Datasheet

147
7734Q–AVR–02/12
AT90PWM81/161
13. Reduced Power Stage Controller – (PSCR)
The Reduced Power Stage Controller is a high performance waveform controller.
13.1 Features
• PWM waveform generation function (two complementary programmable outputs)
• Dead time control
• Standard mode up to 12-bit resolution
• Enhanced resolution up to 16 bits
• Frequency up to 64Mhz
• Conditional waveform on external events (zero crossing, current sensing ...)
• ADC synchronization
• Overload protection function
• Abnormality protection function, emergency input to force all outputs to high impedance or in
inactive state (fuse configurable)
• Fast emergency stop by hardware
13.2 Overview
Many register and bit references in this section are written in general form.
• A lower case “r” (or “n” replaces the PSC number, in this case 0. However, when using the
register or bit defines in a program, the precise form must be used, that is, PSOC0 for
accessing PSCR 0 Synchro and Output Configuration register and so on
• A lower case “x” replaces the PSCR 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, PFRC0A for
accessing PSCR 0 Fault/Retrigger 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.
These outputs can be used in various ways:
• “Two Outputs” to drive a half bridge (for example, Lighting applications)
• “One Output” to drive single power transistor (for example, DC/DC converter, PFC
applications)
The PSCR 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