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參數(shù)資料
| 型號(hào)： | LV8741V |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.75 A, PDSO44 |
| 封裝： | 0.275 INCH, SSOP-44 |
| 文件頁數(shù)： | 13/25頁 |
| 文件大?。?/td> | 204K |
| 代理商： | LV8741V |
LV8741V
No.A0814-20/25
Output short-circuit protection circuit
To protect the IC from damage due to short-circuit of the output caused by lightening or ground fault, the output
short-circuit protection circuit to put the output in standby mode and turn on the alarm output is incorporated. Note
that when the RF pin is short-circuited to GND, this output short-circuit protection is not effective against shorting to
power.
(1) Output short-circuit protection operation changeover function
Changeover to the output short-circuit protection of IC is made by the setting of OCPM pin.
EMM
State
Low or Open
Auto reset method
High
Latch method
(2) Auto reset method
When the output current is below the output short-circuit protection current, the output is controlled by the input
signal. When the output current exceeds the detection current, the switching waveform as shown below appears
instead.
(When a 20k
resistor is inserted between RCHOP and GND)
When detecting the output short-circuit state, the short-circuit detection circuit is activated.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode and reset to the ON mode again in 256
s (TYP). In this event, if the overcurrent mode still
continues, the above switching mode is repeated till the overcurrent mode is canceled.
(3) Latch method
Similarly to the case of automatic reset method, the short-circuit detection circuit is activated when it detects the
output short-circuit state.
When the short-circuit detection circuit operation exceeds the timer latch time described later, the output is changed
over to the standby mode.
In this method, latch is released by setting PS = “L”
(4) Output short-circuit condition warning output pin
EMO, warning output pin of the output short-circuit protection circuit, is an open-drain output.
EMO outputs ON when output short-circuit is detected.
ON
1V
OFF
1 to 2
s
Tscp
256
s (TYP)
OFF
ON
OCP voltage
Output current
Exceeding the
over-current
detection
current
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