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OB3340
High PF, High CC Buck Topology LED driver
Product Specification
GENERAL DESCRIPTION
The OB3340 is a high power factor and high
constant current precision LED driver for LED
lighting applications. An analog multiplier for
power factor correction (PFC), zero current
detector (ZCD) to ensure TM operation and
a feedback circuit to achieve constant LED current,
a current sensing comparator with built-in leading-
edge blanking ensures safe operation during
short-circuit at the output, and a totem pole output
ideally suited for driving a power MOSFET.
OB3340 provides comprehensive protection
features including system VCC under voltage
lockout (UVLO), Output short\open protection,
Cycle by cycle current limiting, and gate drive
output clamping for external power MOSFET
protection.
FEATURES
High Precision Constant Output Current
Analog multiplier for High Power Factor
Correction
Low Start-up Current and Operating Current
Internal Startup Timer for Stand-alone
Applications
Transition Mode (TM) Operation
Internal Leading Edge Blanking
Cycle-by-Cycle Current Limiting
Totem Pole Output with High State Clamping
Under Voltage Lockout with Hysteresis
VCC over voltage protection
Output short/open protection
Audio Noise Free
11V to 32V wide range of VCC voltage
APPLICATIONS
LED Lighting Power
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_334000

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GENERAL INFORMATION
Terminal Assignment
In SOP8 Package.
FB 1
8
VCC
COMP
2
7 GD
MULT
3
6 GND
CS 4
5 ZCD
Ordering Information
Part Number
OB3340CP
Description
8 Pin SOP, Pb-free in Tube
OB3340CPA
8 Pin SOP, Pb-free in T&R
Package Dissipation Rating
Package
RJA (/W)
SOP8
150
OB3340
High PF, High CC Buck Topology LED driver
Absolute Maximum Ratings
Symbol
VCC
I_ZCD
CS
FB
COMP
MULT
Tj
Tstg
Lead
Temperature
Parameter
DC Supply
voltage
Zero Current
Detector Max.
Current
Analog inputs
& outputs
Min/Max
Operating
Junction
Temperature
Min/Max
Storage
Temperature
(Soldering,
10secs)
Value
Vz
50mA(source)
-10mA(sink)
-0.3 to 7V
-40 to 150
-55 to 150
260
Note: 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.
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_334000

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Marking Information
OB3340
High PF, High CC Buck Topology LED driver
YWWZZZ
OB3340CP
s
Y: Year Code
WW: Week Code (01-52)
ZZZ: Lot Code
C: SOP8
P:Pb-free
s: internal code
TERMINAL DESCRIPTIONS
Pin Num Pin Name
1 FB
2 COMP
3 MULT
4 CS
5 ZCD
6 GND
7 GD
8 VCC
I/O Description
I Input of error amplifier.
Output of error amplifier. A compensation network is placed between
O COMP and the GND pin. The voltage between COMP and GND pin
generate PWM duty cycle.
Input of multiplier. Connected to line voltage after bridge diodes via a
I resistor divider to provide sinusoidal reference voltage to the current
loop.
I Current sense input pin. Connected to MOSFET current sensing node.
I
Zero Current Detection input. When activated, A new switching cycle
starts.
P Ground pin
O Gate driver output. Drive power MOSFET.
P DC supply voltage.
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_334000

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BLOCK DIAGRAM
OB3340
High PF, High CC Buck Topology LED driver
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_334000

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OB3340
High PF, High CC Buck Topology LED driver
ELECTRICAL CHARACTERISTICS
(TA = 25if not otherwise noted)
Symbol Pin Parameter
SUPPLY VOLTAGE SECTION
Vcc 8 Operating Range
UVLO(OFF) 8
VCC under voltage
lockout exit
UVLO(ON) 8
VCC under voltage
lockout enter
Hys 8 Hysteresis
Vz
8
VCC Zener
Voltage
Clamp
Vcc_ovp 8 VCC OVP threshold
SUPPLY CURRENT SECTION
Icc-start 8 Start-up Current
Iq
8
Quiescent Current,
Switching
No
Icc 8 Operating Supply Current
ERROR AMPLIFIER SECTION
VREF
1 EA Reference
Gm EA transconductance
ICOMP
2
Source Current
Sink Current
VCOMP 2
Upper Clamp Voltage
Lower Clamp Voltage
MULTIPLIER SECTION
Vmult
3 Linear Operating Range
K Gain
CURRENT SENSE COMPARATOR
Vcs
4
Current Sense Reference
Clamp
Td(H-L) 4 Delay to Output
ZERO CURRENT DETECTOR
Vzcd
5
Input Threshold Voltage
Trigger level
Vzcd_hys
ZCD trigger Hysteresis
Vzcd
5 Upper Clamp Voltage
Vzcd
5 Lower Clamp Voltage
Izcd 5 Source Current Capability
Izcd 5 Sink Current Capability
TIMER
Tstart
Ton_max
Re-Start Timer Period
Maximum Ton
GATE DRIVE SECTION
VoL 7 Low Output Voltage
VoH 7 High Output Voltage
Tr 7 Rising Time
Tf 7 Falling Time
Voclamp 7 Output Clamp Voltage
Test Conditions
After Turn On
Icc=5mA
Vcc=11V
Vcc=14.5V
GD=1nF @ 70kHz
Vcc=14.5V
COMP=3.5V, FB=0.4V
COMP=3.5V, FB=0.6V
FB=0.4V, Comp floating
Isink=0.2mA
COMP=3.0V
Vmult=1V,
COMP=3.5V
Vmult=2.5V
COMP=5V
Izcd=2.5mA
Izcd=-2.5mA
Vcc=14.5V, Io=100mA
Vcc=14.5V, Io=100mA
Cl=1000pF, 10~90%
Cl=1000pF, 10~90%
Vcc=28V
Min
11
17.5
8.8
0.49
40
0 to 3.8
2.35
5.1
-3
3
38
30
8
Typ
19.0
10.0
9.0
38
36.5
5
1.5
3.2
0.5
60
-6
6
5.5
2.35
0.95
2.5
200
0.25
0.75
5.7
0
55
46
80
30
15
Max
32
20.5
11.2
15
2.5
6
Unit
V
V
V
V
V
V
uA
mA
mA
0.51 V
80 uS
uA
uA
V
V
V
1/V
2.65
450
V
ns
V
V
6.3 V
V
-5 mA
10 mA
72 us
68 us
1.5 V
V
150 ns
70 ns
17 V
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_334000