MC44605集成电路（IC）的ACDC转换器离线开关规格书PDF中文资料

MC44605属于集成电路（IC）的ACDC转换器离线开关。由安森美半导体公司制造生产的MC44605AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。

The MC44605 is a high performance current mode controller that is specifically designed for off−line converters. This circuit has several distinguishing features that make it particularly suitable for multisynchronized monitor applications.

The MC44605 synchronization arrangement enables operation from 16 kHz up to 130 kHz. This product was optimized to operate with universal mains voltage, i.e., from 80 V to 280 V, and its high current totem pole output makes it ideally suited for driving a power MOSFET.

The MC44605 protections enable a well−controlled and safe power management. Four major faults while detected, activate the analogic counter of a disabling block designed to perform a latched circuit output inhibition.

Features

• Pb−Free Package is Available*

Current Mode Controller

• Current Mode Operation up to 250 kHz Output Switching Frequency

• Inherent Feed Forward Compensation

• Latching PWM for Cycle−by−Cycle Current Limiting

• Oscillator with Precise Frequency Control

• Externally Programmable Reference Current

• Secondary or Primary Sensing (Availability of Error Amplifier Output)

• Synchronization Facility

• High Current Totem Pole Output

• Vcc Undervoltage Lockout with Hysteresis

• Low Output dV/dT for Low EMI Radiations

• Low Startup and Operating Current

Safety/Protection Features

• Soft−Start Feature

• Demagnetization (Zero Current Detection) Protection

• Overvoltage Protection Facility against Open Loop

• EHT Overvoltage Protection (E.H.T.OVP): Detection of too High Synchronization Pulses

• Winding Short Circuit Detection (W.S.C.D.)

• Limitation of the Maximum Input Power (M.P.L.): Calculation of Input Power for Overload Protection

• Overheating Detection (O.H.D.): to Prevent the Power Switch from an Excessive Heating

Latched Disabling Mode

• When one of the following faults is detected: EHT overvoltage,

Winding Short Circuit (WSCD), a too high input power (M.P.L.),

power switch overheating (O.H.D.), an analogic counter is activated

• If the counter is activated for a time that is long enough, the circuit

gets definitively disabled. The latch can only be reset by making

decrease the Vcc down to about 3.0 V, i.e., practically by unplugging

or turning off the SMPS.