lb1694n Sanyo Semiconductor Corporation, lb1694n Datasheet - Page 6

• Manufacturer Part Number: lb1694n
• Description: 3-phase Brushless Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

1.
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
(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
2.
2-1. Reduced voltage protector
2-2. Thermal shutdown protector
3.
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.
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
5.
If the supply voltage (V
considered. The supply voltage rise rate must be such that V
desirable order of applying power is V
and then V
motors have a possibility that V
6.
Great fluctuations in the V
be connected to the V
wiring inductance component, etc. fluctuates. Because there are also fluctuations in the GND line, a capacitor needs to be
connected to the V
from being exceeded. Especially when the routing of wiring (V
adequate capacity for power line stabilization.
7.
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
operates so that the output current is limited to the 0.5/R
Hall input circuit
Protectors
If V
malfunction which may occur when V
If the junction temperature exceeds the prescribed temperature (T
protector prevents the IC from being damaged by heat. Thermal design must be such that no operation is performed in other
modes than abnormality.
FG output circuit
Forward/reverse controller
V
Power supply stabilization capacitor
Current limiter
CC
CC
and V
CC
drops below the prescribed voltage (V
off after motor stop. If, after V
M
power supplies
M
line (between V
CC
CC
line (between V
, V
CC
M
line may cause the reduced-voltage protector, etc. to malfunction. A capacitor (several µF) needs to
) rise rate is fast when power is applied, through current flows to output and ASO needs to be
M
f
between RF pin and GND. When the RF pin voltage reaches 0.5 V (typ), the current limiter
voltage rises, exceeding the withstand voltage.
M
M
power supply is off (in motor stop mode).
CC
and GND) for stabilization thus preventing malfunction and keeping the withstand voltage
CC
on first and then V
CC
and GND) for stabilization. Since a large switching current flows in the V
M
is reduced.
CC
is turned off, V
– 1.8 V). An input level that is at least three times greater than the hysteresis
LVSD
), the output transistor on the sink side turns off. This protector prevents
f
-set limiter value.
LB1694N
M
CC
CC
M
on. The desirable order of turning off power supply is V
/ t = 0.04 V/µs or less and V
, V
is turned off during motor’s inertial running, some types of
CC
SD
, or GND) is long, be sure to connect capacitors with
), the output transistor on the sink side turns off. This
+
and IN
–
.
M
/ t = 0.16 V/µs or less. The
M
No.5243-6/8
M
line,
off first