Document
TC78H651AFNG
TOSHIBA CDMOS Integrated Circuit Silicon Monolithic
TC78H651AFNG
1.8-V Dual bridge driver IC
The TC78H651AFNG is a dual bridge driver IC for DC motors/Stepping motors which incorporates DMOS with low ON resistance in output transistors. Forward, reverse, or stop mode can be selected. Over current detection, thermal shutdown, and under voltage lockout functions are implemented.
Features
• Power supply voltage (Absolute maximum ratings): 8.0 V (max)
• Power supply voltage (Operating Range): 1.8 V to 7.5 V
• Output current (Absolute maximum ratings): 2.0A (max)
• Output ON resistance: 0.22 Ω (typ.) (Ta = 25 °C, Sum of upper and lower side, VM = 5.0 V)
P-TSSOP16-0505-0.65-001 Weight: 0.06 g (typ.)
• Built-in standby function: Consumption current 0 μA (typ.)
• Built-in cross conduction protection circuit
• Built-in over current detection (ISD), thermal shutdown (TSD), and under voltage lockout (UVLO)
• Forward / Reverse / Stop modes are selectable
• Package: P-TSSOP16-0505-0.65-001
© 2019
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Toshiba Electronic Devices & Storage Corporation
2019-1-31
Pin assignment (Top view)
VM 1 NC 2 IN4 3 IN3 4 NC 5 IN1 6 IN2 7 NC 8
TC78H651AFNG
16 NC 15 OUT4 14 OUT3 13 NC 12 OUT1 11 OUT2 10 NC 9 GND
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2019-1-31
Block Diagram
TC78H651AFNG
VM
IN1 IN2 IN3 IN4
37kΩ 150kΩ
37kΩ 150kΩ
37kΩ 150kΩ
37kΩ 150kΩ
Regulator
Control Circuit
UVLO TSD ISD
OUT1 OUT2
OUT3 OUT4 GND
Note: Please note that in the block diagram, functional blocks or constants may be omitted or simplified for explanatory purposes.
Pin Functions
Pin name
VM NC IN4 IN3 NC IN1 IN2 NC GND NC OUT2 OUT1 NC OUT3 OUT4 NC
Pin No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Functional description
Power supply pin for motor Non connection Control input pin 4 Control input pin 3 No connection Control input pin 1 Control input pin 2 Non connection GND pin Non connection Output pin 2 Output pin 1 Non connection Output pin 3 Output pin 4 Non connection
Remarks
Operation range is from 1.8 V to 7.5 V. Use this pin open. Refer to the section of “Input/Output Functions”. Refer to the section of “Input/Output Functions”. Use this pin open. Refer to the section of “Input/Output Functions”. Refer to the section of “Input/Output Functions”. Use this pin open. — Use this pin open.. Motor coil connection pin Motor coil connection pin Use this pin open. Motor coil connection pin Motor coil connection pin Use this pin open.
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2019-1-31
Input/Output Functions
TC78H651AFNG
IN1
IN2
IN3
IN4
OUT1
OUT2
L
L
—
—
OFF
OFF
H
L
—
—
H
L
L
H
—
—
L
H
H
H
—
—
(Note1)
(Note1)
—
—
L
L
—
—
—
—
H
L
—
—
—
—
L
H
—
—
—
—
H
H
—
—
L
L
L
L
OFF
OFF
Note1: ”H” that is input previously becomes effective. Note: —: Don’t Care
Switching from “IN1 = L / IN2= L” to “IN1 = H / IN2 = H”: Don’t Care Switching from “IN3 = L / IN4= L” to “IN3 = H / IN4 = H”: Don’t Care
OUT3 — — — — OFF H L
(Note1) OFF
OUT4 — — — — OFF L H
(Note1) OFF
Mode Stop Forward Reverse — Stop Forward Reverse — Standby
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2019-1-31
Timing Chart of Output Waveforms
TC78H651AFNG
Input (IN1, IN2, IN3, and IN4)
Output (OUT1, OUT2, OUT3, and OUT4)
50 %
50 %
tpLH
tpHL
10 %
90 % 50 %
90 % 50 %
10 %
tr
tf
Note: Timing charts may be simplified for explanatory purposes.
AC characteristic reference values (VM = 3.0 V, Ta = 25°C)
Symbol
Typ.
Unit
tpLH
90
tpHL
90
ns
tr
20
tf
10
5
2019-1-31
Absolute Maximum Ratings (Ta = 25°C)
TC78H651AFNG
Characteristics
Symbol
Rating
Unit
Power supply voltage Input voltage Output current
Output DMOS body diode forward current
Power dissipation Operation temperature Storage temperature
VM VIN IOUT
If
PD Topr Tstg
8.0
V
-0.3 to 6
V
2.0
A
2.0
A
0.78 (Note 1)
W
-40 to 105
°C
-55 to 150
°C
Note 1: When mounted on a single-side glass epoxy board (50 mm × 50 mm × 1.6 mm, Cu area: 40 %, Cu thickness: 35 μm)
Back-EMF
While a motor is rotating, there is a timing at which power is fed back to the power supply. At that timing, the motor current recirculates back to the power supply due to the effect of the motor back-EMF. If the power supply does not have enough sink capability, the power supply and output pins of the device might rise above the rated voltage (7 V). The magnitude of the motor back-EMF varies with usage conditions and motor characteristics. It must be fully verified that there is no risk that the device or other components will be damaged or fail due to the motor back-EMF. When the power is fed back to the power supply, the body diode of the output DMOS may turn on and a regenerative current may flow. At this time, the voltage applied to the output pin may become a negative value by the voltage of the body diode (Vf). However, if the current of the body diode (If) is a rated value (shown in above table) or less, it is .