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參數(shù)資料
| 型號： | UC2625QTR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Brushless DC Motor Controller |
| 中文描述： | 無刷直流電機控制器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 313K |
| 代理商： | UC2625QTR |
9
UC1625
UC2625
UC3625
Figure 6. Soft start discharge current vs.
temperature.
TYPICAL CHARACTERISTICS (cont.)
Figure 7. Current sense amplifier transfer function.
Power Stage Design
The UC3625 is useful in a wide variety of applications,
including high-power in robotics and machinery.
power output stages used in such equipment can take a
number of forms, according to the intended perfor-
mance and purpose of the system. Below are four differ-
ent
power
stages
with
disadvantages of each shown.
The
the
advantages
and
For high-frequency chopping, fast recovery circulating
diodes are essential. Six are required to clamp the wind-
ings. These diodes should have a continuous current
rating at least equal to the operating motor current,
since diode conduction duty-cycle can be high.
low-voltage systems, Schottky diodes are preferred. In
higher voltage systems, diodes such as Microsemi
UHVP high voltage platinum rectifiers are recom-
mended.
For
In a pulse-by-pulse current control arrangement, current
sensing is done by resistor R
S
, through which the tran-
sistor's currents are passed (Fig. A, B, and C). In these
cases, R
D
is not needed. The low-side circulating di-
odes go to ground and the current sense terminals of
the UC3625 (I
SENSE1
and I
SENSE2
) are connected to R
S
through a differential RC filter. The input bias current of
the current sense amplifier will cause a common mode
offset voltage to appear at both inputs, so for best accu-
racy, keep the filter resistors below 2k
and matched.
The current that flows through R
S
is discontinuous be-
cause of chopping. It flows during the on time of the
power stage and is zero during the off time. Conse-
quently, the voltage across R
S
consists of a series of
pulses, occurring at the PWM frequency, with a peak
value indicative of the peak motor current.
To sense average motor current instead of peak cur-
rent, add another current sense resistor (R
D
in Fig. D) to
measure current in the low-side circulating diodes, and
operate in four quadrant mode (pin 22 high). The nega-
tive voltage across R
D
is corrected by the absolute
value current sense amplifier. Within the limitations im-
posed by Table 1, the circuit of Fig. B can also sense
average current.
APPLICATION INFORMATION (cont.)
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