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參數(shù)資料
| 型號(hào)： | LB1694N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3-Phase Brushless Motor Driver |
| 中文描述： | 三相無刷電機(jī)驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 74K |
| 代理商： | LB1694N |
1.
Hall input circuit
The Hall input circuit is a differential amplifier with hysteresis (30 mV typ). The operating DC level must be within the
common-mode input voltage range (1.5 V to V
CC
– 1.8 V). An input level that is at least three times greater than the hysteresis
(from 120 to 160 mVp-p) is recommended to be independent of noise, etc. If the handling capability needs to be considered in
noise evaluation, etc., connect a capacitor (about 0.01 μF) between the Hall inputs IN
+
and IN
–
.
2.
Protectors
2-1. Reduced voltage protector
If V
CC
drops below the prescribed voltage (V
LVSD
), the output transistor on the sink side turns off. This protector prevents
malfunction which may occur when V
CC
is reduced.
2-2. Thermal shutdown protector
If the junction temperature exceeds the prescribed temperature (T
SD
), the output transistor on the sink side turns off. This
protector prevents the IC from being damaged by heat. Thermal design must be such that no operation is performed in other
modes than abnormality.
3.
FG output circuit
IN1, IN2, and IN3 Hall input signals are composited and wave shaped to be output. FG1 has the same frequency as for Hall input,
while FG2 3-fold as many.
4.
Forward/reverse controller
No forward/reverse (F/R) switching is assumed to be performed during motor running period. If F/R switching is performed
during motor running period, through current flows to output and ASO needs to be considered. It is recommended that F/R
switching be performed when the V
M
power supply is off (in motor stop mode).
5.
V
CC
and V
M
power supplies
If the supply voltage (V
CC
, V
M
) rise rate is fast when power is applied, through current flows to output and ASO needs to be
considered. The supply voltage rise rate must be such that
V
CC
/
t = 0.04 V/μs or less and
V
M
/
t = 0.16 V/μs or less. The
desirable order of applying power is V
CC
on first and then V
M
on. The desirable order of turning off power supply is V
M
off first
and then V
CC
off after motor stop. If, after V
M
is turned off, V
CC
is turned off during motor’s inertial running, some types of
motors have a possibility that V
M
voltage rises, exceeding the withstand voltage.
6.
Power supply stabilization capacitor
Great fluctuations in the V
CC
line may cause the reduced-voltage protector, etc. to malfunction. A capacitor (several μF) needs to
be connected to the V
CC
line (between V
CC
and GND) for stabilization. Since a large switching current flows in the V
M
line,
wiring inductance component, etc. fluctuates. Because there are also fluctuations in the GND line, a capacitor needs to be
connected to the V
M
line (between V
M
and GND) for stabilization thus preventing malfunction and keeping the withstand voltage
from being exceeded. Especially when the routing of wiring (V
M
, V
CC
, or GND) is long, be sure to connect capacitors with
adequate capacity for power line stabilization.
7.
Current limiter
The current limiter turns off the sink side output transistor when the output current-set current value (limiter value) is reached. The
output current is limited by the limit value. The RF pin is used to detect the output current. The output current is detected as
voltage by connecting resistor R
f
between RF pin and GND. When the RF pin voltage reaches 0.5 V (typ), the current limiter
operates so that the output current is limited to the 0.5/R
f
-set limiter value.
LB1694N
No.5243-6/8
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