TB67H400AHG
2016-12-22
Electrical characteristics 2 (Ta=25°C and VM=24 V, unless otherwise specified)
Characteristics Symbol Test conditions Min Typ. Max Unit
Vref input current
Internal regulator voltage
Internal regulator current
Vref gain rate
Vref(gain) Vref=2.0 V 1/5.2 1/5.0 1/4.8 ―
TSD threshold (Note1)
VM power on reset voltage
Over current threshold (Note2)
Note1: Thermal shutdown (TSD) circuit
When the junction temperature of the device reaches the TSD threshold, the TSD circuit is triggered; the
internal reset circuit then turns off the output transistors. In order to avoid malfunction by switching etc.,
detection mask time is prepared inside IC. Once the TSD circuit is triggered, the device will be set to standby
mode, and can be cleared by reasserting the VM power source, or setting to standby mode (INA1, INA2, INB1,
INB2, PWMA, and PWMB=All Low). The TSD circuit is a backup function to detect a thermal error, therefore
is not recommended to be used aggressively.
Note2: Over-current shutdown (ISD) circuit
When the output current reaches the threshold, the ISD circuit is triggered; the internal reset circuit then
turns off the output transistors. In order to avoid malfunction by switching etc., detection mask time is
prepared inside IC. Once the ISD circuit is triggered, the device will be set to standby mode, and can be
cleared by reasserting the VM power source, or setting to standby mode (INA1, INA2, INB1, INB2, PWMA,
and PWMB=All Low).
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 TB67H400AHG 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.
