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參數(shù)資料
| 型號： | TB62218FNG |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO48 |
| 封裝： | 0.300 INCH, 0.50 MM PITCH, PLASTIC, TSSOP-48 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大?。?/td> | 463K |
| 代理商： | TB62218FNG |
TB62218FNG
2010-10-07
8
Electrical Characteristics 2 (Ta = 25°C, VM = 24 V, unless otherwise specified)
Characteristics
Symbol
Test
Circuit
Test Condition
Min
Typ.
Max
Unit
Vref input current
Iref
DC
Vref = 3.0 V
-
0
1
μA
Vref decay rate
Vref (GAIN)
DC
Vref = 2.0 V
1/4.8
1/5.0
1/5.2
TSD threshold
(Note 1)
TjTSD
DC
140
150
170
°C
VM recovery voltage
VMR
DC
7.0
8.0
9.0
V
Overcurrent trip threshold
(Note 2)
ISD
DC
2.0
3.0
4.0
A
Supply voltage for internal circuitry
VCC
DC
ICC = 5.0 mA
4.75
5.00
5.25
V
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 170°C (max). Once tripped, the TSD
circuitry keeps the output transistors off until STANDBY is deasserted High or the IC is restarted. The thermal
shutdown circuit is provided to turn off all the outputs when the IC is overheated. For this reason, please avoid
using TSD for other purposes.
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
oscillator cycles. Once tripped, 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 or the IC is
restarted.
The TB62218FNG remains in Standby mode while in ISD mode.
Note 3: If the supply voltage for internal circuitry (VCC) is split with an external resistor and used as Vref input supply
voltage, the accuracy of the output current setting will be at
±8% when the Vcc output voltage accuracy and the
Vref damping ratio accuracy are combined.
Note 4: The circuit design has been designed so that electromotive force or leak current from signal input does not
occur when VM voltage is not supplied, even if the logic input signal is input. Even so, regulate logic input
signals before resupply of VM voltage so that the motor does not operate when voltage is reapplied.
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 TB62218FNG 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 the breakdown, damage
and/or deterioration of the device.
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