RS2258 Datasheet, PDF (1/9 Pages) Orister Corporation – Second‐Side Regulation Current Mode PWM Power Switcher

RS2258
Second‐Side Regulation Current Mode PWM Power Switcher
Page No. : 1/9
General Description
RS2258 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 27W range.
RS2258 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. RS2258 is offered in DIP‐8 package.
Features
● Power on Soft Start Reducing MOSFET V_DS 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 V_DD Startup Current and Low Operating Current
● Leading Edge Blanking on Current Sense Input
● Good Protection Coverage With Auto Self‐Recovery
◎ V_DD 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)
● DIP‐8 Package
● RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen
Free with Commercial Standard)
Applications
● 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
AC IN
D1
4^-
L1
+₂
C1
C4
T1
C2 _R2
R1
D4
R5
C5
Np
Ns
C6
R6
D2
D3
R3
C3
Naux
VOUT
GND
U1
VDDG
GND
VDD
GND
FB
DRAIN
SENSE DRAIN
RS2258
R4
C7
U2
4
3
R7
1
R9
2
C8
R8
D5
RS431
R10
DS‐RS2258‐09 May, 2010
www.Orister.com