PT2201 Datasheet

时间: 2009-06-26 来源: Seawin 浏览量:

文件类型：

文件大小：下载次数:

PT2201 Datasheet 文件类型: *

[ 本地下载 ]

   Current Mode PWM Controller
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
TYPICAL APPLICATIONS