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PDF LB11872H Data sheet ( Hoja de datos )
| Número de pieza | LB11872H | |
| Descripción | 3-Phase Brushless Motor Driver | |
| Fabricantes | Sanyo Electric | |
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Ordering number : ENN7257A
Monolithic Digital IC
LB11872H
Three-Phase Brushless Motor Driver
for Polygonal Mirror Motors
Overview
The LB11872H is a three-phase brushless motor driver
developed for driving the motors used for the polygonal
mirror in laser printers and similar applications. It can
implement, with a single IC chip, all the circuits required
for polygonal mirror drive, including speed control and
driver functions. The LB11872H can implement motor
drive within minimal drive noise due to its use of current
linear drive.
Functions and Features
• Three-phase bipolar current linear drive + midpoint
control circuit
• PLL speed control circuit
• Speed is controlled by an external clock signal.
• Supports Hall FG operation.
• Built-in output saturation prevention circuit
• Phase lock detection output (with masking function)
• Includes current limiter, thermal protection, rotor
constraint protection, and low-voltage protection circuits
on chip.
• On-chip output diodes.
Package Dimensions
unit: mm
3233A-HSOP28H
[LB11872H]
15.2
(6.2)
28 15
1
(0.8)
0.8
2.0
14
0.3 0.25
2.7
SANYO: HSOP28H
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output current
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Storage temperature
Symbol
VCC max
IO max
Pd max1
Pd max2
Topr
Tstg
Conditions
T ≤ 500 ms
Independent IC
Mounted on a PCB (114.3 × 76.1 × 1.6 mm, glass epoxy)
Ratings
30
1.2
0.8
2.0
–20 to +80
–55 to +150
Unit
V
A
W
W
°C
°C
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
www.DatapSarhameeetetr4s)Ulis.cteod min products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
91002AS (OT) No. 7257 -1/13
1 page  
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Pin Functions
Pin No.
FRAME
1
Symbol
GND
NC
GND pin
NC (No connection) pin
Pin
LB11872H
2 to 7
IN1+ to IN3+
Hall sensor input pins
IN1– to IN3–
8
AGC
Frequency characteristics correction pin
9 MN Test pin
10 NC
11 NC
12
CSD
Phase lock detection chattering prevention pin
13 NC
14 FG FG output pin
15 S/S Start/stop switching pin
16 CLK Clock signal input pin
17 LD Phase lock detection output pin
18
19
20
21
22
23
24
25
26 to 28
PD
EI
EO
FC
VREG
VCC
SUB
Rf
OUT1 to 3
Phase comparator output pin
Error amplifier input pin
Error amplifier output pin
Frequency characteristics correction pin
Stabilized power supply output pin
Power supply pin
SUBGND pin
Output current detection pin
Output pins
These pins input the Hall effect sensor signal for each
phase.
The logic of these inputs is that the input is “high” when
VIN+ is greater than VIN–.
Insert a capacitor between pin 8 and ground.
This pin must be left open.
Insert a capacitor between pin 12 and ground.
This is an open-collector output
Low: start mode
This pin goes to the on state when the phase is locked. It is
an open-collector output.
Insert a capacitor between pin 21 and ground.
Insert a capacitor between pin 22 and ground.
Connect this pin to ground.
Insert a resistor between pin 25 and ground.
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No. 7257 -5/13
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LB11872H
6. Rotor Constraint Protection Circuit
This IC provides a rotor constraint protection circuit to protect the IC itself and the motor when the motor is
constrained physically, i.e. prevented from turning. If the FG signal (edges of one type (rising or falling edges) on the
IN1 signal) does not switch within a fixed time, output drive will be turned off. The time constant is determined by
the capacitor connected to the CSD pin.
<time constant (in seconds)> .=. 30.5 × 1.57 × CCSD (µF)
If a 0.02 µF capacitor is used, the protection time will be about 1.05 seconds.
To clear the rotor constraint protection state, the IC must be set to the stopped state or the power must be turned off
and reapplied. If there is noise present on the FG signal during the constraint time, the rotor constraint protection
circuit may not operate normally.
7. Phase Lock Signal
(1) Phase lock range
Since this IC does not include a counter or similar functionality in the speed control system, the speed error range
in the phase locked state cannot be determined solely by IC characteristics. (This is because the acceleration of the
changes in the FG frequency influences the range.) When it is necessary to stipulate this characteristic for the
motor, the designer must determine this by measuring the actual motor state. Since speed errors occur easily in
states where the FG acceleration is large, it is thought that the speed errors will be the largest during lock pull-in at
startup and when unlocked due to switching clock frequencies.
(2) Masking function for the phase lock state signal
A stable lock signal can be provided by masking the short-term low-level signals due to hunting during lock pull-
in. However, this results in the lock state signal output being delayed by the masking time.
The masking time is determined by the capacitor inserted between the CSD pin and ground.
<masking time (seconds)> .=. 6.5 × 1.57 × CCSD (µF)
When a 0.022 µF capacitor is used, the masking time will be about 225 ms. In cases where complete masking is
required, a masking time with fully adequate margin must be used.
8. Initial Reset
To initially reset the logic circuits in start mode, the IC goes to the reset state when the CSD pin voltage goes to zero
until it reaches 0.63 V. Drive output starts after the reset state is cleared. The reset time can be calculated to a good
approximation using the following formula.
<reset time (seconds)> .=. 0.13 × CCSD (µF)
A reset time of over 100 µs is required.
9. Current Limiter Circuit
The current limit value is determined by the resistor Rf inserted between the RF pin and ground.
ILIM = VL/Rf VL = 0.59 V (typical) (during acceleration) and 0.37 V (typical) (during deceleration)
10. Power Supply Stabilization
An adequately large capacitor must be inserted between the VCC pin and ground for power supply stabilization. If
diodes are inserted in the power supply lines to prevent destruction of the device if the power supply is connected
with reverse polarity, the power supply line levels will be even more easily disrupted, and even larger capacitors must
be used.
If high-frequency noise is a problem, a ceramic capacitor of about 0.1 µF must also be inserted in parallel.
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No. 7257 -11/13
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