參數(shù)資料
型號(hào)： TB62214FTG
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 2 A, PQCC48
封裝： 7 X 7 MM, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, QFN-48
文件頁(yè)數(shù)： 7/27頁(yè)
文件大?。?/td> 687K
代理商： TB62214FTG
TB62214FG/FTG
2010-06-10
15
Output Transistor Operating Modes
CLK
U1
U2
L1
L2
Charge
ON
OFF
ON
Slow-decay Mode
OFF
ON
Fast-decay Mode
OFF
ON
OFF
Note: This table shows an example of when the current flows as indicated by the arrows in the figures shown above.
If the current flows in the opposite direction, refer to the following table.
CLK
U1
U2
L1
L2
Charge
OFF
ON
OFF
Slow-decay Mode
OFF
ON
Fast-decay Mode
ON
OFF
ON
The TB62214FG/FGT switches among Charge, Slow-Decay and Fast-Decay modes automatically for
constant-current control.
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory
purposes.
Calculation of the Predefined Output Current
For PWM constant-current control, the TB62214FG/FTG uses a clock generated by the CR oscillator. The peak
output current can be set via the current-sensing resistor (RRS) and the reference voltage (Vref), as follows:
IOUT = Vref/5 ÷ RS (Ω)
where, 1/5 is the Vref decay rate, Vref (GAIN). For the value of Vref (GAIN), see the Electrical Characteristics table.
For example, when Vref
= 3 V, to generate an output current (IOUT) of 0.8 A, RRS is calculated as:
RRS = (Vref /5) ÷ IOUT = (3/5) ÷ 0.8 = 0.75Ω. (≥ 0.5 W)
U1
L1
U2
L2
OFF
U1
L1
U2
L2
OFF
ON
Load
U1
L1
U2
L2
Load
PGND
RS Pin
RRS
VM
ON
Load
Charge Mode
A current flows into the motor
coil.
Slow-Decay Mode
A current circulates around the
motor coil and this device.
Fast-Decay Mode
The energy of the motor coil
is fed back to the power
ON
RS Pin
OFF
ON
OFF
VM
RRS
PGND
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