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參數(shù)資料
| 型號： | ML4425CP |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Sensorless BLDC Motor Controller |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.05 A, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 167K |
| 代理商： | ML4425CP |
ML4425
PRODUCT SPECIFICATION
12
REV. 1.0.2 7/2/01
Cross Conduction Comparator
When the ML4425 goes from align mode into ramp mode,
there is a possibility of cross conduction in phase 3 of the
bridge power stage. This cross conduction can happen when
HC is on in the align mode shown as state R in Table 1, and
the controller transitions to state A in ramp mode where HC
is turned off and LC is turned on. Cross conduction can
appear due to the differences in turn on and turn off times of
the power devices. To solve this problem, the LC output
driver is gated off until the HC is equal to V
DD
– 3V as
shown in Figure 10.
Braking
When the BRAKE pin is pulled below 1.4V, the low side
output drivers LA, LB, and LC are turned on and the high
side output drivers HA, HB, HC are turned off. Braking
causes rapid deceleration of the motor and current limiting is
de-activated, and care should be taken when using the
BRAKE pin. BRAKE is has an internal 4k
pull-up as
shown in Figure 10, and can be driven by a switch to ground,
an open collector or drain logic signal, or a TTL logic signal.
Undervoltage Lockout
Undervoltage lockout is used to protect the 3-phase bridge
power stage from a low V
DD
condition. Undervoltage is trig-
gered at V
DD
of 9.5V or less and is indicated by a TTL low
output on the UV FAULT pin. Undervoltage lockout also
turns off all output drivers (LA, LB, LC, HA, HB, and HC).
The comparator that triggers undervoltage lockout has
150mV of hystresis.
Design Considerations
Interfacing to a 3-Phase Bridge Power Stage
The ML4425 output drivers are configured to drive a 3 phase
bridge power stage. For applications with buss voltages from
12V up to 80V, level shifting circuitry can be used to drive
higher voltage P-channel MOSFETS for the high side
switches as shown in Figure 11.
The most flexible configuration is to use high side drivers to
control N-Channel MOSFETs (or IGBTs) which allows
applications from less than 12V up to 600V. Figure 12 shows
the interface between the ML4425 and IR2118 high side
drivers from International Rectifier. This configuration is
capable of driving motors from busses of up to 320V. The
BRAKE pin can be pulsed prior to startup with an RC
circuit. This charges the bootstrap capacitors (C19, C20, and
C21) for the three high side drivers, allowing the reset phase
to operate normally. These capacitors must be sized so that
they stay sufficiently charged during the align mode. Refer to
AN-43 for additional applications information on the
ML4425.
Figure 10. Cross Conduction, Brake, and UVLO Circuits
2
4
3
9
10
HA
HB
HC
LA
LB
GATING
LOGIC
&
OUTPUT
DRIVERS
–
+
1.4V
9.5V
25
BRAKE
VDD
4k
14
VDD
28
GND
27
RREF
11
LC
REFERENCE
18
UV FAULT
7
VREF
FROM
COMMUTATION
STATE MACHINE
FROM
SPEED CONTROL LOOP
& CURRENT LIMIT
+
–
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4425CS | Sensorless BLDC Motor Controller |
| ML4425IP | Sensorless BLDC Motor Controller |
| ML4425IS | Sensorless BLDC Motor Controller |
| ML4426 | Bi-directional Sensorless BLDC Motor Controller(雙向無傳感無刷直流電機控制器) |
| ML4428 | Sensorless Smart-Start BLDC PWM Motor Controller(無傳感智能啟動無刷直流PWM電機控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4425CS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425CSX | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425IH | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Sensorless BLDC Motor Controller |
| ML4425IP | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4425IS | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 BLDC Motor Control Sensorless RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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