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OB2262のメーカーはOn-Brightです、この部品の機能は「Current Mode PWM Controller」です。 |
部品番号 | OB2262 |
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部品説明 | 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OB2262ダウンロード(pdfファイル)リンクがあります。 Total 13 pages
OB2262
GENERAL DESCRIPTION
OB2262 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications in sub 30W range.
PWM switching frequency at normal operation is
externally programmable and 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.
www.DataSheeVt4DUD.comlow startup current and low operating current
contribute to a reliable power on startup design with
OB2262. A large value resistor could thus be used in
the startup circuit to minimize the standby power.
The internal slope compensation improves system
large signal stability and reduces the possible sub-
harmonic oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense(CS) input
removes the signal glitch due to snubber circuit diode
reverse recovery and thus greatly reduces the external
component count and system cost in the design.
OB2262 offers complete protection coverage with
automatic self-recovery feature including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), VDD over voltage clamp and under voltage
lockout (UVLO). The Gate-drive output is clamped
to maximum 18V to protect the power MOSFET.
Excellent EMI performance is achieved soft
switching control at the totem pole gate drive output.
TYPICAL APPLICATION
Current Mode PWM Controller
The tone energy at below 20KHZ is minimized in the
design and audio noise is eliminated during operation.
OB2262 is offered in SOT23-6, SOP-8 and DIP-8
packages.
FEATURES
■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
■ Audio Noise Free Operation
■ External Programmable PWM Switching
Frequency
■ Internal Synchronized Slope Compensation
■ Low VDD Startup Current and Low Operating
Current (1.4mA)
■ Leading Edge Blanking on Current Sense Input
■ Good Protection Coverage With Auto Self-
Recovery
o VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
o Gate Output Maximum Voltage Clamp (18V)
o On-Bright Proprietary Line Input Compensated
Cycle-by-Cycle Over-current Threshold Setting
For Constant Output Power Limiting Over
Universal Input Voltage Range.
o Overload Protection (OLP).
APPLICATIONS
Offline AC/DC flyback converter for
■ Battery Charger
■ Power Adaptor
■ Set-Top Box Power Supplies
■ Open-frame SMPS
AC IN
EMI
F i l te r
4
2
+
+
V DD
GATE
OB2262
RI SENSE
FB GND
+ DC OUT
OB431
©On-Bright Electronics
Confidential to Micro Bridge
- 1 - OB_DOC_DS_62B5
1 Page Marking Information
OB2262
Current Mode PWM Controller
www.DataSheet4U.com
TERMINAL ASSIGNMENTS
Pin Name
GND
FB
RI
SENSE
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 6.
I Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets
the PWM frequency.
I Current sense input pin. Connected to MOSFET current sensing resistor node.
P Chip DC power supply pin.
O Totem-pole gate drive output for the power MOSFET.
RECOMMENDED OPERATING CONDITION
Symbol
VDD
RI
TA
Parameter
VDD Supply Voltage
RI Resistor Value
Operating Ambient Temperature
Min
Max
10 to 30
100
-20 to 85
Unit
V
Kohm
oC
©On-Bright Electronics
Confidential to Micro Bridge
- 3 - OB_DOC_DS_62B5
3Pages OB2262
Current Mode PWM Controller
Gate Drive Output
VOL
Output Low Level
VOH
Output High Level
V_Clamp
Output Clamp Voltage
Level
T_r Output Rising Time
T_f Output Falling Time
VDD = 16V, Io = -20 mA
VDD = 16V, Io = 20 mA 10
VDD = 16V, CL = 1nf
VDD = 16V, CL = 1nf
0.8
18
220
70
V
V
V
nSec
nSec
www.DataSheet4U.com
©On-Bright Electronics
Confidential to Micro Bridge
- 6 - OB_DOC_DS_62B5
6 Page | |||
ページ | 合計 : 13 ページ | ||
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PDF ダウンロード | [ OB2262 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 |
OB2262 | Current Mode PWM Controller | On-Bright |
OB2262 | 15W Adapter Module Design | On-Bright |
OB2263 | Current Mode PWM Controller | On-Bright |
OB2268 | (OB2268 / OB2269) Current Mode PWM Controller | Liteon |