ENA0845 D

Ordering number : ENA0845A
LV8800V
Bi-CMOS IC
For Notebook PC
http://onsemi.com
Fan Motor Driver
Overview
The LV8800V is a motor driver for notebook PC fans.
Feature
• Direct PWM sensorless motor driver
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Power supply voltage
Predrive voltage (gate voltage)
Output pin current
Symbol
Conditions
Ratings
Unit
VCC max
6.5
VG max
10
V
V
IOUT max
0.7
A
PWM input pin withstand voltage
VPWM max
VCC
V
FG output pin withstand voltage
VFG max
6.0
V
FG output current
IFG max
5.0
mA
Power dissipation 1
Pd max1
Independent IC
0.3
W
Power dissipation 2
Pd max2
Mounted on specified board *1
0.8
W
-30 to +95
°C
-55 to +150
°C
Operating temperature
Topr
Storage temperature
Tstg
*2
*1 : When mounted on 76.1mm×114.3mm×1.6mm glass epoxy board
*2 : Tj max = 150°C. Use the IC in the range where the temperature of the chip does not exceed Tj = 150°C during operation.
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 Conditions at Ta = 25°C
Parameter
Power supply voltage
Symbol
VCC
Semiconductor Components Industries, LLC, 2013
May, 2013
Conditions
Ratings
2.2 to 6.0
Unit
V
82907 MS 20070726-S00002 / 62007 MS PC 20070529-S00004 No.A0845-1/7
LV8800V
Electrical Characteristics Ta = 25°C, VCC = 5V, unless specifically noted
Parameter
Symbol
Ratings
Conditions
min
typ
Unit
max
Power supply current 1
ICC1
PWM pin = VCC
1.8
2.5
mA
Power supply current 2
ICC2
PWM pin = 0V
20
50
μA
Charge pump output
Output voltage
VG
9.8
V
Output block
Source
Sink
Source + sink
Ron (H)
IO = 0.5A, VG = 9.5V
0.6
1.0
Ω
Ron (L)
IO = 0.5A, VCC = 5.0V
0.6
1.0
Ω
IO = 0.5A, VCC = 5V, VG = 9.5V
1.2
2
Ω
Ron (H+L)
Startup oscillation pin
OSC pin charge current
IOSC1
-2.5
μA
OSC pin discharge current
IOSC2
2.5
μA
PWM input pin
PWM pin high-level input voltage
VPWMH
VCC×0.8
VCC
V
PWM pin low-level input voltage
VPWML
0
VCC×0.2
V
-50
μA
25
50
kHz
0.1
0.2
V
0.25
0.275
V
1.0
s
PWM pin input current
IPWM
PWM input frequency
fPWM
PWM pin = 0V
20
FG output pin
FG output pin low-level voltage
VFG
When IO = 0.5mA
VRf
RF = 0.5Ω
Current limiter circuit
Limiter voltage
0.225
Constraint protection circuit
Constraint protection detection time
RDT1
0.5
Constraint protection release time
RDT2
5
s
180
°C
30
°C
Thermal protection circuit
Thermal protection circuit operating
TSD
Design target *
ΔTSD
Design target *
150
temperature
Temperature hysteresis width
* : 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.
Package Dimensions
unit : mm (typ)
3178B
5.2
0.5
6.4
9
4.4
16
1
8
0.65
0.15
1.5max
0.22
0.1 (1.3)
(0.33)
Allowable power dissipation, Pd max – W
1.0
Pd max – Ta
Specified circuit board : 76.1×114.3×1.6mm3
glass epoxy board
0.8
0.6
0.4
0.35
0.2
0
– 30 – 20
0
20 25
40
60
80
95 100
Ambient temperature, Ta – °C
SANYO : SSOP16(225mil)
No.A0845-2/7
LV8800V
Pin Assignment
1
16 WO
UO
2
15 RF
VCC
3
14 CPC
COM
4
COMIN
5
FIL
6
11 PWM
OSC
7
10 FG
SGND
8
9
LV8800V
VO
13 CP
12 VG
F/R
Top view
Block Diagram
VG
VCC
WO
VO
TSD
UO
VREF
RF
SGND
CURRENT
LIMITTER
COM
PRE DRIVE
SELECTOR
LOCK PROTECT
LOGIC
COMIN
SENSORLESS
LOGIC
FIL
OSC
FG
PWM
OSC
FR
VG
CP
CPC
CHARGE
PUMP
MOSC
1/N
No.A0845-3/7
LV8800V
Pin Functions
Pin No.
Pin name
3
VCC
Function
Equivalent circuit
Power supply for the IC and motor. A capacitor must
3
be connected between this pin and ground.
2
UO
1
VO
16
WO
15
RF
Output pins. Connect the motor coil.
2
50kΩ
1
50kΩ
16
50kΩ
Output current detection. The drive current is
15
detected by connecting a resistor between this pin
and ground.
COMIN
VG
Motor position detection comparator filter pin. A
UO VO WO
capacitor must be connected between this pin and
the FIL pin (pin 6).
6
FIL
Motor position detection comparator filter pin. A
50kΩ
5
Motor middle point connection.
50kΩ
COM
50kΩ
4
4
1kΩ
6kΩ
6kΩ
1kΩ
capacitor must be connected between this pin and
the COMIN pin (pin 5).
7
OSC
5
Motor startup frequency setting. A capacitor must
VCC
be connected between this pin and ground. The
6
VCC
startup frequency is adjusted by controlling the
charge/discharge current (±2.5μA) and the
500Ω
capacitance of the capacitor.
7
8
SGND
9
F/R
500Ω
Ground for IC.
Motor rotation direction switching. A high-level input
causes current to flow into the motor in the order of
VCC
Reverse signal
U, V, and W and a low-level input in the order of U,
W, and V. Changing the order of current application
turns the motor in the opposite direction.
Forward/reverse
switching signal
9
100kΩ
Forward signal
10
FG
FG pulse output. This pin outputs a Hall sensor
10
system equivalent pulse signal.
11
PWM
PWM signal input. A high-level input turns on the
output transistors. A low-level input turns off the
VCC
output transistors and motor stops. The motor
speed is set by controlling the duty cycle of the input
300kΩ
PWM signal. The motor runs at full speed when this
pin is held open.
11
15kΩ
Continued on next page.
No.A0845-4/7
LV8800V
Continued from preceding page.
Pin No.
Pin name
12
VG
Function
Equivalent circuit
Charge pump step-up output. A capacitor must be
13
connected between this pin and ground.
VCC
13
CP
14
12
Charge pump step-up pulse output pin. A capacitor
must be connected between this pin and the CPC
pin (pin 14).
14
CPC
Charge pump step-up pin. A capacitor must be
connected between this pin and the CP pin (pin 13).
LV8800V Functional Description and Notes on External Components
Read the following notes before designing driver circuits using the LV8800V to design a system with fully satisfactory
characteristics.
1. Output drive circuit and speed control methods
The LV8800V adopts the synchronous commutation PWM drive method to minimize power loss in the output circuits.
Low on-resistance DMOS devices (total high and low side on-resistance of output block : 1.2Ω, typical) are used as
the output transistors.
The speed control of the driver is performed with an externally input PWM signal.
PWM controls the speed by performing switching in accordance with the duty cycle that is input to the PWM pin
(11-pin). The output transistor is on when a high-level voltage is input to the PWM pin, and off when a low-level
voltage is input. When the motor is used with the PWM pin open, the built-in resistor causes the PWM pin to change to
high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor
decelerates, and after the motor stops it enters “Power Saving Mode.
2. Soft Switching Circuit
This IC adopts variable duty soft switching to minimize the motor drive noise.
3. Current limiter circuit
The current limiter circuit limits the output current peak value to a level determined by the equation I = VRF/RF (VRF
= 0.25V typical). The current limiter circuit detects the peak current of the output transistors at the RF pin (pin 15) and
turns off the transistor of the PWM phase.
4. OSC circuit
The OSC pin (pin 7) is an oscillation pin provided for sensorless motor startup commutation. When a capacitor is
connected between the OSC pin and ground, the OSC pin starts self-oscillation, and this becomes the startup
frequency. The oscillator frequency can be adjusted by changing the value of the external capacitor (i.e. reducing the
value of the capacitor increases the startup frequency).
It is necessary to select a value of the capacitor that provides the optimal startup characteristics.
5. Position Detector Comparator Circuit for Rotor
The position detection comparator circuit for the rotor is a comparator for detecting rotor positional information with
the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies
current to the motor based on the position information obtained here. Insert a capacitor (between 1,000 and 10,000pF)
between the COMIN pin (pin 5) and FIL (pin 6) to prevent any motor startup missoperation that is caused by the
comparator input noise.
6. FG Output Circuit
The FG pin (pin 10) is the FG output pin. It provides a pulse signal equivalent to that provided by systems that use a
Hall-effect sensor.
No.A0845-5/7
LV8800V
Since the FG pin has an open drain output structure, it must be used with a pull-up resistor. Connect a pull-up resistor
on the side of the power supply where the FG signal is input. A pull-up resistor with a resistance of about 10kΩ is
recommended.
No.A0845-6/7
LV8800V
7. Charge Pump Circuit
The LV8800V n-channel DMOS output structure allows it to provide a charge pump based voltage step-up circuit. A
voltage 2 times the VCC voltage can be acquired by inserting capacitors (recommended value : 0.1μF or larger)
between the CP pin (pin 13) and CPC pin (pin 14). Note that this circuit is designed so that the stepped-up voltage
(VG) is clamped at about 9.5VDC. A larger capacitor must be used between the VG pin (pin 12) and ground if the
ripple on the stepped-up voltage (VG) results in VG exceeding 10V(VG max).
Observe the following points if the VG voltage is supplied from external circuits.
(1) The VG voltage supplied from the external circuits must not exceed the absolute maximum rating VG max.
(2) The capacitors between the CP pin (pin 13) and CPC pin (pin 14) are not required.
(3) Observe the correct sequence when turning the power supply on. Apply the VG voltage after first turning the
VCC voltage on, and cancel the VG voltage application before turning the VCC off.
(4) There is an IC-internal diode between the VCC and VG pins. Therefore, supply voltages such that VCC > VG
must never be applied to this IC.
8. Notes on PCB Pattern Design
The LV8800V is a system driver IC implemented using the Bi-CMOS process; the IC chip includes bipolar circuits,
MOS logic circuits, and MOS drive circuits. As a result, extreme care is required with respect to the pattern layout
when designing application circuits.
(1) Ground and VCC wiring layout
Insert a capacitor (recommended value : 1μF or larger) as near as possible to the pin between the power pin (pin 3)
and ground pin (pin 8).
(2) Positioning the external components
The external components that are connected to ground must be connected with lines that are as short as possible.
External components connected between IC pins must be placed as near to the pins as possible.
Application Circuit Example
1 VO
WO 16
2 UO
RF 15
0.5Ω
VCC
3 VCC
CPC 14
0.1μF
1μF
4 COM
CP 13
5 COMIN
VG 12
0.1μF
1000pF
6 FIL
PWM 11
7 OSC
FG 10
8 SGND
F/R
PWM
PWM Control Signal
f = 20k to 50kHz
2200pF
9
No.A0845-7/7
LV8800V
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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.A0845-8/8
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