Current Mode PWM Power Switch
OB2358P
Frequency Shuffling
GENERAL DESCRIPTION
OB2358P combines a dedicated current mode
PWM controller with a high voltage power
MOSFET. It is optimized for high performance, low
standby power, and cost effective off-line flyback
converter applications in sub 27W range.
OB2358P offers complete protection coverage
with automatic self-recovery feature including
Cycle-by-Cycle current limiting (OCP), over load
protection (OLP), over temperature protection
(OTP), over voltage protection and VDD under
voltage lockout (UVLO).
Excellent EMI
performance is
achieved
with On-Bright
proprietary frequency shuffling technique together
with soft switching control at the totem pole gate
drive output.
The tone energy at below 20KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2358P is offered in DIP8 package.
FEATURES
Power on soft start reducing MOSFET Vds
stress
■
Level 5 compliance with < 100mW standby
power at universal AC input
■
Frequency shuffling for EMI
■
Extended burst mode control for improved
efficiency and minimum standby power design
■
Audio noise free operation
■
Fixed 55KHZ (typical) switching frequency
■
Internal synchronized slope compensation
■
Low VDD startup current and low operating
current
■
Leading edge blanking on current sense input
■
Good protection coverage with auto self-
recovery
o
VDD under voltage lockout with hysteresis
(UVLO)
o
Over temperature protection (OTP)
o
On-Bright
proprietary
line
input
compensated
o
Cycle-by-Cycle
over-current
threshold
setting for constant output power limiting
over universal input voltage range.
o
Over load protection (OLP).
o
Over voltage protection(OVP)
■
APPLICATIONS
Offline AC/DC flyback converter for
■
AC/DC adapter
■
PDA power supplies
■
Digital Cameras and Camcorder Adapter
■
VCR, SVR, STB, DVD&DVCD Player SMPS
■
Set-Top Box Power
■
Auxiliary Power Supply for PC and Server
■
Open-frame SMPS
TYPICAL APPLICATION
AC IN
EMI
Filter
tc
on
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助
ig
h
Br
OB2358P
GND
GND
Drain
Drain
VDD_G
VDD
FB
Sense
O
n-
Output Power Table
Product
OB2358P
Notes:
1.
Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50
℃
ambient.
Higher output power is possible with extra added heat sink or air circulation to reduce thermal resistance.
230VAC±15%
Open Frame
1
27W
85-265VAC
Open Frame
1
16W
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_2358P00
尔
达
DC
Out
Current Mode PWM Power Switch
OB2358P
Frequency Shuffling
GENERAL INFORMATION
Pin Configuration
The OB2358P is offered in DIP8 package as
shown below.
Package Dissipation Rating
Package
RJA (℃/W)
DIP8
75
2
Note:
Drain Pin Connected to 100mm PCB copper clad.
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3V to BVdss
VDD Voltage
-0.3V to 30 V
VDD-G Input Voltage
-0.3V to 30 V
FB Input Voltage
-0.3 to 7V
Sense Input Voltage
-0.3 to 7V
Min/Max Operating Junction
-40 to 150℃
Temperature T
J
Min/Max Storage
-55 to 150℃
Temperature T
stg
Lead Temperature
260℃
(Soldering, 10secs)
Note:
Stresses beyond those listed under “absolute
Ordering Information
Part Number
Description
OB2358PAP
DIP8, Pb-free
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.
en
OB2358P
Current Mode PWM Power Switch
fid
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X
X
Package
A:DIP8
on
Marking Information
O
n-
©On-Bright Electronics
Br
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tc
Confidential
2
lt
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Package Pb-free
P : Pb-free
助
Preliminary Datasheet
OB_DOC_DS_2358P00
尔
达
Current Mode PWM Power Switch
OB2358P
Frequency Shuffling
ELECTRICAL CHARACTERISTICS
(T
A
= 25℃, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD)
VDD=11V,Measure
Istartup
VDD Start up Current
Leakage current into VDD
I_VDD_Operation Operation Current
V
FB
=3V
VDD
Under
Voltage
UVLO(ON)
Lockout Enter
VDD
Under
Voltage
UVLO(OFF)
Lockout Exit (Recovery)
Over voltage protection CS=0V,FB=3V Ramp up
OVP(ON)
voltage
VDD until gate clock is off
Feedback Input Section(FB Pin)
V
FB_
Open
V
FB
Open Loop Voltage
FB pin short circuit Short FB pin to GND and
I
FB
_Short
current
measure current
Zero Duty Cycle FB
V
TH
_0D
Threshold Voltage
Power Limiting
FB
V
TH
_PL
Threshold Voltage
Power limiting Debounce
T
D
_PL
Time
Z
FB
_IN
Input Impedance
Current Sense Input(Sense Pin)
Soft start time
Leading edge blanking
T_blanking
time
Z
SENSE
_IN
Input Impedance
From Over Current Occurs
Over Current Detection
T
D
_OC
till the gate driver output
and Control Delay
start to turn off
Internal Current Limiting
V
TH
_OC
FB=3.3V
Threshold Voltage
Oscillator
Normal
Oscillation
F
OSC
Frequency
Frequency Temperature
△f_Temp
Stability
Frequency
Voltage
△f_VDD
Stability
Maximum duty
D_max
FB=3.3V, CS =0V
cycle
Burst
Mode
Base
F_Burst
Frequency
Mosfet Section
MOSFET Drain-Source
BVdss
Breakdown Voltage
Static Drain to Source On
Rdson
Resistance
Frequency Shuffling
Frequency
Modulation
∆f_OSC
range /Base frequency
Over temperature protection
Over temperature protection trip point
Min
Typ
5
1.6
7.0
15.2
27.5
8.0
Max
20
9.0
Unit
uA
mA
V
助
4.9
5.5
0.35
0.8
4.6
50
15.7
4
270
40
80
0.72
50
0.77
55
5
5
65
75
22
600
4.4
-4
150
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©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_2358P00
尔
达
16.2
17.2
V
29
30.5
V
6.1
V
mA
V
V
mSec
Kohm
ms
ns
Kohm
nSec
0.82
60
V
KHZ
%
%
85
%
KHZ
V
5.5
4
Ώ
%
℃
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