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RS2253 Datasheet, PDF (1/9 Pages) Orister Corporation – Second‐Side Regulation Current Mode PWM Power Switcher | |||
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RS2253
SecondâSide Regulation Current Mode PWM Power Switcher
Page No. : 1/9
General Description
RS2253 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 offâline flyback converter applications in sub 10W range.
RS2253 offers complete protection coverage with automatic selfârecovery feature including CycleâbyâCycle 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. RS2253 is offered in SOPâ8 package.
Features
â Power on Soft Start Reducing MOSFET VDS Stress
â Frequency Jiggling to reduce EMI
â Burst Mode Control For Improved Efficiency and Minimum
Standby power Design
â Audio Noise Free Operation
â Fixed 50KHz Switching Frequency
â Internal Synchronized Slope Compensation
â Low VDD Startup Current and Low Operating Current
â Leading Edge Blanking on Current Sense Input
â Good Protection Coverage With Auto SelfâRecovery
â VDD Over Voltage Clamp and Under Voltage Lockout
with Hysteresis (UVLO)
â Line Input Compensated CycleâbyâCycle Overâcurrent
Threshold Setting For Constant Output Power Limiting
Over Universal Input Voltage Range
â Overload Protection (OLP)
â Over Voltage Protection (OVP)
â RoHS Compliant and 100% Lead (Pb)âFree and Green (Halogen
Free with Commercial Standard)
Applications
â Battery Charger
â Digital Cameras and camcorder Adaptor
â PDA power supplies
â VCR, SVR, STB, DVD & DVCD Player SMPS
â SetâTop Box (STB) Power
â Auxiliary Power Supply for PC and Server
â Openâframe SMPS
Application Circuits
AC IN
D1
4-
L1
+2
C1
R5
C2 R2
R1
D2
D3
R3
C3
Naux
U1
VDDG
GND
VDD
GND
FB
DRAIN
SENSE DRAIN
RS2253
R4
C7
C4
T1
D4
C5
Np
Ns
U2
4
3
C6
R6
R7
1
2
C8
R8
D5
RS431
VOUT
GND
R9
R10
DSâRS2253â11 May, 2010
www.Orister.com
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