參數(shù)資料
型號(hào)： TDA5145TS
廠商： NXP SEMICONDUCTORS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Brushless DC motor drive circuit
中文描述： BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDSO24
文件頁(yè)數(shù)： 13/24頁(yè)
文件大小： 249K
代理商： TDA5145TS
June 1994
13
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145
Fig.9 CAP-CD and CAP-DC typical voltage waveforms in normal running mode.
T
HE TIMING CAPACITOR
(CAP-TI)
Capacitor CAP-TI is used for timing the successive steps
within one commutation period; these steps include some
internal delays.
The most important function is the watchdog time in which
the motor EMF has to recover from a negative diode-pulse
back to a positive EMF voltage (or vice versa). A watchdog
timer is a guarding function that only becomes active when
the expected event does not occur within a predetermined
time.
The EMF usually recovers within a short time if the motor
is running normally (
<<
ms). However, if the motor is
motionless or rotating in the reverse direction, then the
time can be longer (
>>
ms).
A watchdog time must be chosen so that it is long enough
for a motor without EMF (still) and eddy currents that may
stretch the voltage in a motor winding; however, it must be
short enough to detect reverse rotation. If the watchdog
time is made too long, then the motor may run in the wrong
direction (with little torque).
The capacitor is charged, with a current of 57
μ
A, from
0.2 to 0.3 V. Above this level it is charged, with a current of
5
μ
A, up to 2.2 V only if the selected motor EMF remains
in the wrong polarity (watchdog function). At the end, or, if
the motor voltage becomes positive, the capacitor is
discharged with a current of 28
μ
A. The watchdog time is
the time taken to charge the capacitor, with a current of
5
μ
A, from 0.3 to 2.2 V.
To ensure that the internal delays are covered CAP-TI
must have a minimum value of 2 nF. For the watchdog
function a value for CAP-TI of 10 nF is recommended.
To ensure a good start-up and commutation, care must be
taken that no oscillations occur at the trailing edge of the
flyback pulse. Snubber networks at the outputs should be
critically damped.
Typical voltage waveforms are illustrated by Fig.10.
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TDA5145TS/C1,518 功能描述:BLDC MOTOR CONTROLLER RoHS:是 類別:集成電路 (IC) >> PMIC - 電機(jī)和風(fēng)扇控制器，驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:直流電機(jī)驅(qū)動(dòng)器，步進(jìn)電機(jī)驅(qū)動(dòng)器 評(píng)估套件:- 輸出數(shù):1 或 2 電流 - 輸出:750mA 電壓 - 負(fù)載:10 V ~ 40 V 電源電壓:4.5 V ~ 5.5 V 工作溫度:-20°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-BFSOP（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOP 包裝:Digi-Reel® 其它名稱:MTS62C19A-HS105DKR
TDA5146T 制造商:NXP Semiconductors 功能描述:
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