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參數(shù)資料
| 型號： | PW-82351-120 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 150 A, XMA |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 273K |
| 代理商： | PW-82351-120 |
7
UNCOMMANDED MOTION CONTROL (UMC)
The UMC (Uncommanded Motion Control) input operates the
internal DC-DC power supply. This power supply provides all
the operating power for the high voltage side (power stage) of
the isolation barrier. When the UMC input is a logic low (0), the
DC-DC power supply is enabled and power is supplied to the
power stage. When tied to a logic high (1), the DC-DC power
supply and the input logic is disabled. The power supply for the
power stage electronics is turned off even when the high volt-
age is present on the VCC terminals. The UMC input is com-
pletely independent of the VCC and no output switching can
occur when the input is disabled, see TABLE 4.
The UMC input works in conjunction with the internal undervolt-
age detection circuitry. To insure that all internal circuitry is
properly reset during power up or power reset of the +5V
and/or +15V supplies, the UMC signal must be delayed even if
this input is not actively used (tied low). The amount of delay is
related to the rise time of the +5V power supply at J2-10,
VLPS. The rise time should take into account all local decou-
pling. The UMC signal delay can be accomplished as shown in
FIGURE 4. HYSTERESIS DEFINITION AND CHARACTERISTICS
HA,HB,HC ARE INTERNAL PW-82351 RESPONSES
TYPICAL SCHMITT RESPONSE TO NOISE INPUT
FIGURE 3 (3a and 3b) or with external logic. Whatever method
of delay is used, the RC time constant (RC = 1000C) should be
≥ the time it takes for the +5V supply to reach 4.5V. The value
of R should be set at 1k
and the capacitor varied to adjust the
time constant.
MOTOR CURRENT SENSING OUTPUTS (ISENSE)
The motor current is sensed by two internal resistors located in
the Phase A and Phase C outputs. The voltage developed
across the resistor is conditioned, scaled and transmitted
across the isolation barrier to the current mode selector. The
current mode selector, process the current signals into individ-
ual phase currents or a composite current signal.
INDIVIDUAL PHASE CURRENT MODE (IA OUT,IB OUT, IC OUT)
When individual phase current is required, the current mode
selector processes the phase A and phase C currents to derive
the phase B current. These currents are converted into a volt-
age and presented as individual phase currents IAOUT, IBOUT,
and ICOUT. The sign of the voltage indicates the direction of the
motor current. A positive voltage indicates current into the
motor and a negative voltage indicates current from the motor.
When individual phase current mode is used, the ICONTROL
input must be tied high (logic 1), see TABLE 7.
COMPOSITE PHASE CURRENT MODE (ICOMP)
When a single output signal current is desired, the composite
phase current output (ICOMP) should be used. The composite
current is derived from the Phase A and Phase C currents,
internally processed, and presented as a single bipolar voltage.
The sign of the composite voltage indicates motor torque. A
positive voltage indicates clockwise (CW) rotation and a nega-
tive voltage indicates counter clockwise (CCW) rotation. When
composite phase current mode is used, the ICONTROL must be
tied low (logic 0).
TABLE 7. PW-82351 CURRENT DE-COMMUTATION TRUTH TABLE
CONTROL
HALLS
INPUTS
HC
HB
HA
ICONTROL
0
1
X
-IA - IC
-IA - I C
IB
0
1
0
-IC
0
1
0
-IC
0
1
0
-IA
0
1
-IA
0
1
IC
0
1
0
1
IA
0
-IA - IC
PHASE CURRENT OUTPUTS
ICOMP / IB
REPRESENTATIVE
CURRENT
DERIVED
CURRENT
IB
IA
-IC
IB
-IA
IC
-IB
IB
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