ON LV8805SV-TLM-H Bi-cmos lsi pc and server fan motor driver Datasheet

Ordering number : ENA1748B
LV8805SV
Bi-CMOS LSI
PC and Server
http://onsemi.com
Fan Motor Driver
Overview
The LV8805SV is a motor driver for PC and server fans.
Feature
• Direct PWM three-phsae sensorless motor driver
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
VCC maximum supply voltage
VCC max
16
V
VG maximum supply voltage
VG max
21
V
OUT pin withstand voltage
VOUT max
16
V
OUT pin maximum output current
IOUT max
SOFTST pin withstand voltage
VSOFTST max
UO pin, VO pin, WO pin
1.2
A
6
V
V
FR pin withstand voltage
VFR max
6
PWMIN pin withstand voltage
VPWMIN max
6
V
FG output pin withstand voltage
VFG max
16
V
FG pin output current
IFG max
5
mA
RD output pin withstand voltage
VRD max
16
V
RD pin output current
IRD max
5
mA
Allowable Power dissipation 1
Pd max1
Independent IC
0.3
W
Allowable Power dissipation 2
Pd max2
Mounted on designated board *1
Operating temperature
Topr
Storage temperature
Tstg
*2
0.95
W
-40 to +95
°C
-55 to +150
°C
*1: When mounted on the designated 76.1mm × 114.3mm × 1.6mm, glass epoxy board (single-layer)
*2: Do not exceed Tjmax=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.
Semiconductor Components Industries, LLC, 2013
May, 2013
92612NK 20120913-S00007/N0211 SY/60910 SY No.A1748-1/9
LV8805SV
Allowable Operating Conditions at Ta = 25°C
Parameter
Symbol
VCC supply voltage
VCC
SOFTST input voltage range
FR input voltage range
MINSP input voltage range
Conditions
Ratings
Unit
6 to 15
V
VSOFTST
0 to VREG
V
VFR
0 to VREG
V
VMINSP
0 to VREG
V
Electrical Characteristics at Ta = 25°C, VCC = 12V, unless otherwise specified
Parameter
Symbol
Ratings
Conditions
min
Circuit current 1
typ
Unit
max
ICC1
2.6
VVG
17
3.6
mA
Charge pump block
Charge pump output voltage
V
Regulator block
5V regulator voltage
VVREG
4.75
5
5.25
V
1.2
2
Ω
Output on resistance
Sum of high-/low-side output transistor on
Ron (H+L)
IO = 0.7A, VCC = 12V, VG = 17V
resistance
Startup oscillator (OSC) pin
OSC pin charge current
IOSCC
-2.5
μA
OSC pin discharge current
IOSCD
2.5
μA
PWM input (PWMIN) pin
High-level input voltage range
VPWMINH
2.3
VREG
Low-level input voltage range
VPWMINL
0
1
V
V
Range of PWM input frequency
fPWMIN
15
60
kHz
2.3
VREG
V
0
1
V
Forward/reverse switching pin
High-level input voltage range
VFRH
Order of current application :
UOUT→VOUT→WOUT
Low-level input voltage range
VFRL
Order of current application :
UOUT→WOUT→VOUT
FG and RD output pins
FG output pin low-level voltage
VFG
When IO is 2mA
FG output pin leak voltage
ILFG
When VFG is 16V
RD output pin low-level voltage
VRD
When IO is 2mA
RD output pin leak voltage
ILRD
When VRD is 16V
VRF
Limit current set to 1A when RF is 0.25Ω.
0.25
0.25
0.35
V
1
μA
0.35
V
1
μA
0.275
V
V
Current limiter circuit
Limiter voltage
0.225
0.25
Constraint protection circuit
CT pin high-level voltage
VCTH
2.25
2.8
2.95
CT pin low-level voltage
VCTL
0.43
0.5
0.65
V
CT pin charge current
ICTC
-2.9
-2.5
-2.1
μA
CT pin discharge current
ICTD
0.21
0.25
0.32
μA
ICT charge/discharge ratio
RCT
7
10
13
Soft start circuit
Soft start releasing voltage
VSOFTST
2.5
V
SOFTST pin charge current
ISOFTST
0.6
μA
Thermal protection circuit
Thermal protection circuit operating
TSD
Design target *
150
180
210
°C
temperature
* : Design target value and no measurement is made. The thermal protection circuit is incorporated to protect the IC from burnout or thermal destruction. Since
it operates outside the IC's guaranteed operating range, the customer's thermal design should be performed so that the thermal protection circuit will not be
activated when the fan is running under normal operating conditions.
No.A1748-2/9
LV8805SV
Package Dimensions
unit : mm (typ)
3360
Pd max - Ta
Allowable power dissipation, Pd max - W
1.2
5.2
0.5
4.4
6.4
20
12
0.5
0.22
0.15
1.5 MAX
(1.3)
(0.35)
Thermal resistance
evaluation board :
76.1 x 114.3 x 1.6mm3
glass epoxy
1.0
0.95
0.8
Thermal resistance
evaluation board
0.6
0.42
0.4
Independent IC
0.30
0.2
0.13
0
- 40
-20
0
20
40
60
80
100
120
0.1
Ambient temperature, Ta - C
SANYO : SSOP20J(225mil)
Pin Assignment
FG 1
20 SOFTST
RD 2
19 PWMIN
CT 3
18 F/R
OSC 4
GND 5
17 VREG
16 FIL
LV8805SV
VG 6
15 COMIN
CP 7
14 COM
CPC 8
13 VCC
RF 9
12 UO
WO 10
11 VO
Top view
No.A1748-3/9
LV8805SV
Block Diagram
FG
RD
FG
CT
RD
CTOSC
VG
CPC
CP
CHARGE
PUMP
VREG
REFOSC
VREG
PWMIN
SENSORLESS
LOGIC
OSC
F/R
START
OSC
PRI DRIVE
FIL
VCC
COMIN
SELECTOR
COM
CURR LIM
GND
UO
VO
WO
COM
RF
SOFTST
No.A1748-4/9
LV8805SV
Pin Function
Pin No.
1
Pin name
FG
Function
Equivalent circuit
FG pulse output. This pin outputs a Hall
1
sensor system equivalent pulse signal.
2
RD
2
Motor lockup detection output.
Output is fixed high when motor is locked up.
3
CT
Motor lockup detection time setting.
VREG
When the motor lockup condition is detected,
the protection time period before the
protection circuit is activated is set by
connecting a cacacitor between this pin and
ground.
3
4
OSC
Motor startup frequency setting. A capacitor
VREG
must be connected between this pin and
ground. The startup frequency is adjusted by
controlling the charge/discharge current and
capacitance of the capacitor.
4
5
GND
GND pin
6
VG
Charge pump step-up voltage output.
7
A capacitor must be connected between this
pin and the VCC pin or ground.
7
CP
Charge pump step-up pulse output pin.
8
VCC
VREG
6
A capacitor must be connected between this
pin and the CPC pin (pin 8).
8
CPC
Charge pump step-up pin.
A capacitor must be connected between this
pin and the CP pin (pin 7).
13
VCC
Power supply for the IC and motor.
13
Capacitors must be connected between
these pins and ground.
12
UO
Output pins. Connect these pins to the U, V,
11
VO
and W of the motor coil.
10
WO
9
RF
Output current detection pins. The drive
current is detected by connecting a resistor
12
11
10
9
between these pins and ground.
Continued on next page.
No.A1748-5/9
LV8805SV
Continued from preceding page.
Pin No.
Pin name
Function
14
COM
Motor middle point connection.
15
COMIN
Motor position detection comparator filter
Equivalent circuit
VG
pin. A capacitor must be connected between
this pin and the FIL pin (pin 16).
16
FIL
Motor position detection comparator filter
14
pin. A capacitor must be connected between
this pin and the COMIN pin (pin 15).
15 16
17
VREG
Regulator voltage (5V) output.
VCC
A capacitor must be connected between
these pins and ground.
17
VREF
18
F/R
Motor rotation direction switching. A
VREG
high-level input causes current to flow into
Reverse signal
the motor in the order of U, V, and W and a
low-level input in the order of U, W, and V.
Changing the order of current application
Forward/reverse
switching signal
18
turns the motor in the opposite direction.
Forward signal
19
PWMIN
PWM signal input pin.
VREG
"H" The output transistor is turned on by the
level voltage input. "L" The output transistor
is turned off by the level voltage input, and
the motor stops. The speed of the motor is
controlled by controlling Duty of the input
19
signal. When the pin opens, the motor
becomes all velocities.
20
SOFTST
Soft start time setting.
VREG
The motor can be started smoothly by
connecting a capacitor between this pin and
ground.
20
No.A1748-6/9
LV8805SV
Application Circuit Example
*3
VCC
UO
VG
VO
CP
WO
COM
CPC
COMIN
VREG
*10
F/R
FIL
PWMIN
PWM Control Signal
F=20kHz to 50kHz
FG
FG
PWMIN
*11
*11
RD
FG
*11
CT
SOFTST
OSC
*8
1000pF
RF
GND
*1
*1. Power supply and GND wiring
The GND is connected to the control circuit power supply system.
*2. Power-side power stabilization capacitor
For the power-side power stabilization capacitor, use a capacitor of 10μF or more.
Connect the capacitor between VCC and GND with a thick and along the shortest possible route.
LV8805SV uses synchronous rectification for high efficiency drive. Synchronous rectification is effective for heat
reduction and higher efficiency. However, it may increase supply voltage.
If the supply voltage shall increase, make sure that it does not exceed the maximum ratings by inserting a zener diode
between power supply and GND.
*3. Reverse connection protection diode
This diode protects reverse connection.
Insert a diode between power supply and VCC pin to protect the IC from destruction due to reverse connection.
Connection of this diode is not necessary required.
*4. COMIN and FIL pins
These pins are used to connect the filter capacitor. The LV8804 uses the back EMF signal generated when the motor is
running to detect the information on the rotor position. The IC dertermines the timing at which the output block
applies current to the motor based on the position information obtained here. Insert a filter capacitor with a capacitance
ranging from (1,000pF to 10,000pF) between the COMIN pin and FIL pin to prevent any motor startup missoperation
that is caused by noise. However, care must be taken since an excessively high capacitance will give rise to
deterioration in efficiency and delays in the output power-on timing while the motor is running at high speed.
Furthermore, connect the capacitor between the COMIN pin and FIL pin as close as possible in order to avoid the
effects of noise from other sources.
No.A1748-7/9
LV8805SV
*5. CT pin
This pin is used to connect the lock detection capacitor.
The constant-current charging and constant-current discharging circuits inporporated causes locking when the pin
voltage reaches 2.5V, and releasing the lock protection when it drops to 0.5V. This pin must be connected to the GND
when it is not going to be used.
*6. RF pins
These pins are used to set the current limit.
When the pin voltage exceeds 0.25V, the current is limited, and regeneration mode is established. In the application
circuit, this voltage is set in such a way that the current limit will be established at 1A.
The calculation formula is given below.
RF resistance = 0.25V/target current limit value
*7. SOFTST pin
This pin is used to set the soft start.
By connecting a capacitor between this pin and GND, the motor speed can be increased gradually.
When the pin voltage exceeds 2.5V, the soft start is released, and the LV8804V is switched to normal control.
If the soft start function is not going to be used, connect the pin to the VREG pin.
*8. OSC pin
This pin is used to connect the capacitor for setting the startup frequency.
A capacitor with a capacitance ranging from about 500pF to 2,200pF (recommendation) must be connected between
this pin and GND.
The OSC pin determines the motor startup frequency, so be sure to connect a capacitor to it.
<How to select the capacitance>
Select a capacitance value that will result in the shortest possible startup time for achieving the target speed and
produce minimal variations in the startup time. If the capacitance is too high, variations in the startup time will
increase; conversely, if it is too low, the motor may idle. The optimum OSC constant depends on the motor
characteristics and startup current, so be sure to recheck them when the type of motor used or circuit specifications are
changed.
*9. VG, CP, and CPC pins
These pins are used to connect the capacitors to generate the pre-drive voltage and stabilize the pre-drive power
supply.
Be sure to connect these capacitors in order to generate the drive voltage for the high-side (upper) output DMOS
transistor.
*10. VREG pins
These are the control system power supply pin and regulator output pin, which create the power supply of the control
unit. Be sure to connect a capacitor between this pin and GND in order to stabilize control system operation.
Since these pins are used to supply current for control and generate the charge pump voltage, connect a capacitor with
a capacitance that is higher than that of the capacitor connected to the charge pump.
Both the VREG pins (pins 3 and 4) must be short-circuited on the print pattern.
*11. Pin protection resistor
It is recommended that resistors higher than 1kΩ are connected serially to protect pins against misconnection such as
GND open and reverse connection.
No.A1748-8/9
LV8805SV
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PS No.A1748-9/9
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