AM4964 - Diodes Incorporated

A Product Line of
Diodes Incorporated
AM4964
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
Description
Pin Assignments
(Top View)
For system flexibility, the motor speed can be controlled by an
external PWM signal and temperature sensed by Thermal resister at
the same time. Based on external input PWM and temperature
signals, the AM4964 adjusts the output PWM duty cycle. If the input
PWM duty is constant, the output PWM duty varies with temperature
sensed by Thermal resister sensor between the low and high
temperature corners. If the temperature signal is constant, the output
duty varies with the external input PWM duty. The low and high
temperature corners and the output PWM duty gap between these
temperature corners are adjustable
NC
1
20
NC
PGND
2
19
OUT1
OUT2
3
18
TA
VCC
4
17
TH
VMIN
5
16
SGND
PWM
6
15
CT
CF
7
14
RADJ
FG
8
13
IN-
RT
9
12
HB
TL
10
11
IN+
To help protect the motor coil, the AM4964 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.
AM4964 provides a tachometer output Frequency Generator
(FG). The FG output is the magnetic change frequency.
The AM4964 is available in TSSOP-20EP package.
TSSOP-20EP
Features













Applications
Flexible Speed Control Options

Combined PWM+Thermistor Speed Control

PWM Speed Control

DC Voltage Speed Control
Adjustable Low and High Temperature Corners
Full Speed When Thermal Resistor is Shorted
Adjustable Output Duty Gap between High and Low
Temperature when 100% PWM Input
Built-in oscillator – No external capacitor
Built-in Minimal Speed Setup Circuit
Alpha Slope Adjustable
Rotation Speed Indicator (FG)
Built-in Temperature Control Circuit
Built-in Thermal Shutdown Circuit
Lock Protection and Auto-restart
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
EXPOSED PAD
NEW PRODUCT
The AM4964 is highly integrated feature rich single phase Brushless
Direct Current (BLDC) full wave motor driver with combined PWM and
temperature speed control function for fans, blowers and extractors.


CPU Cooler Fan in PC
Brushless DC Motor Driver
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.
AM4964
Document number: DS37241 Rev. 2 - 2
1 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Typical Applications Circuit
L1
D1
V+
C1
1F
PGND
OUT1
OUT2
TA
18
4
VCC
TH
17
SGND
16
6
7
R4
8
C3
1F
9
RT
D3
3
5
R3
20
19
R1
R2
NC
2
D2
VCC
NC
10
VMIN
PWM
CF
AM4964
NEW PRODUCT
1
R7
R9
V+
CT
C2 0.47F
15
RADJ
14
IN-
13
HB
12
IN+
11
FG
R5
R6
Hall
RT
TL
R8
AM4964
Document number: DS37241 Rev. 2 - 2
2 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
NEW PRODUCT
Pin Descriptions
Pin Number
Pin Name
1,20
NC
Not connected
2
PGND
Power ground
3
OUT2
Fan driver output2
4
VCC
Power supply
5
VMIN
Minimum speed setting pin
6
PWM
PWM pulse input terminal
7
CF
Filter capacitor
8
FG
FG signal output
9
RT
RT signal output
10
TL
Low temperature set resistor
11
IN+
Hall sensor input+
12
HB
Hall bias voltage
13
IN-
Hall sensor input-
14
RADJ
15
CT
16
SGND
17
TH
High temperature set resistor
18
TA
Output duty gap adjust pin between low and high temperature at 100% input duty
19
OUT1
Exposed pad
AM4964
Document number: DS37241 Rev. 2 - 2
Function
Output pulse duty/input pulse duty adjustable terminal
Lock protect and auto start
Signal ground
Fan driver output1
Central exposed pad – The central exposed pad is for thermal dissipation. On PCB layout, the
exposed pad can be connected to GND or remain unconnected to any other signals
3 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Block Diagram
V+
5
VMIN
V+
42k
V+
8
51k
NEW PRODUCT
Thermal
Shutdown
Triangle Wave
104k
14
RADJ
V+
6
PWM
Predriver
90k
17k
56k
18k
54k
4
7
CF
FG
93k
VCC
Control
Circuit
9
RT
V+
3
10
TL
OUT2
17
TH
Vreg
18
TA
19
Hysteresis Amp
11
IN +
13
IN -
OUT1
Lock Shutdown
and
Auto Restart
1.25V
12
15
HB
2
16
CT
SGND
PGND
Truth Table
Items
IN-
IN+
1
H
L
CF
CT
OUT1
OUT2
FG
Mode
H
L
L
Rotation
L
H
Off
PWM Off
L
2
L
H
L
3
H
L
4
L
H
5
H
L
Off
L
L
Rotation Recirculation
L
Off
Off
PWM Off
H
Off
L
Off
H
Off
H
L
6
L
H
AM4964
Document number: DS37241 Rev. 2 - 2
H
Lock Protection
4 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
NEW PRODUCT
Symbol
Rating
Unit
VCC
Supply Voltage
18
V
IOUT
Output Current
1.0
A
VOUT
Output Voltage
18
V
VFG
FG Output Voltage
18
V
IFG
FG Output Current
10
mA
PD
Power Dissipation
1.1
W
-55 to +150
°C
Thermal Resistance (Junction to Ambient) (Note 5)
114
°C/W
ESD
ESD (Human Body Model)
3000
V
ESD
ESD (Machine Model)
300
V
TSTG
JA
Notes:
Parameter
Storage Temperature Range
4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability
5. TSSOP-20EP exposed pad is soldered to minimum recommended landing pads (see Package Outline Dimension section) on a 4.0mm x 3.0mm twolayer 2oz.copper FR4 PCB (1.6mm thickness) with four thermal vias in the exposed PAD to the copper flood on the bottom layer. See thermal de-rating
curves in the thermal performance section.
Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
3.5
12
16
V
VIN+
Hall Input Voltage +
0.2
–
3
V
VIN-
Hall Input Voltage -
0.2
–
3
V
TA
Ambient Temperature
-30
–
+90
°C
AM4964
Document number: DS37241 Rev. 2 - 2
5 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Electrical Characteristics
Symbol
(@VCC=12V, TA=+25°C, unless otherwise specified.)
Parameter
IQ1
Conditions
Min
Typ
Max
VCT=L
10.15
15
18.75
VCT=H
5.35
8
10.5
Quiescent Current
NEW PRODUCT
IQ2
Unit
mA
VSATH
Output Saturation Voltage at High
Side
ISOURCE=200mA
–
1.0
1.17
V
VSATL
Output Saturation Voltage at Low Side
ISINK=200mA
–
0.2
0.3
V
fPWM
CPWM Frequency
–
18
25
32
kHz
VCPWMH
CPWM High Level Voltage
–
3.40
–
3.8
V
VCPWML
CPWM Low Level Voltage
–
1.8
–
2.3
V
–
2.95
–
3.35
–
2.95
–
3.45
–
2.35
–
2.85
–
1.75
–
2.25
–
3.65
–
4.15
–
3.75
–
4.25
VCFH1
CF High Level Voltage
VCFH2
VCFL1
CF Low Level Voltage
VCFL2
VADJ1
RADJ Pin Voltage
VADJ2
V
V
V
VMIN
VMIN Voltage
–
2.48
–
3.22
V
VHB
Bias
–
1
–
1.5
V
VHYS
Hall Input Hysteresis
–
–
±10
±20
mV
VCTH
CT High Level Voltage
–
3.55
3.7
3.88
V
VCTL
CT Low Level Voltage
–
1.55
1.7
1.85
V
ICHG
CT Charge Current
–
1.15
2
3.55
µA
IDHG
CT Discharge Current
–
0.115
0.2
0.355
µA
RCD
CT Charge and Discharge Ratio
ICHG/IDHG
8.5
10
14.5
–
VFGL
FG Output Low Level Voltage
IFG=5mA
–
0.2
0.3
V
ILFG
FG Leakage Current
VFG=7V
–
–
30
µA
AM4964
Document number: DS37241 Rev. 2 - 2
6 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Descriptions
HB – Hall Bias Output
This is a 1.25V nominal voltage source to bias a differential un-buffered Hall element sensor. If a Hall element requires a lower voltage than the
H-Bias output, connect an appropriate value resistor between the HB pin and the Hall element supply pin.
PWM – Pulse Width Modulate Signal Input Pin
The PWM signal is applied at this pin and then be translated to be stable voltage to control the motors rotate speed.
TL – Low Temperature Corner Set Pin
A resistor (R8) is connected between TL and ground to adjust the low corner temperature.
40
38
o
Low Corner Temperature ( C)
NEW PRODUCT
IN+ and IN- – Hall Inputs
The rotor position is detected by a Hall sensor, with the output applied to the IN+ and IN- pins. This sensor can be either a 4 pin 'naked' Hall
device or of the 3-pin buffered switching type. For a 4-pin device the differential Hall output signal is connected to the IN+ and IN-pins. For a
buffered Hall sensor the Hall device output is attached to the IN+ pin, with a pull-up attached if needed, whilst the IN- pin has an external
potential divider attached to hold the pin at half VREF. When IN+ is high in relation to IN-, OUT2 is the active drive.
RT=TSM2A103F39H1RZ
36
34
32
30
28
26
24
5
6
7
8
9
10
R8 (k)
Low Temperature Corner Value vs. R8 Resistor Value
AM4964
Document number: DS37241 Rev. 2 - 2
7 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Descriptions (cont.)
TH – High Temperature Corner Set Pin
A resistor (R9) is connected between TH and ground to adjust the high corner temperature.
High corner temperature can be estimated by: TH=TL+5*R9/100.
Input Duty Cycle=100%
40
o
NEW PRODUCT
High Corner Temperature ( C)
42
38
36
34
32
40
60
80
100
120
140
160
180
200
220
240
R9 (k)
High Temperature Corner vs. R9
TA – Output Duty Gap Adjust between High and Low Temperature Corners When Input Duty is 100%
A resistor (R7) is connected between TA and ground to adjust the output PWM duty gap between high temperature and low temperature corners
when the external input PWM duty is 100%.
100
Output Duty Cycle (%)
80
60
40
20
Low Temperature
High Temperature
The Gap Between Low and High Temperature
0
0
100
200
300
400
500
600
700
800
900
1000
R7 (K)
Output PWM Duty vs. R7
AM4964
Document number: DS37241 Rev. 2 - 2
8 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Descriptions (cont.)
CF –CF Capacitor Pin
A capacitor is connected to this pin as a filter to translate PWM signal to be stable voltage. The resistors R3 and R4 are connected to CF pin to
adjust the maximum speed at high temperature and low temperature corners.
100
100
R3=360K
R3=1M
R3 open
R4=150K
R4=390K
R4 open
80
Output Duty (%)
Output Duty (%)
80
60
40
60
40
20
20
0
0
0
20
40
60
80
0
100
20
40
60
80
100
Input Duty (%)
Input Duty (%)
Output PWM Duty vs. R3 and R4 at Low Temperature
Adjust the maximum speed vs. input PWM duty to approximately match the target specification using R3 and R4 at high temperature (T>TH,
V8>V7+0.7V).
100
100
R3=360K
R3=1M
R3 open
R4=150K
R4=390K
R4 open
80
Output Duty (%)
80
Output Duty (%)
NEW PRODUCT
Adjust the maximum speed vs. input duty to approximately match the target specification using R3 and R4 at low temperature (T<TL, V8<V7);
Measure the fan rotating speed vs. input duty. And draw a curve figure accordingly (Step=5%).
60
40
60
40
20
20
0
0
0
20
40
60
80
0
100
20
40
60
80
100
Input Duty (%)
Input Duty (%)
Output PWM Duty vs. R3 and R4 at High Temperature
AM4964
Document number: DS37241 Rev. 2 - 2
9 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Descriptions (cont.)
RADJ – Adjust the Line Slope of the Input PWM Duty vs. Output PWM Duty at the OUT1 and OUT2
Adjust Slope K of the fan rotating speed（or output duty）vs. input duty to approximately match the target specification using R5 and R6.
100
100
R5=100K
R5=270K
R5 is open
R6=100K
R6=270K
R6 open
80
Output Duty (%)
Output Duty Cycle (%)
60
40
60
40
20
20
0
0
0
10
20
30
40
50
60
70
80
90
0
100
20
40
60
80
100
Input Duty (%)
Input Duty (%)
Output PWM Duty Slope K vs. Input PWM Duty with Slope K R5 and R6
VMIN – Minimum Speed Setting
A voltage can be set on this pin via a potential divider between the VREF (or Supply) and GND pins. This voltage is monitored by the PWM pin
to clamp the PWM control voltage so that it does not rise above VMIN voltage. As a higher voltage on the PWM pin represents a lower speed,
the VMIN setting prevents the motor speed going lower than the minimum speed set by the VMIN pin. When the VMIN voltage is higher than the
lowest speed setting voltage allowed (The lowest speed voltage is about 0.28V CC), the fan speed is maintained at the lowest speed.
Adjust the minimum speed vs. input duty to approximately match the target specification via R2 (R1=15kΩ). Measure the fan rotating speed and
the input duty, as shown below.
100
80
Output Duty Cycle (%)
NEW PRODUCT
80
60
40
20
0
0
1
2
3
4
5
6
7
8
9
10
R2 (K)
Output PWM Duty vs. R2
AM4964
Document number: DS37241 Rev. 2 - 2
10 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Functional Descriptions (cont.)
CT – Locked Rotor Timing Capacitor
NEW PRODUCT
The CT pin will have a capacitor connected to ground. It is a multi-function pin providing timing for the lock detect and auto-restart. Different
rates of charge and discharge of CT capacitor depending on the mode of operation (fan operation status) give the lock-detect time (tLCKDET) and
lock time (tOFF) before the next auto-start retry. When the motor is running, the capacitor is discharged at every Hall signal change.
CT pin provides the timing for the Locked Rotor monitor. In normal operation, Lock Detect is enabled. If the Hall signal does not change (i.e. a
rotor lock condition) within the Lock Detect time (tLCKDET), the outputs are disabled. In this condition the motor will not be driven for a set time tOFF.
This tOFF time depends on the external CT capacitor value and its internal discharge current (I DHG). After the tOFF period device enters auto-restart
phase to re-start the motor with a new Lock Detect time. If the motor has not turned to generate a transition on the Hall inputs by the end of this
tLCKDET period, the motor re-enters motor lock tOFF period with the outputs disabled. If the Hall signal change is detected, the motor is deemed as
running and goes into lock-detection mode. The tLCKDET and tOFF are determined by the value of the external capacitor on the CT pin and the
internal charge and discharge currents during these time periods. The currents during tLCKDET and tOFF are ICHG, and IDHG respectively.
FG – Frequency Generator (Tachometer) Output Pin
This is the Frequency Generator output and is a buffered signal from the Hall sensor. This is an open collector drive giving an active pull down
with the high level being provided by an external pull up resistor.
OUT1 and OUT2 Pins
OUT1 and OUT2 pins provide H bridge driver output for fan and motor coil connection.
VCC – IC Supply voltage
This pin provides the supply for the device.
GND – Supply Return
This is the device supply ground return pin for control signal.
PGND –Power Supply Return
This is the device supply ground return pin for power output pins OUT1 and OUT2 and will generally be the most negative supply pin to the fan.
AM4964
Document number: DS37241 Rev. 2 - 2
11 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Performance Characteristics
Quiescent Current vs. Supply Voltage
Quiescent Current vs. Ambient Temperature
20
20
Quiescent Current (mA)
Quiescent Current (mA)
16
12
8
VCC=12V
IQ1 (VCT=L)
IQ2 (VCT=H)
16
12
8
4
4
0
0
0
5
10
15
20
25
-50
0
50
100
o
Ambient Temperature ( C)
Supply Voltage (V)
Output Saturation Voltage vs. Ouput Current
Allowable Power Dissipation vs. Allowable Temperature
(Note 6)
1.2
3.0
o
VCC=12V, TA=25 C
VSATH
VSATL
2.5
Allowable Power Dissipation (W)
Output Saturation Voltage (V)
NEW PRODUCT
o
TA=25 C
IQ1(VCT=L)
IQ2(VCT=H)
2.0
1.5
1.0
0.5
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
400
500
0.0
-20
0
20
40
60
80
90 100
o
Ambient Temperature ( C)
Output Current (mA)
Note 6: TSSOP-20EP exposed pad is soldered to minimum recommended landing pads (see Package Outline Dimension section) on a4.0mmx3.0mm two-layer
2oz.copper FR4 PCB (1.6mm thickness) with four thermal vias in the exposed PAD to the copper flood on the bottom layer.
AM4964
Document number: DS37241 Rev. 2 - 2
12 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Applications Note
Typical application circuit for PWM input signal for speed control with AM4964 is shown below. The speed is primarily controlled by a voltage on
the CF pin (either from DC voltage signal or PWM inputs signal converted to DC voltage).
NC
20
PGND
OUT1
19
3
OUT2
TA
18
4
VCC
TH
17
SGND
16
1
NC
2
D2
VCC
D1
note7
V+
C1
1F
R1
R2
R3
5
VMIN
6
PWM
7
R4
8
C3
1F
9
RT
10
CF
AM4964
NEW PRODUCT
L1
D3
R7
R9
V+
CT
C2 0.47F
15
RADJ
14
IN-
13
HB
12
IN+
11
FG
R5
R6
Hall
RT
TL
R8
Typical Application Circuit (External PWM Input Speed Control)
Note 7: C1 is for power stabilization and should be 1μF or higher depending on the motor current and motor design.
AM4964
Document number: DS37241 Rev. 2 - 2
13 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Applications Note (cont.)
Some of typical application performance curves based on circuits above are shown below (R1 to R6 open, R8=8kΩ, R9=150kΩ).
60
R7=390K
80
Output Duty (%)
Output Duty Gap(%)
40
Low Temperature
High Temperature
60
40
Low Temperature
High Temperature
20
20
0
0
0
20
40
60
80
0
100
20
40
60
80
100
Input Duty (%)
Input Duty (%)
Output PWM Duty vs. Input PWM Duty with R7 (180k)
Output PWM Duty vs. Input PWM Duty with R7 (390k)
TH
R5=470K , R7=150K ,
R8=8.52K , R9=130K
100
Input Duty
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
80
Output Duty (%)
NEW PRODUCT
Output Duty Gap
(Input Duty=100%)
R7=180k
80
Output Duty Gap
(Input Duty=100%)
100
100
60
TL
40
20
0
24
26
28
30
32
34
36
38
40
42
44
46
o
Temperature ( C)
Output PWM Duty vs. Temperature
AM4964
Document number: DS37241 Rev. 2 - 2
14 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Applications Note (cont.)
Power Supply Stabilization
The recommended operating voltage range for AM4964 is 3.5V to 16V. A decoupling capacitor C1 (which also acts as re-circulating capacitor at
commutation) should be connected close to the VCC pin. C1 is for power stabilization and should be 1μF or higher depending on the motor
current and motor design.
The HB pin provides a 1.25V Hall bias voltage to drive Hall element. The output of the Hall elements or the Hall switches is connected to Hall
input IN+ and IN- pin as described previously in functional description section. To avoid noise, the connection to the Hall element or switch
should be as short as possible. The Hall input stage (IN+ and IN- pin) has a hysteresis of 20mV typical. The differential Hall input signal should
be 50mV peak or higher.
Speed Control
The motor speed is governed by the output PWM duty of the H Bridge.
Speed Control
The motor speed is governed by the output PWM duty of the H Bridge.
M
NEW PRODUCT
Hall Bias and Hall Input for Commutation Signal
The voltage on the CF, VMIN pin and the internal triangle wave voltage controls the output PWM duty and therefore the speed of the motor.
When the CF voltage is smaller than VMIN voltage, the output PWM duty is generated by comparing the triangular voltage with CF. If the CF pin
voltage is higher than the VMIN pin, the speed is controlled by comparing the triangular voltage with VMIN voltage. When the PWM voltage is
lower than the low side of the triangular voltage, the motor will run at full speed. See “Speed Control and Minimum Speed Setting” figure.
An input DC voltage from 3.6V to 1.9V (for 12V supply) on the CF pin controls the output PWM duty from 0% to 100% thus allowing speed
control from 0% to 100% of the full speed. The DC voltage of CF can be adjusted by PWM input signal duty and the ambient temperature
sensed by the thermistor (resistive sensor) connected to RT pin.
AM4964
Document number: DS37241 Rev. 2 - 2
15 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Applications Note (cont.)
Adjustable Voltage
fPWM=25kHz
VH=3.6V
VMIN
NEW PRODUCT
VCF (T≤TL)
VL=2.0V
VCF (T≥TH)
Low Speed
PWM Variable
High Speed
FG Output(T≤TL)
FG Output(T≥TH)
All Parameters Are Tested under VCC=12V
Speed Control and Minimum Speed Setting
Minimum Speed Setting
The minimum speed setting prevents the motor speed dropping below a setting speed when the speed demand is too low (i.e. PWM voltage is
closer to 3.6V)
When the CF pin voltage is higher than the VMIN voltage, the VMIN voltage is compared with the internal triangular wave to generate the output
PWM duty. Therefore, setting the VMIN to certain fixed voltage forces the VMIN to control the speed even when the CF voltage is higher.
If VMIN setting is not used or application does not need to set the minimum speed, connect the VMIN to CF directly.
Rotor Lock Detect and OFF Tme 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 AM4964 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, V CTH (3.7V) before the next Hall signal change, the output will
be shut down and the device will enter lock condition.
CTH
C DET
CT
CHG
The thresholds voltage and charge current are fixed, therefore the tLCKDET time depends only on the value of C4.
C DET
For C4 of 0.47μF, tLCKDET is 0.47s.
AM4964
Document number: DS37241 Rev. 2 - 2
16 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Applications Note (cont.)
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, V CTH to low threshold VCTL at the
discharge current IDHG which is typically 0.2μA.
CTH
OFF
CT
CHG
NEW PRODUCT
The thresholds voltage and discharge current are fixed, therefore the tOFF time depends only on the value of C4.
OFF
For CT of 0.4μs, tOFF is 4.7s before the next auto restart.
Thermal Shutdown
AM4964 includes a thermal shutdown function. When the device junction temperature is higher than +176ºC 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 +148ºC
typical, the device will recover.
Status Output - FG Output
The FG output pin is an open collector output which switches ON (pulled low) and OFF (pulled high with an external resistor) depending on the
magnetic phase of the motor. The external pull up resistor should be connected to the FG pin.
The FG pin has series resistors of 25Ω typical integrated in the FG output structure to increased robustness against reverse supply connection of
the FG to ground. The typical value for external pull-up on FG is 10k.
AM4964
Document number: DS37241 Rev. 2 - 2
17 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Ordering Information
AM4964 X XX – XX
NEW PRODUCT
Product Name
Package
Packing
RoHS/Green
G : TSSOP-20EP
TR : Tape & Reel
G1 : Green
Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.
Package
Temperature Range
TSSOP-20EP
-30 to +90C
Part Number
AM4964GTR-G1
Marking ID
AM4964GG
Packing
4000/Tape & Reel
Marking Information
(Top View)
AM4964
GG
YWWAXX
AM4964
Document number: DS37241 Rev. 2 - 2
First and Second lines: Logo and Marking ID
Third Line: Date Code
Y: Year 0 to 9
WW: Week 00 to 52 (Work Week of Molding)
A: Assembly House Code
th
th
XX: 7 and 8 Digits: Batch No.
Part Number
Package
Marking ID
AM4964GTR-G1
TSSOP-20EP
AM4964GG
18 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Package Outline Dimensions (All dimensions in mm(inch).)
(1)
Package Type: TSSOP-20EP
4.100(0.161)
4.300(0.169)
2.900(0.114)
3.100(0.122)
6.200(0.244)
6.600(0.260)
EXPOSED PAD
4.300(0.169)
4.500(0.177)
0.000(0.000)
0.750(0.030)
INDEXФ 0.850(0.033) Dp 0.100(0.004)
#1 PIN
NEW PRODUCT
6.400(0.252)
6.600(0.260)
0.100(0.004)
0.190(0.007)
0.650(0.026)TYP
0.800(0.031)
1.050(0.041)
0.340(0.013)
0.540(0.021)
4-10°
14°
TOP & BOTTOM
0.200(0.008)MIN
R0.090(0.004)MIN
1.200(0.047)
MAX
0.050(0.002) R0.090(0.004)MIN
0.150(0.006)
0.250(0.010)TYP
0°
8°
0.200(0.008)
0.280(0.011)
0.450(0.018)
0.750(0.030)
1.000(0.039)
REF
Note: Eject hole, oriented hole and mold mark is optional.
AM4964
Document number: DS37241 Rev. 2 - 2
19 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
Suggested Pad Layout
(1)
Package Type: TSSOP-20EP
NEW PRODUCT
X1
G
Y1
Z
Y
E
X
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
Value
7.720/0.304
4.160/0.164
0.420/0.017
1.780/0.070
Dimensions
E
(mm)/(inch)
X1
(mm)/(inch)
Y1
(mm)/(inch)
–
Value
0.650/0.026
4.500/0.177
3.300/0.130
–
AM4964
Document number: DS37241 Rev. 2 - 2
20 of 21
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AM4964
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
NEW PRODUCT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall
assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes
Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify
and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly
or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and
markings noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems,
and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systemsrelated information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and
its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or
systems.
Copyright © 2014, Diodes Incorporated
www.diodes.com
AM4964
Document number: DS37241 Rev. 2 - 2
21 of 21
www.diodes.com
June 2014
© Diodes Incorporated