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參數(shù)資料
| 型號： | UC3902DTRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, SOIC-8 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 293K |
| 代理商： | UC3902DTRG4 |
UC2902
UC3902
SLUS232D DECEMBER 19, 2002 REVISED NOVEMBER 2008
6
www.ti.com
APPLICATION INFORMATION
The values of five passive components must be determined to configure the UC3902 load share controller. The
output and return lines of each converter are connected together at the load, with current sense resistor RSENSE
inserted in each negative return line. Another resistor, RADJ, is also inserted in each positive remote sense line.
The differential share bus terminals (SHARE+ and SHARE) of each UC3902 are connected together
respectively, and the SHARE node is also connected to the system ground. A typical application is illustrated
in Figure 1.
The load share controller design can be executed by following the next few steps:
Step 1.
R
SENSE +
V
SHARE(max)
A
CSA
I
O(max)
D where ACSA is 40, the gain of the current sense amplifier
At full load, the voltage drop across the RSENSE resistor is IO(max) × RSENSE. Taking into account the gain of the
current sense amplifier, the voltage at full load on the current share bus,
V
SHARE(max) +
A
CSA
I
O(max)
R
SENSE
This voltage must stay 1.5-V below VCC or below 10 V whichever is smaller. VSHARE represents an upper limit
but the designer should select the full scale share bus voltage keeping in mind that every volt on the load share
bus increases the master controller’s supply current by approximately 100
A times the number of slave units
connected parallel.
Step 2.
R
G +
V
ADJ(max)
I
ADJ(max)
Care must be taken to ensure that IADJ(max) is low enough so that both the drive current and power dissipation
are within the device’s capability. For most applications, an IADJ(max) current between 5 mA and 10 mA is
acceptable. In a typical application, a 360-
RG resistor from the ADJR pin to ground sets IADJ(max) to
approximately 5 mA.
Step 3.
R
ADJ +
DV
O(max) * IO(max)
R
SENSE
I
ADJ(max)
RADJ must be low enough to not affect the normal operation of the converter’s voltage feedback loop. Typical
RADJ values are between 20 to100 depending on VO, VO(max) and the selected IADJ(max) value.
Step 4.
C
C +
g
M
2
p
f
C
R
ADJ
R
G
R
SENSE
R
LOAD
A
CSA
A
PWR
f
C
(1)
(2)
(3)
(4)
(5)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UC3902N | 功能描述:其他電源管理 LOAD SHARE CONTROLLER RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| UC3902N | 制造商:Texas Instruments 功能描述:LOAD SHARE CONTROLLER 3902 DIP8 |
| UC3902NG4 | 功能描述:其他電源管理 LOAD SHARE CONTROLLER RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| UC3903 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Quad Supply and Line Monitor |
| UC3903DW | 功能描述:監(jiān)控電路 Quad Supply and Line Monitor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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