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PDF LB1667M Data sheet ( Hoja de datos )
| Número de pieza | LB1667M | |
| Descripción | Two-Phase Unipolar Drive Brushless Motor Drivers | |
| Fabricantes | Sanyo | |
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Ordering number : EN*4944
Preliminary
Monolithic Digital IC
LB1668, 1668M, LB1667, 1667M
Two-Phase Unipolar Drive
Brushless Motor Drivers
Overview
The LB1668 Series are 2-phase unipolar drive brushless
motor drivers that feature a wide usable voltage range and
a minimal number of required external components. They
also support the formation of motor lock protection and
automatic recovery circuits.
Functions and Features
• Output protection Zener diodes with variable breakdown
voltages
— When the Z1 and Z2 pins are open: VOLM = 57 V
— When the Z1 and Z2 pins are shorted: VOLM = 32 V
— An external Zener diode can be connected between
Z1 and VCC.
• Can support both 12-V and 24-V power supplies by
changing an external resistor.
• Hall elements can be connected directly.
• 1.5-A output current output transistors built in
• Built-in rotation detection function that outputs low
when driven and high when stopped (LB1668/M)
• FG signal function that sets FG high when IN- is low,
and sets FG low when IN- is high (LB1667/M)
• Motor lock protection and automatic recovery functions
built in
• Thermal shutdown function
Package Dimensions
unit: mm
3098B-DIP10S
[LB1668, 1667]
unit: mm
3111-MFP14S
[LB1668M, 1667M]
SANYO: DIP10S
Specifications
Absolute Maximum Ratings at Ta = 25°C
SANYO: MFP14S
*: These specifications are subject to change for improvement without notice.
Parameter
Maximum input current
Output voltage
Output current
Output minus current
RD/FG influx current
RD/FG voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
ICC max
VOUT
IOUT
IOM
IRD/IFG
VRD/VFG
Pd max
Topr
Tstg
t ≤ 20 ms
Conditions
LB1667M, 1668M: Mounted on a printed circuit board
(20 × 15 × 1.5 mm3, glass epoxy)
LB1667, 1668
Ratings
200
Internal
1.5
–50
10
30
0.8
1.1
–30 to +80
–55 to +150
Unit
mA
V
A
mA
mA
V
W
W
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
13097HA (OT) No. 4944-1/7
1 page  
LB1668, LB1668M, LB1667, LB1667M
Design Documentation (See the application circuit diagrams)
1. Power-supply voltage (VIN pin)
The resistor R1 (when VCC = 12 V R1 = 330 Ω, and when VCC = 24 R1 = about 1.2 kΩ) is inserted between VIN and
the power supply VCC pin. When the ICC current is set in the range 6 to 50 mA, the VIN pin will be regulated to be
6.7 V. Not only does this provide stability with respect to power-supply voltage variations and motor kickback, but it
also provides adequate strength to withstand surges.
2. Output transistors (OUT1 and OUT2 pins)
A Zener diodes with the following characteristics is inserted between the collector and base of each output transistor
to absorb kickback voltages at 57 V (typical) and provide output protection.
Sustained output voltage : VO = 65 V minimum (design guarantee)
Output current
: IO = 1.5 A maximum
Output saturation voltage : VO sat = 1.25 V/1.0 A (typical)
Safe operating range
: IO = 1.0 A, VOLM = 57 V, t = 200 µs
3. Output circuit kickback voltage protection (Z1 and Z2 pins)
These ICs support output protection that minimizes kickback noise by changing the kickback absorption voltage and
absorption method according to the output current and power-supply voltage used.
— When the Z1 and Z2 pins are shorted
The output protection voltage will be 32 V (typical) using a VCC = 12 V power supply.
— When the Z1 and Z2 pins are open
The output protection voltage will be 57 V (typical) using a VCC = 24 V power supply.
— With a Zener diode inserted between Z1 and VCC or between Z1 and ground
This technique handles 120 mm H speed applications which require large output currents and involve large
amounts of heat generated in the IC by dissipating the motor coil switching loss in external Zener diodes.
4. Output protection when the motor is lock (C, RD, and FG pins)
This circuit detects motor stopping due to, for example, overloading, and cuts the coil current. It also automatically
recovers drive and motor turning from the output stopped state when the load returns to an appropriate level. The lock
detection time is set with the value of an external capacitor.
When C = 0.47 µF
Lock detection time: about 1 second
Lock protection time (output on): about 0.5 second
(output off): about 3 seconds
The RD pin (LB1668) is an open collector output and outputs a low level during drive and a high level when stopped.
The FG pin (LB1667) is an open collector output and is switched between high and low by the drive phase. It goes to
the high level when the motor is stopped.
5. Thermal shutdown
This circuit turns the output off in response to coil shorting or IC overheating.
6. In applications that use an external transistor to turn the cooling fan power on and off, connect a capacitor of about
0.47 to 10 µF between the fan power supply VCC and ground to provide a regenerative route for the fan motor coil
current.
No. 4944-5/7
5 Page | ||
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| PDF Descargar | [ Datasheet LB1667M.PDF ] | |
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