No właśnie, jak w temacie: poszukuję w/wym układu lub ścisłego zamiennika. Jest to sterownik SMPS, mój pochodzi z zasilacza amplitunera HK AVR170. Jeśli znacie sklep, w którym byłyby oryginały lub ścisłe zamienniki, to także poproszę.
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
Product Specification
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
０７５５－２８７０７３４２ １３５１０２０５０８４ ＱＱ １０３３２９１０５２
GENERAL DESCRIPTION
FEATURES
OB2358L 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.
OB2358L 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.
OB2358L is offered in DIP8 package.
■
Power on Soft Start Reducing MOSFET Vds
Stress
■ Frequency shuffling for EMI
■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
■ Audio Noise Free Operation
■ Fixed 50KHZ 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 SelfRecovery
o VDD Under Voltage Lockout with Hysteresis
(UVLO)
o Over Temperature Protection (OTP)
o On-Bright
Proprietary
Line
Input
Compensated
Cycle-by-Cycle Over-current Threshold
Setting For Constant Output Power Limiting
Over Universal Input Voltage Range.
o Overload 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
Output Power Table
Product
230VAC±15%
Open Frame1
27W
85-265VAC
Open Frame1
16W
OB2358L
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.
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
０７５５－２８７０７３４２ １３５１０２０５０８４ ＱＱ １０３３２９１０５２
GENERAL INFORMATION
Package Dissipation Rating
Package
RθJA (℃/W)
DIP8
75
Note: Drain Pin Connected to 100mm2 PCB copper clad.
Pin Configuration
The OB2358L is offered in DIP8 package as
shown below.
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
Maximum Operating Junction
150℃
Temperature TJ
Min/Max
Storage
-55 to 150℃
Temperature Tstg
Lead
Temperature
260℃
(Soldering, 10secs)
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.
Ordering Information
Part Number
Description
OB2358LAP
DIP8, Pb-free
Marking Information
©On-Bright Electronics
Confidential
-2-
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
TERMINAL ASSIGNMENTS
Pin Name
GND
I/O
P
FB
I
VDD-G
SENSE
VDD
P
I
P
Drain
O
Description
Ground
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin 4.
Internal Gate Driver Power Supply
Current sense input
IC DC power supply Input
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the
transformer
BLOCK DIAGRAM
VDD_G
1
Current
Reference OTP
Soft
Driver
VDD
2
Internal supply
R
Power
MOSFET
Soft Start
Q
OCP
S
5V
UVLO
Drain
5/6
Extended
OSC
Burst mode
SENSE
4
Slope
compensation
POR
CPL
LEB
Vth
5.7V
OVP
Burst
mode
PWM Comparator
50ms
R
OLP
FB
3
R
7/8 GND
©On-Bright Electronics
Confidential
-3-
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD)
VDD Start up VDD=11V,Measure
Istartup
Current
Leakage current into VDD
Operation
VFB=3V
I_VDD_Operation
Current
VDD
Under
UVLO(ON)
Voltage Lockout
Enter
VDD
Under
UVLO(OFF)
Voltage Lockout
Exit (Recovery)
CS=0V,FB=3V
Over
voltage
Ramp up VDD until gate
OVP(ON)
protection voltage
clock is off
Feedback Input Section(FB Pin)
VFB Open Loop
VFB_Open
Voltage
FB
pin
short Short FB pin to GND and
IFB_Short
circuit current
measure current
Zero Duty Cycle
VTH_0D
FB
Threshold
Voltage
Power
Limiting
VTH_PL
FB
Threshold
Voltage
Power
limiting
TD_PL
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(Sense Pin)
Soft start time
Leading
edge
T_blanking
blanking time
ZSENSE_IN
Input Impedance
Over
Current From Over Current Occurs
TD_OC
Detection
and till the Gatedrive output
Control Delay
start to turn off
Internal Current
Limiting
FB=3.3V
VTH_OC
Threshold
Voltage
Oscillator
Normal
FOSC
Oscillation
Frequency
Frequency
△f_Temp
Temperature
Stability
Frequency
△f_VDD
Voltage Stability
Maximum duty
FB=3.3V, CS =0V
D_max
cycle
©On-Bright Electronics
Confidential
-4-
Min
Typ
Max
Unit
5
20
uA
1.6
mA
5.8
6.8
7.8
V
11.5
12.5
13.5
V
22.0
23.5
25.0
V
4.6
4.9
5.2
V
1.15
mA
0.8
V
3.7
V
50
mSec
4
Kohm
4
ms
270
ns
40
Kohm
80
nSec
0.72
0.77
0.82
V
45
50
55
KHZ
5
%
%
5
56
66
76
%
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
F_Burst
Burst Mode Base
Frequency
22
KHZ
Mosfet Section
MOSFET DrainSource
BVdss
Breakdown
Voltage
Rdson
Static, Id=1.0A
Frequency Shuffling
Frequency
∆f_OSC
Modulation range
/Base frequency
Over temperature protection
Over temperature protection trip point
©On-Bright Electronics
600
V
4.4
150
Confidential
-5-
Ώ
4
-4
5.5
%
℃
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
０７５５－２８７０７３４２ １３５１０２０５０８４ ＱＱ １０３３２９１０５２
CHARACTERIZATION PLOTS
(The characteristic graphs are normalized at Ta=25℃)
UVLO(OFF)(V) vs Temperature(℃ )
6.87
UVLO(OFF)(V)
UVLO(ON)(V)
UVLO(ON)(V) vs Temperature(℃)
6.86
6.85
6.84
6.83
-40
0
40
80
12.65
12.55
12.45
12.35
12.25
-40
120
Temperature(℃ )
VDD Current(mA)
Istartup(uA)
2.0
1.0
0.0
40
80
120
Temperature(℃ )
2.0
1.0
0.0
0.0
Vth_OC(V)
Fosc(KHz)
30
5.0
10.0
15.0
VDD Voltage(V)
20.0
25.0
Fosc(KHz) vs Temperature(℃ )
1.10
1.00
0.90
0.80
0.70
15
120
3.0
Vth_OC(V)vs duty(%)
0
80
VDD vs Operation Current
3.0
0
40
Temperature(℃ )
Istartup(uA) vs Temperature(℃ )
-40
0
45
60
60.0
40.0
20.0
0.0
-40
0
40
80
120
Temperature(℃ )
Duty(%)
Rds(on) VS Temperature(℃ )
Rds(on)
10
8
6
4
25
50
75
100
125
150
Temperature(℃ )
©On-Bright Electronics
Confidential
-6-
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
OPERATION DESCRIPTION
The OB2358L is a low power off-line SMPS
Switcher optimized for off-line flyback converter
applications in sub 27W power range. The
‘Extended burst mode’ control greatly reduces the
standby power consumption and helps the design
easily to meet the international power
conservation requirements.
The switching frequency is internally adjusted at
no load or light load condition. The switch
frequency reduces at light/no load condition to
improve the conversion efficiency. At light load or
no load condition, the FB input drops below burst
mode threshold level and device enters Burst
Mode control. The Gate drive output switches only
when VDD voltage drops below a preset level and
FB input is active to output an on state. Otherwise
the gate drive remains at off state to minimize the
switching loss and reduces the standby power
consumption to the greatest extend.
The switching frequency control also eliminates
the audio noise at any loading conditions.
• Startup Current and Start up Control
Startup current of OB2358L is designed to be very
low so that VDD could be charged up above
UVLO threshold level and device starts up quickly.
A large value startup resistor can therefore be
used to minimize the power loss yet achieve a
reliable startup in application. For AC/DC adapter
with universal input range design, a 2 MΩ, 1/8 W
startup resistor could be used together with a
VDD capacitor to provide a fast startup and yet
low power dissipation design solution.
• Oscillator Operation
The switching frequency of OB2358L is internally
fixed at 50KHZ. No external frequency setting
components are required for PCB design
simplification.
• Operating Current
The Operating current of OB2358L is low at 2mA.
Good efficiency is achieved with OB2358L low
operating current together with the ‘Extended
burst mode’ control features.
• Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in
OB2358L current mode PWM control. The switch
current is detected by a sense resistor into the
sense pin. An internal leading edge blanking
circuit chops off the sensed voltage spike at initial
internal power MOSFET on state due to snubber
diode reverse recovery and surge gate current of
internal power MOSFET so that the external RC
filtering on sense input is no longer needed. The
current limiting comparator is disabled and cannot
turn off the internal power MOSFET during the
blanking period. The PWM duty cycle is
determined by the current sense input voltage and
the FB input voltage.
• Soft Start
OB2358L features an internal 4ms soft start to
soften the electrical stress occurring in the power
supply during startup. It is activated during the
power on sequence. As soon as VDD reaches
UVLO(OFF), the peak current is gradually
increased from nearly zero to the maximum level
of 0.77V. Every restart up is followed by a soft
start.
• Frequency shuffling for EMI improvement
The frequency Shuffling (switching frequency
modulation) is implemented in OB2358L. The
oscillation frequency is modulated so that the tone
energy is spread out. The spread spectrum
minimizes the conduction band EMI and therefore
eases the system design.
• Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds voltage
ramp onto the current sense input voltage for
PWM generation. This greatly improves the close
loop stability at CCM and prevents the subharmonic oscillation and thus reduces the output
ripple voltage.
• Extended Burst Mode Operation
At light load or zero load condition, most of the
power dissipation in a switching mode power
supply is from switching loss on the MOSFET, the
core loss of the transformer and the loss on the
snubber circuit. The magnitude of power loss is in
proportion to the switching frequency. Lower
switching frequency leads to the reduction on the
power loss and thus conserves the energy.
©On-Bright Electronics
• Drive
The internal power MOSFET in OB2358L is driven
by a dedicated gate driver for power switch control.
Too weak the gate drive strength results in higher
conduction and switch loss of MOSFET while too
strong gate drive results the compromise of EMI.
A good tradeoff is achieved through the built-in
totem pole gate design with right output strength
and dead time control. The low idle loss and good
Confidential
7
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
EMI system design is easier to achieve with this
dedicated control scheme.
In addition to the gate drive control scheme
mentioned, the gate drive strength can also be
adjusted externally by a resistor connected
between VDD and VDDG, the falling edge of the
Drain output can be well controlled. It provides
great flexibility for system EMI design.
output power limit over the universal input voltage
range.
At overload condition when FB input voltage
exceeds power limit threshold value for more than
TD_PL, control circuit reacts to shut down the
switcher. Switcher restarts when VDD voltage
drops below UVLO limit. Similarly, control circuit
shutdowns the power MOSFET when an Over
Temperature condition is detected.
VDD is supplied by transformer auxiliary winding
output. When VDD voltage exceeds the internal
OVP threshold voltage (23.5V) due to abnormal
conditions, The power MOSFET is shut down until
VDD drops below 6.8V (UVLO limit) , and device
enters power on restart-up sequence thereafter.
• Protection Controls
Good power supply system reliability is achieved
with its rich protection features including Cycle-byCycle current limiting (OCP), Over Load
Protection (OLP), over voltage protection and
Under Voltage Lockout on VDD (UVLO).
With On-Bright Proprietary technology, the OCP is
line voltage compensated to achieve constant
©On-Bright Electronics
Confidential
-8-
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
０７５５－２８７０７３４２ １３５１０２０５０８４ ＱＱ １０３３２９１０５２
PACKAGE MECHANICAL DATA
8-Pin Plastic DIP
Symbol
A
A1
A2
B
B1
C
D
E
E1
e
L
E2
©On-Bright Electronics
Dimensions In Millimeters
Min
Max
3.710
0.381
2.921
0.350
5.334
4.953
0.650
Dimensions In Inches
Min
Max
0.146
0.015
0.115
0.014
1.524 (BSC)
0.210
0.195
0.026
0.06 (BSC)
0.200
9.000
6.096
7.320
0.360
10.160
7.112
8.255
2.540 (BSC)
2.921
3.810
7.620
10.920
Confidential
-9-
0.008
0.354
0.240
0.288
0.014
0.400
0.280
0.325
0.1 (BSC)
0.115
0.300
0.150
0.430
Datasheet
OB_DOC_DS_2358LA1
OB2358L
Current Mode PWM Power Switch
Frequency Shuffling
０７５５－３６９４３６２２ １５８１７２８７７６９ ＱＱ ９４８６４７６８２
IMPORTANT NOTICE
RIGHT TO MAKE CHANGES
On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and services at any time and to discontinue any product
or service without notice. Customers should obtain the latest relevant information before placing orders
and should verify that such information is current and complete.
WARRANTY INFORMATION
On-Bright Electronics Corp. warrants performance of its hardware products to the specifications
applicable at the time of sale in accordance with its standard warranty. Testing and other quality control
techniques are used to the extent it deems necessary to support this warranty. Except where mandated
by government requirements, testing of all parameters of each product is not necessarily performed.
On-Bright Electronics Corp. assumes no liability for applications assistance or customer product design.
Customers are responsible for their products and applications using On-Bright’s components, data sheet
and application notes. To minimize the risks associated with customer products and applications,
customers should provide adequate design and operating safeguards.
LIFE SUPPORT
On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to
support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or
claims resulting from the use of its products in medical applications.
MILITARY
On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright
Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in
military applications.
©On-Bright Electronics
Confidential
- 10 -
Datasheet
OB_DOC_DS_2358LA1