R5421N152C-TR View Datasheet(PDF) - RICOH Co.,Ltd.
Part Name
Description
Manufacturer
R5421N152C-TR Datasheet PDF : 19 Pages
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q VD3/Excess Current Detector, Short Circuit Protector
Both of the excess current detector and short circuit protector can work when both control FETs are in “ON” state.
When the V- pin voltage is going up to a value between the short protection voltage Vshort /VDD and excess current
threshold VDET3, the excess current detector operates and further soaring of V- pin voltage higher than Vshort makes the
short circuit protector enabled. This leads the external discharge control Nch MOS FET turns to “OFF” with the DOUT pin
being at “Low” level.
An output delay time for the excess current detector is internally fixed, 13ms typ. at VDD=3.0V.
A quick recovery of V- pin level from a value between Vshort and VDET3 within the delay time keeps the discharge control
FET staying “High” state.
When the short circuit protector is enabled ,the DOUT would be Low and its delay time would be 5µs typ.
The V - pin has a built-in pulled down resistor ,typ.100kΩ, with connecting to the VSS pin.
After an excess current or short circuit protection is detected, removing a cause of excess current or external short circuit
makes an external discharge control FET to an “ON” state automatically with the V- pin level being down to the VSS level
through pulled down resistor built-in internally.
If VDD voltage would be higher than VDET2 at a time when the excess current is detected the R5421NxxxC does not enter a
standby mode, or otherwise in case of lower VDD voltage than VDET2 would lead the R5421NxxxC into a standby.
After detecting short circuit the R5421NxxxC will not enter a standby mode.
Rev.1.11
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