Datasheet

SLUU155 – March 2003
15
Full-Featured –48-V Hot Swap Power Manager
4 Using the EVM Kit to Evaluate the TPS2392 and TPS2393
Procedures similar to the steps of Section 3.2.2 for functional test of the EVM can also be used to continue
evaluation of the TPS2392 and TPS2393 hot swap controller devices. Additional details about the EVM features
are provided in this section.
4.1 Supply Connections and Test Points
Supply connections to the EVM should be made as shown in Figure 5. The backplane, 48-V supply (power
supply number 1 in Figure 5) connects to J1 and J2. The polarity of the circuit is such that the HI or (+) output
of the supply connects to J1, –48V_RTN. The LO or (–) jack connects to J2, –48V_IN. PCB header J5 (VS) is
used to connect an external pull-up source when using the EN1
and EN2 outputs of the module. This supply
is referenced to the VOUT– node.
The full-featured –48-V hot swap EVM contains numerous test points located throughout the circuit for
waveform monitoring. A list of the EVM test points and their associated signals is given in Table 6.
Table 6. Full-Featured –48-V Hot Swap EVM Test Points
TEST POINT SIGNAL NAME DESCRIPTION
TP1 UVLO Sense input for supply undervoltage detection.
TP2 INSA Insertion detection input A.
TP3 INSB Insertion detection input B.
TP4 FAULT
Load fault output of the TPS2392/93. On the EVM, this signal drives the
red LED.
TP5 EN Device enable input to turn on/off power to the load.
TP6 FLTTIME Fault timing waveform of the TPS2392/93.
TP7 IRAMP Current ramp control output waveform.
TP8 –VIN
Negative supply input and reference pin for the TPS2392/93. On the
EVM, this is connected to –48V_IN when the Jumper Card is inserted.
TP9 ISENS Current sense input of the controller.
TP10 GATE Gate drive for pass FET Q1.
TP13 DRNSNS Sense input of the controller for load voltage status.
TP14 OVLO Sense input for supply overvoltage detection.
TP15 –VIN
Secondary test point on device reference node (located near timing
capacitors).
TP16
VOUT
Additional suppl
y
hi
g
h side test points
(
located on input side of board
,
TP17
VOUT+
Additional
su ly
high
side
test
oints
(located
on
in ut
side
of
board
,
near TPS2392/93 power pin).
TP18
VIN
Secondar
y
ne
g
ative suppl
y
input test points. On the EVM
,
these are
TP19
–VIN
Secondary
negative
su ly
in ut
test
oints
.
On
the
EVM
,
these
are
connected to –48V_IN when the Jumper Card is inserted.
TP20
VOUT
High side of s itched (load) o tp t po er
TP21
VOUT+ High side of switched (load) output power.
TP22
VOUT
Lo side of s itched (load) o tp t po er
TP23
VOUT– Low side of switched (load) output power.