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MA828

更新时间： 2024-11-15 21:54:43
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16页 348K
描述
THREE-PHASE PULSE WIDTH MODULATION WAVEFORM GENERATOR

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MA828 数据手册

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ADVANCEINFORMATION  
3896-1·0  
MA828 FAMILY  
THREE-PHASE PULSE WIDTH MODULATION WAVEFORM GENERATOR  
The MA828 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.  
TheMA828isfabricatedinCMOSforlowpowerconsumption.  
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.  
AD  
AD  
AD  
AD  
AD  
28  
27  
26  
25  
24  
23  
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21  
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19  
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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  
7
ZPPR  
WSS  
MA828  
8
9
RPHT  
SET TRIP  
YPHT  
BPHT  
CLK  
10  
11  
12  
13  
14  
CS  
TRIP  
RPHB  
V
SS  
YPHB  
BPHB  
DP28  
The MA828 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, reading the power waveform directly from an internal ROM  
and requiring microprocessor intervention only when operating  
parameters need to be changed.  
An 8-bit multiplexed data bus is used to receive addresses and  
datafromthemicroprocessor/controller.ThisisastandardMOTELTM  
bus, compatible with most microprocessors/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 functionally identical to the MA818 PWM  
generator IC except that the waveform ROM is integrated on-  
chip; in addition, the MA828 features three Zero Phase Pulse  
(ZPP)outputsandaWaveformSamplingSynchronisationoutput  
(WSS) for use as feedback in, for example, slip compensaton  
systems. Two standard wave shapes are available to cover  
most applications; in addition, any symmetrical wave shape can  
be integrated on-chip to order.  
* = Intel bus format  
† = Motorola bus format  
1
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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  
MA828  
8
9
RPHT  
SET TRIP  
YPHT  
BPHT  
10  
11  
12  
13  
14  
CLK  
CS  
TRIP  
RPHB  
V
SS  
YPHB  
BPHB  
MP28  
Fig. 1 Pin connections – top view (not to scale)  
■ 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  
FEATURES  
■ Fully Digital Operation  
■ Interfaces with Most Microprocessors  
■ Wide Power-Frequency Range  
■ 12-Bit Speed Control Accuracy  
MOTEL is a registered Trademark of Intel Corp. and Motorola Corp.  
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