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发布者:微桥PT2201 发布时间:2010-3-23 阅读:13824次    关键字: OB2263 SG6841
PT2201-AC-DC控制IC 停产


PT2201-Current Mode PWM Controller电流模式PWM 控制器PDF文档下载 停产

PT2201 12V5A电源方案(SCH&PCB)

PT2201_24V2A 电源方案

PT2201 SOP-8 DIP-8一般做60W以下电源 替代如下
LD7552/LD7575/LD7576=SG5841/SG6841/SG6842=OB2268/OB2269=NCP1200/NCP1203/NCP1207

GENERAL DESCRIPTION
 

PT2201 is a highly integrated current mode PWM controller. It targets at providing low standby power, low EMI and cost effective system solution for flyback converter applications. 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. Low standby power and higher conversion efficiency is thus achieved. The low VDD startup current will also contribute to low standby power. The internal LEB on the current sense input removes the signal glitch due to snubber circuit diode reverse recovery and will greatly reduces the external component count and system cost in the design.

PT2201 offers complete protection coverage with cycle-by-cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), VDD over voltage protection (OVP) and under voltage lockout (UVLO). The gate drive output is clamped at 18V to protect the power MOSFET. The tone energy in the voice band (<20kHz) will be minimized by limiting the burst mode frequency to above 22kHz. This will eliminate the potential audible noise while the system is under light or no load conditions.

The PT2201 is available in 8-pin DIP and SOP packages.
 
FEATURES
 

¨          Frequency Jittering for better EMI Performance

¨          Enhanced Burst mode for Improved Efficiency

¨          Low start up current 5uA

¨          Low operation current 1.5mA

¨          Audio Noise Free Operation

¨          Leading-edge blanking

¨          Totem pole output includes soft driving for better EMI performance

¨          Programmable PWM frequency

¨          Constant power limit for universal AC input

¨          Under Voltage Lockout (UVLO)

¨          GATE output maximum voltage clamped at 18V

¨          Built-in Overload Protection (OLP)

¨          Programmable Over temp Protection (OTP)

¨          Current mode operation with Cycle-by-cycle current limiting (OCP)

¨          VDD over voltage protection (OVP)
 
  APPLICATIONS
 

¨          Power Adaptor

¨          Battery Charger

¨          Set-Top Box Power Supplies

¨          Open-frame SMPS
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