OB5269CP [ETC]
High Voltage Green Mode PWM Controller;
| 型号： | OB5269CP |
| 厂家： | 
ETC |
| 描述： | High Voltage Green Mode PWM Controller |
| 文件： | 总11页 (文件大小：377K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OB5269
High Voltage Green Mode PWM Controller
GENERAL DESCRIPTION
FEATURES
OB5269 is a highly integrated current mode PWM
control IC with high voltage start up, optimized for
■
■
High Voltage Startup
Power on Soft Start Reducing MOSFET Vds
Stress
high
performance,
low
standby
power
consumption and cost effective offline flyback
converter applications.
■
■
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Audio Noise Free Operation
Fixed 65KHZ Switching Frequency
Comprehensive Protection Coverage
PWM switching frequency at normal operation is
internally fixed and is trimmed to a tight range. At
no load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Very low standby power consumption and very
high conversion efficiency is thus achieved.
High voltage startup is implemented in OB5269,
which features with short startup time and low
standby current.
OB5269 offers complete protection coverage with
auto-recovery including Cycle-by-Cycle current
limiting (OCP), over load protection (OLP), and
VDD under voltage lockout (UVLO). It also
provides the protections with latched shut down
including over temperature protection (OTP), and
over voltage (fixed or adjustable) protection (OVP).
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique.
The tone energy at below 22KHZ is minimized to
avoid audio noise during operation.
■
■
■
o
o
o
o
o
o
VDD Under Voltage Lockout with
Hysteresis (UVLO)
Cycle-by-cycle over current protection
(OCP)
Overload Protection (OLP) with auto-
recovery
Over Temperature Protection (OTP) with
latch shwn
VDD Ovvoltage Protection(OVP) with
latch shut down
Adjustable OVP through external Zener
APLICATIONS
fline AC/DC flyback converter for
■
■
Battery Charger
Power Adaptor
Open-frame SMPS
OB5269 is offered in SOP8 package.
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 1 -
OB5269
High Voltage Green Mode PWM Controller
GENERAL INFORMATION
Absolute Maximum Ratings
Parameter
Value
Pin Configuration
VDD DC Supply Voltage
High-Voltage Pin, HV
VDD Zener Clamp
VoltageNote
VDD DC Clamp Current
FB Input Voltage
CS Input Voltage
RT Input Voltage
Min/Max Operating
Junction Temperature TJ
Min/Max Storage
Temperature Tstg
30V
-0.3 to 500 V
The OB5269 is offered in SOP8 package, shown
as below.
VDD_Clamp+0.1V
RT
FB
1
2
8
7
6
5
HV
NC
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
OB5269
VDD
CS
3
4
-40 to 150 ℃
5 to 160 ℃
260 ℃
GATE
GND
Lead
Temperature
Ordering Information
Part Number
(Soldering, 10secs)
Note: VDD_Clamp haa nominal value of 32V.
Description
OB5269CP
SOP8, Pb-free
Stresses beyond listed under “absolute maximum
ratings” may cause anent 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 ect device reliability.
OB5269CPA
SOP8, Pb-free in Taping
Package Dissipation Rating
Package
SOP8
RθJA(℃/W)
150
OB5269
X
X
X
Package
Package Pb free
Current Mode PWM Controller with HV
Startup
Packing
P:lead-free
Blank:Tube
A:Taping
C:SOP8
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 2 -
OB5269
High Voltage Green Mode PWM Controller
Marking Information
YWWZZZ
OB5269CP
S
Y:Year Code
WW:Week Code(01-52)
ZZZ:Lot Code
C:SOP8 Package
P:Pb-free Package
S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin
Num
Pin Name
I/O Description
Dual function pin. Either connected through a NTC resistor to ground for
over temperature shutdowatch control or connected through Zener to
VDD for adjustable over vltage protection
1
RT
I
Feedback input pin. PWM duty cycle is determined by voltage level
into this pin and the cnt-sense signal at CS pin
Current sense input
2
FB
I
3
4
5
6
8
CS
I
GND
Gate
VDD
HV
P
O
P
P
Ground
Totem-pole gate driver output for power Mosfet
Power ply
Conneto the line input or bulk capacitor via resistors for startup
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Oerating Ambient Temperature
Min/Max
12 to 23.5
-20 to 85
Unit
V
℃
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 3 -
OB5269
High Voltage Green Mode PWM Controller
BLOCK DIAGRAM
VDD
6
Soft
Driver
5
GATE
RT
HV
1
Vth_otp
Latch
Vth_ovp
Logic
Control
8
CS Floa
R
S
Q
Internal supply
LDO
Soft Start
OCP
HV
star
t
Extended
Burst mode
OSC
UVLO
PORb
Slope
3
CS
LEB
compensation
CPL
Vth
OVP
5V
Clamp
PWM
Comparator
Burst
mode
R
Deounce
OLP
FB
2
R
4
GND
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 4 -
OB5269
High Voltage Green Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=15V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ.
Max Unit
IHV
Supply current from HV pin
HV pin leakage current after
startup
VDD=2V, HV=100V
2
2.8
5
mA
leakage
VDD=15V, HV=500V
10
uA
Supply Voltage (VDD)
VDD=UVLO(OFF)-
1V, measure leakage
current into VDD
VFB=3V
Istartup
VDD Start up Current
5
20
uA
I_VDD_Operation Operation Current
1.8
9.3
2.5
mA
V
VDD Under Voltage Lockout
Enter
UVLO(ON)
8.3
10.3
VDD Under Voltage Lockout
Exit (Recovery)
Pull-up PMOS active
UVLO(OFF)
14.3 .3 16.3
12
V
Vpull-up
Vdd_clamp
V
V
Ivdd=10mA
FB=3V
30
32
34
Over
voltage
protection
OVP(ON)
Ramp up VDD 24
gate clock is off
26
28
V
voltage
Auto release threshold
voltage
Latch release threshold
Vth_recovery
Vth_latch
5
V
V
4.2
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop Voltage
PWM input gain ΔVFB/ Δ
VCS
3.9
75
5
V
Avcs
1.7
V/V
Maximum
cycle
duty Max
duty
cycle
@
80
85
%
VDD=14V,VFB=3V,VCS=0.3V
The threshold enter green
mode
The threshold exit burst mode
The threshold enter burst
mode
Vref_green
2
V
V
V
Vref_burst_H
Vref_burst_L
1.2
1.1
Short FB pin to GND
and measure current
IFB_Short
VTH_PL
FB pin short circuit current
360
3.7
uA
V
Power Limiting FB Threshold
oltage
wer limiting Debounce
Time
Input Impedance
TD_PL
ZFB_IN
80
88
17
96
mSec
Kohm
Current Se Input(CS Pin)
SST
T_blanking
ZSENSE_IN
Soft start time
Leading edge blanking time
Input Impedance
4
320
40
ms
ns
Kohm
From Over Current
Over Current Detection and Occurs till the gate
TD_OC
60
nSec
Control Delay
driver output starts to
turn off
Internal Current
Limiting
VTH_OC
Threshold Voltage with zero
duty cycle
CS voltage clamper
0.72 0.75 0.78
0.95
V
V
Vocp_clamping
Oscillator
©On-Bright Electronics
Confidential
- 5 -
Preliminary Datasheet
OB_DOC_DS_526902
OB5269
High Voltage Green Mode PWM Controller
FOSC
△f_OSC
F_shuffling
Normal Oscillation Frequency VDD=15V, FB=3V,
Frequency jittering
Shuffling frequency
60
65
+/-4
32
70
KHZ
%
Hz
Frequency
Stability
Temperature
△f_Temp
1
%
△f_VDD
F_Burst
Frequency Voltage Stability
Burst Mode Switch Frequency
1
22
%
KHZ
Gate driver
Output low level @ VDD=15V,
Io=20mA
VOL
1
V
Output high level @
VDD=15V, Io=20mA
Output clamp voltage
Output rising time 1V ~ 10V
@ CL=1000pF
VOH
8
V
V
V_clamping
T_r
13
70
nS
Output falling time 10V ~ 1V
@ CL=1000pF
T_f
0
nS
Over temperature protection
IRT
Output current of RT pin
Threshold voltage for OTP
OTP debounce time
95
0.95
100
1
8
105
1.05
uA
V
Cycle
V
Vth_OTP
Td_OTP
VRT_FL
Voltage at floating RT pin
2.6
External
voltage
External OVP debounce time
OVP
threshold
Vth_OVP
Td_OVP
3.6
8
V
Cycle
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 6 -
OB5269
High Voltage Green Mode PWM Controller
CHARACTERIZATION PLOTS
VDD = 15V, TA = 25℃condition applies if not otherwise noted.
Vth_otp(V) vs Temperature(
)
℃
I_startup(uA) vs Temperature(
)
℃
1.01
1
16
14
12
10
8
0.99
0.98
-40
0
40
80
120
-40
0
40
80
120
Temperature(
)
℃
Temperature(
)
℃
UVLO_on(V) vs Temperature(
)
UVLO_o) vs Temperature(
)
℃
℃
9.6
9.4
9.2
9
15.8
15.6
15.4
15.2
15
-40
0
40
80
120
-40
0
40
80
120
Temperature(
)
℃
Temperature(
)
℃
Vth_OC(V) vs Duty(%)
Fosc(KHz) vs Temperature(
)
℃
1
65.5
65
0.95
0.9
0.85
0.8
64.5
64
0.7
0.7
-40
0
40
80
120
0
20
40
60
80
Temperature(
)
℃
Duty(%)
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 7 -
OB5269
High Voltage Green Mode PWM Controller
OPERATION DESCRIPTION
OB5269 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power consumption and cost effective
offline flyback converter applications. The
‘Extended burst mode’ control greatly reduces the
standby power consumption and helps the design
easily to meet the international power
conservation requirements.
power on sequence. As soon as VDD reaches
UVLO(OFF), the CS peak voltage is gradually
increased from 0V to the maximum level. Every
restart up begins with a soft start.
•
Frequency shuffling for EMI improvement
The frequency shuffling (switching freuency
modulation) is implemented in OB5269. 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 High Voltage Startup and Under
Voltage Lockout (UVLO)
OB5269 integrates HV startup circuit, and
provides about 2.8mA current to charge VDD pin
during power on state from HV pin. When VDD
cap voltage is higher than UVLO(OFF), the
charge current is switched off. At this moment,
the VDD capacitor provides current to OB5269
until the auxiliary winding of the main transformer
starts to provide the operation current.
•
Green-Mode Operation
OB5269 provides green-mode control to reduce
the switching frequency in light-load and no-load
conditions. VFB, h is derived from the voltage
feedback loop, iaken as the reference. Once
VFB is lower than the threshold voltage
(Vref_green), switching frequency is continuously
decreased to the minimum green-mode frequency
of und 22KHz.
In general application, a 51K Ω resistor is
recommended to be placed in the high voltage
path to limit the current.
VDD
Extended Burst Mode Operation
light load or zero load condition, most of the
power dissipation in a switching mode power
supply is from switching loss in the MOSFET, the
core loss of the transformer and the loss in 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.
UVLO_off
UVLO_on
HV Current
2.8mA
The switching frequency is internally adjusted at
no load or light load condition. The switching
frequency is reduced 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 voltage (Vref_burst_L) and device
enters Burst Mode control. The gate driver output
switches only when FB voltage is higher than the
threshold voltage (Vref_burst_H) 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.
t
VDD
Current
Operation Current
Starup Current
t
g1 Startup current timing
Operating Current
•
he typical operating current of OB5269 is 1.8mA.
ood efficiency is achieved with this low operating
urrent together with the ‘Extended burst mode’
control features.
The switching frequency control also eliminates
the audio noise at any loading conditions.
• Oscillator Operation
•
Soft Start
The switching frequency is internally fixed at
OB5269 features an internal 4ms soft start to
soften the electrical stress occurring in the power
supply during startup. It is activated during the
65KHZ.
No
external
frequency
setting
components are required for PCB design
simplification.
©On-Bright Electronics
Confidential
- 8 -
Preliminary Datasheet
OB_DOC_DS_526902
OB5269
High Voltage Green Mode PWM Controller
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
EMI system design is achieved with this dedicated
control scheme.
•
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in
OB5269 current mode PWM control. The
switching current is detected by a sense resistor
connected to the CS pin. An internal leading edge
blanking circuit chops off the sensed voltage
spikes due to snubber diode reverse recovery and
surge gate current of power MOSFET at initial
internal power MOSFET on state. 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.
•
Protection Controls
Good power supply system reliability is achieved
with auto-recovery protection features including
Cycle-by-Cycle current limiting (OCP), OveLoad
Protection (OLP), and Under Voltage Lockout on
VDD (UVLO), and latched shutdown features
including over temperature protection (OTP) and
VDD over voltage protection (OVP).
With On-Bright proprietary technology, the OCP is
line voltage compensated achieve constant
output power limit over the ersal input voltage
range.
At overload condition when FB input voltage
exceeds power lithreshold value for more than
TD_PL, control t shuts down the converter. It
restarts when VDD voltage drops below
Vth_recovery. For protection with latched shut
down mode, control circuit shutdowns (latch) the
power MOSFET when an Over Temperature
coition or Over Voltage condition is detected
until VDD drops below Vth_latch , and device
•
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 eliminates the sub-
harmonic oscillation and thus reduces the output
ripple voltage.
•
Driver
The power MOSFET is driven by a dedicated gate
driver for power switching control. Too weak gate
driver results in higher conduction and switch loss
of MOSFET while too strong gate driver results
the compromise of EMI.
.
ters power on restart-up sequence thereafter
©On-Bright Electronics
Confidential
- 9 -
Preliminary Datasheet
OB_DOC_DS_526902
OB5269
High Voltage Green Mode PWM Controller
PACKAGE MECHANICAL DATA
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
A2
b
c
D
E
1.350
0.050
1.250
0.310
0.170
4.700
3.800
5.800
1.750
0.250
1.650
0.510
0.250
5.150
4.000
6.200
0.053
0.002
0.049
0.012
0.006
0.185
0.150
0.228
0.069
0.010
0.065
0.020
0.010
0.203
0.157
0.244
E1
e
1.270 (BSC)
0.05 (BSC)
L
θ
0.400
0º
1.270
8º
0.016
0º
0.050
8º
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 10 -
OB5269
High Voltage Green Mode PWM Controller
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 application assistance or customer product design.
Customers are responsible for their products and applications using On-Bright’s cnents, 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 conents 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 designd for use in military applications. On-Bright
Electronics Corp. will not be held liable for any damagor claims resulting from the use of its products in
military applications.
©On-Bright Electronics
Confidential
Preliminary Datasheet
OB_DOC_DS_526902
- 11 -
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