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OB2362
Adaptive Multi-Mode PWM Controller
GENERAL DESCRIPTION
OB2362 is a high performance flyback adaptive
multi-mode(CCM/QR) PWM controller, optimized
to achieve high efficiency and low standby power
with effective system cost.
At heavy load, the IC operates in fixed
frequency(65kHz) CCM mode in the low line input
voltage. At medium load, it operates in QR mode ,
at light load ,it operates in green mode with valley
skip, and at no load the IC operates in extended
‘burst mode’ to minimize switching loss. Lower
standby power and higher conversion efficiency is
thus achieved.
VCC low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2362.
OB2362 offers comprehensive protection
coverage with auto-recovery including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), and VCC under voltage lockout (UVLO). It
also provides the protections with latched shut
down including over temperature protection (OTP),
and over voltage protection (OVP). Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique.
The tone energy at below 25KHz is minimized in
the design and audio noise is eliminated during
operation.
OB2362 is offered in SOT23-6 package.
APPLICATIONS
Offline AC/DC flyback converter for
Power Adapter
Set-Top Box Power Supplier
Open-frame SMPS
FEATURES
Power on soft start reducing MOSFET Vds
stress
Multi-Mode Operation
CCM @ Heavy Load and Low Line
Quasi-Resonant operation @ Medium Load
Green mode with valley skip @ Light Load
Burst Mode @ No Load
Frequency shuffling for EMI
Extended burst mode control for improved
efficiency and low standby power design
Audio noise free operation
Comprehensive protection coverage
o VCC Under Voltage Lockout with
hysteresis (UVLO)
o VCC Over Voltage Protection (VCC OVP)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Over Load Protection (OLP) with auto-
recovery
o External (if NTC resistor is connected at
PRT pin)or internal Over Temperature
Protection (OTP) with latched shut down
o Output Over Voltage Protection(Output
OVP) with latched shut down, and the
OVP triggered voltage can be adjusted by
the resistor connected between auxiliary
winding and PRT pin
o Output diode short protection with auto-
recovery
TYPICAL APPLICATION
AC IN
EMI
Filter
OB2362
GND GATE
FB VCC
PRT CS
Vaux
DC
Out
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_236200

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GENERAL INFORMATION
Pin Configuration
GND
FB
PRT
1
2
3
6 Gate
5 VCC
4 CS
Ordering Information
Part Number
OB2362MP
Description
SOT23-6, Pb-free in T&R
Package Dissipation Rating
Package
RJA(/W)
SOT23-6
200
Recommended operating condition
Symbol Parameter
VCC
VCC Supply Voltage
Range
12 to 26V
OB2362
Adaptive Multi-Mode PWM Controller
Absolute Maximum Ratings
Parameter
Value
VCC DC Supply Voltage
FB Input Voltage
VOVP-1V
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
PRT Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
-40 to 150
Operating Ambient
Temperature TA
Min/Max Storage
Temperature Tstg
-40 to 85
-55 to 150
Lead
Temperature
(Soldering, 10secs)
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.
Marking Information
M:SOT23-6 P:Pb-free
Y:Year Code
WW:Week Code(01-52)
S: Internal code
ZZZ: Lot code
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_236200

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OB2362
Adaptive Multi-Mode PWM Controller
TERMINAL ASSIGNMENTS
Pin Name
VCC
CS
Gate
GND
PRT
FB
I/O Description
P Power Supply
I Current sense input
O Totem-pole gate driver output for power MOSFET
P Ground
Multiple functions pin. Connecting a NTC resistor to ground for OTP detection.
I
Connecting a resistor from Vaux can adjust OVP trigger voltage and detect
transformer core demagnetization. If both OTP and OVP are needed, a diode
should be connected between PRT pin and the NTC resistor.
I
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin CS.
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_236200

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FUNCTIONAL BLOCK DIAGRAM
OB2362
Adaptive Multi-Mode PWM Controller
VCC
GND
PRT
OVP
OVP
Valley
S
SQ
R
Logic
Control
Soft Driver
GATE
UVLO
Vref&
Iref
AVDD
Internal
blocks
OSC
Diode
short
OLP
OCP
Comparator
Temp
sense
EX OTP
EX OVP
Valley
Detector
Multi
Mode
Control
PWM
Comparator
Timer
OTP
OVP
Latch
Valley
Diode short
Diode
short
compSelonpseation
Vocp
OLP
LEB CS
AVDD
FB
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_236200

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OB2362
Adaptive Multi-Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25, VCC=18V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
Supply Voltage (VDD)
Istartup
VCC Start up Current
VCC=UVLO(OFF)-1V,
measure
leakage
current into VCC
I_VCC_Operation Operation Current
VDD=18V,CS=4V,
FB=3.5V,measure
I(VCC)
I_VCC_Burst
Burst Current
CS=0V,FB=0.5V,
measure I(VCC)
UVLO(ON)
UVLO(OFF)
VCC Under Voltage
Enter
VCC Under Voltage
Exit (Recovery)
Lockout
Lockout
6
19
Vpull-up
OVP
Pull-up PMOS active
VCC Over Voltage
threshold voltage
Protection
FB=3V,CS=0V. Slowly
ramp VCC, until no
gate switching.
26
Vlatch_release
Latch release voltage
Feedback Input Section(FB Pin)
VFB Open
VFB Open Loop Voltage
Avcs
PWM input gain VFB/VCS
Maximum
cycle
duty Max duty cycle @
VCC=18V,VFB=3V,VCS=0V
75
IFB_Short
VTH_OLP
FB pin short circuit current
Open loop protection, FB
Threshold Voltage
Short FB pin to GND
and measure current
Td_OLP
Open loop protection,
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(CS Pin)
SST_CS
Soft start time for CS peak
T_blanking
Leading edge blanking time
Td_OC
Over Current
Control Delay
Detection
From Over Current
and Occurs till the Gate
driver output start to
turn off
VTH_OC
Internal Current Limiting
Threshold Voltage with zero
duty cycle
0.43
VTH_OC_Clamp
PRT pin
IRT
OCP CS voltage clamper
Output current for external OTP
detection
95
VOTP
Ioutput_ovp
Threshold voltage for external
OTP
Current threshold for adjustable
output OVP
0.95
Typ. Max
2 10
2.5 3
0.6 0.7
78
21 23
10
27 28
5
5.1
3.5
78 81
0.3
4.4
60
16
4
300
90
0.45 0.47
0.72
100 105
1 1.05
180
Unit
uA
mA
mA
V
V
V
V
V
V
V/V
%
mA
V
ms
K
ms
ns
ns
V
V
uA
V
uA
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_236200