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參數(shù)資料
| 型號： | UCC28701D |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 5.0 AMP POSITIVE VOLTAGE REGULATOR |
| 中文描述： | 5.0放大器正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 371K |
| 代理商： | UCC28701D |
7
UCC1580-1,-2,-3,-4
UCC2580-1,-2,-3,-4
UCC3580-1,-2,-3,-4
Output Configurations
The UCC3580 family of ICs is designed to provide con-
trol functions for single ended active clamp circuits. For
different implementations of the active clamp approach,
different drive waveforms for the two switches (main and
auxiliary) are required. The -3 and -4 versions of the IC
supply
complementary
non-overlapping
(OUT1 and OUT2) with programmable delay which can
be used to drive the main and auxiliary switches. Most
active clamp configurations will require one of these out-
puts to be transformer coupled to drive a floating switch
(e.g. Figure 5). The -1 and -2 versions have the phase of
OUT2 inverted to give overlapping waveforms. This con-
figuration is suitable for capacity coupled driving of a
ground referenced p-channel auxiliary switch with the
OUT2 drive while OUT1 is directly driving an n-channel
main switch (e.g. Figure 4).
waveforms
The programmable delay can be judiciously used to get
zero voltage turn-on of both the main and auxiliary
switches in the active clamp circuits. For the UCC3580,
a single pin is used to program the delays between
OUT1 and OUT2 on both sets of edges. Figure 1 shows
the relationships between the outputs. Figure 2 gives the
ratio between the two delays. During the transition from
main to auxiliary switch, the delay is not very critical for
ZVS turn-on. For the first half of OUT1 off-time, the body
diode of the auxiliary switch conducts and OUT2 can be
turned on any time. The transition from auxiliary to main
switch is more critical. Energy stored in the parasitic in-
ductance(s) at the end of the OUT2 pulse is used to dis-
charge the parasitic capacitance across the main switch
during the delay time. The delay (Delay 1) should be op-
timally programmed at 1/4 the resonant period deter-
mined by parasitic capacitance and the resonant
inductor (transformer leakage and/or magnetizing induc-
tances, depending on the topology). However, depend-
ing on other circuit parasitics, the resonant behavior can
change, and in some cases, ZVS turn-on may not be ob-
tainable. It can be shown that the optimum delay time is
independent of operating conditions for a specific circuit
and should be determined specifically for each circuit.
APPLICATION INFORMATION (cont.)
Figure 4. Active clamp forward converter.
UDG-95071-2
Note that Vicor Corporation has claimed that the use of active reset in a forward converter topology is covered by their U.S. Patent
No. 4,441,146. Unitrode is not suggesting or encouraging persons to infringe or use Vicor’s patented technology absent a license
from Vicor.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UCC28701DBVR | 功能描述:電流型 PWM 控制器 Constant-Vltg,Const Current PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UCC28701DBVT | 功能描述:電流型 PWM 控制器 Constant-Vltg,Const Current PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UCC28702DBVR | 功能描述:低壓差控制器 - LDO LDO 200mA Linear Reg RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| UCC28702DBVT | 功能描述:低壓差控制器 - LDO LDO 200mA Linear Reg RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| UCC28703DBVR | 功能描述:低壓差控制器 - LDO LDO 200mA Linear Reg RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負載調節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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