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TDA5145TS Datasheet(PDF) 9 Page - NXP Semiconductors

Part No. TDA5145TS
Description  Brushless DC motor drive circuit
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 9 page
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1998 Oct 27
9
Philips Semiconductors
Product speciļ¬cation
Brushless DC motor drive circuit
TDA5145TS
APPLICATION INFORMATION
(1) Value selected for 3 Hz start-up oscillator frequency.
Fig.6 Application diagram.
handbook, full pagewidth
MGR393
220
nF
24
GND1
23
22
21
20
19
18
17
16
15
14
13
(1)
18 nF
18 nF
10
ĀµF
VMOT
VP
10
nF
123456789
10
11
BRAKE DIR
12
TDA5145TS
Introduction (see Fig.7)
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. The sequence of
the six possible states of the outputs is given in Table 1.
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
Note
1. H = HIGH state; L = LOW state; Z = high-impedance
OFF-state.
The system will only function when the EMF voltage from
the motor is present. Therefore, a start oscillator is
provided that will generate commutation pulses when no
zero-crossings in the motor voltage are available.
A timing function is incorporated into the device for internal
timing and for timing of the reverse rotation detection.
STATE
MOT1
MOT2
MOT3
1Z
L
H
2H
L
Z
3H
Z
L
4Z
H
L
5L
H
Z
6L
Z
H




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