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PDF LB1695M Data sheet ( Hoja de datos )
| Número de pieza | LB1695M | |
| Descripción | DC Fan Motor Driver | |
| Fabricantes | Sanyo | |
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Ordering number : EN5802
Monolithic Digital IC
LB1695M
DC Fan Motor Driver
Overview
The LB1695M is a 3-phase brushless motor driver IC that
is optimal for driving the DC fan motors used in home
appliances such as water heaters.
Package Dimensions
unit: mm
3216A-MFP30S
[LB1695M]
Glass epoxy board with a 56%
wiring density
(When mounted)
SANYO: MFP30S
Ambient temperature, Ta - °C
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output current
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC
VM
IO
Pd max
Topr
Tstg
Conditions
When mounted on a printed circuit board (114.3 × 76.1 × 1.6 mm, glass epoxy)
Ratings
10
45
2
2
–20 to +100
–55 to +150
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Operating supply voltage range
Voltage slew rate at power on
VCC
VM
∆VCC/∆t
∆VM/∆t
At the point VCC = VLVSD (OFF)*
At the point VM = 0 V*
4.5 to 5.5
5 to 42
Under 0.04
Under 0.16
Note: For the items marked with asterisks (*), through currents may flow in the outputs if the power supply voltage slew rate is excessive.
Unit
V
V
A
W
°C
°C
Unit
V
V
V/µs
V/µs
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
12398HA(OT) No. 5802-1/6
1 page  
LB1695M
LB1695M Functional Description
1. Hall input circuit
The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typical). The operating DC level must fall
within the common-mode input voltage range (1.5 V to VCC - 1.8 V). We recommend providing inputs with a swing
of at least three times the hysteresis, i.e. 120 to 160 mV p-p, to prevent noise from interfering with circuit operation.
Insert capacitors in the Hall amplifier IN+ and IN– inputs if capacity is found to be problematic during noise
evaluation.
2. Protection circuits
• Low voltage protection circuit
If the VCC voltage falls below a stipulated level (VLVSD), the sink side output transistor is turned off. This circuit
prevents incorrect operation at low VCC voltages.
• Thermal protection circuit
If the junction temperature exceeds a stipulated temperature (TSD), the sink side output transistor is turned off. This
circuit protects the IC from thermal damage. Applications must be designed so that this circuit only operates in
abnormal conditions.
3. FG output circuit
This circuit outputs signals that are synthesized from the IN1, IN2, and IN3 Hall amplifier input signals and to which
wave shaping has been applied. FG1 has the same frequency as the Hall inputs, and FG2 has a frequency three times
that of the Hall inputs.
4. Forward/reverse control circuit
This IC is designed assuming that applications will not perform motor forward/reverse (F/R) control operations while
the motor is turning. Through currents will flow in the output if the motor direction is switched while the motor is
turning and ASO will become a problem. We recommend performing F/R control operations with the VM power
supply in the off state, i.e. when the motor is stopped.
5. VCC and VM power supplies
If the power supply slew rate at power on is excessive, through currents will flow in the output and ASO will become
a problem. The power supply slew rates must not exceed ∆VCC/∆t = 0.04 V/µs and ∆VM/∆t = 0.16 V/µs. Also, at
power on it is desirable to bring up the VCC voltage first, and then bring up the VM voltage. At power off, it is
desirable to bring down VM first, and then bring down VCC only after the motor has stopped. If VCC is turned off
after VM but while the motor is still turning due to inertia, the VM voltage may rise beyond the voltage handling
capacity of the IC.
6. Power supply stabilization capacitors
If large fluctuation occur in the VCC line, the low-voltage protection circuit may operate incorrectly. Capacitors (with
values of a few µF) must be inserted in the VCC line (between VCC and ground) to stabilize the power supply. Since
large switching current flow in the VM line, fluctuations in the IC VM voltage may occur due to inductances in the
wiring pattern. Capacitors must be inserted in the VM line (between VM and ground) so that incorrect operation and
voltages in excess of the IC voltage handling capacity do not occur. In particular, if the application wiring lines (VM,
VCC, and ground) are long, capacitors adequate to stabilize the power supply lines must be used.
7. Current limiter circuit
When the output current reaches the current set as the output current (the limit value), the current limiter circuit turns
off the sink side output transistor to limit the output current to the limit value. The RF pin is used to detect the output
current. In particular, the output current is detected as a voltage using the Rf resistor, which is inserted between the
RF pin and ground. The current limiter operates when the Rf pin reaches 0.5 V (typical) and thus the output current is
limited to a value of 0.5/Rf.
• Output off time
After the current limiter circuit operates and limits the current by turning off the sink side output transistor, it provides
a fixed off period (referred to as the output off time), after which it turns the transistor back on. As opposed to current
limiter techniques that operated the output in an unsaturated state, the use of an output switching system of this type for
the current limiter has the advantage that ASO during current limiter operation is less likely to be a problem. The
output off time is determined by the charging time of the capacitor connected to the C pin. When the current limiter
operates, the circuit starts to charge the C pin capacitor, and the output off time is the time required to charge the
capacitor to a voltage of 2 V (typical). When the capacitor voltage reaches 2 V, the sink side output is turned on again.
The capacitor charge current is a fixed current determined by the resistor R connected to the R pin. The C charge
No. 5802-5/7
5 Page | ||
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| PDF Descargar | [ Datasheet LB1695M.PDF ] | |
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