參數(shù)資料
型號(hào)： LV8746V
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, 1.2 A, PDSO44
封裝： 0.275 INCH, SSOP-44
文件頁(yè)數(shù)： 13/24頁(yè)
文件大小： 400K
代理商： LV8746V
LV8746V
Output short-circuit protection function
This IC incorporates an output short-circuit protection circuit that, when the output has been shorted by an event such
as shorting to power or shorting to ground, to prevent the thing that IC destroys, the output short-circuit protection
circuit that turns off the output is built into.
(1) Protection function operation(Latch type)
The detection of the output short-circuited state by the IC causes the output short-circuit protection circuit to be
activated.
When the short-circuited state continues for the period of time set using the internal timer (approximately 4
μs), the
output in which the short-circuiting has been detected is first set to OFF. After this, the output is set to ON again as
soon as the timer latch time (Tcem) described later has been exceeded, and if the short-circuited state is still detected,
all the outputs of the channel concerned are switched to the standby mode, and this state is held.
This state is released by setting ST to low.
4
μs
Short-circuit
Short-
circuit
Short-circuit
detection state
CEM voltage
H-bridge
output state
Internal counter
1st counter
start
1st counter
stop
1st counter
start
1st counter
end
2nd counter
start
2nd counter
end
Release
Threshold voltage
Output OFF
Output ON
Standby state
(2) Unusual condition warning output pins (EMO)
IC is provided with the EMO pin which notifies the CPU of an unusual condition if the protection circuit operates by
detecting an unusual condition of the IC. This pin is of the open-drain output type and when an unusual condition is
detected, the EMO output is placed in the ON (EMO = Low) state.
Furthermore, the EMO pin is placed in the ON state when one of the following conditions occurs.
1. Shorting-to-power, shorting-to-ground, or shorting-to-load occurs at the output pin and the output short-circuit
protection circuit is activated.
2. The IC junction temperature rises and the thermal protection circuit is activated.
(3) Timer latch time (Tcem)
The time taken for the output to be set to OFF when the output has been short-circuited can be set using capacitor
Ccem, connected between the CEM pin and GND. The value of capacitor Ccem is determined by the formula given
below.
Timer latch : Tcem
Tcem
≈ Ccem × Vtcem/Icem [sec]
Vtcem : Comparator threshold voltage, typ 1V
Icem : CEM pin charge current, typ 10
μA
No.A1563-20/24
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