參數(shù)資料
型號(hào)： ML4426
廠商： Fairchild Semiconductor Corporation
英文描述： Bi-directional Sensorless BLDC Motor Controller(雙向無(wú)傳感無(wú)刷直流電機(jī)控制器)
中文描述： 雙向傳感器無(wú)刷直流電機(jī)控制器（雙向無(wú)傳感無(wú)刷直流電機(jī)控制器）
文件頁(yè)數(shù)： 12/16頁(yè)
文件大小： 1089K
代理商： ML4426
ML4426
12
REV. 1.0 10/10/2000
CROSS CONDUCTION COMPARATOR
When the ML4426 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 triggered 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 ML4426 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 ML4426 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 ML4426.
FUNCTIONAL DESCRIPTION
(Continued)
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
+
–
Figure 10. Cross Conduction, Brake, and UVLO Circuits
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ML4426 WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
ML4426CH 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller
ML4426CP 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller
ML4426CS 制造商:Rochester Electronics LLC 功能描述:- Bulk
ML4426IH 制造商:MICRO-LINEAR 制造商全稱(chēng):MICRO-LINEAR 功能描述:Bi-directional Sensorless BLDC Motor Controller
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