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參數(shù)資料
| 型號(hào)： | PWR-82521-130Z |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 18 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 150K |
| 代理商： | PWR-82521-130Z |
5
June 1, 1999; Data Device Corp.
VBUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
-
+
OFF
ON
I
VBUS
PHASE A
UPPER
PHASE A
LOWER
PHASE B
UPPER
PHASE B
LOWER
Rsense
PHASE A
PHASE B
PHASE C
+
_
OFF
I
Flyback
FIGURE 3A. STANDARD 4 QUANDRANT DRIVE FIRST
HALF OF PWM CYCLE
FIGURE 3B. STANDARD 4 QUANDRANT DRIVE SECOND
HALF OF PWM CYCLE
FUNCTIONAL AND
PIN DESCRIPTIONS:
COMMAND IN+, COMMAND IN- (Pins 30 & 31)
The command amplifier has a differential input that operates
from a ±10 V analog current comand. The differential input volt-
age may vary between ±10 VDC, maximum, corresponding to
±m(xù)aximum voltage or current for the output. Either input (COM-
MAND IN + or COMMAND IN-) may be referenced to the com-
mand ground (Pin 29) and the other input varied from ±10 VDC
to obtain full output. The COMMAND OUT signal is internally lim-
ited to approximately ±11.5 VDC; that is, inputs above or below
±11.5 VDC will be clamped to ±11.5 VDC. The input impedance
of the Command Amplifier is 10K Ohms.
The PWR-82521 can be used either as a current or voltage
mode controller. When the PWR-82521 is used as a torque
amplifier (current mode) as shown in FIGURE 13, the transfer
function of the command amplifier is 1.0 A/V. The input com-
mand signal is processed through the command buffer. The out-
put of the buffer (COMMAND OUT) is summed with the current
monitor output into the error amplifier. When external compen-
sation is used on the error amp, as shown in FIGURE 6A, the
response time can be adjusted to meet the application.
When used in the voltage mode the Voltage Command uses the
same differential input terminals to control the voltage applied to
the motor (see FIGURE 12). The error amp directly varies the
PWM duty cycle of the voltage applied to the motor phase. The
transfer function in the voltage mode is 4.7% /V ±5% variation of
the PWM duty cycle vs. input command. The duty cycle range of
the output voltage is limited to approximately 5-95% in both cur-
rent and voltage modes.
TRANSCONDUCTANCE RATIO AND OFFSET
When the PWR-82521 is used in the Current Mode, the com-
mand inputs (COMMAND IN+ and COMMAND IN-) are designed
such that ±10 VDC on either input, with the other input connect-
ed to Ground, will result in ±10 DC Average Amperes of current
into the load. The DC current transfer ratio accuracy is ±5% of
the rated output current. The initial output DC current offset with
both COMMAND IN+ and COMMAND IN- tied to the Ground will
be less than 100 mA when measured using a load of 0.5 mH and
1.0 Ohms at room ambient with standard current loop compen-
sation (see FIGURE 6A). The winding phase current error shall
be within the cumulative limits of the transconductance ratio
error and the offset error.
HALL A,B,C SIGNALS (Pins 37, 38 and 39)
These are logic signals from the motor Rotor Position Sensors
(HA, HB, HC). They use a phasing convention referred to as 120
degree spacing; that is, the output of HA is in phase with motor
back EMF voltage VAB, HB is in phase VBC, and HC is in phase
with VCA. Logic “1” (or HIGH) is defined by an input greater than
3.5 VDC or an open circuit to the controller; Logic “0” (or LOW)
is defined as any Hall voltage input less than 0.7 VDC. Internal
to the PWR-82520 are 5K pull-up resistors tied to +5 VDC on
each Hall input.
The PWR-82521 will operate with Hall phasing of 60° or 120°
electrical spacing. If 60° commutation is used, then the output of
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