A5936GLNTR-T [ALLEGRO]
Three Phase Sensorless Sinusoidal Fan Driver;
| 型号： | A5936GLNTR-T |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Three Phase Sensorless Sinusoidal Fan Driver |
| 文件： | 总12页 (文件大小：668K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
A5936
Three Phase Sensorless Sinusoidal Fan Driver
FEATURES AND BENEFITS
DESCRIPTION
• Standby mode
The A5936 three phase motor driver incorporates sinusoidal
drive to minimize vibration for fan applications.
• Sensorless operation
• Low-noise sinusoidal modulation
• Quiet startup
• Low RDSON power MOSFETs
• Minimal external components
• PWM speed input
A sinusoidal voltage profile is applied to the windings of the
motor at startup to quickly and quietly start up and gradually
ramp up the motor to desired speed.
Themotorspeediscontrolledbyapplyingadutycyclecommand
to the PWM input. The PWM input is allowed to operate over
a wide frequency range.
• FG speed output
• Lock detection
• Soft start
• Short-circuit protection (OCP)
• Overcurrent limit (OCL)
The A5936 is available in a 10-lead SSOP (suffix LN), and
a 10-lead eSOIC with exposed power pad (suffix LK). The
packages are lead (Pb) free, with 100% matte-tin leadframe
plating.
PACKAGES:
10-lead SSOP (suffix LN)
10-lead eSOIC with exposed
thermal pad (suffix LK)
Not to scale
TYPICAL APPLICATION
0.1 µF X5R 10 V
VREF
2p8 VREF
OCP
Protection
VBB
10 µF
Duty
Demand
Calculator
Speed Input
PWM
OUTA
OUTB
OUTC
6
GATE
DRIVE
DMD
ACC
Sine
Drive
Waveshape
Startup
Logic
GND
Master
Clock
Current
Limit
TSD
OUTA
OUTB
OUTC
FG
Position
Detect
A5936-DS, Rev. 3
MCO-0000156
July 15, 2019
A5936
Three Phase Sensorless Sinusoidal Fan Driver
SELECTION GUIDE
Part Number
Ambient Temperature Range
–40°C to 105°C
Packing
Package
A5936GLKTR-T
A5936GLNTR-T
3000 pieces per 13-inch reel 10-lead eSOIC with exposed thermal pad
–40°C to 105°C
3000 pieces per 13-inch reel
10-lead SSOP
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Notes
Value
20
Unit
V
tw < 10 ms
Supply Voltage
VBB
18
V
Logic Input Voltage Range
VIN
PWM, DMD
–0.3 to 6
V
Logic Output
VO
VIN
FG
VBB
–0.3 to VREF
IOCL
V
V
Analog Input Range
Output Current
ACC
IOUT
VOUT
TA
A
Output Voltage
OUTA, OUTB, OUTC
G temperature range
VBB + 1
–40 to 105
150
V
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature
°C
°C
°C
TJ(max)
Tstg
–55 to 150
THERMAL CHARACTERISTICS
Characteristic
Symbol
Package
Test Conditions
Value
Unit
LK
LN
2-sided PCB with 1 in.2 copper
2-sided PCB with 1 in.2 copper
35
°C/W
Package Thermal Resistance
RθJA
100
°C/W
Terminal List Table
Pin Number
Name
PWM
1
10
9
ACC
DMD
Function
LN
LK
FG
2
PAD
VBB
3
8
VREF
OUTC
GND
PWM
FG
1
1
Logic input – speed demand
Output signal
OUTA
4
7
2
2
OUTB
5
6
VBB
3
3
Input supply
Package LK Pinouts
OUTA
OUTB
GND
OUTC
VREF
DMD
ACC
4
4
Motor terminal
Motor terminal
Ground
5
5
PWM
FG
10
9
ACC
1
2
3
4
5
6
6
DMD
VREF
OUTC
GND
7
7
Motor terminal
Reference voltage output
Logic input
VBB
8
8
8
OUTA
OUTB
7
6
9
9
10
–
10
Analog input
Package LN Pinouts
PAD
PAD Thermal pad
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
ELECTRICAL CHARACTERISTICS: Valid at TA = 25°C, VBB = 5 to 16 V, unless otherwise specified
Characteristic
Symbol
IBB
Test Conditions
Active Mode (PWM duty < DC_ON)
Standby Mode
Min.
–
Typ.
7.5
<1
2.9
–
Max.
10
10
2.95
–
Unit
mA
µA
V
VBB Supply Current
IBBS
VREF
VIL
–
VREF Output Voltage
I = 0 to 5 mA
2.85
0.8
–
Logic Input Low Level
Logic Input High Level
Logic Input Hysteresis
Input Current (DMD, PWM, ACC)
Output Saturation Voltage (FG)
Output Leakage (FG)
V
VIH
–
2
V
VHYS
IIN
VSAT
IFG
200
–10
–
300
<1
–
600
10
0.3
5
mV
µA
V
I = 5 mA
V = 16 V, PWM = Low
–
–
µA
POWER DRIVER
Total Driver On-Resistance
(Sink + Source)
RDS(on)
I = 1 A, TJ = 25°C, VBB = 8 V
Source driver
–
–
1
650
350
–
1.25
–
Ω
mΩ
mΩ
Ω
Sink driver
–
–
I = 1 A, TJ = 25°C, VBB = 4 V
–
2
Motor PWM Frequency
PWM Duty Cycle Range
Duty Cycle On Threshold
Duty Cycle Off Threshold
ACC Accuracy
fPWMOUT
fPWMIN
DCON
23.4
0.1
–
24.4
–
25.4
100
–
kHz
kHz
%
10
7.4
–
DCOFF
VACC
–
–
%
Relative to Parameter Table Target
VBB rising
–40
40
mV
PROTECTION
Lock Protection
tOFF
4.8
–
5
4.7
3.85
850
2
5.2
4.9
3.95
–
s
V
VBB Undervoltage Lockout (UVLO)
VBBUVLO
V
BB falling
–
V
VBB UVLO Hysteresis
VBBUVLOHYS
IOCL
–
mV
A
Overcurrent Limit
1.5
150
–
3
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TJTSD
Temperature increasing
165
35
180
–
°C
°C
ΔTJ
Recovery = TJTSD – ΔTJ
Note 1: Specified limits are tested at a single temperature and assured across the operating temperature range by design and characterization.
3
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
FUNCTIONAL DESCRIPTION
The A5936 targets fan applications to meet the objectives of low
audible noise, minimal vibration, and high efficiency. Allegro’s
This 9-bit “demand” is applied to a PWM generator block to
create the modulation profile. The modulation profile is applied
proprietary control algorithm results in a sinusoidal current wave- to the three motor outputs, with 120-degree phase relationship, to
shape that adapts to a variety of motor characteristics to dynami-
cally optimize efficiency across a wide range of speeds.
create the sinusoidal current waveform as shown in Figure 1.
A BEMF detection “window” is opened on phase A modulation
profile to measure the rotor position so as to define the modula-
tion timing. The control system maintains the window to a small
level to minimize the disturbance and approximate the ideal
The speed of the fan can be controlled by voltage mode (control
of power supply amplitude) or variable duty cycle PWM input.
Use of the PWM input allows overall system cost savings by
eliminating the requirement of an external variable power supply. sinusoidal current waveform as much as possible.
Operation down to 4 V can be achieved to allow the IC to fit into
Protection features include lock detection with restart, overcur-
legacy systems with voltage mode operation.
rent limit, motor output short circuit, supply undervoltage moni-
The PWM input is measured and converted to a 9-bit number.
tor, and thermal shutdown.
FG
OUTA
OUTB
OUTC
iB
iC
iA
Figure 1: Sinusoidal PWM
4
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Lock Detect. Speed is monitored to determine if rotor is locked.
If a lock condition is detected, the IC will be disabled for tOFF
before an auto-restart is attempted.
ACC. Startup setting selection (see Startup section).
DMD. Startup setting selection (see Startup section).
PWM. A duty cycle measurement circuit converts the applied
duty to a demand value (9-bit resolution) to control speed of the
fan. The motor drive will be enabled if duty is larger than DC_
ON. The PWM input is filtered to prevent spurious noise from
turning on or off unexpectedly.
Standby Mode. Standby mode can be achieved by holding
PWM pin low for longer than the Lock off-time. The IC powers
up in standby mode. Standby mode is released after a short pulse
(>1 µs) is applied to PWM pin. During standby mode, VREF is
powered down to allow minimum current draw.
Power Supply Modulation. Speed can be controlled simply by
varying the power supply voltage. Motor drive will be enabled
and disabled at undervoltage rising and falling thresholds. To
use this method of speed control, pullup PWM pin to VBB with
50 kΩ resistor.
FG. Open-drain output provides speed information to the system.
For the default setting, FG changes state one period per electrical
revolution of the motor (as shown in Figure 1).
Current Limit. Load current is monitored on the low-side MOS-
FET. If the current has reached IOCL, the source drivers will turn
off for the remaining time of the PWM cycle.
100
25
10
7.5%
Disabled
Duty IN
DC_OFF
DC_ON
100%
Figure 2: PWM Speed Input Characteristic
5
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Quiet Startup Operation
Initialize
Position Sensing
Ramp
Accelerate
1.6 s
500 ms
Steady State
1.23 s
DC_EXT
Initial Soft-Start
Demand
IOUT
Time
Figure 3: Applied Demand (Modulated Voltage) and
Resultant (IOUT) Typical Wave During Startup
A5936 achieves quiet startup with the following sequence:
6. Ramp up duty to final value:
1. The Demand value is selected by combination of logic level
on DMD voltage applied to pin ACC.
A. Time to ramp to final value depends on initial demand
(VINIT), VBB, and applied input duty (DC_EXT).
2. Slowly ramp PWM duty from low value to a chosen Open-
Loop Demand level by applying one cycle of sine drive at
frequency of 812 mHz.
B. The ramp rate is 15 ms/count for duty < 25% and 7.5 ms/
count for duty cycles > 25%
Example:
3. Ramp up frequency of open-loop sinusoidal modulation for
1.6 s. The acceleration value is selected by voltage applied to
pin ACC.
VBB = 12 V, VINIT = 6 V, DC_EXT = 80%
Initial Soft-Start Demand = [(VINIT/VBB) × 51%] =
25.5% → Counts = 511 × 25.5% = 130
DC_EXT = 80% → Counts = 511 × 80% = 409
T_RAMP = (409 – 130) × 7.5 ms/count → 2 s
4. Switch to position measurement mode, and apply an initial
soft-start demand level of 51% of the level applied during
acceleration stage.
5. Hold the PWM duty at same level for 500 ms. This short
delay helps the motor synchronize.
6
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Startup Adjustment
Various permutations of startup parameters are chosen via lookup
table with A/D conversion.
VREF
DMD
Parameter
Look Up
Table
Mux
Select
Control
Logic
Sixteen choices of startup parameters are selected by applying
voltage at pin ACC.
Choose resistor divider ratio from the table below. The circuit
compensates for minor variation of VREF. It is recommended to
select R1+R2 in range 10 to 200 kΩ. ACC must be connected to
a voltage between VREF and GND and should not be left open
circuit.
VREF
R1
0...15
ACC
A/D
R2
The parameters are loaded at power-on. When testing, VBB must
be powercycled to check new values.
Figure 4
VINIT (V)
VINIT (V)
Max.
Electrical
Resistor
Ratio
Standard
Values (kΩ)
Standard
Values (kΩ)
Acceleration
(Hz/s)
During Open During Open
Loop
(DMD = HI)
ACC
Code
Loop
(DMD = LO)
Frequency
(Hz)
(R2/R1+R2)
R1
R2
GND
0.322
0.644
0.966
1.288
1.610
1.932
2.254
VREF
n/a
0
1
2
3
4
5
6
7
8
n/a
90.9
34.8
102
9.09
9.09
11.5
2.8
n/a
11.5
10
3.1
5.1
6
6
6
6
6
6
6
6
2
3
3
3
3
3
3
3
3
1
500
500
500
500
500
500
500
500
1000
0.112
0.223
0.335
0.446
0.558
0.669
0.781
n/a
7
51.1
11.5
11.5
23.2
10
9
10.9
14.8
18.8
26.6
26.6
n/a
n/a
Note: ACC Target voltages based on VREF of 2.885 V
7
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
APPLICATION INFORMATION
Ground
Plane
VREF
100 Hz - 100 kHz PWM IN
10% - 100% duty
PWM
FG
ACC
DMD
VREF
OUTC
GND
CVREF
RPU
RPWM
FG Output
Signal
D1
12 V IN
VBB
To Motor Terminal
OUTA
OUTB
CVBB
ZD1
Ground
Plane
Figure 5: Typical Application Circuit
Name
Suggested Value Comment
0.1 µF, X5R, 10 V Ceramic capacitor required
CVREF
CVBB
RFG
4.7 to 47 µF
10 kΩ
Power Supply Stabilization – Electrolytic or ceramic OK.
Optional – pullup resistor for speed feedback
D1
Not Installed
May be required to isolate motor from system or for reverse
polarity protection
ZD1
SMBJ14A
Optional TVS to limit maximum VBB due to transients due to
motor generation or power line. Suggested to clamp below
18 V (EX: Fairchild SMBJ14A). Typically required if blocking
diode D1 is used.
RPWM
1 kΩ
Optional – If PWM wired to connector – RPWM will isolate IC pin
from noise or overvoltage transients.
Layout Notes
1. Add thermal vias to exposed pad area.
2. Add ground plane on top and bottom of PCB.
3. Place CVREF and CVBB as close as possible to IC , connected to GND plane.
8
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
PIN DIAGRAMS
VBB
OUTA
OUTB
OUTC
VBB
VBB
21 V
VBB
7.5 kΩ
PWM
DMD
VREF
FG
6.5 V
6.5 V
21 V
9
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Package LK, 10-Lead eSOIC
with Exposed Pad
0.55
1.00
+0.08
–0.10
10
4.90
8º
0º
10
1.75
0.25
0.19
B
5.60
2.41
+0.08
–0.10
3.91
2.41 ±0.25
6.00 ±0.20
A
1
0.685 ±0.20
0.25 BSC
2
1
2
3.30 ±0.25
Branded Face
3.30
SEATING PLANE
GAUGE PLANE
C
10X
PCB Layout Reference View
SEATING
PLANE
C
0.10
C
0.40
0.30
For Reference Only; not for tooling use
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
1.55 ±0.10
1.00 BSC
Exact case and lead configuration at supplier discretion within limits shown
0.10 ±0.05
Terminal #1 mark area
A
B
C
Exposed thermal pad (bottom surface)
Reference land pattern layout; all pads a minimum of 0.20 mm from all
adjacent pads; adjust as necessary to meet application process
requirements and PCB layout tolerances; when mounting on a multilayer
PCB, thermal vias at the exposed thermal pad land can improve thermal
dissipation (reference EIA/JEDEC Standard JESD51-5)
10
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Package LN, 10-Lead SSOP
4.90 ±0.20
0° to 8°
1.00
0.65
10
10
0.21 ±0.04
2.25
3.90 ±0.10 6.00 ±0.20
4.95
A
1.05 (REF)
1.27
0.40
1
2
2
1
Branded Face
PCB Layout Reference View
C
1.55 ±0.20
0.25
0.10
0.45
0.30
1.00
BSC
For Reference Only; not for tooling use
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A
B
C
Terminal #1 mark area
Branding scale and appearance at supplier discretion
Reference land pattern layout. All pads a minimum of 0.20 mm from all
adjacent pads; adjust as necessary to meet application process
requirements and PCB layout tolerances; when mounting on a multilayer
PCB, thermal vias near the pin lands can improve thermal dissipation
(reference EIA/JEDEC Standard JESD51-7)
11
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
A5936
Three Phase Sensorless Sinusoidal Fan Driver
Revision History
Number
Date
Description
–
1
2
3
February 13, 2017
June 26, 2017
July 5, 2018
Initial release
Corrected typo in Figure 1
Minor editorial updates
Minor editorial updates
July 15, 2019
Copyright 2019, Allegro MicroSystems.
Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor
for any infringement of patents or other rights of third parties which may result from its use.
Copies of this document are considered uncontrolled documents.
For the latest version of this document, visit our website:
www.allegromicro.com
12
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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