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STELPD01 датащи(PDF) 11 Page - STMicroelectronics

номер детали STELPD01
подробное описание детали  Electronic load switch for power line
PDF  27 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STELPD01 датащи(HTML) 11 Page - STMicroelectronics

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Figure 7. EN/Fault driver circuit
5 V
STELPD01
30 μA
Fault driver
Fault signal
GND
VI(INT)ref
UVLO
EN/Fault
ON/OFF Comparator
To the logic control block
GND
Pull down block
VREF
6.8
External gate driver function for reverse blocking
The STELPD01 provides a dedicated gate drive signal on the VG pin which can be used to control an external
blocking MOSFET for reverse-current protection (RCP). See Figure 4.
When the internal control circuitry is enabled to perform output start-up ramp, the Vgate pin is pulled up by
External FET charging current IFET to the charge pump voltage referred to the Vin voltage in order to guarantee
the activation of external FET.
If the input voltage reaches Vclamp threshold the Vgate voltage is also clamped to a safe value of Vout + 5.5 V. See
Figure 23.
Reverse current protection is activated in case VIN falls below the undervoltage lockout (UVLO), the enable (EN)
voltage falls below the low-level threshold, or a fault event occurs.
For example, as VCC drops during input power removal, the device turn off internal FET and it sinks current from
the gate of the external FET to quickly turn it off, therefore blocking any current flow from the load to the input
side.
STELPD01
External gate driver function for reverse blocking
DS13254 - Rev 1
page 11/27



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