GENERAL DESCRIPTION
OB5269B 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 OB5269B,
which features with short startup time and low
standby current.
OB5269B offers complete protection coverage
with auto-recovery including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP),
brownout protection and VDD under voltage
lockout (UVLO). It also provides the protections
with latched shut down including over temperature
protection (OTP), and VDD over voltage protection. 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. OB5269B 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 Brownout Protection with auto-recovery o Over Temperature Protection (OTP) with latch shut down o VDD Over voltage Protection(OVP) with latch shut down ■ Intelligent AC off Detect with X-cap discharge
function (On-Bright patent) APPLICATIONS Offline AC/DC flyback converter for ■ Battery Charger ■ Power Adaptor
■ Open-frame SMPS
TYPICAL APPLICATION
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GENERAL INFORMATION
Pin Configuration
The OB5269B is offered in SOP8 package, shown as below.
pcb技术BO FB CS GND
HV NC VDD GATE
Ordering Information Part Number Description OB5269BCP SOP8, Pb-free OB5269BCPA SOP8, Pb-free in Taping
Package Dissipation Rating Package R JA(℃/W)
SOP8 150
Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 30V High-Voltage Pin, HV -0.3 to 500 V VDD Zener Clamp
Voltage Note
VDD_Clamp+0.1V
VDD DC Clamp Current 10 mA FB Input Voltage -0.3 to 7V CS Input Voltage -0.3 to 7V BO Input Voltage -0.3 to 7V Min/Max Operating
Junction Temperature TJ -40 to 150 ℃
Min/Max Storage
Temperature Tstg
-55 to 160 ℃
Lead Temperature
(Soldering, 10secs)
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.
OB5269B X X X
High Voltage Green Mode PWM Controller with Brownout
Package C:SOP8
Package Pb free P:lead-free
Packing Blank:Tube A:Taping
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Marking Information
YWWZZZ OB5269CP B
S
Y:Year Code
WW:Week Code(01-52)ZZZ:Lot Code C:SOP8 Package P:Pb-free Package B:Version
S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin
Num
Pin Name I/O Description
1
BO
I
Connected resistors for brownout protection
2 FB I
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at CS pin 3 CS
I Current sense input 4 GND P Ground 5 Gate
O Totem-pole gate driver output for power Mosfet 6 VDD P Power Supply 8 HV
P Connected to the line input or bulk capacitor via resistors for startup
RECOMMENDED OPERATING CONDITION
Symbol Parameter
Min/Max Unit VDD VDD Supply Voltage
12 to 23.5 V T A
Operating Ambient Temperature
-20 to 85
℃
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BLOCK DIAGRAM
CS
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ELECTRICAL CHARACTERISTICS
(T A = 25℃, VDD=15V, unless otherwise noted) Symbol Parameter Test Conditions Min Typ. Max Un
it IHV Supply current from HV pin
VDD=2V, HV=100V 1 5 mA leakage
HV pin leakage current after
startup
VDD=18V, HV=500V
uA
Supply Voltage (VDD) Istartup
VDD Start up Current
VDD=UVLO(OFF)-1V, measure leakage
current into VDD
5 20 uA I_VDD_Operation Operation Current
V FB =3V 1.8 2.5mA
UVLO(ON)
VDD Under Voltage Lockout
Enter
8.3 9.3 10.3V
UVLO(OFF)
VDD Under Voltage Lockout
Exit (Recovery)
14.3 15.3 16.3V
Vpull-up Pull-up PMOS active 12 V Vdd_clamp
Ivdd =10mA 30 32 34 V OVP(ON) Over voltage protection
voltage
FB=3V
Ramp up VDD until gate clock is off 24 26 28 V
Vth_recovery Auto release threshold
voltage
5 V
Vth_latch Latch release threshold 4.2 V Feedback Input Section(FB Pin)
V FB_Open V FB Open Loop Voltage 3.9 5 V
Avcs PWM input gain ΔVFB/Δ
VCS
1.7 V/V
Maximum duty cycle Max duty cycle @
VDD=14V,VFB=3V,VCS=0.3V
75 80 85 %
Vref_green The threshold enter green
mode
1.8 V
Vref_burst_H The threshold exit burst mode 1.2 V
Vref_burst_L The threshold enter burst
mode
1.1 V
I FB _Short FB pin short circuit current Short FB pin to GND
and measure current
200 uA
V TH _PL Power Limiting FB Threshold
Voltage
T D _PL Power limiting Debounce
Time
80 88 96 mSec
Z FB _IN Input Impedance 25 Kohm Current Sense Input(CS Pin) SST Soft start time 4 ms T_blanking Leading edge blanking time 320 ns Z SENSE _IN Input Impedance 40 Kohm
T D _OC Over Current Detection and Control Delay From Over Current
Occurs till the gate
driver output starts to
turn off
60 nSec
V TH _OC Internal Current Limiting
Threshold Voltage with zero duty cycle
0.72 0.75 0.78V
Vocp_clamping CS voltage clamper 0.95 V Oscillator F OSC Normal Oscillation Frequency VDD=15V, FB=3V, 60 65 70 KHZ
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