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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)： | 4/24頁 |
| 文件大?。?/td> | 463K |
| 代理商： | TB62218FNG |
TB62218FNG
2010-10-07
12
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 TB62218FNG 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 TB62218FNG 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 ÷ RRS (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 = 0.75 Ω (≥ 0.5 W)
U1
L1
U2
L2
PGND
OFF
U1
L1
U2
L2
OFF
ON
Load
PGND
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 supply.
ON
RS Pin
RRS
RS Pin
RRS
OFF
ON
OFF
VM
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TB62225SM2 | 制造商:THOMAS & BETTS 功能描述: |
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