Datasheet

7734Q–AVR–02/12

AT90PWM81/161

12. Power Stage Controller – (PSCn)

The Power Stage Controller is a high performance waveform controller.

The Atmel AT90PWM81 includes one PSC2 block.

12.1 Features

• PWM waveform generation function (two complementary programmable outputs)

• Dead time control

• Standard mode up to 12 bit resolution

• Frequency and pulse width resolution enhancement mode (12 + 4 bits)

• Frequency up to 64Mhz

• Conditional waveform on external events (zero crossing, current sensing ...)

• All on chip PSC synchronization

• ADC synchronization with digital delay register

• Input blanking

• Overload protection function

• Abnormality protection function, emergency input to force all outputs to low level

• Center aligned and edge aligned modes synchronization

• Fast emergency stop by hardware

12.2 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 2. However, when using the register

or bit defines in a program, the precise form must be used, that is, PSOC2 for accessing PSC

2 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, that is, PFRC2A for accessing

PSC n Fault/Retrigger 2 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 PSCn and four outputs on PSC2.

These outputs can be used in various ways:

• “Two Outputs” 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.