TB62208FNG
2011-01-28
9
Electrical Characteristics
(Ta = 25°C, V
M
= 24 V, unless otherwise specified)
Characteristics Symbol
Test
Circuit
Test Condition Min Typ. Max Unit
V
ref
input voltage range V
ref
DC
V
M
= 24 V, STANDBY = H,
outputs enabled, PHASE = 1 kHz
GND 3.0 5.0 V
V
ref
input current I
ref
DC
STANDBY = H
output enabled, V
ref
= 3.0 V
20 35 50
μA
V
ref
decay rate V
ref
(GAIN) DC
STANDBY
= H, output enabled,
V
ref
= 2.0 V
1/4.8 1/5.0 1/5.2 -
TSD threshold (Note 1) T
j
TSD DC V
M
= 24 V 140 155 170 °C
V
M
recovery voltage V
MR
DC
STANDBY
= H 7.0 8.0 9.0 V
Overcurrent trip threshold
(Note 2)
ISD
⎯ － 2.0 3.0 4.0 A
Note 1: Thermal shutdown (TSD) circuitry
When the junction temperature of the device has reached the threshold, the TSD circuitry is tripped, causing the
internal reset circuitry to turn off the output transistors.
The TSD circuitry is tripped at a temperature between 140°C (min) and 160°C (max). Once tripped, the TSD
circuitry keeps the output transistors off until
STANDBY is deasserted High.
Note 2: Overcurrent shutdown (ISD) circuitry
When the output current has reached the threshold, the ISD circuitry is tripped, causing the internal reset circuitry
to turn off the output transistors.
To prevent the ISD circuitry from being tripped due to switching noise, it has a masking time of four CR oscilator
cycles. Once triped, it takes a maximum of four cycles to exit ISD mode and resume normal operation.
The ISD circuitry remains active until the
STANDBY pin is changed from Low to High again.
The TB62208FNG remains in Standby mode while in ISD mode.
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 TB62208FNG 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.
・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 in the wrong orientation or incorrectly. Otherwise, it may cause the device breakdown,
damage and/or deterioration.
