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OB2273AのメーカーはOn-Brightです、この部品の機能は「High Performance Current Mode PWM Controller」です。 |
部品番号 | OB2273A |
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部品説明 | High Performance Current Mode PWM Controller | ||
メーカ | On-Bright | ||
ロゴ | |||
このページの下部にプレビューとOB2273Aダウンロード(pdfファイル)リンクがあります。 Total 10 pages
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
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
RECOCM:MOpEtiNonDalEInDteOrnaPl ECRodAeTING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min/Max
12 to 25
-20 to 85
Unit
V
℃
BLOCK DIAGRAM
©On-Bright Electronics
Confidential
-3-
Datasheet
OB_DOC_DS_2273AA2
3Pages OB2273A
High Performance Current Mode PWM Controller
CHARACTERIZATION PLOTS
VDD = 18V, TA = 25℃ condition applies if not otherwise noted.
Istartup(uA) vs Temperature(℃)
5.0
4.5
4.0
3.5
Vth_otp(V) vs Temperature(℃)
1.02
1.01
1.00
0.99
3.0
-40
0 40 80 120
Temperature(℃)
0.98
-40
0 40 80
Temperature(℃)
120
UVLO(on)(V) vs Temperature(℃)
UVLO(off)(V) vs Temperature(℃)
9.6
9.4
9.2
9
8.8
-40
0 40 80 120
Temperature(℃ )
15.4
15.2
15
14.8
14.6
14.4
-40
0 40 80 120
Temperature(℃ )
Vth_OC(V)vs duty(%)
0.95
0.90
0.85
0.80
0.75
0
14 28 42 56 70
Duty(%)
Fosc(KHz) vs Temperature(℃)
64.0
63.8
63.5
63.3
63.0
-40
0 40 80 120
Temperature(℃)
©On-Bright Electronics
Confidential
6
Datasheet
OB_DOC_DS_2273AA2
6 Page | |||
ページ | 合計 : 10 ページ | ||
|
PDF ダウンロード | [ OB2273A データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
OB2273 | High Performance Current Mode PWM Controller | On-Bright |
OB2273A | High Performance Current Mode PWM Controller | On-Bright |