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PDF LV8121V Data sheet ( Hoja de datos )
| Número de pieza | LV8121V | |
| Descripción | 3-phase Brushless Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA2135
LV8121V
Bi-CMOS IC
For Fan Motor
3-phase Brushless Motor Driver
http://onsemi.com
Overview
The LV8121V is a three-phase brushless motor driver that uses a PWM drive technique. The motor speed is controlled
by changing the PWM duty that based on an analog voltage input. This motor driver includes an automatic return
constraint protection circuit and is optimal for driving fan motors.
Features
• PWM control based on an analog voltage input (the CTL voltage), synchronous rectification
• One Hall-effect sensor FG output
• Automatic return constraint protection circuit (ON/OFF=1/15)
• Start/Stop switching circuit, Forward/Reverse switching circuit
• Current limiter circuit, Low-voltage shutdown protection circuit, Thermal shutdown protection circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC max
VG max
VCC pin
VG pin
36 V
42 V
Output current
Allowable power dissipation
IO max
Pd max
t ≤ 500ms
Mounted on a specified board *
3.5 A
1.7 W
Operation temperature
Topr
-30 to +100
°C
Storage temperature
Tstg
-55 to +150
°C
Junction temperature
Tj max
150 °C
* Specified board : 114.3mm × 76.1mm × 1.6mm, glass epoxy board
Caution 1) Absolute maximum ratings represent the values which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
May, 2013
O2412NKPC 20120919-S00001 No.A2135-1/14
1 page  
Block Diagram
LV8121V
No.A2135-5/14
5 Page 
LV8121V
Continued from preceding page.
In case of limiting the bounce of the power supply voltage, the maximum voltage of
the VCC can be limited according to the following method. The maximum voltage of
the VG is limited by using Zener diode, NPN transistor and some resistors. Normally,
160kΩ
To VG
5.1kΩ
the relation between VG and VCC becomes “VG = VCC + 4.7V”. If VCC rises above
“VG max - 4.7V” when VG is limited to VG max, this relation does not keep.
Because the sufficient gate voltage cannot be applied to the upper side N-channel
33kΩ
5.6V
Zener
power FET when this relation does not keep, this IC includes the protective function
that turns off the upper side N-channel power FET.
Accordingly, if VCC rises above “VG max - 4.7V” when VG is limited to VG max, the upper side N-channel power
FET is turned off, and the VCC bounce caused by dropping the CTL voltage can be limited to
“VCC = VG max - 4.7V”. When the above reference circuit is used, VG is limited to about 36.7V, and VCC is limited
to about 32.0V. But this function does not guarantee that any VCC bounce can be limited. If VCC is steeply bounced
by dropping the CTL voltage, this function may not limit the VCC bounce.
4. Current Limiter Circuit
The current limiter circuit limits the output current peak to the value determined by “I = VRF/Rf” (VRF = 0.25V typ.,
Rf: current detection resistor). When the current limiter is operating, the upper side N-channel power FET is switched,
and the output current is suppressed by reducing the output duty.
5. Reference Oscillator
Connect a 56pF capacitor between CT and GND1, and a 11kΩ resistor between RT and CT. Then, the reference
oscillation frequency becomes about 2.1MHz. The reference oscillation frequency functions as a reference clock for
the internal logic circuit. The charge pump circuit boosts the voltage using a frequency that is 1/32 of the reference
oscillation frequency.
6. Start/Stop Switching Circuit
When the S/S pin is set to the low level, start/stop switching circuit is the start mode. Inversely, when the S/S pin is set
to the high level or open, start/stop switching circuit is the stop mode. This IC goes into a power saving state that
reduces the supply current at the stop mode. In the power saving state, the bias current is removed from most of the
circuits in the IC.
The operating circuits in the power saving state are limited to the start/stop switching circuit and the 5V constant
voltage output. The other circuits do not operate. Both upper side and lower side N-channel power FET are turned off
in the power saving state.
If a minus voltage is applied to the S/S pin, this pin current must be limited within 2mA by inserting the resistor of
about 200Ω.
7. Forward / Reverse Switching Circuit
The motor rotation direction can be switched by using the F/R pin. However, the following notes must be observed if
the F/R pin is switched while the motor is rotating.
• This IC is designed to avoid the through current when the direction is switched. However, the bounce of the VCC
voltage (due to the motor current that flows instantly on the power supply side) may be caused during the direction
switching. If this bounce is a problem, the capacitance inserted between VCC and GND must be increased.
• If the motor current after the direction switching exceeds the current limiter value, the upper side N-channel power
FET will be turned off, but the lower side N-channel power FET will be the short brake condition. On the short
brake condition, the current determined by the motor back EMF voltage and the coil resistance will flow. Because
the current limiter circuit of this IC cannot limit this current, applications must be designed so that this current does
not exceed the maximum rating (3.5A). When the motor speed is higher, the direction switching is dangerous.
If a minus voltage is applied to the F/R pin, this pin current must be limited within 2mA by inserting the resistor of
about 200Ω.
No.A2135-11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LV8121V.PDF ] | |
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