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參數(shù)資料
| 型號： | UC2879L |
| 英文描述： | 350 to 400 MHz FSK/ASK receiver (ST-RECORD01 family) |
| 中文描述： | 電流/電壓模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 373K |
| 代理商： | UC2879L |
6
UC1879
UC2879
UC3879
RT
(Clock/Sync Duty Cycle Set Pin): The UC3879
oscillator produces a sawtooth waveform. The rising edge
is generated by connecting a resistor from RT to GND
and
a
capacitor
from
CT
description). During the rising edge, the modulator has
linear control of the duty cycle. The duty cycle jumps to
100% when the voltage on COMP exceeds the oscillator
peak voltage. Selection of RT should be done first, based
on the required upper end of the linear duty cycle range
(D
lin
) as follows:
to
GND
(see
CT
pin
(
)
RT
mA
Dlin
=
25
.
10
1
Recommended values for RT range from 2.5k to 100k.
SS:
Connect a capacitor between this pin and GND to
set the soft start time. The voltage at SS will remain near
zero volts as long as VIN is below the UVLO threshold.
Soft start will be pulled up to about 4.8V by an internal
9
μ
A current source when VIN and VREF become valid
(assuming a non-fault condition). In the event of a current
fault (CS voltage exceeding 2.5V), soft start will be pulled
to GND and then ramp to 4.8V. If a fault occurs during the
soft start cycle, the outputs will be immediately disabled
and soft start must fully charge prior to resetting the fault
latch. For paralleled controllers, the soft start pins may be
paralleled to a single capacitor, but the charge currents
will be additive.
UVSEL:
Connecting this pin to VIN sets a turn on voltage
of 10.75V with 1.5V of UVLO hysteresis. Leaving the pin
open-circuited programs a turn on voltage of 15.25V with
6.0V of hysteresis.
VC
(Output Switch Supply Voltage): This pin supplies
power to the output drivers and their associated bias
circuitry. The difference between the output high drive
and VC is typically 2.1V. This supply should be bypassed
directly to PWRGND with a low ESR/ESL capacitor.
VIN
(Primary Chip Supply Voltage): This pin supplies
power to the logic and analog circuitry on the integrated
circuit that is not directly associated with driving the
output stages. Connect VIN to a stable source above 12V
for normal operation. To ensure proper functionality, the
UC3879
is
inactive
until
undervoltage lockout threshold. This pin should be
bypassed directly to GND with a low ESR/ESL capacitor.
VIN
exceeds
the
upper
NOTE:
When VIN exceeds the UVLO threshold the supply cur-
rent (I
IN
) jumps from about 100
μ
A to greater than 20mA. If the
UC3879 is not connected to a well bypassed supply, it may im-
mediately enter the UVLO state again. Therefore, sufficient by-
pass capacity must be added to ensure reliable startup.
VREF:
This pin provides an accurate 5V voltage
reference. It is internally short circuit current limited.
VREF is disabled while VIN is below the UVLO threshold.
The
circuit
is
also
disabled
approximately 4.75V. For best results bypass VREF with
a 0.1
μ
F, low ESR/ESL capacitor.
until
VREF
reaches
PIN DESCRIPTIONS (cont.)
UNITRODE CORPORATION
7 CONTINENTAL BLVD. MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
ADDITIONAL INFORMATION
Please refer to the following Unitrode publications for
additional information.
The following three topics are
available in the Applications Handbook.
[1] Application Note U-154, The New UC3879 Phase-
Shifted PWM Controller Simplifies the Design of Zero
Voltage Transition Full-Bridge Converters by Laszlo
Balogh.
[2] Application Note U-136, Phase Shifted, Zero Voltage
Transition Design Considerations and the UC3875 PWM
Controller by Bill Andreycak.
Design Note DN-63, The Current-Doubler Rectifier: An
Alternative Rectification Technique for Push-Pull and
Bridge Converters by Laszlo Balogh.
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PDF描述 |
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| UC2879N | 350 to 400 MHz FSK/ASK receiver (ST-RECORD01 family) |
| UC2879Q | 40MHZ to 1GHZ amplifier |
| UC3879DW | Quad 2-input OR gate |
| UC3879N | Octal D-type latch with 3 state outputs (non inverted) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC2879N | 功能描述:軟開關(guān) PWM 控制器 Phase Shift Resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2879NG4 | 功能描述:軟開關(guān) PWM 控制器 Phase Shift Resonant Controller RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UC2886D | 功能描述:電流型 PWM 控制器 Avg Current Mode IC RoHS:否 制造商:Texas Instruments 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC2886DG4 | 功能描述:電流型 PWM 控制器 Avg Current Mode IC RoHS:否 制造商:Texas Instruments 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC28TRXS | 制造商:ST MICRO 功能描述:New |
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