[AP1034]
AP1034
Stepper Motor Driver IC equipped with Active Decay Control
1. General Description
The AP1034 is driver for bipolar stepper motors. It supports 35V motor power supply and 2.0A constant
current operation. The AP1034 can automatically control Decay setting (slow, fast, pre-fast) in the IC inside
by AKM original "Active Decay Control". The AP1034 can achieve optimal current setting, therefore will
reduce current ripple and bring the motor rotation operation of the high efficiency. The input interface is
clock-in method and supports from 2 Phase (full step) to 2W1-2 Phase (1/8step) excitation. In addition, the
AP1034 is built-in a regulator for control circuit and capable of driving a motor only by motor power supply
voltage (VM), therefore can facilitate design for the application.
It is housed in a small QFN package with good heat dissipation performance, therefore the AP1034 is suitable
for the stepping motor drive in a space-saving and high current.
2. Features
Built-in PWM current control stepper motor driver
Single Power Supply Operation
Motor Operating Voltage
Max Output Current
On-Resistance (High+Low)
Input Interface
Excitation Mode
Selectable PWM chopper frequency
Spike Noise Blanking Function
Power Saving Function
Selectable Motor Rotation Direction
Corresponding to 3.3V/5V input signal
Built-in Charge Pump Circuit
Under Voltage Lockout Circuit(UVLO)
Thermal Shutdown Circuit (TSD)
Over Current Protection Circuit (OCP)
Operating Temperature Range
Package
-30 °C ~ +85°C
AP1034AER: 24-pin QFN (4.0mm□)
AP1034AEN: 32-pin QFN (5.0mm□)
AP1035AER, AP1035AEN : 1.0A
AP1037AER, AP1037AEN : 1.5A
MFP/LBP, Scanner, Robotics
ATM, Vending machines, Ticket machines,
Moneychangers, Point of Sales System (POS) devices
and etc.
Pin Compatible Lineups
Applications
016003455-E-01
Active Decay Control
Built-in Regulator for control circuit
8.0 ~ 35.0V
2.0A
0.64Ω(typ.) @Ta=25℃
Clock-in method
2 Phase (Full step)
1-2 Phase (1/2 step)
W1-2 Phase (1/4 step)
2W1-2 Phase (1/8 step)
39kHz/77kHz
Without an external noise filter
VM Power Consumption is less than10µA
(Ta=25°C)
Forward/Reverse
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2016/06
[AP1034]
3. Table of Contents
1.
2.
3.
4.
5.
6.
General Description ........................................................................................................................................... 1
Features .............................................................................................................................................................. 1
Table of Contents ............................................................................................................................................... 2
Block Diagram ................................................................................................................................................... 3
Ordering Guide .................................................................................................................................................. 3
Pin Configurations and Function ....................................................................................................................... 4
Pin Configurations...................................................................................................................................... 4
Functions .................................................................................................................................................... 5
7. Absolute Maximum Ratings .............................................................................................................................. 6
8. Recommended Operating Conditions ................................................................................................................ 7
9. Electrical Characteristics.................................................................................................................................... 7
10. Functional Descriptions ..................................................................................................................................... 9
10.1 Input and Output of Terminal ..................................................................................................................... 9
Truth Table ................................................................................................................................................. 9
ENABLEB : Output Enable Terminal....................................................................................................... 9
SLEEPB : Sleep Mode Setting Terminal ................................................................................................... 9
MODE1,MODE2 : Motor Excitation Mode Setting Terminal ................................................................. 10
STEP : Step Input Terminal ..................................................................................................................... 10
DIR : Motor Rotation Direction Setting Terminal .................................................................................. 11
RESETB : Home Position Setting Terminal ............................................................................................ 11
FS : PWM Chopper Frequency Select Terminal ...................................................................................... 12
10.2 PWM Constant Current Control ............................................................................................................... 12
Setting of the Output Current ................................................................................................................... 12
Mixed Decay Mode Current Waveform ................................................................................................... 13
Blanking Time .......................................................................................................................................... 13
Output Transistor Operating Mode .......................................................................................................... 13
10.3 Micro-Step Function ................................................................................................................................. 14
Step Sequence .......................................................................................................................................... 14
Example of Current Waveforms in Each Excitation Mode ...................................................................... 15
10.4 Protection Functions ................................................................................................................................. 17
Thermal Shutdown Circuit (TSD) ............................................................................................................ 17
Under Voltage Lock Output Circuit (UVLO) .......................................................................................... 17
Over Current Protection Circuit (OCP) .................................................................................................... 18
11. Recommended External Circuit ....................................................................................................................... 19
Recommended External Circuit ............................................................................................................... 19
Recommended Layout .............................................................................................................................. 20
12. Package ............................................................................................................................................................ 21
Outline Dimensions .................................................................................................................................. 21
Marking .................................................................................................................................................... 23
13. Revise History .................................................................................................................................................. 24
IMPORTANT NOTICE ..................................................................................................................................... 25
016003455-E-01
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2016/06
[AP1034]
4. Block Diagram
CHL
CH
CL
VM
NC
VG
Imt.VDC
Regulator
VDC
UVLO(VM)
CVDC
OSC
VM
Charge Pump
High-Side
Gate Drive
Low-Side
Gate Drive
Blank Time
CVG
VM
VM1
&
PWM Control
TSD
OCP
Active Decay Control
OUT1A
STEP
DIR
OUT1B
RESETB
RESET_B
M
Transltor
MODE1
IS1
MODE2
H-Bridge 1
FS
MCU
RR1
Control
Logic
VREF
1／8
RIS1
VM
Pre
Driver
VM2
DAC
RR2
IS1
CMP
1
IS2
CMP
2
OUT2A
OUT2B
ENABLE_B
ENABLEB
IS2
SLEEP_B
SLEEPB
H-Bridge 2
RIS2
Exposed Pad
GND
Figure 1. Block Diagram
5. Ordering Guide
AP1034AER
AP1034AEN
016003455-E-01
-30°C ~+85°C
-30°C ~+85°C
24-pin QFN
32-pin QFN
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2016/06
[AP1034]
6. Pin Configurations and Function
12
20
11
17
18
19
20
21
22
24
19
23
AP1034AEN : 32-pin QFN
13
14
15
16
17
18
Pin Configurations
AP1034AER: 24-pin QFN
25
16
26
15
27
AP1034AER
21
10
(Top View)
22
9
14
28
AP1034AEN
13
29
(Top View)
12
11
30
8
31
Exposed pad
7
016003455-E-01
-4-
10
8
7
6
5
4
3
9
1
32
6
5
4
3
2
1
24
Exposed pad
2
23
2016/06
[AP1034]
Functions
Pin Number
24QFN
32QFN
1
1
Pin Name
I/O
OUT2B
O
ENABLEB
I
2
5
GND
CL
CH
VG
P
I
I
O
3,16
4
5
6
6,19
7
8
9
VDC
O
7
10
MODE1
I
8
11
MODE2
I
9
12
RESETB
I
10
13
FS
I
11
14
SLEEPB
I
12
15
STEP
I
14
17
VREF
I
15
18
DIR
I
17
20
OUT1B
O
18
24
VM1
P
19
22
IS1
OUT1A
OUT2A
IS2
I
O
O
I
20
21
22
23
25
27
30
32
VM2
P
24
3
13
2,4,16,2
1,23,26,
28,29,31
NC
-
Function
H-bridge 2 Output Terminal
Output Enable Terminal
Please refer to Section10.1.
Ground Terminal
Connect Terminal for Charge Pump Capacitor
Connect Terminal for Charge Pump Capacitor
Connect Terminal for Stabilizing Capacitor
Internal Regulator 4.5V Output Terminal
Motor Excitation Mode Setting Terminal
Please refer to Section10.1.
Motor Excitation Mode Setting Terminal
Please refer to Section10.1.
Reset Input Terminal
Please refer to Section10.1.
Chopper Frequency Select Terminal
Please refer to Section10.1.
Sleep Mode Input Terminal
Please refer to Section10.1.
Step Input Terminal
Please refer to Section10.1.
Input Terminal of Reference Voltage of PWM
Constant Current Control
Motor Rotate Direction Setting Terminal
Please refer to Section10.1.
H-bridge1 Output Terminal
H-bridge1 Power Supply Terminal
Please connect VM2 terminal in the system
board.
H-bridge1 Current Sense Terminal
H-bridge1 Output Terminal
H-bridge2 Output Terminal
H-bridge2 Current Sense Terminal
H-bridge2 Power Supply Terminal
Please connect VM1 terminal in the system
board.
-
016003455-E-01
-
Not connect external
node
Built-in 100kΩ
pull-down
Built-in 50kΩ
pull-down
Built-in 100kΩ
pull-down
Built-in 100kΩ
pull-down
Built-in 100kΩ
pull-down
No Connection Terminal
Ground Terminal
Please connect GND terminal in the system
board.
Note 1. I (Input terminal), O (Output terminal), P (Power terminal)
Exposed
Pad
Note
-
-5-
For heat dissipation
2016/06
[AP1034]
7. Absolute Maximum Ratings
Parameter
Motor Power Supply Voltage
Digital Input/Output Terminal Voltage
(STEP, DIR, RESETB, MODE1,
MODE2, ENABLEB, SLEEPB, FS)
VM Level Terminal Voltage
(OUT1A,OUT1B, OUT2A,OUT2B)
Symbol
min
max
Unit
VM
-0.5
35
V
Vterm1
-0.5
5.5
V
Vterm2
-0.5
VM
V
Condition
The Min value must not
VM
VM
V
-0.5
+5.5
exceed -0.5V.
VDC
-0.4
5.5
V
VDC Terminal Voltage
VREF Input Voltage
VREF
-0.5
VDC
V
VCL
-0.5
VDC
V
CL Terminal Voltage
ISn
-0.5
1.5
V
IS1,IS2 Terminal Voltage
Output Current
Iload
2.5
A
(Note 3, Note 4)
3.9
W
Ta=25°C (Note 4, Note 5)
32QFN
PD1
2.0
W
Ta=85°C (Note 4, Note 5)
Power Dissipation
3.1
W
Ta=25°C (Note 4, Note 5)
24QFN
PD2
1.6
W
Ta=85°C (Note 4, Note 5)
Junction Temperature
Tj
150
°C
Storage Temperature
Tstg
-40
150
°C
Note 2. All above voltages are with respect to GND. The each power supply of VC and VM is sequence-free.
Note 3. For Power Dissipation, the output current rating may be limited by duty cycle, Ta, and PCB board heat
sinking design.
Note 4. Exposed Pad must be connected to GND.
Note 5. A 4-layer JEDEC51 compliant board is used.
If the temperature exceeds 25°C, be sure to derate at Figure 2.
24-pin QFN: RθJA =40°C /W
32-pin QFN: RθJA =32°C /W
VG,CH Terminal Voltage
Vterm3
WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal
operation is not guaranteed at these extremes.
4.5
4.0
Power dissipation, Pd ( W)
3.5
3.0
32QFN
RθJA=32°C/W at 4-layer PCB
2.5
2.0
24QFN
1.5
RθJA=40°C/W at 4-layer PCB
1.0
0.5
0.0
-30 -25
0
25
50
75 85 100
Temperature (°C)
125
150
175
Figure 2. Maximum Power Dissipation
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[AP1034]
8. Recommended Operating Conditions
Parameter
Symbol
min
typ
max Unit
Note
Motor Power Supply Voltage
VM
8.0
24.0
35.0
V
Maximum Output Current
Iload
2.0
A
(Note 6)
(Continuous)
Reference Voltage of
VREF
0.0
3.6
V
Iload(100%)[A]=(VREF/8)/RISn
PWM Constant Current Control
Operating Temperature Range
Ta
-30
85
°C
Note 6. Please have a thermal design so as not exceed Tj = 150 degrees and Power Dissipation.
Note 7. All voltages are with respect defined to GND (Exposed-Pad).
9. Electrical Characteristics
Parameter
Symbol
(Ta = 25°C, VM=24V, unless otherwise specified.)
Condition
min
typ
max
Unit
Quiescent Current
VM Quiescent Current
IVM
ENABLEB=”L”
-
-
12.0
mA
IVMOFF
ENABLEB=”L”
SLEEPB=”H”
-
-
7.0
mA
IVMPSV
SLEEPB=”L”
SLEEP MODE
-
10
30
µA
H-bridge Circuit
Driver On Resistance
RON
Iload = 1.5A
-
0.64
0.86
Ω
Body Diode Forward Voltage
VF
IF = 0.1A
-
0.8
1.2
V
Interface
Input High Level Voltage
VIH
2.0
-
-
V
Input Low Level Voltage
VIL
-
-
0.8
V
0.2
0.4
Input Hysteresis
(Note 9)
Vhys
STEP, DIR, RESETB,
MODE1,MODE2,ENABLEB
V
Input Pulse Rise Time
tR
-
-
1.0
µs
Input Pulse Fall Time
tF
-
-
1.0
µs
Input High Level Current
IIH
STEP,DIR, ENABLEB
5.5V applying
-
-
1.0
µA
Input Low Level Current
IIL
0V applying
-1.0
-
-
µA
0
-
3.6
V
-3
-
3
µA
Reference Voltage
VREF Input Voltage Range
VREF
VREF Input Current
IVREF
016003455-E-01
VREF=2V
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2016/06
[AP1034]
Parameter
(Ta = 25°C, VM=24V, unless otherwise specified.)
Condition
min
typ
max
Unit
Symbol
Current Operation
Blanking Time
PWM Chopper Frequency
Output Current Accuracy
tB
FS=”L”
1.3
2.6
5.2
µs
fCP1
FS=”L”
20
39
60
kHz
fCP2
FS=”H”
40
77
120
kHz
VREF=2V, %IloadMAX=38%
-15
-
±15
%
VREF=2V, %IloadMAX=71%
-5
-
±5
%
VREF=2V, %IloadMAX=100%
-5
-
±5
%
errIload
Protection Circuit
Overcurrent protection trip level
IOCPTRIP
2.5
5.0
7.5
A
Overcurrent protection deglitch
time
tOCPDET
3.0
6.8
23.3
µs
Overcurrent protection deglitch
voltage (Low side)
VLOCPTRIP
0.5
-
1.1
V
Under Voltage Detect Voltage
(UVLO)
VMUVLO
5.7
6.35
7.0
V
Thermal Shut Down Temperature
TTSD
(Note 9)
150
175
200
°C
TTSDHYS
(Note 9)
20
30
40
°C
Symbol
min
typ
max
Unit
STEP Signal “H” Level Time
tWH(STEP)
1.0
-
-
µs
STEP Signal “L” Level Time
tWL(STEP)
1.0
-
-
µs
DIR, MODEx Signal Setup Time
tS(STEP)
200
-
-
ns
DIR, MODEx Signal Hold Time
tH(STEP)
200
-
-
ns
Temperature Hysteresis
Note 8. All above voltages are with respect to GND.
Note 9. Not tested in production.
(Ta = 25°C, VM=24V, unless otherwise specified.)
Parameter
tWH(STEP)
tWL(STEP)
STEP
tS(STEP)
tH(STEP)
DIR,MODE1,MODE2
Figure 3. Timing Chart
016003455-E-01
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[AP1034]
10. Functional Descriptions
10.1 Input and Output of Terminal
Truth Table
Table 1. Output state against SLEEPB and ENABLEB settings
OUT1A
OUT1B
SLEEPB
ENABLEB
Condition
OUT2A
OUT2B
Output OFF
Output OFF Sleep mode
L
X
(Hi-Z)
(Hi-Z)
Internal control circuit : OFF
Output OFF
Output OFF Disable mode
H
H
(Hi-Z)
(Hi-Z)
Internal control circuit : ON
Enable mode
H
L
Output On
Output On
DIR=”H” : CW
DIR=”L” : CCW
Note 10. X : Don’t Care
ENABLEB : Output Enable Terminal
When the input is “H”, this pin turns off all the H-bridge outputs (motor output becomes Hi-Z). When the input
is “L”, all H-bridge outputs become enable. At that time, the input of sequencer (STEP,DIR,MODE1,MODE2)
is independent of the logic of enable. ENABLEB input is the function of making H-Bridge output off. During
output is off, the input of sequencer (STEP,DIR,MODE1,MODE2) is hold. Refer to Figure 4.
Table 2. Settings of output enable terminal
ENABLEB
L
H
Condition
Operating mode
Output Hi-Z (Electrical angle hold)
SLEEPB : Sleep Mode Setting Terminal
When the input is “L”, this pin sets the IC in sleep mode, and turns off all the H-bridge outputs, internal
regulator, and charge pump circuit (motor output becomes Hi-Z). Control circuit is reset. If the “H” is input,
the sleep mode is canceled. After the sleep mode is canceled, it restarts from the home position (Table 9).
STEP input cannot be input during 3msec(max) after the sleep mode is canceled, to wait for the stable
operation of internal charge pump. Refer to Figure 5. Please input “L” to SLEEPB terminal when turning on
power.
Table 3. Settings of sleep mode terminal
SLEEPB
L
H
016003455-E-01
Condition
SLEEP mode (Output : Hi-Z)
Operating mode
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2016/06
[AP1034]
Max3.0ms
STEP
STEP
IOUT1
0%
IOUT2
0%
IOUT1
0%
IOUT2
0%
SLEEPB
ENABLEB
ENABLEB
RESETB
Figure 4. ENABLEB signal Timing Chart
(W1-2 phase)
Figure 5. Sleep Mode Cancel Timing Chart
(W1-2 phase)
MODE1,MODE2 : Motor Excitation Mode Setting Terminal
The MODE1 and MODE2 terminals are used to configure stepping format as shown below.
Table 4. Settings of MODE terminals that excite motor
MODE1
MODE2
L
L
H
L
L
H
H
H
Excitation mode
2 phase (Full step)
1-2 phase (1/2step)
W1-2 phase (1/4step)
2W1-2phase (1/8step)
STEP : Step Input Terminal
The sequencer operates at the rising edge of the STEP input, electrical angle will proceed one at each step.
Please design the pattern such that there is no jump of noise in STEP input terminal.
Table 5. Step excitation state against STEP input
STEP
Rising Edge
Falling Edge
016003455-E-01
Condition
Sends excitation step
Hold excitation step
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2016/06
[AP1034]
DIR : Motor Rotation Direction Setting Terminal
This pin sets the direction of motor rotation. When changing the direction, a new setting is reflected on a rising
edge of the CLK pin. Refer to Figure 6.
・CCW : H-bridge2 current is output by shifting 90deree ahead against the H-bridge1 current.
・CW : H-bridge2 current is output by shifting 90degree behind against the H-bridge1 current.
Table 6. Settings of rotate direction of motor
DIR
L
H
Condition
CCW (Reverse)
CW (Forward)
RESETB : Home Position Setting Terminal
When the RESETB input is “H”, the sequencer is set at home position, and all the H-bridge outputs become off
(motor output becomes Hi-Z). In this case, STEP input is ignored until “H” is input to the RESETB terminal.
The internal circuits are in enable state. Refer to Figure 7.
Table 7. Settings of home position terminal
RESETB
L
H
Condition
Output : Hi-Z (Home Position)
Operating mode
STEP
STEP
IOUT1
0%
IOUT2
0%
IOUT1
0%
IOUT2
0%
DIR
RESETB
CW
CCW
Figure 6. DIR signal Timing Chart
(W1-2 phase)
016003455-E-01
CW
Figure 7. RESETB signal Timing Chart
(W1-2 phase)
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2016/06
[AP1034]
FS : PWM Chopper Frequency Select Terminal
By inputting “H” to the FS input, it is possible to drive the PWM chopper frequency in 77kHz (typ). By
inputting “L” or connecting GND, PWM chopper frequency becomes 39kHz (typ).
Please decide the setting of the FS input “50us” before than the ENABLEB input is set to "L".
Table 8. Settings of PWM chopper frequency select terminal
FS
Condition
L
fCP=39kHz(typ)
H
fCP=77kHz(typ)
10.2 PWM Constant Current Control
Setting of the Output Current
The frequency of the internal OSC circuit is used to drive a stepper motor in PWM constant current controlling.
The maximum current value (Setting Current = Trip Current) is determined by a sense resistance (RIS) for
sensing current and the input voltage to the VREF pin (VREF).
Iload (100%) [A]= (VREF /8) / RIS
VREF : PWM constant current setting voltage
RIS : H-Bridge sense resistor
VREF damping ratio : 1/8
Calculation example1：VREF=2.5V, RIS=0.2ohm
Iload (100%)[A] = (2.5 / 8) / 0.2ohm = 1.56A
In the figure below, area shaded in gray is the range of recommended sense resistance value.
Figure 8. Recommended Sense Resistor
016003455-E-01
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[AP1034]
Active Decay Mode Current Waveform
The AP1034 selects the decay mode automatically for better current follower performance. Usually, it
operates in slow decay mode but changes to fast decay mode when switching the step during current
decreasing period.
Also There is Pre fast decay mode before Charge mode. Therefore if in the low target current, it is possible to
reduce the current distortion.
①
①
②
③
④
②
③
①
②
③①
②
③① ④
② ③①
②
③①
②
③
Charge
Slow decay
Pre fast decay
Fast decay
Iload (100%)
Mottor Current
Chopper Frequency(fCP)
Blanking Time (tB)
Figure 9. Active Decay Mode Current Waveform
Blanking Time
Recovery current of parasitic diode arises when the decay mode changes charge mode during PWM constant
current operation. It can flow into current sense resistor, and the noise of current sense terminal (IS1,IS2)
cause the malfunction of internal comparator (CMP1,CMP2) . To prevent malfunction, the detection of
current sense comparator is blanking during Charge mode. The blanking time of the IC is 2.6us fixed at FS=L,
1.3us fixed at FS=H.
Output Transistor Operating Mode
● Charge mode
● Slow decay mode
● Pre Fast decay mode
● Fast decay mode
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
ON
ON
OFF
ON
OFF
Figure 10. Current Flow of Mixed Decay Mode
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[AP1034]
10.3 Micro-Step Function
Step Sequence
Table 9. Setting Current Comparison of Excitation Modes
2 phase
(Full step)
1-2 phase
(1/2step)
W1-2 phase
(1/4step)
1
1
2W1-2 phase
(1/8step)
Phase1
Current
[%Iloadmax]
100
98
92
83
71
56
38
20
0
-20
-38
-56
-71
-83
-92
-98
-100
-98
-92
-83
-71
-56
-38
-20
0
20
38
56
71
83
92
98
Phase2
Current
[%Iloadmax]
0
20
38
56
71
83
92
98
100
98
92
83
71
56
38
20
0
-20
-38
-56
-71
-83
-92
-98
-100
-98
-92
-83
-71
-56
-38
-20
Step Angle
[°]
1
0.00
2
11.25
2
3
22.50
4
33.75
1
2
3
5
45.00
6
56.25
4
7
67.50
8
78.75
3
5
9
90.00
10
101.25
6
11
112.50
12
123.75
2
4
7
13
135.00
14
146.25
8
15
157.50
16
168.75
5
9
17
180.00
18
191.25
10
19
202.50
20
213.75
3
6
11
21
225.00
22
236.25
12
23
247.50
24
258.75
7
13
25
270.00
26
281.25
14
27
292.50
28
303.75
4
8
15
29
315.00
30
326.25
16
31
337.50
32
348.75
: Home micro-step position at Step Angle 45°
Note 11. When the excitation mode is changed to a coarser mode, it is set to the closest position in the rotate
direction set by DIR signal. However, the motor could step-out or misstep depends on the operation state of
motor during switching time. The changing sequence of the excitation mode should be determined by adequate
evaluation.
Table 10. When changing to 2phase excitation mode at eighth position from 2W1-2phase excitation mode
Before
After
DIR
2W1-2
2phase(4step)
H
8step position
2step position
L
8step position
1step position
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Example of Current Waveforms in Each Excitation Mode
STEP
STEP
+100%
+100%
+71%
+71%
IOUT1A 0%
IOUT1A 0%
-71%
-71%
-100%
-100%
+100%
+100%
+71%
+71%
IOUT2A 0%
IOUT2A 0%
-71%
-71%
-100%
-100%
: Home position
: Home position
2 phase (CW mode：DIR=”H”)
1-2 phase (CW mode：DIR=”H”)
STEP
+100%
+92%
+71%
+38%
IOUT1A
0%
-38%
-71%
-92%
-100%
+100%
+92%
+71%
+38%
IOUT2A
0%
-38%
-71%
-92%
-100%
: Home position
W1-2 phase (CW mode：DIR=”H”)
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STEP
100%
98%
92%
83%
71%
56%
38%
20%
IOUT1A 0%
-38%
-71%
-100%
100%
98%
92%
83%
71%
56%
38%
20%
IOUT2A 0%
-38%
-71%
-100%
Home position
2W1-2 phase (CW mode：DIR=”H”)
Note 12. “+” means the current is flowing through the OUT1B from OUT1A and the OUT2B from OUT2A.
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10.4 Protection Functions
Table 11. Recovery type and the output state of the protection circuit
Protection Circuit
H-Bridge Outputs
Thermal Shutdown (TSD)
Hi-Z
Under Voltage Lockout (UVLO)
Hi-Z
Shorted-Load
Over Current Protection
Shorted-to-Ground
Hi-Z
(OCP)
Shorted-to-Power
Recovery type
Automatic
Automatic
Latch off
Thermal Shutdown Circuit (TSD)
If the internal temperature of the IC (Tj) reaches 175 °C (typ), the H-Bridge outputs Hi-Z. In addition, it will
automatically return to the normal operation when it becomes less than 145 °C (typ).
TTSD
TTSDHYS
TJ
VOUT
ON
OFF(Hi-Z)
ON
Figure 11. TSD Timing Chart
Under Voltage Lock Output Circuit (UVLO)
When VM voltage is lower than 6.35V (typ), the H-Bridge output is the Hi-Z. Please note that this circuit does
not operate during sleep mode. When UVLO operates, internal circuits which includes H-Bridge output,
internal regulator, charge pump circuit become disable, and also the control circuit is reset (initialize). If VM
voltage goes up than the specified voltage, UVLO is released. After the UVLO released, it restarts from the
home position. STEP input cannot be input during 3msec after the UVLO is canceled, to wait for the stable
operation of internal charge pump.
VM
VMHYS=0.5V(typ)
VMUVLO
VOUT
3ms(max)
ON
OFF(Hi-Z)
ON
Figure 12. UVLO Timing Chart
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Over Current Protection Circuit (OCP)
The IC has over current protection circuit to prevent breakdown of H-Bridge drivers. If the specified current
flows, H-Bridge outputs of all channel becomes latch off. It recovers by re-input of the motor power supply
voltage (VM) or input of SLEEPB or RESETB.
IOCPTRIP
IOUT
tOCPDET
VOUT
ON
tOCPDET
OFF(HI-Z)
OFF(HI-Z)
VM
SLEEPB or RESETB
Figure 13. OCP Timing Chart
Note13. If latch is released under the abnormal condition after OCP operation, the IC may repeat the
operation(latch → return → latch) . This will be the cause of heat generation and deterioration of the IC.
Also, chattering noise on SLEEPB or RESETB pin may cause a malfunction of OCP and it will result in
damage to the device.
Note14. When the Shorted-Load or the Shorted-to-Power occurs, the current comparison comparator works.
After the blanking time, the IC becomes slow decay mode and repeats normal operation every chopper cycle.
Note15. If the current sense resistors(RIS) are shorted, the OCP operates before the current comparator
comparison works in all conditions, so that the output of all channels will be Hi-Z.
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11. Recommended External Circuit
Recommended External Circuit
VM
CVM
CVM1
VDC
CVDC
CVG
CVM2
VM1
VM2
CHL
VG
CH
CL
OUT1A
OUT1B
M
AP1034
RR1
VREF
OUT2A
RR2
OUT2B
IS1
RIS1
IS2
RIS2
GND
FS
Exposed Pad
MODE1
ENABLE_B
MODE2
STEP DIR RESET_B
SLEEP_B
MCU
Figure 14. Recommended External Circuit
Table 12. Recommended External Components
Items
typ
Unit
Remark
CVM
100
Electrolytic
Capacitor
µF
CVM1
0.22
Ceramic Capacitor
µF
CVM2
0.22
Ceramic Capacitor
µF
CHL
0.01
Ceramic Capacitor
µF
CVG
0.1
Ceramic Capacitor
µF
CVDC
0.22
Ceramic Capacitor
µF
RIS1
0.2
Ω
At 1.56[A]setting (@VREF=2.5V)
RIS2
0.2
Ω
At 1.56[A]setting (@VREF=2.5V)
RR1
30
kΩ
At VREF=2.5V setting (@VC=5.0V)
RR2
30
kΩ
At VREF=2.5V setting (@VC=5.0V)
Note 16. Above values are examples. Please choose appropriate external components for your system board.
Note 17. Capacitance of CVM and CVC should be determined in consideration of the load current profile, the
load capacitance, the line resistance and etc. of the actual system board.
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Recommended Layout
Top View
Bottom View
Figure 15. Recommended Layout Pattern
Note 18. Please layout the large ground plane on the PCB.
Note 19. Exposed Pad (heat sink) is common to the ground terminal. Please connect it to the ground of the
PCB.
Note 20. The ground via of the PCB back side under IC mounted area is effective for heat radiation to each
layer of the PCB.
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12. Package
Outline Dimensions
AP1034AER : 24-pin QFN Package
Detailed diagram of A
Unit : mm
AP1034AEN : 32-pin QFN Package
Detailed diagram of A
Unit : mm
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Recommended Land Pattern
AP1034AER ： 24-pin QFN Package
4.6
3.0
0.22±0.05
2.6
3.0
4.6
2.6
φ0.3
Thermal Via
0.2
【unit：mm】
AP1034AEN： 32-pin QFN Package
【unit: mm】
*The most suitable dimensions of the mount pad change by a substrate material, solder paste materials, a soldering
method, device precision. It is therefore recommended that customers contact the actual design should be optimized
according to the situation.
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Marking
AP1034AER
1034AR
(2)
YWWAA
(3)
(1)
(4)
(5)
(1)
(2)
(3)
(4)
(5)
1pin Indication
Market No.
Year code (last 1 digit)
Week code
Management code
(1)
(2)
(3)
(4)
(5)
1pin Indication
Market No.
Year code (last 1 digit)
Week code
Management code
AP1034AEN
1034AN
(2)
YWWAA
(1)
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(3)
(4)
(5)
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13. Revise History
Date
(YY/MM/DD)
16/04/20
16/06/28
Revision
Page
Contents
00
12
01
18
First Edition
: Figure8
In addition, please do not make chattering noise for SLEEPB or
RESETB signal because it causes the malfunction of the OCP circuit
and may let an IC damage.
: Table 13. Recommended External Components
19
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IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or application of
AKM product stipulated in this document (“Product”), please make inquiries the sales office of
AKM or authorized distributors as to current status of the Products.
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application examples of AKM Products. AKM neither makes warranties or representations with
respect to the accuracy or completeness of the information contained in this document nor grants any
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to the information in this document. You are fully responsible for use of such information contained
in this document in your product design or applications. AKM ASSUMES NO LIABILITY FOR
ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF
SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may
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