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參數(shù)資料
| 型號： | UC2854BL |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 455K |
| 代理商： | UC2854BL |
SLUS329B JUNE 1998 REVISED FEBRUARY 2005
2
www.ti.com
DESCRIPTION (continued)
The UC3854A/B products improve upon the UC3854 by offering a wide bandwidth, low offset current amplifier,
a faster responding and improved accuracy enable comparator, a VREF GOOD comparator, UVLO threshold
options (16 V/10 V for offline, 10.5 V/10 V for startup from an auxiliary 12 V regulator), lower startup supply
current, and an enhanced multiply/divide circuit. New features like the amplifier output clamps, improved
amplifier current sinking capability, and low offset VAC pin reduce the external component count while improving
performance. Improved common mode input range of the multiplier output/current amplifier input allow the
designer greater flexibility in choosing a method for current sensing. Unlike its predecessor, R
SET
controls only
oscillator charging current and has no effect on clamping the maximum multiplier output current. This current
is now clamped to a maximum of 2
×
I
AC
at all times which simplifies the design process and provides foldback
power limiting during brownout and extreme low line conditions.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1)
UCX854A, UCX854B
UNIT
Supply voltage, VCC
GTDRV current, IGTDRV
GTDRV Current, IGTDRV
22
V
Continuous
0.5
A
50% duty cycle
1.5
A
Input voltage
VSENSE, VRMS, ISENSE MOUT
PKLMT
11
V
5
V
Input current
RSET, IAC, PKLMT, ENA
10
mA
Power dissipation
1
W
Junction temperature, TJ
Storage temperature, Tstg
Lead temperature, Tsol, 1,6 mm (1/16 inch) from case for 10 seconds
(1)Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to
GND. Currents are positive into and negative out of, the specified terminal. ENA input is internally clamped to approximately 10 V.
55 to 150
65 to 150
°
C
300
RECOMMENDED OPERATING CONDITIONS
MIN
MAX
UNIT
Supply voltage, VCC
10
20
V
UC1854X
55
125
Operating junction temperature, TJ
UC2854X
UC3854X
40
0
85
70
°
C
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| UC2854BNG4 | 功能描述:功率因數(shù)校正 IC Enhanced High Power Factor Preregulator RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2854BQ | 功能描述:功率因數(shù)校正 IC Enhanced High Power Factor Preregulator RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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