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AS8410 데이터시트(PDF) 8 Page - ams AG

부품명 AS8410
상세설명  PWM DC Motor Regulator
PDF  19 Pages
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제조업체  AMSCO [ams AG]
홈페이지  http://www.ams.com
Logo AMSCO - ams AG

AS8410 데이터시트(HTML) 8 Page - ams AG

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PWM DC Motor Regulator – Data Sheet
AS8410
Rev. 1.0, December 2000
page 8 of 19
Meaning and Settings of the external devices
Sym-
bol
Description
Typical value
Application Note
Regulation loop settings / slew rate regulation
ROSC
Resistor of the refer-
ence current genera-
tion Iref
100 k
Ω
The voltage at the pin OSC is regu-
lated to VOSC = 1 V. The reference cur-
rent is therefore 10
µA.
This current is used for three functions:
1. The oscillator frequency (Iref = 10
µA
generates fOSC = 18 kHz, fOSC is a
linear function of Iref)
2. Generation of the internal set value
voltage in OM1 together with the
resistor Rint2.
100% set value is build by a volt-
age of 2 V at pin Cint2:
VCint2(100%) = Iref * Rint2 = 2 V
3. Reference current for the power
FET driver / Slew rate regulation
(linear function between Iref and
driver output current IOUT)
Rmeas
Motor current meas-
urement resistor
Dependent on the
nominal motor
current Imotor_nom
The voltage drop over the Rmeas must
be 50 mV for the nominal motor cur-
rent: Rmeas = 50 mV / Imotor_nom
Rint2
Resistor to convert
the incoming duty
ratio of the set value
in OM1 to the set
value voltage VCint2
200 k
Ω
VCint2(100%) = Iref * Rint2 = 2 V
Cint2
Filter capacitor of the
set value conversion
in OM1
> 2.2
µF
Dependent on the incoming PWM fre-
quency fIN_PWM
fIN_PWM = 10 Hz à Cint2 > 2.2
µF
Cint1
Capacitor to set the
regulation loop time
constant and failure
handling time con-
stant
100 nF
The time constant of the failure han-
dling Tfail is determined by the max.
current at pin Cint2 (ICint1_max = 10
µA
… 15
µA) and the min. voltage to start
the PWM generator (1.66 V):
Tfail = (Cint1 * 1.66 V ) / ICint1_max
SRC1
SRC2
Feedback circuitry of
the slew rate regula-
tion
Dependent on the
application (motor
and environment)
Application Support of Austria Mikro
Systeme AG will be guaranteed
Protection Resistors
RIN
Protection resistor of
the pin IN
330
Ω
Needed in automotive applications
RMODE
Protection resistor of
the pin MODE
1 k
Ω
Needed in automotive applications
Temperature Sensor
RTP1
RTP2
Resistor divider of the
temperature sensor
RTP1 + RTP2 < 10 k
Ω The threshold voltage at the pin TP
must be 0.5 *VDD or (RTP1 = RTP2)



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