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參數(shù)資料
| 型號(hào)： | UCC1917 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Positive Floating Hot Swap Power Manager |
| 中文描述： | 積極浮動(dòng)熱插拔電源管理器 |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大小： | 228K |
| 代理商： | UCC1917 |
UCC1917
UCC2917
UCC3917
SLUS203A - AUGUST 1999
FEATURES
Manages Hot Swap of 15V 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 NMOS Device
Fault Output and Catastrophic
Fault Indication
Fault Mode Programmable to
Latch or Retry
Shutdown Control
Undervoltage Lockout
Positive Floating Hot Swap Power Manager
12
11
8
7
6
5
10
4
2
3
1
13
16
9
15
14
5V
VDD
VOUT
V
DD
VOUT
DISABLE
OUTPUT
LOW
ON-TIME
DELAY
V
DD
40
μ
A
VOUT
UVLO
>10V=ENABLE
< 6V=DISABLE
5V
REFERENCE
LOGIC
SUPPLY
SHTDWN
FLTOUT
C1P
C1N
C2P
C2N
VSS
VREF/CATFLT
MAXI
CT
VOUT
SENSE
OUTPUT
PLIM
LATCH
VDD
+
200mV
OVER
CURRENT
COMPARATOR
40
μ
A
+
50mV
4V
BLOCK DIAGRAM
UDG-99055
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.
application
INFO
available
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UCC1919 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:3V to 8V Hot Swap Power Manager |
| UCC1919J | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Power Control/Management |
| UCC1921 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Latchable Negative Floating Hot Swap Power Manager |
| UCC1921J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| UCC1926 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:【 20A Integrated Current Sensor |
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