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PDF AM4961A Data sheet ( Hoja de datos )
| Número de pieza | AM4961A | |
| Descripción | SINGLE PHASE FULL WAVE PWM MOTOR DRIVER | |
| Fabricantes | Diodes | |
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A Product Line of
Diodes Incorporated
AM4961A
SINGLE PHASE FULL WAVE PWM MOTOR DRIVER
Description
The AM4961A is highly integrated feature rich single phase Brushless
Direct Current (BLDC) full wave motor driver with PWM control
function for fans, blowers and extractors.
For system flexibility the motor speed can be controlled by either an
external PWM signal or by a DC voltage or from a Thermistor
network. Based on the input signal, the AM4961A adjust the output
duty cycle.
To help protect the motor coil, the AM4961A provides a rotor lock
protection which shuts down the output if rotor lock is detected. The
device automatically re-starts when the rotor lock is removed.
To help interface to external system for monitoring the motor status
and speed, AM4961A provides open drain Rotor lock detect alarm
output (RD) pin and a tachometer output Frequency Generator (FG).
The FG output is the magnetic change frequency.
The AM4961A is available in SSOP-16 and HTSSOP-14 packages.
Features
• Operating voltage : 3.5V to 16V
• Internal H-Bridge with 1A Peak Current Capability
• Speed Control with external PWM, DC or Thermistor signals
• Minimal Speed Setting
• Built-in Hall Bias Circuit
• Reference Voltage Output
• Rotor Lock Protection with Output Shutdown and Auto Restart
• Rotation Speed Indication (FG)
• Rotation or Lock State Indication (RD)
• Built-in Thermal Shutdown Circuit
• Industry standard SSOP-16 and Thermally Enhanced
HTSSOP-14 Packages
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
OUT2 1
16 PGND
NC 2
15 OUT1
VCC 3
14 GND
VMIN 4
13 CT
VPWM 5
12 VREF
COSC 6
11 HIN-
FG 7
RD 8
10 HB
9 HIN+
SSOP-16 (GS Package)
(Top View)
PGND
PGND
OUT2
VCC
VMIN
VPWM
1
2
3
4
COSC
FG
RD
5
6
7
14 OUT1
13 GND
12 CT
11 VREF
10 HIN-
9 HB
8 HIN+
HTSSOP-14 (GH Package)
Applications
• 12V BLDC Cooling Fans, Motors, Extractors and Blowers
• CPU Cooler Fan in PC
• Instrumentation and Equipment Cooling fans
• Brushless DC Motor Driver
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AM4961A
Document number: DS36626 Rev. 1 - 2
1 of 17
www.diodes.com
October 2013
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
AM4961A
Electrical Characteristics (@VCC=12V, TA=25°C, unless otherwise specified.)
Symbol
I Q1
I Q2
V REF
V SATH
V SATL
f OSC
V OSCH
V OSCL
V HYS
V HB
V CTH
V CTL
I CHG
I DHG
R CD
V FGL
I LFG
V RDL
I LRD
Parameter
Quiescent Current
VREF Voltage
Output Saturation Voltage at High Side
Output Saturation Voltage at Low Side
COSC Frequency
COSC High Level Voltage
COSC Low Level Voltage
Hall Input Hysteresis
Hall Bias Voltage
CT High Level Voltage
CT Low Level Voltage
CT Charge Current
CT Discharge Current
CT Charge and Discharge Ratio
FG Output Low Level Voltage
FG Leakage Current
RD Output Low Level Voltage
RD Leakage Current
Conditions
Lock Off
Lock On
IREF = 5mA
ISOURCE = 200mA
ISINK = 200mA
COSC = 100pF
–
–
–
IHB = 5mA
–
–
–
–
I CHG /I DHG
IFG = 5mA
VFG = 12V
IRD = 5mA
VRD = 12V
Min
10.2
5.38
5.8
–
–
18
3.45
1.83
–
1.1
3.55
1.55
1.5
0.14
8.5
–
–
–
–
Typ
15
8
6
1.0
0.2
25
3.6
1.95
±10
1.25
3.7
1.7
2
0.2
10
0.3
–
0.3
–
Max
18.76
10.55
6.2
1.17
0.3
32
3.75
2.07
±20
1.4
3.88
1.85
2.85
0.285
14.5
0.4
30
0.4
30
Units
mA
V
V
V
kHz
V
V
mV
V
V
V
µA
µA
–
V
µA
V
µA
AM4961A
Document number: DS36626 Rev. 1 - 2
5 of 17
www.diodes.com
October 2013
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
AM4961A
Applications Note (cont.)
Minimum Speed Setting
The minimum speed setting prevents the motor speed dropping below a set speed when the speed demand is too low (i.e. VPWM voltage is
closer to 3.6V)
When the VPWM pin voltage higher than the VMIN voltage, VMIN voltage is compared to the COSC pin to generate output PWM duty.
Therefore, setting VMIN to certain fixed voltage forces the VMIN to control the speed even when the PWM voltage is higher.
The output PWM duty will be clamped to the PWM duty represented by the VMIN voltage when the speed demand is lower than the set
minimum.
If VMIN is not used or application does not need to set the minimum speed, connect the VMIN to VPWM directly. When the VMIN is connected
to the VPWM the minimum output PWM duty defaults to 10%.
Rotor Lock Detect and OFF time Setting
The capacitor C4 from CT pin to the ground provides the timing for the lock detect and auto-restart. The capacitor C4 is charges and
discharged by the CT pin at a fixed rate depending on the mode of operation (fan operation status) and therefore the value of the C4 to gives
lock-detect time (TLCKDET) and lock time (TOFF) before next auto-start retry.
The Am4961A returns the C4 voltage to the low threshold, VCTL (1.77V), each time the Hall sensor provides the commutation signal. C4 is
charged with ICHG which is typically 2µA. If the voltage on the C4 reaches the high threshold, VCTH (3.7V) before the next Hall signal change,
the output will be shutdown and the device will enter lock condition.
TLCKDET
=
C4 (VCTH − VCTL)
ICHG
The thresholds voltage and charge current are fixed, therefore the TLCKDET time depends only on the value of C4.
TLCKDET = C4 × 1 × 106
For C4 of 0.47µF, TLCKDET is 0.47s
If lock detection causes device to enter output shutdown, the CT pin will discharge the C4 capacitor with I DHG provide TOFF period. The TOFF is
the time the device waits before next auto-restart. During TOFF period, the C4 is discharged for the high threshold, VCTH to low threshold VCTL
at the discharge current IDHG which is typically 0.2µA.
TOFF
=
C4 (VCTH − VCTL)
IDHG
The thresholds voltage and discharge current are fixed, therefore the TOFF time depends only on the value of C4.
TOFF = C4 × 10 × 106
For CT of 0.4µs, TOFF is 4.7s before the next auto restart.
Thermal Shutdown
AM4961A includes a thermal shutdown function. When the device junction temperature is higher than 176 ºC typical, the thermal shutdown
function is triggered and the low side output transistors in H- bridge driver will be turned off. When the IC junction temperature drops below
148°C typical, the device will recover.
AM4961A
Document number: DS36626 Rev. 1 - 2
11 of 17
www.diodes.com
October 2013
© Diodes Incorporated
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AM4961A.PDF ] | |
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