Datasheet

FBU

FBL

TLV431

From Regulated

Output Voltage

TPS23751

TPS23752

www.ti.com

SLVSB97C –JULY 2012–REVISED JANUARY 2014

Figure 33. Error Amplifier Soft Start

Special Switching MOSFET Considerations

Special care must be used in selecting the converter switching MOSFET. The TPS23751 and TPS23752

minimum switching MOSFET V

GATE

is approximately 5.5 V, which is due to the V

lower threshold. This condition

occurs during an output overload, or towards the end of a (failed) bootstrap startup. The MOSFET must be able

to carry the anticipated peak fault current at this gate voltage.

Thermal Considerations and OTSD

Sources of nearby local PCB heating should be considered during the thermal design. Typical calculations

assume that the TPS23751 and TPS23752 are the only heat sources contributing to the PCB temperature rise. It

is possible for a normally operating TPS23751 or TPS23752 device to experience an OTSD event if it is

excessively heated by a nearby device.

ESD

ESD requirements for a unit that incorporates the TPS23751 or TPS23752 have a much broader scope and

operational implications than are used in TI testing. Unit-level requirements should not be confused with

reference design testing that only validates the ruggedness of the TPS23751 and TPS23752.

Layout

Printed circuit board layout recommendations are provided in the evaluation module (EVM) documentation

available for the devices.

Product Folder Links: TPS23751 TPS23752