LB11851FA [ONSEMI]
IC BRUSHLESS DC MOTOR CONTROLLER, Motion Control Electronics;
| 型号： | LB11851FA |
| 厂家： | 
ONSEMI |
| 描述： | IC BRUSHLESS DC MOTOR CONTROLLER, Motion Control Electronics 电动机控制 光电二极管 |
| 文件： | 总5页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number: ENA2092
LB11851FA
Monolithic Digital IC
Microprocessor Fan Motor
http://onsemi.com
Interface Driver
Overview
The LB11851FA provides an interface between a microcontroller motor control signal and external MOS transistors.
This device can implement a microprocessor fan driver with a minimal number of external components. The
LB11851FA is optimal for server and personal computer microprocessor fan drive in response to temperature or other
external signals when high precision and high air flow are required.
Features
• Fan motor interface driver function (FGIN)
⇒ This IC accepts a signal from a microcontroller and interfaces to external power transistors (PMOS and NMOS) to
provide high-efficiency low-power single-phase full-wave drive.
• Variable speed input pin (PWMIN)
⇒ PMOS side PWM control
NMOS side current regeneration using slow decay is used to achieve quite high-speed control.
• Built-in kickback absorption circuit (OUT1P/2P)
⇒ This circuit absorbs the kickback current that is generated at phase switching or power on/off to achieve smooth
current regeneration and protect the external transistors against destruction or degradation.
• Built-in current limiter circuit (SENSE)
⇒ This circuit implements a chopper-type current limiting control that operates at startup and during lock protection
mode.
The current detection voltage is set to a fixed 0.2V internally.
• Built-in microcontroller power supply (5VREG)
Semiconductor Components Industries, LLC, 2013
May, 2013
71112 SY 20120702-S00002 No.A2092-1/5
LB11851FA
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum supply voltage
V
max
18
20
CC
OUTN pin maximum output current
OUTP pin maximum output current
OUT pin voltage handling capacity
5VREG maximum output current
Allowable power dissipation
Operating temperature
IOUTN max
mA
mA
V
IOUTP max
VOUT max
I5VREG max
Pd max
20
18
20
mA
mW
°C
When mounted on the specified circuit board *1
*2
400
Topr
-40 to +90
Storage temperature
Tstg
-55 to +150
°C
*1 Specified substrate :20.0mm ×10.0mm ×0.8mm, Paper phenol board.
*2 Do not exceed Tj max = 150°C
Caution 1) Absolute maximum ratings represent the value 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.
Recommended Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
V
Supply voltage - V
V
6 to 16
2.1 to 5.0
0 to 0.4
CC
CC
PWM high-level input voltage range
VPWMINH
VPWMINL
VFGINH
VFGINL
V
PWM low-level input voltage range
FGIN high-level input voltage range
FGIN low-level input voltage range
SENSE input voltage range
V
2.1 to 5.0
0 to 0.3
V
V
VSENop
0 to 5.0
V
Electrical Characteristics at Ta = 25°C, V
= 12V
DD
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
3.5
max
6.5
Circuit current
I
1
With no load
5VREG = 10mA
5
mA
V
CC
5VREG voltage
5VREG
VSENth
FGIhi
4.8
0.15
60
5
0.19
80
5.2
SENSE pin detection voltage
FGIN high-level input current
FGIN low-level input current
PWMIN high-level current
PWMIN low-level current
0.23
100
-15
55
V
V
V
V
V
I
= 3V
= 0V
= 3V
= 0V
μA
μA
μA
μA
V
IN
IN
IN
IN
FGIlow
PWMIhi
PWMIlow
-27
35
-21
45
-27
10
-21
11
-14
11.9
OUT1P, OUT2P high-level output
voltage
V
12PH
= 10mA *2
= 1mA *2
= 10mA *2
= 1mA *2
= 10mA *1
= 1mA *1
= 10mA *1
= 1mA *1
O
O
I
I
I
I
I
I
I
11
11.3
4
V
O
O
O
O
O
O
O
OUT1P, OUT2P low-level output
voltage
V
12PL
3
5
1.5
V
O
1.2
10
V
OUT1N, OUT2N high-level output
voltage
V
12NH
9
10.8
0.1
11.9
V
O
11.1
1
V
OUT1N, OUT2N low-level output
voltage
V
12NL
2
1
V
O
0.7
V
*1 : There is a built-in 100Ω gate protection resistor.
*2 : There is a built-in 300Ω gate protection resistor.
Truth Table
FGIN
PWMIN
SENSE
L
OUT1P
OUT1N
OUT2P
OUT2N
Mode
L
H
L
L
L
L
H
L
H
L
H
L
OUT1 → 2 drive
OUT2 → 1 drive
H
H
H
H
H
H
L
L
H
H
H
H
H
L
Regeneration mode
(low side regeneration)
H
L
H
L
H
H
L
Current limiter
(low side regeneration)
H
H
Note 1 : For the SENSE pin, the "H" state is 0.2V or higher.
Note 2 : The IC goes to regeneration mode (no motor drive applied) when the microcontroller is reset (the output high-impedance state).
No.A2092-2/5
LB11851FA
Package Dimensions
unit : mm (typ)
Pin Assignment
3428
OUT2P
OUT2N
5VREG
FGIN
1
2
3
4
5
10 OUT1P
3.0
10
9
8
7
6
OUT1N
V
LB11851FA
CC
SENSE
GND
PWMIN
1
2
0.5
Top View
0.25
0.16
Pd max -- Ta
0.5
0.4
0.3
0.2
0.1
0
Specified Substrate : 20.0 10.0 0.8mm3
×
×
Paper phenol
Micro10
0.19
100
-20
20
40
-40
0
80
120
60
Ambient temperature, Ta - C
Block Diagram
V
CC
OUT1N
OUT1P
5VREG
20kΩ
300Ω
5VREG
100Ω
20kΩ
5VREG
Controller
PWMIN
FGIN
5VREG
OUT2N
OUT2P
20kΩ
300Ω
100Ω
20kΩ
SENSE
GND
No.A2092-3/5
LB11851FA
Application Circuit Example (12V)
V
=Line
M
1P
2P
1N
2N
RF
V
CC
5VREG
SENSE
V
DD
OUT2P
OUT2N
2P
2N
PWMOUT
FGOUT
PWMIN
FGIN
-
H
IN
+
IN
Microcontroller
OUT1P
OUT1N
1P
1N
PWMIN
INPUT
A/D
GND
V
SS
FG
No.A2092-4/5
LB11851FA
1. Power supply (V
and V ) and ground
M
CC
The wiring is separated into the control IC side (V
line) and the motor output side (V line) by the diode DI, which
CC
M
protects the IC from destruction on reverse connection. The application circuit uses 1μF capacitors to prevent line
oscillation when kickback occurs. Similarly, 1μF capacitors are also used on the V
stabilization.
line for power supply line
CC
2. PWMIN
The LB11851M accepts an open-drain output signal from the microcontroller with this pin and controls the on/off
states of the PMOS transistor (OUT1P and OUT2P) outputs accordingly. A constant-current bias is provided from
5VREG internally to the IC.
3. FGIN
The LB11851M accepts a CMOS output from the microcontroller with this pin and determines the drive phase output
(OUT1P, OUT2P, OUT1N, or OUT2N).
4. 5VREG
This is the power supply for the microcontroller, Hall effect sensors, and other circuits. A capacitor with a value of
1μF is used for output stabilization. This pin has an output current capacity of 20mA.
5. SENSE
A sensing resistor is used for current detection. If the SENSE pin voltage exceeds 0.2V, the PMOS transistors are
turned off and only low side regeneration is performed.
*<OUT1, 2P output H voltage / OUT1, 2N output L voltage>
Output L voltage of OUT1 and 2 sticks in GND when FET is put up outside like the example of applied circuit by
internal pull-down resistor (20KΩ), and there is no what turns on FET.
Output H voltage of OUT1 and 2 sticks in VCC with internal pull-up resistor (20kΩ) as the Pch side is also similar.
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damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual
performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical
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PS No.A2092-5/5
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