STK681-360-E Application Note

STK681-360-E
Thick Film Hybrid IC
Forward/Reverse Motor Driver
Application Note
http://onsemi.com
Overview
The STK681-360-E is a hybrid IC for use in PWM current control forward/reverse DC motor driver with brush.
Function
 Allows forward, reverse, and brake operations in accordance with the external input PWM signal.
 5.8A peak startup output current and 8A peak brake output current.
 Built-in current detection resistor (0.05Ω : resistor tolerance 2%) and supports constant-current control.
 Obviate the need to design for the dead time in order to turn off the upper- and lower drive devices when switching
between the forward and reverse operation mode.
Specifications
bsolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
unit
Maximum supply voltage 1
Vcc1 max
Vcc2=0V
52
V
Maximum supply voltage 2
Vcc2 max
No signal
-0.3 to +7.0
V
Input voltage
VIN max
Logic input pins
-0.3 to +7.0
V
Output current1
IO max
IOB max
VDD=5.0V, DC current
5.8
A
8
A
Brake current
VDD=5.0V, square wave current,
operating time 60ms (single pulse ,low side brake)
Allowable power dissipation
PdPK max
No heat sink
3.1
W
Operating substrate temperature
Tc
Metal surface temperature of the package
105
C
Junction temperature
Tj max
150
C
Storage temperature
Tstg
-40 to +125
C
Notes
*1 Refer to the graph for each conduction-period tolerance range for the output current and brake current.
*2 PWM pin (14pin) is active Low.
*3 Io1, Io2, Io3 connect Vref2 pin to GND and a current value when over-heating current control does not work
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.
Semiconductor Components Industries, LLC, 2013
Dec, 2013
1/21
STK681-360-E Application Note
Recommended Operating Conditions at Ta = 25C
Parameter
Symbol
Conditions
Ratings
unit
Maximum supply voltage 1
Vcc1 max
Vcc2=0V
52
V
Maximum supply voltage 2
Vcc2 max
No signal
-0.3 to +7.0
V
Input voltage
VIN max
Logic input pins
-0.3 to +7.0
V
Output current1
IO max
VDD=5.0V, DC current
5.8
A
Brake current
IOB max
VDD=5.0V, square wave current,
8
A
operating time 60ms (single pulse ,low side brake)
Allowable power dissipation
PdPK max
No heat sink
3.1
W
Operating substrate temperature
Tc
Metal surface temperature of the package
105
C
Junction temperature
Tj max
150
C
Storage temperature
Tstg
-40 to +125
C
typ
max
unit
2.6
3.5
mA
Notes
*4: A fixed-voltage power supply must be used.
Electrical Characteristics at Ta  25C, VCC = 5V
Parameter
Symbol
Conditions
min
VCC2 supply current
ICCO
Forward or reverse operation
FET diode forward voltage
Vdf
If=1A (RL=23)
0.8
1.4
V
Output saturation voltage 1
Vsat1
RL=23, F1, F2
0.09
0.15
V
Output saturation voltage 2
Vsat2
RL=23,
0.11
0.17
V
Output leak current
IOL
F1, F2, F3, and F4 OFF operation
50
A
Input high voltage 1
VIH1
IN1, IN2 pin
4.5
V
Input high voltage 2
VIH2
PWM pin
4.5
V
Input low voltage
VIL
IN1 ,IN2 and PWM pins
Input current
IIH1
IN1, IN2 pins, VIH1=5V
Current setting voltage
Vref1
Between Vref1 and S.P pins
PWM Input current
IILP
PWM pin，VIL=GND
PWM pin turn-on delay time
ton-*
Output current 1A
0.8
μs
PWM pin turn-on delay time
toff-*
Output current 1A
3.5
μs
F3, F4+ current detection resistor
0.1
0.2
0.6
V
0.4
mA
0.29
0.1
0.6
V
0.65
mA
2/21
STK681-360-E Application Note
Package Dimensions
unit : mm (typ)
3/21
STK681-360-E Application Note
Pin Assignment
STK681-360-E
1
S.P
2
RSO
3
N.C
4
N.C
5
OUT2
6
Vcc1
7
OUT1
8
Vcc1
9
N.C
10
N.C
11
IN1
12
IN2
13
PWM
14
Vcc2
15
Vref1a
16
Vref2
17
Vref1b
18
RSI
19
STK681-360-E
STK681-332
GND
4/21
STK681-360-E Application Note
Block Diagram
N.C
N.C
11
10
Vcc1 OUT1
N.C N.C
5
4
9
OUT2 Vcc1
8
6
7
N.C pins are no connection
IN1
F1
F2
F3
F4
12
13
IN2
15 Vcc2
82k
16
PWM 14
Current
Overheating
current
control
control
5.1k
19
3
Vref1a
RSI
RSO
Rs
0.05
1
GND
2
S.P
18
Vref1b
17 Vref2
5/21
STK681-360-E Application Note
Recommend hole size for Lead Frame on PCB; 0.9 mm(max)
0.4 +0.2
0.5 +0.05
-0.05
0.9(0.814 to 0.570)
Lead Frame
Application Circuit Example
Vcc2(5V)
15
7
IN1
12
9
IN2
13
PWM
14
8
STK681-360-E
Vref2
C2
10μ／50V
17
Vref1a
16
Vref1b
6
Vcc1=24V
OUT1
N.C
18
5
N.C
RSO
3
10
RSI
19
11
N.C
N.C
S.P
Moter
OUT2
4
2
CCW
CW
C1
above 47μ／50V
1
GND
6/21
STK681-360-E Application Note
Notes
A fixed-voltage power supply must be used.
STK681 -360 -E motor current derating curve
for the operating substrate temperature Tc
6
5.5
5
4.5
4
A
3.5
3
2.5
Moter curr ent Io
2
1.5
1
0.5
0
0
10
20
30
40
50
60
70
80
Operating substrate tempareture
90
100
110
Tc °C
Notes
 The motor current Io shown above is the range for DC and chopping operation.
The DC operating current range is within both the allowable Vcc1 operating range and the derating curve shown in the figure.
 The operating substrate temperatures in the figure above are values measured when the motor is operating.
The temperature Tc varies with the ambient temperature Ta, the motor drive current, and whether the motor current
is continuous or the state of its intermittent operation. Therefore Tc must be verified in an actual end product
system.
 The Tc temperature should be checked in the center of the metal surface of the product package.
7/21
STK681-360-E Application Note
Allowable STK681-360-E braking current ranges
(High side:F1,F2=ON)
9
Tc=25°C
Braking current IoB(A)
8
7
Tc=70°C
Tc=80°C
Tc=90°C
Tc=105°C
6
5
4
3
2
1
0
1
10
100
Operating time t(ms)
1000
Allowable STK681-360-E braking current ranges
(Low side:F3,F4=ON)
9
Tc=25°C
Tc=70°C
Tc=80°C
Tc=90°C
Braking current IoB(A)
8
7
6
Tc=105°C
5
4
3
2
1
0
1
10
100
Operating time t(ms)
1000
8/21
STK681-360-E Application Note
1.Substrate temperature rise Tc-Internal average power loss PdAV characteristics(no heat sink)
Substrate temperature rise, Tc (no heat sink) - Internal average power
Substrate temperature rise rise, Tc -°C
dissipation, PdAV
80
70
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
Hybrid IC internal average power loss, PdAV - W
2. Average internal power loss (Pd) at DC - motor current (Io) characteristics.
STK681-360-E Average internal power loss Pd vs moter Io
Internal average power loss ,Pd W
3.5
3
Vcc1=24v
Vcc2=5.0v
2.5
2
1.5
High side loss
1
Low side loss
0.5
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Moter current Io(DC) A
3. Over temperature current suppression characteristics.
STK681-360-E Over temperature current suppression characteristics
Io vs Tc < Load:2Ω + 5mH>
5.0
Average current Io A
4.0
3.0
2.0
1.0
0.0
0
10
20
30
40
50
60
70
80
90
Operating substrate temperture Tc °C
100
110
120
The over temperature current suppression function protects the driver from destruction when
an abnormal motor locked (physically constrained) state occurs.
9/21
STK681-360-E Application Note
4. Package power loss PdPK derating curve for the ambient temperature Ta.
Package power loss, PdPK, refers to the average internal power loss, PdAV, allowable without a heat sink.
The figure below represents the allowable power loss, PdPK, vs. fluctuations in the ambient temperature, Ta.
Power loss of up to 3.1W is allowable at Ta=25C, and of up to 1.75W at Ta=60C.
* The package thermal resistance θc-a is 25.8°C/W.
Allowable power dissipation, PdPK (no heat sink) - Ambient temperature, Ta
Allowable power dissipation, PdPK - W
3.5
3
2.5
2
1.5
1
0.5
0
0
20
40
60
80
100
120
Ambient temperature, Ta - °C
5. Electrical characteristics
<Vdf vs If>
<Vsat1 / Vsat2 vs Io>
STK681-360-E Vsat1, Vsat2-Io
1.4
1.2
1.2
1
1
Vsat1 , Vsat2 V
Vdf V
STK681-360-E Vdf-If
1.4
0.8
0.6
Vdf(High side)
0.4
Vsat1(High side)
Vsat2(Low side)
0.8
0.6
0.4
Vdf(Low side)
0.2
0.2
0
0
0
1
2
3
4
5
6
Diode forward current If A
7
8
0
1
2
3
4
5
6
7
8
Output current Io A
10/21
STK681-360-E Application Note
7. A.S.O(F1,F2,F3,F4)
STK681-360-E F1, F2 A.S.O
100
ID A
10
1ms
1
10ms
100ms
1s
0.1
1
10
100
VDS V (Tc=25°C ,Tj=150°C , 1pulse)
STK681-360-E F3, F4 A.S.O
100
ID A
10
1ms
1
10ms
100ms
1s
0.1
1
10
100
VDS V (Tc=25°C ,Tj=150°C , 1pulse)
11/21
STK681-360-E Application Note
Motor Drive Conditions (H: High-level input; L: Low-Level Input)
IN1
H
H
H
L
H
IN2
H
H
L
H
L
PWM
L or H
H
H
H
L
Reverse(CCW)
L
H
L
Brake
L
L
L or H
Stop 1 (Standby)
Stop 2 (Power supply to the
motor is off due to an input
during motor operation)
Forward(CW)
Function
The state where the motor is not turning
Power supply to the motor was turned
off due to a stop signal being applied
during motor operation.
An input signal that turns off the high
and
low side drive elements during
forward/reverse switching is not
required.
The ground side MOSFET is in the on
state.
* The state IN1 = IN2 = high, PWM = L is illegal during motor operation.
* PWM pin (14pin) is active Low.
Notes
(1)The value of the power supply bypass capacitor C1 must be set so that the capacitor ripple current, which changes
with the motor current, remains within the allowable range.
(2) While the Vref2 pin is normally handled by being left open, note that the thermal protection circuit will no longer
operate if this pin is connected to ground or the P.S pin.
(3) Current is controlled by a constant-current chopping operation by transistors F1 and F2. The timing for the
OUT1 or OUT2 output voltage and the F1 or F2 drain current is shown below.
(4) Do not connect or wire any of the NC (unused) pins that appear in either the block diagram or the application
circuit examples to the circuit pattern on the PCB.
Vcc1-Vsat1
OUT1 or OUT2
Output voltage
GND
Peak Io
F1 or F2
(Set current value)
Drain current
30μs
Moter current
0A
Peak Io
(Set current value)
0A
(5)Since the response time of the ground side drive element during forward/reverse direction switching is a few tens
of microseconds, this product is not appropriate for H bridge applications. This device should only be used as a
DC motor driver.
(6)Timing Charts
12/21
STK681-360-E Application Note
IN1
IN2
PWM
Stop1
Forward
Reverse
Brake
Forward
Reverse
Brake
Stop1
Stop2
IN1
IN2
PWM
Stop1
Forward
Reverse
Forward
Stop2
Brake
Stop1
Reverse
Brake
(7)Smoke emission warning: This hybrid IC may emit smoke if it is used under conditions that exceed its
specifications.
I/O Functions of Each Pin
Pin
name
Pin No
IN1
12
IN2
13
PWM
14
OUT1
8
Motor connection that outputs a source or sink current depending on the states of IN1 and IN2.
OUT2
Vref1a
Vref1b
6
16
18
Vref2
17
Motor connection that outputs a source or sink current depending on the states of IN1 and IN2.
The current setting voltage (Vref1) is used by connecting Vrefa to Vrefb
The peak Io level is determined by Io(peak) = Vref1 ÷ Rs.
This pin should normally be left open.
Connecting this pin to ground or the S.P pin disables the thermal protection circuit.
S.P
2
The Vref1 voltage can be reduced by connecting a resistor between Vref1 and the S.P pin.
RSO
3
This pin can be used to monitor the voltage across the current detection resistor Rs and is connected to the
RSI pin.
RSI
19
Input for the circuit that compares with Vref1. This pin is used connected to the RSO pin.
Functions
Input that controls the on/off state of F1 and F3.
When high: F1: on, F3: off, when low: F1: off, F3: on.
Input that controls the on/off state of F2 and F4.
When high: F2: on, F4: off, when low: F2: off, F4: on.
Input that forces F1 and F2 to the off state: when high F1 and F2 will be off.
When high F1 and F2 will be off, When low F1 and F2 will be on,
Configuration of I/O Pin
<IN1,IN2>
<PWM>
To connect
IN1 or IN2
Low side MOSFET gate
To
Comparator
IN1 : 12pin
IN2 : 13pin
Vcc2
RSO
To connect
Hi side MOSFET gate
PWM 14
GND
Substrate Specifications (Substrate recommended for operation of STK681-360-E)
Size : 100mm × 65mm × 1.6mm 1-layer board
13/21
STK681-360-E Application Note
Material : Phenol
Copper side (35μ)
Allowable power dissipation,
PdPK - W
Allowable power dissipation(Reference value)
Allowable power dissipation, PdPK (no heat sink) - Ambient
temperature, Ta
3.5
3
2.5
2
1.5
1
0.5
0
0
20
40
60
80
100
120
Ambient temperature, Ta - °C
14/21
STK681-360-E Application Note
Evaluation board
STK681-360-E (100.0mm x 65.0mm x 1.6mm, phenol 1-layer board)
PWM
15/21
STK681-360-E Application Note
Bill of Materials for STK681-360-E Evaluation Board
Designator
C1
C2
R1
Quantity
Description
1
1
1
Value
Vcc1 Bypass
47μF
Capacitor
/50V
Vcc2 Bypass
10μF
Capacitor
/50V
Pull-up
1.0 kΩ
Tolerance
Footprint
SUN
±20％
1
SUN
±20％
HIC
1.0 kΩ
Free
50ME47CA
YES
YES
50ME10CA
YES
YES
AKAHANE
±5％
RN14S102JK
YES
YES
AKAHANE
±5％
RN14S102JK
YES
YES
RN14S****FK
YES
YES
STK681-360-E
NO
YES
ERECTRONICS
Resistor to
1
Lead
Allowed
ERECTRONICS
Pull-up
1
Substitution
Part Number
ERECTRONICS
Resistor
R3
Manufacturer
ERECTRONICS
Resistor
R2
Manufacturer
AKAHANE
±1％
Set Vref
ERECTRONICS
Hybrid IC
SANYO
semiconductor
JP1, 2, 3
3
Jumper for
Mac-Eight
JR-4
YES
YES
TP1 to TP10
10
Test Point
Mac-Eight
ST-1-3
YES
YES
Notes: R3 are used to Vref for current setting. Therefore their value do not mention on this table.
Evaluation Circuit
DC motor
Vcc2(5V)
R1
R2
IN1
IN2
OUT1
PWM
OUT2
C2 ＋
＋
C1
R3
JP2
JP1
GND(PG)
2 1
GND(SG)
S.P
GND
5 4 3
N.C
RSO
6
N.C
8 7
OUT2
Vcc1
N.C
IN1
N.C
IN2
PWM
Vref1a
Vcc2
Vref1b
Vref2
19 18 17 16 15 14 13 12 11 10 9
OUT1
Vcc1
JP3
RSI
Vref
Vcc1
HIC: STK681-360-E
16/21
STK681-360-E Application Note
Waveform example
STK681-360-E(Current limit 4.2A setting)
IN1 and IN2; 5V/div, Output current; 2A/div
IN1
IN2
OUT1 Output current
Positive direction is
source current.
Peak 6A
FORWARD
BRAKING
STK681-360-E(Current limit 2A setting)
IN1 5V/div, OUT1 20V/div, Output current; 2A/div
IN1
OUT1
OUT1 Output current
Positive direction is
source current.
Current limit active.
Output is chopped.
FORWARD
Current control is slow decay.
17/21
STK681-360-E Application Note
STK681-360-E control Bipolar Transistor or MOSFET at High side by constant-current PWM control system.
Current control enters Slow decay mode.
STK681-360-E
STK681-360-E(Current limit 4.2A setting)
IN1 and IN2; 5V/div, Output current; 2A/div
IN1
IN2
OUT1 Output current
Positive direction is
source current.
FORWARD
BRAKING
18/21
STK681-360-E Application Note
Evaluation Board Manual
[Supply Voltage]
Vcc1 (10 to 30V) : Power Supply for DC motor
Vcc2 (5V)
: Power Supply for internal logic IC
[Operation Guide]
1. Motor Connection:
Connect the motor to OUT1 and OUT2.
2. Initial Condition Setting:
Set to signal condition IN1=H, IN2=H, and PWM=L.
3. Power Supply:
At first, supply DC voltage to Vcc2(5.0V).
Next, supply DC voltage to Vcc1.
4. Set to Forward or Reverse signal condition with PWM=Low.
Turn “High” INH signal.
Output current flows between OUT1 and OUT2.
5. Motor Operation
[Setting the current limit using the Vref pin]
19/21
STK681-360-E Application Note
Notes in design
(1) Allowable operating range
Operation of this product assumes use within the allowable operating range. If a supply voltage or an
input voltage outside the allowable operating range is applied, an overvoltage may damage the
internal control IC or the MOSFET.
If a voltage application mode that exceeds the allowable operating range is anticipated,
connect a fuse or take other measures to cut off power supply to the product.
(2)Input pins
If the input pins are connected directly to the PC board connectors, electrostatic discharge or
other overvoltage outside the specified range may be applied from the connectors and may
damage the product. Current generated by this overvoltage can be suppressed to effectively
prevent damage by inserting 100Ω
Ω
Take measures such as inserting resistors in lines connected to the input pins.
(3) Input Signal Lines
1) Do not use an IC socket to mount the driver, and instead solder the driver directly to the PC board to
minimize fluctuations in the GND potential due to the influence of the resistance component and
inductance component of the GND pattern wiring.
2) To reduce noise due to electromagnetic induction to small signal lines, do not design small signal lines
(sensor signals, 5V power supply signal lines) that run parallel near the motor output lines OUT1 and
OUT2.
3) Pins 4, 5, 10 and 11 of this product are N.C pins. Do not connect any wiring to these pins.
20/21
STK681-360-E Application Note
ORDERING INFORMATION
Device
STK681-360-E
Package
SIP-19
(Pb-Free)
Shipping (Qty / Packing)
15 / Tube
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