Electronic Components Datasheet Search
Selected language     English  ā–¼


TDA5145 Datasheet(PDF) 10 Page - NXP Semiconductors

Part No. TDA5145
Description  Brushless DC motor drive circuit
Download  24 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

 10 page
background image
June 1994
10
Philips Semiconductors
Product speciļ¬cation
Brushless DC motor drive circuit
TDA5145
APPLICATION INFORMATION
(1) Value selected for 3 Hz start-up oscillator frequency.
Fig.7 Application diagram without use of the operational transconductance amplifier (OTA).
Introduction (see Fig.8)
Full-wave driving of a three phase motor requires three
push-pull output stages. In each of the six possible states
two outputs are active, one sourcing (H) and one sinking
(L). The third output presents a high impedance (Z) to the
motor, which enables measurement of the motor
back-EMF in the corresponding motor coil by the EMF
comparator at each output. The commutation logic is
responsible for control of the output transistors and
selection of the correct EMF comparator. In Table 1 the
sequence of the six possible states of the outputs has
been depicted.
The zero-crossing in the motor EMF (detected by the
comparator selected by the commutation logic) is used to
calculate the correct moment for the next commutation,
that is, the change to the next output state. The delay is
calculated (depending on the motor loading) by the
adaptive commutation delay block.
Because of high inductive loading the output stages
contain flyback diodes. The output stages are also
protected by a current limiting circuit and by thermal
protection of the six output transistors.
Table 1 Output states.
Note
1. H = HIGH state;
L = LOW state;
Z = high-impedance OFF-state.
The detected zero-crossings are used to provide speed
information. The information has been made available on
the FG output pin. This is an open collector output and
provides an output signal with a frequency that is half the
commutation frequency.
The system will only function when the EMF voltage from
the motor is present. Therefore, a start oscillator is
STATE
MOT1(1)
MOT2(1)
MOT3(1)
1Z
L
H
2H
L
Z
3H
Z
L
4Z
H
L
5L
H
Z
6L
Z
H




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
TDA5240TBrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5241Brushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5341Brushless DC motor and VCM drive circuit with speed control 1 2 3 4 5 MoreNXP Semiconductors
TDF5140ABrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDF5242TBrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5140ABrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5141Brushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5142TBrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5143TBrushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors
TDA5144Brushless DC motor drive circuit 1 2 3 4 5 MoreNXP Semiconductors

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights ReservedĀ© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl