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STA6940M

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/
STA6940M
Description
Combining low-power CMOS-compatible logic with high-
current, high-voltage power MOSFET outputs, the STA6940M
provides complete control and drive for brush DC motors.
It provides internal fixed off time, pulse-width modulation
(PWM) control of the output current, rated for 4 A normal
operating level.
The CMOS logic section provides four modes of operation:
forward and reverse normal drive rotation, outputs-off free
spin (coast), and electronic braking.
The innovative multi-chip internal structure separates the main
logic IC (MIC) from the four N-channel power MOSFETs. This
results in lower thermal resistance and greater efficiency.
PWM control allows constant-current control of output while
reducing heat generation and power losses by providing fixed
off-time dual decay modes. The internal charge pump ensures
full power availability for switching.
Features and Benefits
▪ Power supply voltage, V
BB
, 44 V maximum, 10 to 40 V
normal operating range
▪ Logic supply voltage, V
DD
, 3 to 5.5 V compatible
▪ Output current, I
O
,4 A average, 8 A maximum
▪ Output elements are all N-channel MOSFETs to reduce
losses
▪ Internal charge pump
▪ Forward, reverse, free, and brake control modes available
▪ Constant-current control:
▫ Off-time 35 μs, fixed (Slow Decay mode)
▪ Internal Overcurrent Protection (OCP) circuitry
▫ Off-time 142 μs fixed (Fast Decay mode)
▪ Internal Thermal Shutdown (TSD) circuitry
▪ ZIP type 18-pin fully-molded package (STA package)
Brushed DC Motor Driver IC With PWM Control
Functional Block Diagram
Package: 18-pin ZIP (STA)
Not to scale
Reg
Reg
Pre-Driver
Charge Pump
OSC
UVLO
Logic
MIC
CP
OA
OA
OB
OB
CP1
IN1
IN2
PWM_REF
OCP_REF
Diag
CP2 VBBVDD
714131218
2
5
6
8
9
11
3
16
17
10 15 4
1
VBB
Comp
Comp
PWM and
OCP Control
GND Sense2 Sense1
28106.01
2
SANKEN ELECTRIC CO., LTD.
28106.01
Brushed DC Motor Driver IC With PWM Control
STA6940M
Selection Guide
Part Number Package Packing
STA6940M 18-pin ZIP through hole mount 18 pieces per tube
*Contact Allegro for additional packing options
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Main Supply Voltage V
BB
44 V
Logic Supply Voltage V
DD
6V
Output Current I
O
(max) 100 s8A
Output Voltage V
O
–1.5 to V
BB
+ 1.5 V
Logic Input Voltage V
IN
–0.3 to V
DD
+ 0.3 V
PWM_REF Input Voltage V
PREF
–0.3 to V
DD
+ 0.3 V
OCP_REF Input Voltage V
OREF
–0.3 to V
DD
+ 0.3 V
Sensing Voltage V
RS
Except t
w
< 1 s –1 to 2 V
Power Dissipation P
D
DC drive 2.7 W
PWM drive (Slow Decay) 3.0 W
PWM drive (Fast Decay) 3.2 W
Junction Temperature T
J
150 ºC
Operating Ambient Temperature T
A
–20 to 85 ºC
Storage Temperature T
stg
–30 to 150 ºC
All performance characteristics given are typical values
for circuit or system baseline design only and are at the
nominal operating voltage and an ambient temperature,
T
A
, of 25°C, unless oth er wise stated.
Recommended Operating Conditions
Characteristic Symbol Conditions Min. Typ. Max. Unit
Main Supply Voltage V
BB
10 – 40 V
Output Current I
O
––4A
Logic Supply Voltage V
DD
Transient voltages at VDD pin must not
exceed ±0.5 V
3.0 – 5.5 V
PWM Reference Input Voltage V
PREF
Constant-current control – – 1 V
OCP Reference Input Voltage V
OREF
OCP operating – – 2 V
Case Temperature T
C
Package surface temperature without
heatsink
– – 85 °C
Allowable Power Dissipation, P
D
(W)
Ambient Temperature, T
A
(°C)
DC operation
PWM (Slow Decay)
PWM (Fast Decay)
R
QJA
= 42°C
/
W
3.2 W
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 1020304050607080
3.0 W
2.7 W
R
QJA
= 46°C
/
W
R
QJA
= 39°C
/
W
Power Derating Curve
3
SANKEN ELECTRIC CO., LTD.
28106.01
Brushed DC Motor Driver IC With PWM Control
STA6940M
ELECTRICAL CHARACTERISTICS valid at T
A
= 25°C, V
BB
= 24 V, V
DD
= 5 V; unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ. Max. Unit
Main Supply Current I
BB
Operating – – 20 mA
Logic Supply Current I
DD
– – 5 mA
Charge Pump Voltage V
cp
V
BB
= 10 to 40 V – V
BB
+ 5 – V
Charge Pump Switching Frequency f
cp
– 360 – kHz
Main Supply Undervoltage Protection*
V
UVBL
–7 – V
V
UVBH
– 7.8 – V
Logic Supply Undervoltage Protection*
V
UVDL
– 2.3 – V
V
UVDH
– 2.5 – V
Charge Pump Undervoltage Protection*
V
UVCL
– 3.8 – V
V
UVCH
–4 – V
MOSFET On Resistance R
DS(on)
I
D
= 4 A – 0.1 0.13
MOSFET Body Diode Forward Voltage V
F
I
F
= 4 A – 0.95 – V
MOSFET Breakdown Voltage V
DSS
53 – – V
Logic Input Voltage
V
IL
– – 0.25 × V
DD
V
V
IH
0.75 × V
DD
–– V
Logic Input Current IIL – ±1 – A
IIH – ±1 – A
Maximum Input Frequency f
clk
Clock duty cycle = 50% 100 – – KHz
PWM_REF Pin Input Voltage V
PREF
PWM_REF terminal 0.1 – 1.0 V
PWM_REF Pin Input Current I
PREF
– ±10 – A
OCP_REF Pin Input Voltage V
OREF
OCP_REF terminal 0.1 – 2.0 V
OCP_REF Pin Input Current I
OREF
– ±10 – A
PWM Sensing Voltage V
PSEN
Sense1, Sense2 terminals
V
PREF
–
0.045
V
PREF
–
0.015
V
PREF
+
0.015
V
OCP Sensing Voltage V
OSEN
Sense1, Sense2 terminals
V
OREF
–
0.045
V
OREF
–
0.015
V
OREF
+
0.015
V
Sense1, Sense2 Pin Input Current I
SENSE
Sense1, Sense2 terminals – ±20 – A
Diag Pin Output Voltage
V
DIAGL
I
DIAGL
= 1.25 mA – – 1.25 V
V
DIAGH
I
DIAGH
= –1.25 mA V
DD
– 1.25 – – V
Diag Pin Output Current
I
DIAGL
V
DIAGL
= 0.5 V – – 1.25 mA
I
DIAGH
V
DIAGH
= V
DD
– 0.5 V –1.25 – – mA
Diag Pin Output Frequency f
DIAG
During PWM off-time – 90 – kHz
PWM Minimum On-Time (Blanking Time) t
on(min)
–5 – s
PWM Off-Time t
POFF
PWM operating – 35 – s
OCP Minimum On-Time t
OON
OCP operating – 5 – s
OCP Off-Time t
OOFF
OCP operating – 142 – s
Crossover Current Delay Timing t
COCD
150 – 750 ns
Switching Time
t
con
Measured from input to output on – 3.0 – s
t
coff
Measured from input to output off – 2.7 – s
Thermal Shutdown Activation
Temperature
T
tsdon
Package back side surface temperature after
case permeated with heat from operation
– 140 – ºC
Thermal Shutdown Release
Temperature
T
tsdoff
– 115 – ºC
*The outputs will be disabled if any of the three undervoltage protection circuits are operating.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

STA6940M

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Brushed DC Motor Driver 18-Pin ZIP Tube
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