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OB2358L 데이터시트 PDF




On-Bright Electronics에서 제조한 전자 부품 OB2358L은 전자 산업 및 응용 분야에서
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PDF 형식의 OB2358L 자료 제공

부품번호 OB2358L 기능
기능 Current Mode PWM Power Switch
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OB2358L 데이터시트, 핀배열, 회로
OB2358L
Current Mode PWM Power Switch Frequency Shuffling
Product Specification
GENERAL DESCRIPTION
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.
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
FEATURES
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 Self-
Recovery
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)
Output Power Table
Product
OB2358L
230VAC±15%
Open Frame1
27W
85-265VAC
Open Frame1
16W
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 pdf, 반도체, 판매, 대치품
OB2358L
Current Mode PWM Power Switch Frequency Shuffling
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD)
Istartup
VDD Start
Current
I_VDD_Operation
Operation
Current
up VDD=11V,Measure
Leakage current into VDD
VFB=3V
5 20
1.6
uA
mA
UVLO(ON)
VDD
Under
Voltage Lockout
Enter
5.8 6.8 7.8 V
UVLO(OFF)
VDD
Under
Voltage Lockout
Exit (Recovery)
11.5 12.5 13.5 V
OVP(ON)
Over
voltage
protection voltage
CS=0V,FB=3V
Ramp up VDD until gate
clock is off
22.0
23.5
25.0
V
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop
Voltage
IFB_Short
FB pin short
circuit current
Short FB pin to GND and
measure current
4.6
4.9 5.2
1.15
V
mA
VTH_0D
Zero Duty Cycle
FB Threshold
Voltage
0.8 V
VTH_PL
Power Limiting
FB Threshold
Voltage
3.7 V
TD_PL
Power limiting
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(Sense Pin)
Soft start time
50 mSec
4 Kohm
4 ms
T_blanking
ZSENSE_IN
TD_OC
VTH_OC
Leading edge
blanking time
Input Impedance
Over
Current
Detection and
Control Delay
Internal Current
Limiting
Threshold
Voltage
From Over Current Occurs
till the Gatedrive output
start to turn off
FB=3.3V
0.72
270
40
80
0.77
0.82
ns
Kohm
nSec
V
Oscillator
FOSC
Normal
Oscillation
Frequency
45 50 55 KHZ
f_Temp
Frequency
Temperature
Stability
5%
f_VDD
D_max
Frequency
Voltage Stability
Maximum duty
cycle
FB=3.3V, CS =0V
5%
56 66 76 %
©On-Bright Electronics
Confidential
-4-
Datasheet
OB_DOC_DS_2358LA1

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OB2358L 전자부품, 판매, 대치품
OB2358L
Current Mode PWM Power Switch Frequency Shuffling
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.
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 M, 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.
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.
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.
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.
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.
Oscillator Operation
The switching frequency of OB2358L is internally
fixed at 50KHZ. No external frequency setting
components are required for PCB design
simplification.
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.
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 sub-
harmonic oscillation and thus reduces the output
ripple voltage.
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
©On-Bright Electronics
Confidential
7
Datasheet
OB_DOC_DS_2358LA1

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관련 데이터시트

부품번호상세설명 및 기능제조사
OB2358

Current Mode PWM Power Switch

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OB2358

Built-in high voltage MOSFET current-mode PWM controller series

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