Texas Instruments Simple -48V Hot Swap Controller EVM TPS2392EVM TPS2392EVM 데이터 시트

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The full-featured –48-V hot swap controller EVM kit is a two-board platform that enables designers to rapidly
learn about the TPS2392 and TPS2393 operation, and evaluate their performance during hot swap events. The
main evaluation board (TI board number SLUP189–001 or SLUP189–002) is divided into two sections, one
representing the backplane side of a typical telecom system, and the other containing the power interface
section of a hot swap capable plug-in card. On the main EVM PCB, the two subsections are isolated. The EVM
jumper card (TI board number SLUP190), when inserted into the main board’s P1 connector, provides a
mechanism for simulating hot swap events by abruptly applying power, ground and control signals on the
backplane side to their corresponding inputs on the plug-in side.

The full-featured –48-V hot swap controller EVM main board is divided into two separate circuits. When oriented
such that the board nomenclature is upside right to the user, the left side of the board represents the backplane
side of the hot swap interface; the right side represents the plug-in module side. This half contains the power
isolation and control electronics comprising a hot swap interface that may be incorporated in a –48-V hot swap
plug-in board. In addition, the right side of the main board contains some additional switches and components
that can be used to facilitate device testing and for quick modifications of the plug-in characteristics. The two
PCB sections connect to a 44-pin PCB edge connector (P1). Mate and demate of the plug-in is accomplished
by inserting and removing the EVM jumper card.

The backplane side of the main board contains banana jacks for the connection of the –48-V power supply.

The plug-in side of the EVM board contains the TPS2392 or TPS2393 –48-V HSPM device, a power MOSFET
switch, and some configuration capacitors. Two through-hole patterns are provided on the load side for the
installation of large-value aluminum electrolytic capacitors. These capacitors simulate the input bulk
capacitance that may be found on the target module’s back-end supply plane. The EVM is supplied from the
factory with a 100-

µ

F capacitor installed in one of these locations. The second pattern, connected in parallel

with the first, can be used to increase or otherwise modify the amount of load capacitance. With the TPS2392
and TPS2393, both inrush slew rate limiting and a fault time-out period are externally programmable using
capacitors. On the EVM main board, several options are provided for slew rate limiting, for quick comparison
of the effect of capacitor value on this function. The capacitors can be quickly switched in and out of the circuit
via the DIP switch. Fault timing programming is set up in a similar manner; some amount of capacitance is
hard-wired into the circuit, with the option of switching in additional capacitance.

The main board also contains some component patterns and connections to exercise the undervoltage (UVLO),
overvoltage (OVLO), and insertion detection functions, and a switch to toggle the device enable input. Two
possible circuits for interfacing the powergood output are also provided.

Test points are provided throughout the circuit for easy voltage monitoring via oscilloscope or voltmeter. The
test point connections are listed in Table 6.

The pictorial of the full-featured –48-V hot swap EVM top assembly is shown in Figure 1.