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PDF LB11693 Data sheet ( Hoja de datos )
| Número de pieza | LB11693 | |
| Descripción | Three-Phase Brushless Motor Driver | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN8095
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SANYO Semiconductors
DATA SHEET
LB11693
Monolithic Digital IC
Three-Phase Brushless Motor Driver
for 24 V Fan Motors
Overview
The LB11693 reduces motor noise by imparting a slope to the output current when switching the phase to which power
is applied. This motor driver includes an automatic recovery constraint protection circuit and is optimal for driving 24 V
fan motors.
Functions and Features
• Soft phase switching + direct PWM drive
• PWM control based on both a DC voltage input (the CTL voltage) and a pulse input
• Provides a 5 V regulator output
• One Hall-effect sensor FG output
• Integrating amplifier
• Automatic recovery constraint protection circuit (on/off = 1/14), RD output
• Current limiter circuit
• LVSD circuit
• Thermal protection circuitt
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
With an infinite heat sink
Ratings
30
1.8
3
20
–30 to +100
–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
parameters) listed in 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
N1004TN (OT) No.8095-1/12
1 page  
Pin Functions
Pin No. Symbol
Function
28 OUT1
1 OUT2 Motor drive outputs
2 OUT3
3 GND2 Motor drive output system ground
LB11693
VCC
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Equivalent circuit
300 Ω
VD 4
VM
6
4 VD Low side output transistor drive current supply
Motor drive output power supply and output current
detection
6 VM Connect the resistor Rf between this pin and VCC.
The output current will be limited to the current value set
by the equation IOUT = VRF/Rf.
5
VCC
Power supply for systems other than the motor drive
output
VCC
1 2 28
3
5 V regulator output
7 VREG Insert a capacitor (about 0.1 µF) between this pin and
ground for stabilization.
7
Undervoltage protection voltage detection
8
LVS
To detect VREG, connect this pin to VREG.
To detect VCC, set the detection voltage by inserting a
zener diode in series.
VREG
VREG
FG filter connection
9 FGFIL This pin is normally left open. If noise on the FG signal is a
problem, insert a capacitor between this pin and ground.
52 kΩ
9.5 kΩ
8
300 Ω
9
Continued on next page.
No.8095-5/12
5 Page 
LB11693
possible if the braking current is limited to be under Iomax (1.8 A) by the motor coil resistancewowrwo.tDhaertafSahcetoerts4.UA.closom,
since a transient through current will flow at the instant the direction is switched if the direction switching operation is
performed just from the F/R pin, a period where drive is turned off must be provided when switching directions.
Through currents must be prevented by setting the IC to the stop state with the S/S pin or TOC pin to provide a drive off
period where the duty due to the PWMIN pin is set to 0% and switching the F/R pin during that period.
9. Power Saving Circuit
This IC goes to a low-power mode (power saving state) when set to the stop state with the S/S pin. In the power saving
state, the bias currents in most of the circuits are cut off. However, the 5 V regulator output is still provided in the
power saving state.
10. Notes on the PWM Frequency
The PWM frequency is determined by the capacitor C (F) connected to the PWM pin.
fPWM ≈ 1/(23400 × C)
It is preferable to use a frequency in the range 15 kHz to 25 kHz for the PWM frequency. The connected capacitor must
be connected to the GND1 pin with a line as short as possible.
11. Control Methods
The output duty can be controlled by either of the following methods
• Control based on comparing the TOC pin voltage to the PWM oscillator waveform
The low side output transistor duty is determined according to the result of comparing the TOC pin voltage to the
PWM oscillator waveform. When the TOC pin voltage is 1.3 V or lower, the duty will be 0%, and when it is 3.0 V
or higher, the duty will be 100%.
Since the TOC pin is the output of the control amplifier (CTL), a control voltage cannot be directly input to the
TOC pin. Normally, the control amplifier is used as a full feedback amplifier (with the EI– pin connected to the
TOC pin) and a DC voltage is input to the EI+ pin (the EI+ pin voltage will become equal to the TOC pin voltage).
When the EI+ pin voltage becomes higher, the output duty increases. Since the motor will be driven when the EI+
pin is in the open state, a pull-down resistor must be connected to the EI+ pin if the motor should not operate when
EI+ is open.
When TOC pin voltage control is used, a low-level input must be applied to the PWMIN pin or that pin connected
to ground.
• Control based on a pulse signal input to the PWMIN pin
A pulse signal with a frequency in the range 15 to 25 kHz can be input to the PWMIN pin, and the duty of the low
side output transistor can be controlled based on the duty of that input signal. Note that the output is on when a low
level is input to the PWMIN pin, and off when a high level is input. When the PWMIN pin is open it goes to the
high level input and the output is be turned off.
When controlling motor operation from the PWMIN pin, the EI– pin must be connected to ground, and the EI+ pin
must be connected to the TOC pin.
12. Undervoltage Protection Circuit
The undervoltage protection circuit turns the low side output transistor off when To the power supply
the LVS pin voltage falls below the minimum operation voltage (about 3.8 V). level to be detected
The operating voltage detection level is set up for 5 V systems. The detected
voltage level can be increased by shifting the voltage by inserting a zener diode
in series with the LVS pin. The LVS influx current during detection is about
To the LVS pin
65 µA. To minimize the effect of sample-to-sample variations in the zener
voltage, the current flowing in the zener diode must be increased thus
stabilizing the rise in the zener diode voltage. If this is required, insert a resistor between the LVS pin and ground.
If the LVS pin is left open, the internal pull-down resistor will result in the IC seeing a ground level input, and the
output will be turned off. Therefore, a voltage in excess of the LVS circuit clear voltage (about 4.3 V) must be applied
to the LVS pin if the application does not use the undervoltage protection circuit. The maximum rating for the LVS pin
applied voltage is 30 V.
13. Constraint Protection Circuit
When the motor is physically constrained (held stopped), the CSD pin external capacitor is charged (to about 3.0 V) by
a constant current of about 2.4 µA and is then discharged (to about 1.0 V) by a constant current of about 0.17 µA. This
process is repeated, generating a sawtooth waveform. The constraint protection circuit turns motor drive (the low side
No.8095-11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LB11693.PDF ] | |
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