OB2362C
Adaptive Multi-Mode PWM Controller
GENERAL DESCRIPTION
OB2362C is a highly integrated current mode
PWM control IC optimized for high performance,
low standby power and cost effective offline
flyback converter applications.
At full loading, the IC operates in fixed frequency
(65KHz) mode. When the loading goes low, it
operates in Green mode with valley switching for
high power conversion efficiency. When the load is
very small, the IC operates in ‘Extended Burst
Mode’ to minimize the standby power loss. As a
result, high conversion efficiency can be achieved
in the whole loading range.
VCC low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2362C.
OB2362C offers comprehensive protection
coverage with auto-recovery including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), VCC under voltage lockout (UVLO), 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 23KHz is minimized in
the design and audio noise is eliminated during
operation.
OB2362C is offered in SOT23-6 package.
FEATURES
■
■
■
■
■
■
TYPICAL APPLICATION
O
n-
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©On-Bright Electronics
ig
ht
Offline AC/DC flyback converter for
■
General power supply
■
Power Adapter
co
APPLICATIONS
Power on soft start reducing MOSFET Vds
stress
Multi-Mode Operation
65KHz fixed frequency mode @ Full Load
Valley switching operation @ Green mode
Burst Mode @ Light Load & 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
Brownout protection with auto-recovery
o
Line Over Voltage Protection(Line OVP)
o
Output Over Voltage Protection(Output
OVP) with auto-recovery, and the OVP
triggered voltage can be adjusted by the
resistors connected between auxiliary
winding and ground
o
Output diode short protection with auto-
recovery
nf
id
en
t
Confidential
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Datasheet
OB_DOC_DS_2362CA0
狮
OB2362C
Adaptive Multi-Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
Absolute Maximum Ratings
Parameter
Value
VCC DC Supply Voltage
FB Input Voltage
V
OVP
-1V
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-40 to 150
℃
GND
FB
DEM
1
2
3
6
5
4
Gate
VCC
CS
CS Input Voltage
DEM Input Voltage
Min/Max Operating
Junction Temperature TJ
Operating Ambient
Temperature T
A
Min/Max Storage
Temperature Tstg
Recommended operating condition
Symbol Parameter
Range
VCC
VCC Supply Voltage
12 to 26V
nf
id
OB2362C
High Performance Current Mode PWM
Controller
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Marking Information
Br
O
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362YWW
. ZZZC
S
Y:Year Code
WW:Week Code(01-52)
ZZZ: Lot code
C:Character Code
S: Internal code
©On-Bright Electronics
en
t
X
X
Package
M:SOT23-6
“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.
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P:Pb-free
Package Dissipation Rating
Package
RJA(℃/W)
SOT23-6
200
Lead
Temperature
260
℃
(Soldering, 10secs)
Note:
Stresses beyond those listed under
Package Pb-free
to
Ordering Information
Part Number
Description
OB2362CMP
SOT23-6, Pb-free in T&R
飞
Datasheet
OB_DOC_DS_2362CA0
狮
-40 to 85
℃
-55 to 150
℃
OB2362C
Adaptive Multi-Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(T
A
= 25℃, VCC=18V, unless otherwise noted)
Symbol
Parameter
Supply Voltage (VDD)
Istartup
VCC Start up Current
Test Conditions
VCC=UVLO(OFF)-1V,
measure
leakage
current into VCC
VDD=18V,CS=4V,
FB=3.5V,measure
I(VCC)
CS=0V,FB=0.5V,
measure I(VCC)
Min Typ.
Max Unit
2
5
uA
I_VCC_Operation
I_VCC_Burst
UVLO(ON)
UVLO(OFF)
Vpull-up
Operation Current
Burst Current
VCC Under Voltage Lockout
Enter
VCC Under Voltage Lockout
Exit (Recovery)
Pull-up PMOS active
狮
2.6
0.6
7.3
17
10
26.5 28
6.8
16
18
5.1
3.5
77
80
2.1
1.33
1.23
0.21
4.4
60
30
2.5
300
90
83
0.43 0.45
0.72
110
100
95
3.1
0.7
7.8
mA
mA
V
V
V
FB=3V,CS=0V. Slowly
VCC Over Voltage Protection
OVP
ramp VCC, until no
threshold voltage
gate switching.
Feedback Input Section(FB Pin)
V
FB_
Open
V
FB
Open Loop Voltage
Avcs
PWM input gain
∆VFB/∆VCS
Maximum
duty Max
duty
cycle
@
cycle
VCC=18V,VFB=3V,VCS=0V
The threshold enter green
Vref_green
mode
Vref_burst_H
The threshold exits burst mode
The threshold enters burst
Vref_burst_L
mode
Short FB pin to GND
I
FB
_Short
FB pin short circuit current
and measure current
Open loop protection, FB
V
TH
_OLP
Threshold Voltage
Open loop protection,
Td_OLP
Debounce Time
Z
FB
_IN
Input Impedance
Current Sense Input(CS Pin)
SST_CS
Soft start time for CS peak
T_blanking
Leading edge blanking time
From Over Current
Over Current Detection and Occurs till the Gate
Td_OC
Control Delay
driver output start to
turn off
Internal
Current
Limiting
V
TH
_OC
Threshold Voltage with zero
duty cycle
V
TH
_OC_Clamp
OCP CS voltage clamper
DEM pin
Ibrown-in
Brown-in threshold current
Ibrown-out
Brown-out threshold current
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29.5 V
nf
id
V
V/V
%
V
V
V
mA
V
ms
KΩ
ms
ns
ns
O
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co
0.47 V
V
uA
uA
105
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2362CA0
嵌入式系统
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