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参数资料
| 型号： | OM9373 |
| 厂商： | International Rectifier |
| 英文描述： | FULL-FEATURED POWER MODULE FOR DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| 中文描述： | 全功能直接驱动电源模块的三相无刷直流电动机 |
| 文件页数： | 10/14页 |
| 文件大小： | 150K |
| 代理商： | OM9373 |
OM9373
10
www.irf.com
TACHOMETER OUTPUT (Pin 15)
-- This output
provides a fixed width 5V pulse when any Hall-
effect Input (1, 2 or 3) changes state. The pulse width
of the Tachometer Output is set internally in the
OM9373 to 113
μ
s (nominal). The average value of
the output voltage on pin 15 is directly proportional
to the motor's speed, so this output may be used
(with an external averaging filter) as a true tachometer
output, and fed back to the Speed Input (pin 23) to
sense the actual motor speed.
Note
: Whenever pin 15 is high, the internal Hall-effect
position latches are inhibited (i.e. "latched"), to reject
noise during the chopping portion of the commutation
cycle, and this makes additional com mutations
impossible. This means that in order to prevent false
commutation at a speed less than the desired maximum
speed, the highest speed as observed at the Tachometer
Output should be set above the expected maximum
value.
BRAKE / TACH TIMING INPUT (Pin 16)
-- The
Brake/Tach Timing Input is a dual-purpose input.
Internal to the OM9373 are timing components tied
from pin 16 to Ground (a 51k
resistor and a 3300pF
capacitor) These components set the minimum pulse
width of the Tachometer Output to 113
μ
s, and this
time may be adjusted using external components,
according to the equation:
T(tach) = 0.67 x (Ct + 3300pf) x
(
Rt x 51k
)
(μs)
The recommended range of external resistance (to
Ground) is 15k
to
∞
, and the range of external
capacitance (to Ground) is 0pF to 0.01uF. With each
Tachometer Output pulse, the capacitor tied to pin
16 is discharged from approximately 3.33V to
QUAD SELECT INPUT (Pin 14)
-- This input is used
to set the OM9373 in a half control or full control
chopping regime. When driven with a logic low level,
the OM9373 is in the half control mode, whereby only
the three lower (pull-down) power switches associated
with the Phase Outputs are allowed to chop. Alternately,
when driven with a logic high level, the OM9373 is
in the full control mode, where all six power switches
(pull-up and pull-down) associated with the Phase
Outputs are chopped by the PWM. During motor braking,
changing the logic state of the Quad Select Input
has no effect on the operation of the OM9373.
Rt + 51k
approximately 1.67V by an internal timing resistor.
The Brake / Tach Timing Input has another function.
If this pin is pulled below the brake threshold
voltage, the OM9373 will enter the brake mode. The
brake mode is defined as the disabling of all three
high-side (pull-up) drivers associated with the Phase
Outputs, and the enabling of all three low-side (pull-
down) drivers.
OVERVOLTAGE / COAST INPUT (Pin 17)
-- This
input may be used as a shutdown or an enable/
disable input to the OM9373. Also, since the switching
inhibit threshold is so tightly defined, this input can
be directly interfaced with a resistive divider which
senses the voltage of the motor supply, Vm, for
overvoltage conditions. A high level (greater than the
inhibit threshold) on pin 17 causes the coast condition
to occur, whereby all Phase Outputs revert to a Hi-Z
state and any motor current which flowed prior to the
Overvoltage/ Coast command and is commutated via the
power "catch" rectifiers associated with each Phase
Output.
SOFT-START INPUT (Pin 18)
-- The Soft-Start input
is internally connected to a 10
μ
A (nominal) current
source, the collector of an NPN clamp/discharge
transistor, and a voltage comparator whose soft-
start/restart threshold is 0.2Vdc (nominal). An
external capacitor is connected from this pin to
Ground (pin 19). Whenever the Vcc supply input
drops below the turn-on threshold, approximately
9Vdc, or the sensed current exceeds the over-
current threshold, approximately 0.3V at the current
sense amplifier, the soft-start latch is set. This drives
the NPN clamp transistor which discharges the
external soft-start capacitor. When the capacitor
voltage drops below the soft-start/restart threshold
and a fault condition does not exist, the soft-start
latch is cleared; the soft-start capacitor charges via
the internal current source.
In addition to discharging the soft-start capacitor, the
clamp transistor also clamps the output of the error
amplifier internal to the controller IC, not allowing
the voltage at the output of the error amplifier to
exceed the voltage at pin 18, regardless of the
inputs to the amplifier. This action provides for an
orderly motor start-up either at start-up or when
recovering from a fault condition.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OM9373RF | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
| OM9373SF | 制造商:IRF 制造商全称:International Rectifier 功能描述:FULL-FEATURED POWER MODULE FOR DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| OM9373SP | 制造商:IRF 制造商全称:International Rectifier 功能描述:FULL-FEATURED POWER MODULE FOR DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| OM9374RF | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
| OM9374SF | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
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