Datasheet

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TPS23750
TPS23770
SLVS590B – JULY 2005 – REVISED FEBRUARY 2008
TMR controls softstart, overload time-out, and automatic restart on overload, which is referred to as a hiccup
function.
V
BIAS
– This 5-V bias supply powers the bulk of the converter functions. V
BIAS
can be used to power the
feedback optocoupler in isolated applications. External loading should be minimized to avoid excessive power
dissipation. V
BIAS
has a UVLO function that inhibits converter operation at outputs of less than 4.6 V. V
BIAS
should
be bypassed with a capacitor between 0.08 µ F and 1.5 µ F. Do not apply external bias to this pin.
V
DD
– This is the positive power pin to the IC.
V
SS
– Common ground for the internal PoE circuits. This pin is connected to the low side of the rectified PoE
voltage. An internal power MOSFET connects RTN to V
SS
under control of the PoE section. The PowerPAD on
the bottom of the package is internally connected to V
SS
. The PowerPAD is used to remove heat from the die
through the PCB.
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