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UCC1917 Datasheet

  • UCC1917

  • Positive Floating Hot Swap Power Manager

  • 9頁

  • TI

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application
INFO
available
UCC1917
UCC2917
UCC3917
Positive Floating Hot Swap Power Manager
FEATURES
鈥?/div>
Manages Hot Swap of 15V and
Above
鈥?/div>
Precision Fault Threshold
鈥?/div>
Programmable Average Power
Limiting
鈥?/div>
Programmable Linear Current
Control
鈥?/div>
Programmable Overcurrent Limit
鈥?/div>
Programmable Fault Time
鈥?/div>
Internal Charge Pump to Control
External NMOS Device
鈥?/div>
Fault Output and Catastrophic
Fault Indication
鈥?/div>
Fault Mode Programmable to
Latch or Retry
鈥?/div>
Shutdown Control
鈥?/div>
Undervoltage Lockout
DESCRIPTION
The UCC3917 family of positive floating hot swap managers provides complete
power management, hot swap, and fault handling capability. The voltage limita-
tion of the application is only restricted by the external component voltage limi-
tations. The IC provides its own supply voltage via a charge pump off of VOUT.
The onboard 10V shunt regulator protects the IC from excess voltage. The IC
also has catastrophic fault indication to alert the user that the ability to shut off
the output NMOS has been bypassed. All control and housekeeping functions
are integrated and externally programmable. These include the fault current
level, maximum output sourcing current, maximum fault time, soft start time,
and average NMOS power limiting.
The fault level across the current sense amplifier is fixed at 50mV to minimize
total drop out. Once 50mV is exceeded across the current sense resistor, the
fault timer will start. The maximum allowable sourcing current is programmed
with a voltage divider from the VREF/CATFLT pin to generate a fixed voltage
on the MAXI pin. The current level at which the output appears as a current
source is equal to V
MAXI
divided by the current sense resistor. If desired, a con-
trolled current startup can be programmed with a capacitor on MAXI.
When the output current is below the fault level, the output device is switched
on with full gate drive. When the output current exceeds the fault level, but is
less than maximum allowable sourcing level programmed by MAXI, the output
remains switched on, and the fault timer starts charging CT. Once CT charges
to 2.5V, the output device is turned off and attempts either a retry sometime
later or waits for the state on the LATCH pin to change if in latch mode. When
the output current reaches the maximum sourcing current level, the output de-
vice appears as a current source.
VDD
13
V
DD
40碌A(chǔ)
UVLO
>10V=ENABLE
< 6V=DISABLE
LATCH
16
1
V
DD
40碌A(chǔ)
5V
VDD
DISABLE
VOUT
VOUT
OUTPUT
LOW
3
OUTPUT
PLIM
BLOCK DIAGRAM
SHTDWN 12
VOUT
FLTOUT 11
C1P
8
5V
REFERENCE
LOGIC
SUPPLY
OVER
CURRENT
COMPARATOR
ON-TIME
DELAY
50mV
+
2
4
SENSE
VOUT
C1N
7
C2P
6
+
4V
10 CT
C2N
5
200mV
9
VSS
15
VREF/CATFLT
14
UDG-99055
MAXI
SLUS203A - AUGUST 1999

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