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RS2253
Second‐Side Regulation Current Mode PWM Power Switcher
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 off‐line flyback converter applications in sub 10W range.
RS2253 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. RS2253 is offered in SOP‐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)
●
RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen
Free with Commercial Standard)
Applications
●
●
●
●
●
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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
1
L1
T1
R5
R2
R1
C5
C4
VOUT
D4
1
D1
4
-
+
2
C1
C2
AC IN
Np
D2
R3
C3
Naux
D3
2
3
Ns
C6
R6
GND
U1
VDDG
VDD
FB
GND
GND
DRAIN
U2
4
3
1
2
R7
R9
C8
R8
SENSE DRAIN
RS2253
R4
C7
D5
RS431
R10
DS‐RS2253‐11
May,
2010
www.Orister.com
ORISTER [ ORISTER CORPORATION ]
