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AT90PWM3 Datasheet(PDF) 129 Page - ATMEL Corporation |
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AT90PWM3 Datasheet(HTML) 129 Page - ATMEL Corporation |
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129 / 361 page  129 4317J–AVR–08/10 AT90PWM2/3/2B/3B 16. Power Stage Controller – (PSC0, PSC1 & PSC2) The Power Stage Controller is a high performance waveform controller. 16.1 Features • PWM waveform generation function (2 complementary programmable outputs) • Dead time control • Standard mode up to 12 bit resolution • Frequency Resolution Enhancement Mode (12 + 4 bits) • Frequency up to 64 Mhz • Conditional Waveform on External Events (Zero Crossing, Current Sensing ...) • All on chip PSC synchronization • ADC synchronization • Overload protection function • Abnormality protection function, emergency input to force all outputs to high impedance or in inactive state (fuse configurable) • Center aligned and edge aligned modes synchronization • Fast emergency stop by hardware 16.2 Overview Many register and bit references in this section are written in general form. • A lower case “n” replaces the PSC number, in this case 0, 1 or 2. However, when using the register or bit defines in a program, the precise form must be used, i.e., PSOC1 for accessing PSC 0 Synchro and Output Configuration register and so on. • A lower case “x” replaces the PSC part , in this case A or B. However, when using the register or bit defines in a program, the precise form must be used, i.e., PFRCnA for accessing PSC n Fault/Retrigger n A Control register and so on. The purpose of a Power Stage Controller (PSC) is to control power modules on a board. It has two outputs on PSC0 and PSC1 and four outputs on PSC2. These outputs can be used in various ways: • “Two Ouputs” to drive a half bridge (lighting, DC motor ...) • “One Output” to drive single power transistor (DC/DC converter, PFC, DC motor ...) • “Four Outputs” in the case of PSC2 to drive a full bridge (lighting, DC motor ...) Each PSC has two inputs the purpose of which is to provide means to act directly on the gener- ated waveforms: • Current sensing regulation • Zero crossing retriggering • Demagnetization retriggering • Fault input The PSC can be chained and synchronized to provide a configuration to drive three half bridges. Thanks to this feature it is possible to generate a three phase waveforms for applications such as Asynchronous or BLDC motor drive. |
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