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OB5269B Schematic ( PDF Datasheet ) - On-Bright Electronics

Teilenummer OB5269B
Beschreibung High Voltage Green Mode PWM Controller
Hersteller On-Bright Electronics
Logo On-Bright Electronics Logo 




Gesamt 10 Seiten
OB5269B Datasheet, Funktion
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






OB5269B Datasheet, Funktion
OB5269B
High Voltage Green Mode PWM Controller with Brownout
f_OSC
Frequency jittering
F_shuffling
Shuffling frequency
f_Temp
Frequency
Stability
Temperature
f_VDD
Frequency Voltage Stability
F_Burst
Burst Mode Switch Frequency
Gate driver
VOL
Output low level @ VDD=15V,
Io=20mA
VOH
Output high level @
VDD=15V, Io=20mA
V_clamping
Output clamp voltage
T_r
Output rising time 1V ~ 10V
@ CL=1000pF
T_f
Output falling time 10V ~ 1V
@ CL=1000pF
Brownout protection
Vth_bo_L
Threshold
Brownout
voltage
for
Vth_bo_H
Threshold voltage
Brownout release
for
Td_brownout
Brownout debounce time
On Chip OTP
OTP Level
+/-8 %
32 Hz
1%
1%
22 KHZ
1V
8
15
70
V
V
nS
30 nS
0.77 0.82 0.87 V
0.90 0.95 1.00
60 80
V
mS
150
©On-Bright Electronics
Confidential
-6-
Preliminary Datasheet
OB_DOC_DS_5269B03

6 Page







SeitenGesamt 10 Seiten
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