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RS2254PG Datasheet(PDF) 1 Page - Orister Corporation

Part # RS2254PG
Description  Second?륲ide Regulation Current Mode PWM Power Switcher
Download  9 Pages
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Manufacturer  ORISTER [Orister Corporation]
Direct Link  http://www.orister.com
Logo ORISTER - Orister Corporation

RS2254PG Datasheet(HTML) 1 Page - Orister Corporation

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DS‐RS2254‐11    May,  2010 
www.Orister.com
RS2254 
Second‐Side Regulation Current Mode PWM Power Switcher 
 
General Description 
RS2254 combines a dedicated current mode PWM controller with a high voltage power MOSFET. It is optimized for high performance, 
low standby power, and cost effective off‐line flyback converter applications in sub 15W range. 
 
RS2254 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). Excellent EMI performance is achieved with Orister 
proprietary frequency Jiggling technique together with soft switching control at the totem pole gate drive output. The tone energy at 
below 20KHz is minimized in the design and audio noise is eliminated during operation. RS2254 is offered in DIP‐8 package.
 
Features 
Applications 
Power on Soft Start Reducing MOSFET VDS Stress 
Frequency Jiggling to reduce EMI 
Burst Mode Control For Improved Efficiency and Minimum 
Standby power Design 
Audio Noise Free Operation 
Fixed 50KHz Switching Frequency 
Internal Synchronized Slope Compensation 
Low VDD Startup Current and Low Operating Current 
Leading Edge Blanking on Current Sense Input 
Good Protection Coverage With Auto Self‐Recovery 
VDD Over Voltage Clamp and Under Voltage Lockout 
with Hysteresis (UVLO) 
Line Input Compensated Cycle‐by‐Cycle Over‐current 
Threshold Setting For Constant Output Power Limiting 
Over Universal Input Voltage Range 
Overload Protection (OLP) 
Over Voltage Protection (OVP) 
RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen 
Free with Commercial Standard) 
Battery Charger 
Digital Cameras and camcorder Adaptor 
PDA power supplies 
VCR, SVR, STB, DVD & DVCD Player SMPS 
Set‐Top Box (STB) Power 
Auxiliary Power Supply for PC and Server 
Open‐frame SMPS 
Application Circuits 
VOUT
GND
C2
C1
-+
D1
2
4
R1
L1
C3
D2
Naux
U2
1
2
3
4
C7
R3
R2
C4
D5
RS431
T1
D3
C5
R5
R7
R8
R9
R10
D4
R6
C6
C8
U1
RS2254
VDD
FB
SENSE DRAIN
DRAIN
VDDG
GND
GND
R4
Np
Ns
AC IN


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