Datasheet

IN
10 Fm
TPS75005
EN
Sequencer
TPS75005
www.ti.com SBVS144C –NOVEMBER 2011–REVISED APRIL 2012
Undervoltage Lockout (UVLO)
The TPS75005 uses an undervoltage lockout (UVLO) circuit to keep the output shut off until the internal circuitry
is operating properly. The UVLO circuit has a hysteresis feature so that short undershoot transients are typically
ignored.
See Figure 11 for the actual measurement. See the section for how to set a custom threshold voltage for the
input voltage.
Within the TPS75005, UVLO is combined with EN to create an internal enable signal. A logic AND operation of
the EN input signal and internal UVLO signal is used to control the sequencer. By connecting EN to VIN, a logic
input buffer for the EN and UVLO circuit refer to the same electric node and the device can be controlled by
UVLO function because V
UVLO
is greater than V
IH(EN)
. Figure 29 shows how to control the TPS75005 without a
signal source to the EN pin.
Figure 29. TPS75005 without EN Signal Control
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Product Folder Link(s): TPS75005