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データシート OB2273 PDF ダウンロード ( 特性, スペック, ピン接続図 )

部品番号 OB2273
部品説明 High Performance Current Mode PWM Controller
メーカ On-Bright
ロゴ On-Bright ロゴ 
プレビュー
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OB2273 Datasheet, OB2273 PDF,ピン配置, 機能
OB2273
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2273 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 OB2273.
OB2273 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 20KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2273 is offered in SOT23-6 and DIP-8 package.
FEATURES
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
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 Adapter
Set-Top Box Power Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/

1 Page



OB2273 pdf, ピン配列
Marking Information
73YWW
S
Y:Year Code
WW:Week Code(01-52)
S:Internal Code(Optional)
OB2273
High Performance Current Mode PWM Controller
TERMINAL ASSIGNMENTS
Pin Name
GND
FB
RT
CS
VDD
Gate
I/O Description
P Ground
I
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin 4.
Dual function pin. Either connected through a NTC resistor to ground for over
I temperature shutdown/latch control or connected through Zener to VDD for
adjustable over voltage protection
I Current sense input
P Power Supply
O Totem-pole gate driver output for power Mosfet
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min/Max
12 to 25
-40 to 85
Unit
V
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/


3Pages


OB2273 電子部品, 半導体
OB2273
High Performance Current Mode PWM Controller
f_Temp
f_VDD
F_Burst
Frequency
Temperature
Stability
Frequency Voltage Stability
Burst Mode Switch Frequency
Gate driver
VOL
VOH
Output low level @ VDD=18V,
Io=5mA
Output high level @
VDD=18V, Io=20mA
V_clamping
Output clamp voltage
T_r
Output rising time 1V ~ 12V
@ CL=1000pF
T_f
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%
1%
22 KHZ
1V
6
12
175
V
V
nS
85 nS
95 100
0.95 1
32
2.3
4
105 uA
1.05 V
Cycle
V
V
©On-Bright Electronics
Confidential
-6-
Preliminary Datasheet
OB_DOC_DS_227305
Free Datasheet http://www.datasheet4u.com/

6 Page





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