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MA818

更新时间： 2024-11-20 21:54:43
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描述
THREE-PHASE PULSE WIDTH MODULATION WAVEFORM GENERATOR

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MA818 数据手册

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ADVANCEINFORMATION  
3797-2·2  
MA818  
THREE-PHASE PULSE WIDTH MODULATION WAVEFORM GENERATOR  
The MA818 PWM generator has been designed to provide  
waveforms for the control of variable speed AC machines,  
uninterruptible power supplies and other forms of power elec-  
tronic 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  
AD  
AD  
AD  
40  
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
1
0
1
2
3
4
5
6
7
V
DD  
2
A
10  
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
D
0
D
1
D
2
D
3
3
4
5
Rotational frequency is defined to 12 bits for high accuracy  
and a zero setting is included in order to implement DC injection  
brakingwithnosoftwareoverhead. Anypowerwaveformcanbe  
implemented as this is user-defined in an external PROM/  
EPROM.Forusersrequiringanon-chippre-programmedwave-  
form, the functionally identical MA828 is recommended.  
Information contained within the pulse width modulated  
sequencescontrolstheshape,powerfrequency,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 MA818 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 periph-  
eral,readingthepowerwaveformdirectlyfromaPROM/EPROM  
and requiring microprocessor intervention only when operating  
parameters need to be changed.  
6
7
8
WR* (R/W†)  
RD* (DS†)  
ALE* (AS†)  
RST  
9
MA818  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
CLK  
CS  
TRIP  
ZPP  
RPHB  
YPHB  
BPHB  
SET TRIP  
RPHT  
DC40  
DG40  
DP40  
YPHT  
V
SS  
BPHT  
* = Intel bus format  
† = Motorola bus format  
An 8-bit multiplexed data bus is used to receive addresses and  
datafromthemicroprocessor/controller.ThisisastandardMOTELTM  
bus, compatible with most microprocessors/controllers.  
6
5
4
3
2
1
44 43 42 41 40  
7
39  
38  
37  
36  
35  
34  
33  
32  
31  
30  
29  
AD  
AD  
AD  
A
6
5
6
7
The MA818 is fabricated in CMOS for low power consumption.  
8
A
5
A
4
A
3
A
2
9
10  
11  
12  
13  
14  
15  
16  
17  
WR* (R/W†)  
RD* (DS†)  
NC  
FEATURES  
MA818  
NC  
■ Fully Digital Operation  
ALE* (AS†)  
RST  
A
1
A
0
D
0
D
1
D
2
■ Interfaces with Most Microprocessors  
■ Wide Power-Frequency Range  
■ Carrier Frequency Selectable up to 24kHz  
■ Waveform Stored in External PROM/EPROM  
■ Double Edged Regular Sampling  
■ Selectable Minimum Pulse Width and Underlap Time  
■ DC Injection Braking  
CLK  
CS  
TRIP  
18 19 20 21 22 23 24 25 26 27 28  
HP44  
MOTEL is a registered Trademark of Intel Corp. and Motorola Corp.  
Fig. 1 Pin connections – top view (not to scale)  
1234567...16

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