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OB3613Y
High PF Non-Isolated Buck LED Lighting Power Switch
GENERAL DESCRIPTION
OB3613Y 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.
OB3613Y integrates a 1.5A MOSFET to decrease
physical volume. The proprietary CC control
scheme is used and the system can achieve high
power factor with constant on-time control
scheme.
OB3613Y 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.
OB3613Y is offered in SOP8 package.
TYPICAL APPLICATION
FEATURES
Buck topology with high power factor
Integrated 1.5A 600V MOSFET
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
Figure1: OB3613Y Typical Application Schematic
Output Power Table
Product
Condition
90Vac~264Vac Input
220Vac±20% Input
OB3613Y
IOUT0.23A
7.5W
11.2W
Note: Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50ambient
and 60temperature rise. Higher output power is possible with extra added heat sink or air circulation to reduce thermal resistance.
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_3613Y00

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OB3613Y
High PF Non-Isolated Buck LED Lighting Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP8.
VDD 1
FB 2
COMP 3
8 GND
7 GND
6 DRAIN
CS 4
5 DRAIN
Ordering Information
Part Number
Description
OB3613YCP
8 Pin SOP, Pb free in Tube
OB3613YCPA
8 Pin SOP, Pb free in T&R
Note: All Devices are offered in Pb-free Package if not
otherwise noted.
Package Dissipation Rating
Package
RθJA (/W)
SOP8
90
Absolute Maximum Ratings
Parameter
Value
VDD Voltage
-0.3 to 40V
DRAIN Voltage
-0.3 to 600V
CS Input Voltage
-0.3 to 7V
FB Input Voltage
-0.3 to 7V
COMP 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.
C:SOP8
P:Pb-free
Blank:Tube
A: Tape/Reel
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_3613Y00

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BLOCK DIAGRAM
OB3613Y
High PF Non-Isolated Buck LED Lighting Power Switch
VDD
OUT OVP
OUT OVP
UVLO
VDD OVP
POR
AVDD
OVP
FB
Demag
detect QR
Inner
OTP
Vref
Reference
Timer
fmax
ramp
+
cmp
-
vref
gm Vc
RQ
SQ
OUT OVP
POR
OVP
Logic
control
Drive
CC
Control
OCP
LEB
Drain
CS
COMP
GND
©On-Bright Electronics
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Preliminary Datasheet
OB_DOC_DS_3613Y00

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Marking Information
OB3613Y
High PF Non-Isolated Buck LED Lighting Power Switch
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 VDD
2 FB
3 COMP
4 CS
5,6 DRAIN
7 GND
8 GND
I/O Description
P Power supply Input.
I
The voltage feedback from auxiliary winding. Connected to resistor
divider from auxiliary winding reflecting output voltage.
O
Loop compensation pin. A capacitor is connected between COMP and
GND.
I Current sensing terminal.
I MOSFET Drain Terminal
P Power Ground, suggest to be left floating with no pad in PCB layout.
P Power Ground
©On-Bright Electronics
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Preliminary Datasheet
OB_DOC_DS_3613Y00

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OB3613Y
High PF Non-Isolated Buck LED Lighting Power Switch
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
Power MOSFET Section
BVdss
MOSFET
Drain-Source
Breakdown Voltage
Rds,on
On resistance
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
0.45 V
100 KHz
70 us
2 us
0.5 us
25 us
0.196 0.200 0.204 V
50 us
10 uA
50 uA
1.2 V
600
6.5
V
ohm
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_3613Y00