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參數(shù)資料
| 型號(hào)： | UCC2819DW |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR |
| 中文描述： | 可編程輸出功率因數(shù)前置穩(wěn)壓器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 156K |
| 代理商： | UCC2819DW |
SLUS482B - APRIL 2001 REVISED DECEMBER 2004
5
www.ti.com
pin descriptions
CAI:
(current amplifier noninverting input) Place a resistor between this pin and the GND side of current-sense
resistor. This input and the inverting input (MOUT) remain functional down to and below GND.
CAOUT:
(current amplifier output) This is the output of a wide bandwidth operational amplifier that senses line
current and commands the PFC pulse-width modulator (PWM) to force the correct duty cycle. Compensation
components are placed between CAOUT and MOUT.
CT:
(oscillator timing capacitor) A capacitor from CT to GND sets the PWM oscillator frequency according to:
f
0.6
RT
CT
The lead from the oscillator timing capacitor to GND should be as short and direct as possible.
DRVOUT:
(gate drive) The output drive for the boost switch is a totem-pole MOSFET gate driver on DRVOUT.
Use a series gate resistor to prevent interaction between the gate impedance and the output driver that might
cause the DRVOUT to overshoot excessively. See characteristic curve (Figure 13) to determine minimum
required gate resister value. Some overshoot of the DRVOUT output is always expected when driving a
capacitive load.
GND:
(ground) All voltages measured with respect to ground. VCC and REF should be bypassed directly to
GND with a 0.1-
μ
F or larger ceramic capacitor.
IAC:
(current proportional to input voltage) This input to the analog multiplier is a current proportional to
instantaneous line voltage. The multiplier is tailored for very low distortion from this current input (I
IAC
) to
multiplier output. The recommended maximum I
IAC
is 500
μ
A.
MOUT:
(multiplier output and current amplifier inverting input) The output of the analog multiplier and the
inverting input of the current amplifier are connected together at MOUT. As the multiplier output is a current, this
is a high-impedance input so the amplifier can be configured as a differential amplifier. This configuration
improves noise immunity and allows for the leading-edge modulation operation. The multiplier output current
is limited to 2
IIAC. The multiplier output current is given by the equation:
IIAC
VVFF
IMOUT
(VVAOUT
2
1)
K
where K
1
OVP/EN:
(over-voltage/enable) A window comparator input that disables the output driver if the boost output
voltage is a programmed level above the nominal or disables both the PFC output driver and resets SS if pulled
below 1.9 V (typ).
PKLMT:
(PFC peak current limit) The threshold for peak limit is 0 V. Use a resistor divider from the negative side
of the current sense resistor to VREF to level shift this signal to a voltage level defined by the value of the sense
resistor and the peak current limit. Peak current limit is reached when PKLMT voltage falls below 0 V.
RT:
(oscillator charging current) A resistor from RT to GND is used to program oscillator charging current. A
resistor between 10 k
and 100 k
is recommended. Nominal voltage on this pin is 3 V.
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| UCC2819DWG4 | 功能描述:功率因數(shù)校正 IC BiCMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819DWTR | 功能描述:功率因數(shù)校正 IC BiCMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819DWTRG4 | 功能描述:功率因數(shù)校正 IC BiCMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819N | 功能描述:功率因數(shù)校正 IC BiCMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819NG4 | 功能描述:功率因數(shù)校正 IC BiCMOS 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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