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參數(shù)資料
| 型號(hào)： | LV8747T |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.75 A SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封裝： | 7 X 7 MM, TQFP-64 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大小： | 228K |
| 代理商： | LV8747T |
LV8747T
No.A0695-18/21
Output short-circuit protection circuit
To protect 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 the standby mode is incorporated.
(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.
OCPM
State
“Low”
Auto reset method
“High”
Latch method
(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 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 256s (TYP). In this event, if the over-current mode still
continues, the above switching mode is repeated till the over-current mode is canceled.
(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”
(2) OCP pin constant setting method (timer latch setting)
Connect C between the OCP pin and GND, and the time up to the output OFF can be set in case of output short-circuit.
The C value can be determined as follows :
Timer latch : Tocp
Tocp
≈ C × V/I [s]
V : Threshold voltage TYP 1V
I : OCP charge current TYP 20
A
(C: Recommended constant value 100pF to 200pF)
ON
1V
OCP voltage
Output current
Exceeding the
over-current
detection
current
OFF
0.5 to 1
s
256
s (TYP)
OFF
ON
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