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参数资料
| 型号： | OM9369 |
| 厂商： | International Rectifier |
| 英文描述： | FULL-FEATURED POWER MODULE FOR HIGH VOLTAGE DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| 中文描述： | 全功能功率模块高压直接驱动三相无刷直流电动机 |
| 文件页数： | 7/10页 |
| 文件大小： | 121K |
| 代理商： | OM9369 |
TACHOMETER OUTPUT (Pin 16)
-- 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 OM9369CM
to 113
μ
s (nominal). The average value of the output
voltage on pin 16 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 24) to sense the actual
motor speed.
Note
: Whenever pin 16 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 commutations
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 17)
-- The
Brake/Tach Timing Input is a dual-purpose input.
Internal to the OM9369CM are timing components tied
from pin 17 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)
Rt + 51k
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 17
is
discharged
from
approximately
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
OM9369CM 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.
3.33V
to
OVERVOLTAGE / COAST INPUT (Pin 18)
-- This
input may be used as a shutdown or an enable/disable
input to the OM9369CM. 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 18 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 is commutated via the
power "catch" rectifiers associated with each Phase
Output.
2.1 - 7
OM9369CM
SOFT-START INPUT (Pin 19)
-- 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 20). 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 19, 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.
GROUND (Pin 20)
-- The voltages that control the
OM9369CM are referenced with respect to this pin. All
bypass capacitors, timing resistors and capacitors, loop
compensation components, and the Hall-effect filter
capacitors must be referenced as close as possible to pin
20 for proper circuit operation. Additionally, pin 20 must
be connected as close as physically possible to the Motor
Return, pin A.
HALL-EFFECT INPUTS (H1, Pin 23; H2, Pin 22; H3, Pin
21)
-- Each input has an internal pull-up resistor to the
+5V Reference. Each input also has an internal 180pF
noise filter capacitor to Ground. In order to minimize the
noise which may be coupled from the motor commutation
action to these inputs, it is strongly recommended that
additional external filter capacitors, whose value is in the
range of 2200pF, be connected from each Hall-Effect
Input pin to Ground. Whatever capacitor value is used,
the rise/fall times of each input must be guaranteed to be
less than 20us for proper tachometer action to occur.
Motors with 60 degree position sensing may be used if
one or two of the Hall-effect sensor signals is inverted
prior to connection to the Hall-Effect Inputs.
SPEED INPUT (Pin 24)
- This pin is connected to the “+”
input of a voltage comparator, whose threshold is
0.25Vdc. As long as the Speed Input is less than 0.25V,
the direction latch is transparent. When the Speed Input
is greater than 0.25V, then the direction latch inhibits all
changes in direction. It is recommended, especially while
operating in the half control mode, that the Tachometer
Output is connected to the Speed Input via a low-pass
filter,
such that the direction latch is transparent only
when the motor is spinning very slowly
. In this case,
the motor has too little stored energy to damage the
power devices during direction reversal.
相关PDF资料 |
PDF描述 |
|---|---|
| OM9369SF | FULL-FEATURED POWER MODULE FOR HIGH VOLTAGE DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| OM9369SP | FULL-FEATURED POWER MODULE FOR HIGH VOLTAGE DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR |
| OM9370SP | Industrial Control IC |
| OM9371RF | Industrial Control IC |
| OM9371SF | Industrial Control IC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| OM9369CM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FULL-FEATURED POWER MODULE FOR HIGH-VOLTAGE DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTORS |
| OM9369SF | 制造商:International Rectifier 功能描述: |
| OM9369SP | 制造商:International Rectifier 功能描述: |
| OM9370SP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Industrial Control IC |
| OM9371 | 制造商:IRF 制造商全称:International Rectifier 功能描述:25 Amp. Push-Pull 3-Phase Brushless DC Motor Controller/Driver Module in a Power Flatpack |
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