Ordering number : ENA1929B
STK681-352-E
Thick-Film Hybrid IC
Forward/Reverse Motor Driver
http://onsemi.com
Overview
The STK681-352-E is a hybrid IC for use in current control forward/reverse DC motor driver with brush.
Applications
Office photocopiers, printers, etc.
Features
Allows forward, reverse, and brake operations in accordance with the external input signal.
8A peak startup output current and 12A peak brake output current.
On-chip output short-circuit detection function.
Reduced voltage detection function (15V) for a motor supply voltage.
Connecting an external current detection resistor allows overcurrent detection and peak current control in the
PWMoperation mode.
Obviate the need to design for the dead time in order to turn off the upper- and lower drive devices when
switchingbetween the forward and reverse operation mode.
Specifications
Absolute Maximum Ratings at Tc = 25C
Parameter
Symbol
Conditions
Ratings
unit
Maximum supply voltage
VCC max
Input voltage
VIN max
Logic input pins
Output current 1
IO1 max
DC current
6.4
A
Output current 2
IO2 max
Pulse current: 10ms
8
A
Output current 3
IO3 max
Pulse current: 16s
24
A
Brake current
IOB max
12
A
Square wave current, operating time 15ms
(single pulse, low side brake)
Allowable power dissipation
PdPK max
No heat sink
Operating substrate temperature
Tc
Metal surface temperature of the package
Junction temperature
Tj max
Storage temperature
Tstg
38
V
-0.3 to +6.0
V
2.8
W
-20 to +105
C
150
C
-40 to +125
C
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.
ORDERING INFORMATION
See detailed ordering and shipping information on page 14 of this data sheet.
Semiconductor Components Industries, LLC, 2013
June, 2013
61913HK 018-13-0025 /70611HKPC/30211HKPC No.A1929-1/14
STK681-352-E
Allowable Operating Ranges at Ta=25C
Parameter
Symbol
Operating supply voltage
VCC
Input voltage
VIN
Output current 1
IO1
Conditions
Ratings
With signals applied
unit
18 to 29
V
0 to 5.5
V
DC current, Tc=80C
4.6
A
3.8
A
12
A
Output current 2
IO2
DC current, Tc=105C
Brake current
IOB
Square wave current, operating time 2ms,
Low side brake,Tc=105C
Refer to the graph for each conduction-period tolerance range for the output current and brake current.
Electrical Characteristics at Tc=25C, VCC=24V
Parameter
Symbol
Conditions
VCC supply current
ICCO
ENABLE=GND, IN1=IN2=3.3V
FET diode forward voltage
Vdf
Output saturation voltage 1
Vsat1
min
typ
max
unit
9.3
11
If=1A (RL=23)
0.76
1.4
V
RL=23, F1, F2
140
200
mV
50
85
mV
50
A
Output saturation voltage 2
Vsat2
RL=23, F3, F4
Output leak current
IOL
F1, F2, F3, and F4 OFF operation
Input high voltage
VIH
IN1, IN2, ENABLE pins
Input low voltage
VIL
IN1, IN2, ENABLE pins
High-level input current
IILH
IN1, IN2, ENABLE pins, VIH=3.3V
Low-Level Input current
IILL
IN1, IN2, ENABLE pins, VIL=GND
Overcurrent detection voltage
VOC
Between pins Vref1 and S.P
Internal PWM frequency
fc
Overheat detection temperature
TSD
2.5
Design guarantee
V
33
0.8
V
50
A
10
A
62
kHz
0.48
32
mA
46
144
V
C
Note: A fixed-voltage power supply must be used.
Package Dimensions
unit:mm (typ)
24.2
(18.4)
4.5
14.4
11.0
14.4
(11.0)
(R1.47)
19
(3.5)
1
1.0
0.5
18 1.0=18.0
0.4
2.0
4.0
4.45
No.A1929-2/14
STK681-352-E
Derating Curve of Motor Current, IO, vs. STK681-352-E Operating Board Temperature, Tc
IO - Tc
7
DC
Motor current, IO - A
6
PWM(VCC=24V)
5
4
3
2
1
0
0
10
20
30
40
50
60
70
80
90
100
110
Operating Substrate Temperature, Tc- C
(The maximum PWM frequency is 50kHz.)
The PWM frequencies in the above graph indicate the ENABLE signal.
The same PWM IO derating curves as those shown above will be obtained when the internal PWM frequency of the
STK681-352-E is used.
Increasing the VCC supply voltage narrows the IO derating curve range, so IO should be set in reference to the above
graph.
The above operating substrate temperature, Tc, is measured immediately when the motor is started.
Since Tc fluctuates due to the ambient temperature, Ta, the motor current value, and continuous or intermittent
operations of the motor current, always confirm this values using an actual set.
The Tc temperature should be checked in the center of the metal surface of the product package.
STK681-352-E Allowable Brake Current Range (Low side: F3, F4=ON)
IOB - t
13
Brake current, IOB - A
12
11
Tc=25°C
10
9
8
70°C
80°C
90°C
7
6
5
1.0
105°C
2
3
5 7 10
2
3
5 7 100
2
3
5 7 1000
Conduction time, t - ms
No.A1929-3/14
STK681-352-E
STK681-352-E Allowable Brake Current Range (High side: F1, F2=ON)
or Allowable Startup Current Range
IO - t
9
Single-pulse current, IO - A
8
7
Tc=25°C
6
90°C
80°C
5
70°C
4
105°C
3
2
1.0
2
3
5 7 10
2
3
5 7 100
2
3
5 7 1000
Conduction time, t - ms
No.A1929-4/14
STK681-352-E
Internal Block Diagram
OUT1
Unassigned pins
5
11
12
15
IN2
8
10
VCC
7
OUT2
9
4
6
F1
F2
F3
F4
17
IN1
16
ENABLE
18
GND
1
2
VCC
3
Power supply
for Logic
Output short-circuit
detection
VDD
Overheat
Detection
FAULT
Latch
13
Overcurrent
Detection
Vref
19
PWM
(46kHz typ)
Constantcurrent control
Setting voltage
(0.48V typ)
S.GND
14
No.A1929-5/14
STK681-352-E
Sample Application Circuit
STK681-352-E
9
FAULT
13
3.3V
N.C
15
IN1
16
IN2
17
ENABLE
(DC or PWM)
10
OUT1
8
CCW
18
R1
12
N.C
11
N.C
4
R2
C1
47F to /50V
3
C3
0.1F
CW
N.C
5
19
Motor
OUT2
6
Vref
C2
10F/50V
VCC=24V
7
2
GND
Rs
1
14
S.GND
Motor Drive Conditions (H: High-level input; L: Low-Level Input)
Stop
IN1
IN2
ENABLE
H
L
L
Turns the power supply OFF.
Remarks
ENABLE must be set Low when VCC is rising or falling.
L
H
L
H
H
L
Forward (CW)
H
L
H
Reverse (CCW)
L
H
H
Brake
L
L
L or H
VCC side Brake MOSFET ON
H
H
H
GND side Brake MOSFET ON
No input signal is needed that turns off the upper- and
lower-side drive devices when switching the rotational
direction.
* Output control is enabled by applying an external PWM signal to the ENABLE pin.
The product can run at a minimum external PWM pulse width of 1s. In the case when the high pulse width is less
than 16s, however, the IC may fail to detect a short-circuit condition when an output short-circuit occurs.
FAULT signal is generated to indicate an error condition if VCC falls below the allowable operating range when the
ENABLE pin is set to high during motor rotation or PWM operation. For this reason, ENABLE must be set to low
when VCC is rising or falling.
When both IN1 and IN2 are set low, the MOSFET on the VCC side is driven. To minimize the loss when stopped, set
IN1 = IN2 = High and ENABLE = Low to turn off the gate signal to the VCC side MOSFETs.
Setting the current limit using the Vref pin
Peak output current (Iop) = (Vref ÷ 4.9) ÷ Rs
“4.9” in the above formula indicates the portion of the Vref voltage that is divided using the circuit inside the
control IC.
Vref = (R2 ÷ (R1 + R2)) × 5.0V
Rs is the external current detection resistance value of the HIC, and Vref 2.0V must be satisfied so that
overcurrent detection is not triggered.
No.A1929-6/14
STK681-352-E
Notes
(1) Be sure to set the capacitance of the power supply bypass capacitor, C1, so that the ripple current of the capacitor,
which varies as motor current increases, falls within the allowed range.
(2) Chopping operations based on F3 and F4 are used for current control. The timing given below is used for OUT1 or
OUT2 voltage output and for F3 or F4 drain current.
(3) Do not connect the N.C pins (5, 11, 12 and 15 pin) shown in the internal block diagram or sample application
circuit to a circuit pattern on the PCB.
OUT1 or OUT2
Output voltage
VCC+Vdf
GND
IO peak (current setting value)
F3 or F4
Drain current
0A
22F
IO peak (current setting value)
Motor current
0A
(4) Sample Timing Diagram
IN1
IN2
ENABLE
Stop
Forward
rotation
Brake
Reverse
rotation
Stop
Forward
rotation
Brake
Stop
(5) If the current detection resistor, Rs, connected to pin1, pin2, and pin3 is short-circuited, the overcurrent detection
circuit does not operate. If the output pin is short-circuited directly to VCC or connected directly to GND, an
output short-circuit condition is detected and the output is latched in the off state. To restart the operation, turn on
VCC again.
(6) Smoke Emission Precautions: There is a possibility of smoke emission if the hybrid IC is subjected to physical or
electrical damage as the result of being used without compliance with the specifications.
No.A1929-7/14
STK681-352-E
I/O Functions of Each Pin
Pin Name
Pin No.
IN1
16
IN2
17
Function
Input pin for turning F2 and F4 ON and OFF
At low level F2: ON and F4: OFF; at high level, F2: OFF and F4: ON
Input pin for turning F1 and F3 ON and OFF
At low level F1: ON and F3: OFF; at high level, F1: OFF and F3: ON
Pin for turning F3 and F4 ON; At high level F3 and F4: ON
ENABLE
18
ENABLE must be set Low when VCC is rising and falling.
ENABLE must be set High to drive the motor.
FAULT
13
activated. When the detector is activated, this pin is set low and all of F1, F2, F3 and F4 in the final stage are
OUT1
8, 10
OUT2
4, 6
Monitor pin used when either of the output short-circuit detector, overcurrent detector, or overheat detector is
latched off.
This pin connects to the motor and outputs source/sync current depending on conditions at IN1 and IN2.
This pin connects to the motor and outputs source/sync current depending on conditions at IN1 and IN2.
This pin limits the peak current when motor startup.
The current setting voltage, Vref, is set to the value of 4.9 times the voltage drop of the external current detection
Vref
19
GND
1, 2, 3
Power system ground
S.GND
14
Control system ground
VCC
7, 9
Motor system supply voltage
resistor.
The internal overcurrent detection level is 0.48V, so setting Vref 2.0V is recommended.
No.A1929-8/14
STK681-352-E
Technical Information
1. Configuration of each pins
Input pins: 16, 17, 18 pin
5V
10k
100k
VSS
The input pins of this driver all use Schmitt input. Typical specifications at Tc = 25C are given below. Hysteresis
voltage is 0.3V (VIHa-VILa).
When rising
When falling
1.8V typ
1.5V typ
Input voltage
VIHa
VILa
Input voltage specifications are as follows.
VIH = 2.5V min
VIL = 0.8V max
Output pin
5V
Pin 13
VSS
No.A1929-9/14
STK681-352-E
To 1, 2, 3 pins
VDD=5V
Vref/4.9
Pin 19
PWM control
To MOSFET
gate
Amplifier
VSS
[VCC Reduced voltage detection]
The internal control IC of the driver has a function that detects reduced voltage when VCC is supplied, to prevent
insufficient internal P-channel MOSFET gate voltage. The reduced voltage detection level is set to VCC = 15V (typ.).
15V
VCC
MOSFET
off
MOSFET
off
When VCC 15V, an internal control voltage has not risen above the preset threshold level, so ENABLE must be set
to low in order to turn off the MOSFET.
No.A1929-10/14
STK681-352-E
2. Output short-circuit detection, Overcurrent Detection and Overheat Detection
Each detection function operates using a latch system and turns output off. To restore output operation, turn the VCC
power supply off and then on again to apply a power-on reset.
[Output Short-circuit Detection, Overcurrent Detection]
When the output pin is simply connected to the circuit GND or VCC, or when the output load is short-circuited, the
output short circuit detector must be activated and turn the output off.
Constant current PWM control can be performed by connecting a current detection resistor to pins 1, 2 and 3, and
setting the Vref pin voltage to less than 2.0V. In addition, when this current detection resistor voltage exceeds 0.48V
(typ.), the overcurrent detector is activated and shuts the output off.
[Overheat Detection]
Rather than directly detecting the temperature of the semiconductor device, overheat detection detects the
temperature of the aluminum substrate (144C typ).
Within the allowed operating range of IO1 (4.6A) recommended in the specifications, if a heat sink attached for the
purpose of reducing the operating substrate temperature, Tc, comes loose, the semiconductor can operate without
breaking.
However, we cannot guarantee operations without breaking in the case of operation other than those recommended,
such as operations at a current exceeding IOH max (4.6A) that occurs before overcurrent detection is activated.
3. Mitigated Curve of Package Power Loss, PdPK, vs. 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 2.8W is allowable at Ta=25C, and of up to 1.5W at Ta=60C.
Allowable power dissipation, PdPK (no heat sink) - Ambient temperature, Ta
PdPK - Ta
Allowable power dissipation, PdPK - W
3.0
2.5
2.0
1.5
1.0
0.5
0
0
20
40
60
80
100
120
Ambient Temperature, Ta- C
No.A1929-11/14
STK681-352-E
4. Data
Vsat1, Vsat2 - IO
Output saturation voltage, Vsat1, Vsat2 - mV
2600
Tc=25°C
2400
2200
2000
1800
1600
1400
1200
at 1
Vs
1000
)
°C
05
800
(1
at1
Vs
C)
(105°
Vsat2
Vsat2
600
400
200
0
0
1
2
3
4
5
6
7
8
7
8
Output current, IO - A (DC)
Vdf - IO
1.00
Tc=25°C
Diode forward voltage, Vdf - V
0.95
gh
(Hi
Vdf
0.90
0.85
)
side
0.80
0.75
Vdf (L
0.70
)
ow side
0.65
0.60
0.55
0.50
0.45
0.40
0
1
2
3
4
5
6
Output current, IO - A (DC)
No.A1929-12/14
STK681-352-E
5. Other Notes on Use
In addition to the “Notes” indicated in the Sample Application Circuit, care should also be given to the following
contents during use.
(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 100 to 1k resistors in lines
connected to the input pins.
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 or 3.3V power supply signal lines) that run parallel near the motor output lines OUT1 and OUT2.
3) Pins 5, 11, 12 and 15 of this product are N.C pins. Do not connect any wiring to these pins.
(4) When mounting multiple drivers on a single PC board
When mounting multiple drivers on a single PC board, the GND design should mount a VCC decoupling
capacitor, C1, for each driver to stabilize the GND potential of the other drivers. The key wiring points are as
follows.
24V
3.3V
79
16
Input
Signals
17
79
Motor
1
IC1
18
16
Input
Signals
C1 for IC1
1
2
19 143
17
79
Motor
2
IC2
18
16
Input
Signals
C1 for IC2
1
2
19 143
GND
17
Motor
3
IC3
18
C1 for IC3
1
2
19 143
GND
Short
Thick and short
Thick
No.A1929-13/14
STK681-352-E
ORDERING INFORMATION
Device
STK681-352-E
Package
SIP-19
(Pb-Free)
Shipping (Qty / Packing)
20 / Fan-Fold
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