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PDF OB2273A Datasheet ( Hoja de datos )

Número de pieza OB2273A
Descripción High Performance Current Mode PWM Controller
Fabricantes On-Bright 
Logotipo On-Bright Logotipo

Total 10 Páginas
		
OB2273A Hoja de datos, Descripción, Manual
OB2273A
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2273A is a highly integrated current mode
PWM control IC optimized for high performance,
low standby power and cost effective offline
flyback converter applications.
PWM switching frequency at normal operation is
internally fixed and is trimmed to tight range. At no
load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved.
VDD low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2273A.
OB2273A offers complete protection coverage
with auto-recovery including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP),
VDD under voltage lockout (UVLO), 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 20KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2273A is offered in SOT23-6 package.
FEATURES
Level 5 compliance with <100mW standby
power at universal AC input.
Power on Soft Start Reducing MOSFET Vds
Stress
Frequency shuffling for EMI
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
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 threshold
setting for constant output power limiting
over universal input voltage range
o Overload Protection (OLP) with auto-
recovery
o Over Temperature Protection (OTP) with
auto-recovery
o VDD Over voltage Protection(OVP) with
auto-recovery
o Adjustable OVP through external Zener
APPLICATIONS
Offline AC/DC flyback converter for
Battery Charger
Power Adaptor
Set-Top Box Power Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2273AA2

1 page

OB2273A pdf
OB2273A
High Performance Current Mode PWM Controller
f_VDD
F_Burst
Frequency Voltage Stability
Burst Mode Switch Frequency
Gate driver
VOL
VOH
V_clamping
T_r
T_f
Ouput low level @ VDD=14V,
Io=5mA
Ouput high level @ VDD=14V,
Io=20mA
Output clamp voltage
Output rising time 1V ~ 12V @
CL=1000pF
Output falling time 12V ~ 1V
@ CL=1000pF
Over temperature protection
IRT Output current of RT pin
VOTP
Threshold voltage for OTP
Td_OTP
OTP debounce time
VRT_FL
Float voltage at RT pin
Vth_OVP
External OVP threshold
voltage
1%
22 KHZ
1V
6
12
175
V
V
nS
85 nS
95
0.95
100
1
6
2.3
4
105 uA
1.05 V
Cycle
V
V
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2273AA2

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