
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_3341S00

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MARKING INFORMATION
OB3341S
Buck LED Driver with High PF
YWWZZZ
OB3341AP
S
s
Y: Year Code
WW: Week Code (01-52)
ZZZ:Lot Code
A: DIP8
P:Pb-free Package
S:Character Code
s: Internal Code(Optional)
TERMINAL ASSIGNMENT
Number
Pin Name Pin Function
1
VCC
DC supply voltage pin.
Zero current detection pin. When activated, a new switching cycle starts.
2
ZCD
Connect this pin through resistor divider from the auxiliary winding to ground.
This pin is also used for output over voltage protection (OVP).
3
GND
Ground pin.
4
COMP
Loop compensation pin. Connect to a compensation network to stabilize the
LED driver and achieve a constant LED driver current.
5 CS Current sense input pin.
6 SOURCE Source of intergraded MOSFET
7,8
DRAIN
Drain of intergraded MOSFET
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Preliminary Datasheet
OB_DOC_DS_3341S00

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FUNCTIONAL BLOCK DIAGRAM
OB3341S
Buck LED Driver with High PF
VCC
UVLO &
Reference
+
Vth_VCC_ovp _
ZCD
ZCD Sense
PWM
VCC_ovp
ZCD_ovp
ZCD_sense
PWM
OTP
OTP
Logic
Control
Gate
Drive
Vref
Iref
PFC
PFC
Constant
Current
Regulation
Vref
DRAIN
SOURCE
CS
COMP
GND
Figure2: OB3341S Functional Block Diagram
©On-Bright Electronics
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Preliminary Datasheet
OB_DOC_DS_3341S00

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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