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參數(shù)資料
| 型號： | STK6877 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Reversible Brush-Type DC Motor Driver (output current: 8 A)(可逆DC電刷型電機(jī)驅(qū)動器（輸出電流為8A）) |
| 中文描述： | 可逆刷式直流電機(jī)驅(qū)動器（輸出電流：8甲）（可逆直流電刷型電機(jī)驅(qū)動器（輸出電流為8A）條） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 124K |
| 代理商： | STK6877 |
2. Hybrid IC Internal Average Power Dissipation (Pd)
Of the power dissipations within the hybrid IC, the following components have large power dissipations: the FETs that
are the upper PWM elements in the H bridge structure, the lower FETs that form the motor direction reversing loop, and
the flywheel FET body diode. This can be expressed as shown below from experiment (from the output current
waveform in the figure below).
Pd = upper FETs + lower FETs + body diode losses
= Vst
×
I
M
×
fp
×
t
ON
+ Vst
×
I
M
+ Vdf
×
I
M
×
fp
×
t
OFF
Vst: FET saturation voltage (V)
I
M
:
Motor output current (A)
Vdf: FET body diode forward voltage (V)
fp:
Chopping frequency (Hz)
Figures 5 and 6 show the I
O
vs. Vst and I
O
vs. Vdf characteristics.
3. Junction Temperature, Tj
The junction temperatures Tj (°C) for each element (F1, F2,
F3 and F4) can be derived from the formula below from the
power dissipation Pds (W) for each element and the
junction thermal resistances
θ
j-c (°C/W).
Tj = Tc +
θ
j-c
×
Pds (°C)
Pds: Loss per element
Note that the thermal resistances for the power elements are
as follows.
F1, F2, F3, F4
θ
j-c = 4 (°C/W)
No. 4874-4/8
STK6877
F1, F2, F3, F4, ASO
Ta = 25°C
1 pulse
Figure 3 I
M
Waveform Model
Figure 4 Model Circuit Diagram
Figure 5 I
O
vs. Vst
Figure 6 I
O
vs. Vdf
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