UCC3917D Datasheet, PDF (1/25 Pages) Texas Instruments – Positive Floating Hot-Swap Power Manager

Obsolete Devices
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UCC2917
UCC3917
SLUS203D – FEBRUARY 2000 – REVISED MAY 2013
Positive Floating Hot-Swap Power Manager
Check for Samples: UCC2917, UCC3917
FEATURES
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• Manages Hot-Swap of 15 V and Above
• Precision Fault Threshold
• Programmable Average Power Limiting
• Programmable Linear Current Control
• Programmable Overcurrent Limit
• Programmable Fault Time
• Internal Charge Pump to Control External N-
channel MOSFET Device
• Fault Output and Catastrophic Fault Indication
• Fault Mode Programmable to Latch or Retry
• Shutdown Control
• Undervoltage Lockout
APPLICATIONS
• 390-V DC Distribution
• General High-Voltage Power Management
DESCRIPTION
The UCCx917 family of positive-floating hot-swap
managers provides complete power management,
hot-swap, and fault handling capability. The voltage
limitation of the application is only restricted by the
external component voltage limitations. The device
provides its own supply voltage via a charge pump
referenced to VOUT. The onboard 10-V shunt
regulator protects the device from excess voltage.
The devices also have catastrophic fault indication to
alert the user that the ability to shut off the output N-
channel MOSFET 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 N-channel
MOSFET power limiting.
The fault level across the current-sense amplifier is
fixed at 50 mV to minimize total drop out. Once 50
mV is exceeded across the current-sense resistor,
the fault timer starts. 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 controlled 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 the timing
capacitor C_T. Once C_T charges to 2.5 V, 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 device appears as a current source.
ORDERING INFORMATION
T_J
PACKAGED DEVICES
DIP (J)
DIP (N) SOIC (D)
–40°C to 85°C
UCC2917J UCC2917N UCC2917D
0°C to 70°C
UCC3917J UCC3917N UCC3917D
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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