TPS2346
SLUS529 MAY 2002
11
www.ti.com
detailed description (continued)
The basic functional blocks of the LCA/voltage sense circuits is shown in greater detail in Figure 2. The LCA
has as its inputs the reference voltage generated by the current sources, and the current sense input. During
a supply turn-on, it slews the pass MOSFET gate to force the load current to track the selected source. After
load charging completes, and the current decays to the nominal operating level, the LCA drives the GATEx
output to its input supply level, the charge pump output voltage.
UDG02004
+
R
LCA
OCA
OV
UV
UV
OV
R
DAC
DAC
5
5
REF_Vx
VSEL
VINx
CSx
VSx
GATEx
OCx
UVOVx
MUX
2:1
V
CPUMP
V
IMAX
IRAMP
10
V
INX
Figure 2. Linear Control Amplifier Block
The supply voltage is monitored by the undervoltage (UV) and overvoltage (OV) comparators. A voltage
multiplexer (MUX) selects from either the input supply voltage (VINx) or the load voltage (VSx), and provides
that signal to the comparator inputs. Once the Channel 1 supply is above the UVLO threshold, and the ENABLE
input has been pulled low, but prior to the ramp-up of the first channel, the comparators monitor the input
supplies. Any supply outside its UV/OV window causes all pass MOSFETs to be held off. If all inputs are within
tolerance, a ramp-up sequence can start, at which time the comparator inputs are switched over to the load,
or VSx, voltages. Within the state machine, monitoring of the ORed status of the UV and OV comparators of
any channel is enabled at the turn-on of the next channel, or approximately at the leading edge of the next
IRAMP pulse.
Finally, a fast overcurrent comparator (OCA in the diagram) also monitors the CSx input. This comparator
threshold is set to approximately 2 times the current limit threshold, (2 ?IMAX) for the three positive supplies.
In the event of a short-circuit or other fast overcurrent event, the OCA trips, disabling the LCA, and causing
additional gate discharge paths to be turned on for a rapid shutdown of the loads.
A 1-礢 to 2-礢 filter is applied to all overcurrent and voltage faults to guard against nuisance trips. If the duration
of a fault condition on any one channel exceeds the filter length, the fault is latched, the open-drain device at
the PG
output is turned off, and all four channels are shut down.
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