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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)： | 5/8頁 |
| 文件大?。?/td> | 124K |
| 代理商： | STK6877 |
Usage Notes
1. Drive Circuit Start-up Procedure
Figure 7 Upper and Lower MOSFET Drive Circuits
When starting (applying power to) the driver circuit (STK6877), the external control signals must be set to standby
mode, i.e., pins A and B both set to low (setting both these pins high is an illegal mode). Then, after the specified power
supply voltages (V
CC
1 and V
CC
2) have been input to the driver circuit, the circuit can be driven by inputting external
control signals.
2. Illegal Input Mode with both the A and B Phase Signals (pins 13 and 15) High
Since the circuit operation problems described below occur when the input signal mode with both signals high is used,
this mode should be avoided.
2-1 If used in the standby state, the voltage (Vch) charged on the external bootstrap capacitor (47 μF/16 V) will drop to
an inadequate level. As a result, when the STK6877 driver circuit is switched to the start-up state, an insufficient
drive voltage state for the upper FETs (F1 and F2) will occur.
2-2 If the A and B phase input signals are both switched to the high level in the motor start-up state (CW or CCW
mode), a current loop (braking current) will be created in the upper side FETs due to the motor energy. At this
point, since the upper FET drive voltage (the V
GS
voltage) drops, an insufficient drive state will occur in the upper
FETs, and they may be destroyed. However, if during this operation the charge voltages Vch across the two
terminals of the bootstrap capacitors (47 μF/16 V) are monitored at the following points:
x
The voltage between pin 10 and pin 8 (or 9)......................................Phase A...................(1)
y
The voltage between pin 1 and pin 4 (or 5)........................................Phase B
and if both these voltages can be maintained at 4.0 V or higher, then the A and B phase pin input signals can both
set to high safely. In other words, if the A and B phase pin input signal mode with both signals high is used as a
motor stopping technique, care must be taken to assure that the charge voltages Vch on the external bootstrap
capacitors meet this condition.
3. Handling the Hybrid IC’s PG (pins 2 and 3) and SG Pins (pin 12)
Basically, the PCB pattern must be designed so that the PG and SG pins connect to a single grounding point. Also, if a
current detection resistor (R
E
) is inserted on the PG pin, handle the PG and SG pins as shown in Figure 8, i.e., connect
them to a single grounding point, and select a value of the resistor R
E
so that the voltage drop V
RE
meets the following
condition.
V
RE
= (I
OH
×
R
E
)
≤
0.5 V...................................................(2)
I
OH
:
R
E
:
V
RE
: Voltage drop across R
E
(V)
Motor output current (A)
Current detection resistance(
)
The condition specified by formula (2) is specified in the
specifications as the sensing voltage Vsens.
No. 4874-5/8
STK6877
Figure 8 Handling for the PG and SG Pins
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