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參數(shù)資料
| 型號： | AS8410 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 運動控制電子 |
| 英文描述： | PWM DC Motor Regulator |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 601K |
| 代理商： | AS8410 |
PWM DC Motor Regulator – Data Sheet
AS8410
Rev. 1.0, December 2000
page
15
19
1
This input must be current limited by the external circuitry (max. 400
μ
A).
2
max. pulse duration = 1
μ
s
3
valid for I
OUT
= 5 mA ... 300 mA and Vbat = 12 V , Vpump = 22 V
4
valid for I
OUT
= 1 mA ... 5 mA and VDDA = 12 V , Vpump = 22 V
(For a fixed output current the tolerance of the current amplification factor is less than 10%.)
4.1.4
Charge pump
The charge pump generates a supply voltage about 10 V higher than the system supply voltage
Vbat (Vpump = Vbat + 10 V) to drive the gate of the external high side power FET switch.
In the case of the min. supply voltage Vbat = 6 V, the pumped voltage Vpump is about 11 V.
The load current of the external capacitors Cp1 and Cp2 is limited to max. 40 mA to prevent RF
emissions by high current peaks.
Symbol
VPP
Parameter
min
9,0
typ
10,0
max
12,0
Unit
V
Note
1
Pumped voltage difference
VPP = (Vpump – Vbat)
I
Cp1
, I
Cp2
Currents to the external capacitors
DV
Ripple of the pumped voltage Vpump
f
PWM
Frequency (internal oscillator)
1
valid for Vbat = (12.. 33) V (for Vbat = 6 V is VPP = 5 V), Vpump = Vbat + VPP
2
valid for I
Vpump
= 300 mA ( pulse duration < 1
μ
s and f
OSC
= 18 kHz ), C
p1
= C
p2
= 400 nF
40
0,70
mA
V
kHz
0,50
18
2
4.1.5
Motor current measurement unit
The motor measurement unit works with an external current measurement resistor in the high
side motor line. The nominal measurement differential voltage (V
CMp
– V
CMn
)
nom
is fixed to
50 mV (corresponding to 100% of the motor current). So the value of this measurement resistor
is given by R
meas
= 50 mV / I
motor_nom
.
The over current detection is fixed by a motor current 60 % over the nominal motor current
(I
motor_over
= 1.6 * I
motor_nom
). The switch off of the motor in case of an over current (or short circuit
of the motor) is realised in less than 2
μ
s.
Symbol
Parameter
V
CMp/CMn
Common mode voltage at the pins
CMn or CMp
V
CM_diff_nom
Nominal differential voltage of the
motor current measurement input
(V
CMp
– V
CMn
)
nom
V
CM_diff_over
Threshold voltage of the over current
detection
FI
Relative motor current measurement
error
1
I
motor_nom
= V
CM_diff_nom
/ R
meas
R
meas
is the motor current measurement resistor.
2
Over current detection at I
motor_over
= 1,6 * I
motor_nom
3
FI < 2 % of I
motor_nom
, FI = (I
motor
– I
motor_meas
) / I
motor_nom
valid for static V
CMp/CMn
or for: Vbat = 12 V , Vpump = 22 V , switching edges of V
CMp/CMn
(V
CMp/CMn_min
= -0.7 V and V
CMp/CMn_max
= Vbat) with t
rise/fall
> 200 ns
min
-1.15
typ
max
Vbat
Unit
V
Note
50
mV
1
1,6 * V
CM_diff_nom
2
2
%
3
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