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SA828

更新时间： 2024-01-22 04:33:35
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MITEL /
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14页 208K
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Three-Phase PWM Waveform Generator

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SA828 数据手册

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SA828 Family  
Three-Phase PWM Waveform Generator  
DS4226 - 2.0 November 1996  
The SA828 PWM generator has been designed to provide  
waveforms for the control of variable speed AC machines,  
uninterruptible power supplies and other forms of power  
electronic devices which require pulse width modulation as a  
means of efficient power control.  
The six TTL level PWM outputs (Fig. 2) control the six  
switches in a three-phase inverter bridge. This is usually via an  
external isolation and amplification stage.  
AD  
AD  
AD  
AD  
AD  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
1
3
4
5
6
7
AD  
AD  
AD  
2
1
0
2
3
4
VDD  
5
ZPPB  
WR* (R/W†)  
RD* (DS†)  
ALE* (AS†)  
RST  
6
ZPPY  
The SA828 is fabricated in CMOS for low power  
consumption.  
7
ZPPR  
WSS  
SA828  
Information contained within the pulse width modulated  
sequences controls the shape, power frequency, amplitude,  
and rotational direction (as defined by the red-yellow-blue  
phase sequence) of the output waveform. Parameters such as  
the carrier frequency, minimum pulse width, and pulse delay  
time may be defined during the initialisation of the device. The  
pulse delay time (underlap) controls the delay between turning  
on and off the two power switches in each output phase of the  
inverter bridge, in order to accommodate variations in the turn-  
on and turn-off times of families of power devices.  
The SA828 is easily controlled by a microprocessor and its  
fully-digitalgenerationofPWMwaveformsgivesunprecedented  
accuracy and temperature stability. Precision pulse shaping  
capability allows optimum efficiency with any power circuitry.  
The device operates as a stand-alone microprocessor  
peripheral, reading the power waveform directly from an  
internal ROM and requiring microprocessor intervention only  
when operating parameters need to be changed.  
An8-bitmultiplexeddatabusisusedtoreceiveaddressesand  
data from the microprocessor/controller. This is a standard  
MOTELTMbus,compatiblewithmostmicroprocessors/controllers.  
Rotational frequency is defined to 12 bits for high accuracy  
and a zero setting is included in order to implement DC  
injection braking with no software overhead.  
This family is pin and functionally compatible with the  
MA828 PWM generator . Two standard wave shapes are  
available to cover most applications. In addition, any  
symmetrical wave shape can be integrated on-chip to order.  
8
9
RPHT  
SET TRIP  
YPHT  
BPHT  
CLK  
10  
11  
12  
13  
14  
CS  
TRIP  
RPHB  
V
SS  
YPHB  
BPHB  
DP28  
* = Intel bus format  
† = Motorola bus format  
1
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
AD  
AD  
AD  
AD  
AD  
AD  
AD  
AD  
3
4
5
6
7
2
1
0
2
3
4
VDD  
5
ZPPB  
6
WR* (R/W†)  
RD* (DS†)  
ALE* (AS†)  
RST  
ZPPY  
7
ZPPR  
WSS  
SA828  
8
9
RPHT  
SET TRIP  
YPHT  
BPHT  
CLK  
10  
11  
12  
13  
14  
CS  
TRIP  
RPHB  
V
SS  
YPHB  
BPHB  
MP28  
Fig. 1 Pin connections – top view (not to scale)  
FEATURES  
■ Fully Digital Operation  
ORDERING INFORMATION  
SA8281/IG/DP1S (28-lead DIL, sine + third harmonic  
waveform)  
■ Interfaces with Most Microprocessors  
■ Wide Power-Frequency Range  
■ 12-Bit Speed Control Accuracy  
■ Carrier Frequency Selectable up to 24kHz  
■ Waveform Stored in Internal ROM  
■ Double Edged Regular Sampling  
■ Selectable Minimum Pulse Width and Underlap Time  
■ DC Injection Braking  
SA8282/IG/DP1S (28-lead DIL, sine waveform)  
SA8281/IG/MP1S (28-lead SOIC, Sine + third  
harmonic waveform)  
SA8382/IG/MP1S (28-lead SOIC, sine waveform)  
MOTEL is a registered Trademark of Intel Corp. and Motorola Corp.  
1234567...14

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与SA828相关器件

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SA8281 MITEL

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 		Three-Phase PWM Waveform Generator
SA8281/IG/DP1S MICROSEMI

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 		1 Func, CMOS, PDIP28, PLASTIC, DIP-28
SA8281DP1S MITEL

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 		Three-Phase PWM Waveform Generator
SA8281IG MITEL

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 		Three-Phase PWM Waveform Generator
SA8281IGDMP1S DYNEX

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 		Interface Circuit
SA8281IGDP1S MICROSEMI

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 		Analog Circuit, CMOS, PDIP28
SA8281IGMP1S DYNEX

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 		Analog Circuit, CMOS, PDSO28
SA8281MP1S MITEL

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 		Three-Phase PWM Waveform Generator
SA8282 MITEL

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 		Three-Phase PWM Waveform Generator
SA8282/IG/DP1S MICROSEMI

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 		1 Func, CMOS, PDIP28, PLASTIC, DIP-28

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