OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
GENERAL DESCRIPTION
OB5269 is a highly integrated current mode PWM
control IC with high voltage start up, optimized for
high performance, low standby power
consumption and cost effective offline flyback
converter applications.
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.
OB5269 is offered in SOP8 package.
FEATURES
High Voltage Startup
Power on Soft Start Reducing MOSFET Vds
Stress
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
o VDD Under Voltage Lockout with
Hysteresis (UVLO)
o Cycle-by-cycle over current protection
(OCP)
o Overload Protection (OLP) with auto-
recovery
o Over Temperature Protection (OTP) with
latch shut down
o VDD Over voltage Protection(OVP) with
latch shut down
o Adjustable OVP through external Zener
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
The OB5269 is offered in SOP8 package, shown
as below.
RT
FB
CS
GND
18
27
OB5269
36
45
HV
NC
VDD
GATE
Ordering Information
Part Number
OB5269CP
Description
SOP8, Pb-free
OB5269CPA
SOP8, Pb-free in Taping
Package Dissipation Rating
Package
RθJA(/W)
SOP8
150
Absolute Maximum Ratings
Parameter
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
Lead
Temperature
(Soldering, 10secs)
Value
30V
-0.3 to 500 V
VDD_Clamp+0.1V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-40 to 150
-55 to 160
260
Note: VDD_Clamp has a nominal value of 32V.
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.
OB5269 X
X
X
Current Mode PWM Controller with HV
Startup
Package
C:SOP8
Package Pb free
P:lead-free
Packing
Blank:Tube
A:Taping
©On-Bright Electronics
Confidential
-2-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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Marking Information
OB5269
High Voltage Green Mode PWM Controller
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
1
2
3
4
5
6
8
Pin Name
RT
FB
CS
GND
Gate
VDD
HV
I/O Description
Dual function pin. Either connected through a NTC resistor to ground for
I over temperature shutdown/latch control or connected through Zener to
VDD for adjustable over voltage protection
I
Feedback input pin. The PWM duty cycle is determined by voltage level
into this pin and the current-sense signal at CS pin
I Current sense input
P Ground
O Totem-pole gate driver output for power Mosfet
P Power Supply
P Connected to the line input or bulk capacitor via resistors for startup
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min/Max
12 to 23.5
-20 to 85
Unit
V
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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BLOCK DIAGRAM
VDD
6
OB5269
High Voltage Green Mode PWM Controller
RT 1
HV 8
HV
star
t
Vth_ovp
Vth_otp
Internal supply
LDO
UVLO
PORb
OVP
Clamp
RQ
S
Burst
mode
Latch
Soft
Driver
5 GATE
Logic
Control
Soft Start
CS Float
OSC
Extended
Burst mode
OCP
CPL Vth
Slope
compensation
LEB
3 CS
5V
PWM
Comparator
Debounce
OLP
R
2 FB
R
4
GND
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=15V, unless otherwise noted)
Symbol
IHV
Parameter
Supply current from HV pin
Test Conditions
VDD=2V, HV=100V
Min Typ.
2 2.8
leakage
HV pin leakage current after
startup
VDD=15V, HV=500V
Supply Voltage (VDD)
Istartup
VDD Start up Current
VDD=UVLO(OFF)-
1V, measure leakage
current into VDD
5
I_VDD_Operation Operation Current
VFB=3V
UVLO(ON)
VDD Under Voltage Lockout
Enter
1.8
8.3 9.3
UVLO(OFF)
VDD Under Voltage Lockout
Exit (Recovery)
14.3 15.3
Vpull-up
Pull-up PMOS active
12
Vdd_clamp
Ivdd=10mA
30 32
OVP(ON)
Over voltage
voltage
protection
FB=3V
Ramp up VDD until
gate clock is off
24
26
Vth_recovery
Auto release threshold
voltage
5
Vth_latch
Latch release threshold
4.2
Feedback Input Section(FB Pin)
VFB_Open
VFB Open Loop Voltage
Avcs
PWM input gain Δ VFB/ Δ
VCS
3.9 5
1.7
Maximum duty Max duty cycle @
cycle
VDD=14V,VFB=3V,VCS=0.3V
75 80
Vref_green
The threshold enter green
mode
2
Vref_burst_H
The threshold exit burst mode
1.2
Vref_burst_L
The threshold enter burst
mode
1.1
IFB_Short
FB pin short circuit current
Short FB pin to GND
and measure current
360
VTH_PL
Power Limiting FB Threshold
Voltage
3.7
TD_PL
Power limiting Debounce
Time
80 88
ZFB_IN
Input Impedance
17
Current Sense Input(CS Pin)
SST Soft start time
4
T_blanking
Leading edge blanking time
320
ZSENSE_IN
TD_OC
Input Impedance
Over Current Detection and
Control Delay
From Over Current
Occurs till the gate
driver output starts to
turn off
40
60
VTH_OC
Internal Current Limiting
Threshold Voltage with zero
duty cycle
0.72 0.75
Vocp_clamping CS voltage clamper
0.95
Oscillator
Max Unit
5 mA
10 uA
20 uA
2.5
10.3
mA
V
16.3
34
V
V
V
28 V
V
V
V
V/V
85 %
V
V
V
uA
V
96 mSec
Kohm
ms
ns
Kohm
nSec
0.78
V
V
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
FOSC
f_OSC
F_shuffling
f_Temp
Normal Oscillation Frequency
Frequency jittering
Shuffling frequency
Frequency
Temperature
Stability
f_VDD
Frequency Voltage Stability
F_Burst
Burst Mode Switch Frequency
Gate driver
VOL
Output low level @ VDD=15V,
Io=20mA
VOH
V_clamping
T_r
Output high level @
VDD=15V, Io=20mA
Output clamp voltage
Output rising time 1V ~ 10V
@ CL=1000pF
T_f
Output falling time 10V ~ 1V
@ CL=1000pF
Over temperature protection
IRT Output current of RT pin
Vth_OTP
Threshold voltage for OTP
Td_OTP
OTP debounce time
VRT_FL
Voltage at floating RT pin
Vth_OVP
External OVP threshold
voltage
Td_OVP
External OVP debounce time
VDD=15V, FB=3V,
60 65 70 KHZ
+/-4 %
32 Hz
1%
1%
22 KHZ
1V
8
13
70
V
V
nS
30 nS
95 100 105 uA
0.95 1 1.05 V
8 Cycle
2.6 V
3.6 V
8 Cycle
©On-Bright Electronics
Confidential
-6-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
CHARACTERIZATION PLOTS
VDD = 15V, TA = 25condition applies if not otherwise noted.
I_startup(uA) vs Temperature()
Vth_otp(V) vs Temperature()
1.01
16
14 1
12
10
8
-40
0 40 80
Tem perature()
120
0.99
0.98
-40
0 40 80
Tem perature()
120
UVLO_on(V) vs Temperature()
UVLO_off(V) vs Temperature()
9.6
9.4
9.2
9
-40
0 40 80
Tem perature()
120
15.8
15.6
15.4
15.2
15
-40
0 40 80
Tem perature()
120
1
0.95
0.9
0.85
0.8
0.75
0.7
0
Vth_OC(V) vs Duty(%)
20 40
Duty(%)
60
80
Fosc(KHz) vs Temperature()
65.5
65
64.5
64
-40
0 40 80
Tem perature()
120
©On-Bright Electronics
Confidential
-7-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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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.
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.
In general application, a 51K Ω resistor is
recommended to be placed in the high voltage
path to limit the current.
VDD
UVLO_off
UVLO_on
HV Current
2.8mA
t
VDD
Current
Operation Current
t
Startup Current
t
Fig1 Startup current timing
Operating Current
The typical operating current of OB5269 is 1.8mA.
Good efficiency is achieved with this low operating
current together with the ‘Extended burst mode’
control features.
Soft Start
OB5269 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 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 frequency
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.
Green-Mode Operation
OB5269 provides green-mode control to reduce
the switching frequency in light-load and no-load
conditions. VFB, which is derived from the voltage
feedback loop, is taken 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 around 22KHz.
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 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.
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.
The switching frequency control also eliminates
the audio noise at any loading conditions.
Oscillator Operation
The switching frequency is internally fixed at
65KHZ. No external frequency setting
components are required for PCB design
simplification.
©On-Bright Electronics
Confidential
-8-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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OB5269
High Voltage Green Mode PWM Controller
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.
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.
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.
Protection Controls
Good power supply system reliability is achieved
with auto-recovery protection features including
Cycle-by-Cycle current limiting (OCP), Over Load
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 to achieve constant
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 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
condition or Over Voltage condition is detected
until VDD drops below Vth_latch , and device
enters power on restart-up sequence thereafter.
©On-Bright Electronics
Confidential
-9-
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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PACKAGE MECHANICAL DATA
OB5269
High Voltage Green Mode PWM Controller
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
Dimensions In Millimeters
Min
1.350
Max
1.750
0.050
0.250
1.250
1.650
0.310
0.510
0.170
0.250
4.700
5.150
3.800
4.000
5.800
6.200
1.270 (BSC)
0.400
1.270
0º 8º
Dimensions In Inches
Min
0.053
Max
0.069
0.002
0.010
0.049
0.065
0.012
0.020
0.006
0.010
0.185
0.203
0.150
0.157
0.228
0.244
0.05 (BSC)
0.016
0.050
0º 8º
©On-Bright Electronics
Confidential
- 10 -
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/


OB5269 (On-Bright)
High Voltage Green Mode PWM Controller

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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 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
- 11 -
Preliminary Datasheet
OB_DOC_DS_526902
Datasheet pdf - http://www.DataSheet4U.net/




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