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TPIC43T02 Datenblatt(PDF) 11 Page - Texas Instruments

Teilenummer TPIC43T02
Bauteilbeschribung  THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS
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TPIC43T02 Datenblatt(HTML) 11 Page - Texas Instruments

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TPIC43T01, TPIC43T02
THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS
SLIS098 – APRIL 2000
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Table 1. FG Reference Frequency
EEPROM
EEPROM
FSEL
PRE-DIVIDER
TOTAL f(osc)
FG f(ref) @f(osc)
ADDR 1, BIT 1
ADDR 1, BIT 0
INPUT
DIVIDE BY
(osc)
DIVIDE-BY
1 MHZ
5 MHZ
10 MHZ
0
0
1
3
3072
326
1628
3256
0
0
0
6
6144
163
814
1628
0
1
1
4
4096
244
1221
2441
0
1
0
8
8192
122
610
1221
1
0
1
6
6144
163
814
1628
1
0
0
12
12,288
81
407
814
1
1
1
8
8192†
122
610
1221
1
1
0
16
16,384†
61
305
610
† Equals default value
sampling frequency for the digital filter, f(s), oscillator
An external resistor (RT) and capacitor (CT) must be connected from the respective RT and CT terminals to
GND to set the sampling frequency for the digital filter. Charge/discharge current at terminal CT will nominally
be
±2 × (1V/RT). Nominal period is determined by the formula: T(CT) = 2 × RT × CT (see Figure 5).
_
+
_
+
VDD
I(RT)
2I(RT)
IRT
RT
RT
V(RT) = 1 V
CT
CT
_
+
1.5
3.5
R
S
Q
Clock To
Digital Filter
4I(RT)
4:1
1:2
1:1
VDD
1 V Internal
Reference
I(RT)
Figure 5. Digital Filter Sampling Clock Generation


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