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PDF OB5269B Data sheet ( Hoja de datos )
| Número de pieza | OB5269B | |
| Descripción | High Voltage Green Mode PWM Controller | |
| Fabricantes | On-Bright Electronics | |
| Logotipo |  |
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OB5269B
High Voltage Green Mode PWM Controller with Brownout
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
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_5269B03
1 page  
OB5269B
High Voltage Green Mode PWM Controller with Brownout
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.
1
leakage
HV pin leakage current after
startup
VDD=18V, 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
1.8
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
200
VTH_PL
Power Limiting FB Threshold
Voltage
3.7
TD_PL
Power limiting Debounce
Time
80 88
ZFB_IN
Input Impedance
25
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
FOSC
Normal Oscillation Frequency VDD=15V, FB=3V,
60 65
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
70 KHZ
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_5269B03
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet OB5269B.PDF ] | |
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