參數(shù)資料
型號(hào)： UC3875L
廠商： Texas Instruments, Inc.
英文描述： Phase Shift Resonant Controller
中文描述： 相移諧振控制器
文件頁(yè)數(shù)： 7/19頁(yè)
文件大?。?/td> 721K
代理商： UC3875L
7
UC1875/6/7/8
UC2875/6/7/8
UC3875/6/7/8
VC (output switch supply voltage):
This pin supplies
power to the output drivers and their associated bias cir-
cuitry. Connect VC to a stable source above 3V for nor-
mal operation, above 12V for best performance. This
supply should be bypassed directly to the PWRGND pin
with low ESR, low ESL capacitors.
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 out-
put stages. Connect VIN to a stable source above 12V
for normal operation. To ensure proper chip functionality,
these devices will be inactive until VIN exceeds the up-
per undervoltage lockout threshold. This pin should by
bypassed directly to the GND pin with low ESR, low ESL
capacitors.
NOTE: When VIN exceeds the UVLO threshold the sup-
ply current (I
IN
) will jump from about 100
μ
A to a current
in excess of 20
μ
A. If the UC1875 is not connected to a
well bypassed supply, it may immediately enter UVLO
again.
VREF:
This pin is an accurate 5V voltage reference. This
output is capable of delivering about 60mA to peripheral
circuitry and is internally short circuit current limited.
VREF is disabled while VIN is low enough to force the
chip into UVLO. The circuit is also in UVLO until VREF
reaches approximately 4.75V. For best results bypass
VREF with a 0.1
μ
F, low ESR, low ESL, capacitor to the
GND pin.
PIN DESCRIPTIONS (cont.)
When power is applied to the circuit and VIN is below
the upper UVLO threshold, I
IN
will be below 600
μ
A, the
reference generator will be off, the fault latch is reset,
the soft-start pin is discharged, and the outputs are ac-
tively held low. When VIN exceeds the upper UVLO
threshold, the reference generator turns on. All else re-
mains in the shut-down mode until the output of the ref-
erence, VREF, exceeds 4.75V.
APPLICATION INFORMATION
Undervoltage Lockout Section
UDG-99136
GATE
REFERENCE
GENERATOR
VIN
10.75V/9.25V
VREF
GND
INTERNAL
BIAS
4.75V
TO SOFT-
START
LOGIC
Simplified Oscillator Schematic
UDG-95077
UDG-95079
UDG-95078
The
free-running
free-running operation, the frequency is set via an ex-
high
frequency
or
oscillator
may
be
either
For
externally
synchronized.
ternal resistor and capacitor to ground from the
FREQSET pin.
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參數(shù)描述
UC3875N 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
UC3875NG4 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
UC3875QP 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
UC3875QPTR 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
UC3876N 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
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