时尚词汇>徒手摘星科技节绘画Application Note AN42009 (ML AN33)
ML4824 Combo Controller Applications
幸福永久
General Description
This Application Note shows the step-by-step process to design a high performance supply. The equations shown in this document can also be ud for different output voltages and total power.
The complete power supply circuit shown in Figure 6 dem-onstrates the ML4824’s ability to manage high output power while easily complying with international requirements regarding AC line quality. The PFC ction provides 380V DC to a dual transistor current-mode forward converter. The out-put of the converter delivers +12V at up to 16 amps. The cir-cuit operates from 80 to 264V AC with both power ctions switching at 100kHz.
The PFC Stage
Powering the ML4824
The ML4824 is initialized once C 30 is charged to 13V
through R 27 and R 30 . PFC switching action now boosts the voltage on C 5 to 380V via T 1’s primary inductance. T 1 then supplies a well regulated 13V for the ML4824 from its c-ondary winding and full wave rectifier consisting of D 3 , D 4 , C 10 and C 11 . T 1’s primary to condary turns ratio (N PRI /N SEC ) is 25.5:1. For proper circuit operation, high fre-quency bypassing with low ESR ceramic or film capacitors on V CC and V REF is provided. Orderly PFC operation upon start-up is guaranteed when D 2 quick charges the boost
capacitor to the peak AC line voltage before the boost switch
Figure 1. The PFC Stage
AN42009APPLICATION NOTE
APPLICATION NOTE AN42009
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AN42009APPLICATION NOTE
APPLICATION NOTE AN42009
