sa828 Mitel, sa828 Datasheet
sa828
Available stocks
Related parts for sa828
sa828 Summary of contents
Page 1
... The SA828 is easily controlled by a microprocessor and its fully-digital generation of PWM waveforms gives unprecedented accuracy and temperature stability. Precision pulse shaping capability allows optimum efficiency with any power circuitry ...
Page 2
... SA828 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated + AMB DC Characteristics Characteristic Input high voltage Input low voltage Input leakage current Output high voltage Output low voltage Supply current (static) Supply current (dynamic) ...
Page 3
... PWM output pulses can be ‘tailored’ to the inverter characteristics by defining the minimum allowable pulse width (the SA828 will delete all shorter pulses from the ‘pure’ PWM pulse train) and the pulse delay (underlap) time, without the need for external circuitry. This gives cost advantages in both component ...
Page 4
... SA828 PWM SWITCHING INSTANTS +1 0 – – 1 Fig. 3 Asynchronous PWM generation with‘double-edged’ regular sampling as used by the SA828 t 1 ALE - LATCH ADDRESS Fig. 4 Intel bus timing definitions Parameter Symbol ALE high period ...
Page 5
... Motorola Mode (Fig. 5 and Table 2) The address is latched on the falling edge of the AS line. Data is written from the bus into the SA828 (only when R/W is low) on the falling edge of DS (providing CS is low). CONTROLLING THE SA828 The SA828 is controlled by loading data into two 24-bit registers via the microprocessor interface ...
Page 6
... SA828 The power frequency range is a function of the carrier waveform frequency ( f ) and a multiplication factor m , CARR determined by the 3-bit FRS word. The value determined as shown in Table 5. FRS word 110 101 100 Value Table 5 Values of carrier frequency multiplicaion factor m The power frequency range, f ...
Page 7
... Control Register Programming The control register should only be programmed once the initialisation register contains the basic operating parameters of the SA828. As with the initialisation register, control register data is loaded into the three 8-bit temporary registers R0 - R2. When all the data has been loaded into these registers it is transferred into the 24-bit control register by writing to the dummy register R3 ...
Page 8
... Holding RST low or using the SET TRIP input will ensure that the PWM outputs remain inactive (i.e., low) until the device is initialised. SA828 PROGRAMMING EXAMPLE The following example assumes that a master clock of 12·288 MHz is used (12·288 MHz crystals are readily available). ...
Page 9
... PFS PFS PFS AMP AMP AMP Fig. 17 Typical SA828 programming routine POWER ON RST 0 WRITE R0 WRITE R1 WRITE INITIALISATION DATA WRITE R2 WRITE R4 WRITE R0 WRITE R1 PWM OUTPUTS WRITE R2 RESET CYCLE WRITE R3 ENABLE RST 1 PWM OUTPUTS WRITE R0 WRITE R1 ...
Page 10
... The CLK input provides a timing reference used by the SA828 for all timings related to the PWM outputs. The microprocessor interface, however, derives all its timings from the microprocessor and therefore the microprocessor and the SA828 may be run either from the same or from different clocks. 10 WAVEFORM DEFINITION The waveform amplitude data used to construct the PWM output sequences is read from the internal 384X8 ROM ...
Page 11
... RECTIFIER AND SMOOTHING SINGLE OR 3-PHASE POWER SUPPLY Fig typical SA828 application INVERTER – DC LINK 3-PHASE VARIABLE VOLTAGE, VARIABLE FREQUENCY WAVEFORM + 6 ISOLATOR TTL LEVEL FAST PWM 6 SHUTDOWN WAVEFORMS SA828 8 DATA/ADDRESS BUS (AD - MICROPROCESSOR OR OPTIONAL EXTERNAL MICROCONTROLLER RAM WITH ON-CHIP ...
Page 12
... SA828 12 ...
Page 13
... Please contact your Mitel Semiconductor Customer Service Centre for further information. 15.24 (0·6) NOM CTRS 0·23/0·41 (0·009/0·016) NOTES 1. Controlling dimensions are inches. 2. This package outline diagram is for guidance only. Please contact your Mitel Semiconductor Customer Service Centre for further information. SA828 13 ...
Page 14
... SA828 HEADQUARTERS OPERATIONS MITEL SEMICONDUCTOR Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (01793) 518000 Fax: (01793) 518411 MITEL SEMICONDUCTOR 1500 Green Hills Road, Scotts Valley, California 95066-4922 United States of America. Tel (408) 438 2900 Fax: (408) 438 5576/6231 This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned ...