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參數(shù)資料
| 型號： | UCC1921 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Latchable Negative Floating Hot Swap Power Manager |
| 中文描述： | 鎖存負(fù)浮動熱插拔電源管理器 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 497K |
| 代理商： | UCC1921 |
3/98
FEATURES
Precision Fault Threshold
Programmable:
Average Power Limiting, Linear
Current Control, Overcurrent Limit
and Fault Time
Fault Output Indication Signal
Automatic Retry Mode or Latched
Operation Mode
Shutdown Control
Undervoltage Lockout
250
μ
s Glitch Filter on the SDFLTCH
pin
8-Pin DIL and SOIC
Latchable Negative Floating Hot Swap Power Manager
BLOCK DIAGRAM
UCC1921
UCC2921
UCC3921
UDG-99052
DESCRIPTION
The UCC3921 family of negative floating hot swap power managers pro-
vides complete power management, hot swap, and fault handling capa-
bility. The IC is referenced to the negative input voltage and is powered
through an external resistor connected to ground, which is essentially a
current drive as opposed to the traditional voltage drive. The onboard
10V shunt regulator protects the IC from excess voltage and serves as a
reference for programming the maximum allowable output sourcing cur-
rent during a fault. All control and housekeeping functions are integrated
and externally programmable. These include the fault current level, maxi-
mum output sourcing current, maximum fault time, selection of Retry or
Latched mode, soft start time, and average power limiting. In the event of
a constant fault, the internal timer will limit the on time from less than
0.1% to a maximum of 3% duty cycle. The duty cycle modulation de-
pends on the current into PL, which is a function of the voltage across
the FET, thus limiting average power dissipation in the FET. The fault
level is fixed at 50mV across the current sense amplifier to minimize total
(continued)
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