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OB3613
High PF Non-Isolated Buck LED Lighting Controller
GENERAL DESCRIPTION
OB3613 is a high power factor, highly integrated
buck regulator with advanced features to provide
high efficiency control and high precision constant
current output for LED lighting applications.
The proprietary CC control scheme is used and
the system can achieve high power factor with
constant on-time control scheme.
OB3613 offers comprehensive protection
coverage with auto-recovery features including
LED open loop protection, LED short circuit
protection, cycle-by-cycle current limiting, built-in
leading edge blanking, VDD under voltage lockout
(UVLO), etc.
OB3613 is offered in SOT23-6 package.
FEATURES
Buck topology with high power factor
High precision constant current regulation at
universal AC input
Low system cost and high efficiency
Quasi-Resonant operation
Programmable CC regulation
LED short circuit protection
LED open loop protection
Cycle-by-cycle current limiting
Built-in leading edge blanking (LEB)
VDD under voltage lockout with hysteresis
VDD over voltage protection
Over temperature protection (OTP)
APPLICATIONS
LED lighting
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_361300

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OB3613
High PF Non-Isolated Buck LED Lighting Controller
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOT23-6.
FB 1
6 COMP
GND 2
5 CS
VDD 3
4 GATE
Ordering Information
Part Number
Description
OB3613MP
SOT23-6, Pb-free, T&R
Note: All Devices are offered in Pb-free Package if not
otherwise noted.
Package Dissipation Rating
Package
RθJA (/W)
SOT23-6
200
Absolute Maximum Ratings
Parameter
Value
VDD Voltage
-0.3 to 40V
Gate Voltage
-0.3 to 13V
CS Input Voltage
-0.3 to 7V
FB Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-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
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Preliminary Datasheet
OB_DOC_DS_361300

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Marking Information
OB3613
High PF Non-Isolated Buck LED Lighting Controller
TERMINAL ASSIGNMENTS
Pin Num Pin Name I/O Description
1
FB
I
The voltage feedback from auxiliary winding. Connected to resistor
divider from auxiliary winding reflecting output voltage.
2
GND
P Power Ground.
3
VDD
P Power supply Input.
4
GATE
O Gate driver output for power MOSFET.
5 CS I Current sensing terminal.
6
COMP
O
Loop compensation pin. A capacitor is connected between COMP and
GND.
©On-Bright Electronics
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Preliminary Datasheet
OB_DOC_DS_361300

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BLOCK DIAGRAM
OB3613
High PF Non-Isolated Buck LED Lighting Controller
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Preliminary Datasheet
OB_DOC_DS_361300

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OB3613
High PF Non-Isolated Buck LED Lighting Controller
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=20V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
I start-up
Start up current
VDD=UVLO(OFF)-1V
I op Operation current
VDD=20V, no loading
UVLO(OFF) VDD under voltage lockout exit
UVLO(ON)
VDD under voltage lockout enter
VDD_OVP
VDD Over Voltage Protection
Current Sense Input Section
TLEB
LEB time
Vth_ocp
Over Current Threshold
FB>0.45V
FB<0.45V
FB Input Section
Vout_ovp
Output Over Voltage Protection
Vout_scp
Output Short Circuit Protection
QR Section
Fmax
Maximum Working Frequency
Toff_max
Maximum Off Time
COMP=4.2V
Toff_min
Minimum Off Time
CS>0.15V
CS<0.15V
Ton_max
Maximum On Time
COMP=4.2V
Error Amplifier Section
Vref
Error Amplifier
Voltage
Reference
Gm
Error
Transconductance
Amplifier
Isource_max
Error Amplifier Maximum Source
Current
Isink_max
Error Amplifier Maximum Sink
Current
Vclamp_COMP COMP Pin Down_clamp Voltage
Gate Driver Section
Vol Output Low Level
Iout=10mA
Voh Output High Level
Iout=10mA
Vclamp
Output up-Clamping Voltage
Tr Rising Edge Time
Cl=1nF
Tf Falling Edge Time
Cl=1nF
Min Typ. Max Unit
3 7 uA
1.5 2.2 mA
24 25.5 27 V
8 9 10 V
32 35 38 V
0.3 us
1.0 1.15 1.3 V
0.5 V
3.4 3.5 3.6 V
0.35 0.45 0.55 V
90 100 110 KHz
56 70 84 us
2 us
0.5 us
19 25 31 us
0.196 0.200 0.204 V
50 us
10 uA
50 uA
1.2 V
1V
6V
12 V
110 ns
70 ns
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_361300