Data Sheet

TB67S249FTG
2017-08-18
21
Electrical characteristics 2 (Ta = 25°C and VM = 24 V, unless otherwise specified)
Characteristics
Symbol
Test condition
Min
Typ.
Max
Unit
VREF input current
IREF
VREF=2.0 V
—
0
1
μ
A
VCC voltage VCC ICC=5.0 mA 4.75 5.0 5.25 V
VCC current
ICC
VCC=5.0 V
—
2.5
5.0
mA
VREF gain
VREF (gain)
VREF=2.0 V
—
1.25
—
A/V
Thermal shutdown (TSD) threshold (Note1)
T
j
TSD
—
145
160
175
°C
VM power-on-reset threshold
VMPOR (H)
POR release 6.5 7.5 8.5 V
VMPOR (L)
POR detect
6.0
7.0
8.0
V
Over current protection (ISD) threshold
(Not2)
ISD — 5.0 6.0 7.0 A
Note 1: Thermal shutdown (TSD)
When the junction temperature of the IC reaches the specified value, the internal detection circuit operates to turn off the
output block. The dead band time is provided in the IC to avoid the malfunction caused by switching and so on. While TSD
works, the operation of the IC is in the standby mode. To release the shutdown circuit, apply the power supply again or
configure the standby mode by DMODE pin. TSD function works when the IC is heated abnormality. Use the IC with the
appropriate environment not to operate the TSD function often.
Note 2: Over current protection (ISD)
When the current, which exceeds the specified value, flows in the motor output, internal detection circuit operates and the
operation of the output block is turned off. The dead band time is provided in the IC to avoid the malfunction caused by
switching and so on. While ISD works, the operation of the IC is in the standby mode. To release the ISD protection, apply
the power supply again or configure the standby mode by DMODE pin.
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 voltages. 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 TB67S249FTG or other components will be damaged or fail due to the motor
back-EMF.
Cautions on Overcurrent Shutdown (ISD) and Thermal Shutdown (TSD)
The ISD and TSD circuits are only intended to provide temporary protection against irregular conditions such as an output
short-circuit; they do not necessarily guarantee the complete IC safety.
If the device is used beyond the specified operating ranges, these circuits may not operate properly: then the device may be
damaged due to an output short-circuit.
The ISD circuit is only intended to provide a temporary protection against an output short-circuit. If such a condition persists
for a long time, the device may be damaged due to overstress. Overcurrent conditions must be removed immediately by
external hardware.
IC Mounting
Do not insert devices incorrectly or in the wrong orientation. Otherwise, it may cause breakdown, damage and/or
deterioration of the device.