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參數(shù)資料
| 型號： | LM5046MHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 15/32頁 |
| 文件大?。?/td> | 888K |
| 代理商： | LM5046MHX |
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In general, the amount of slope compensation required to
avoid sub-harmonic oscillation is equal to at least one-half the
down-slope of the output inductor current, transformed to the
primary. To mitigate sub-harmonic oscillation after one
switching period, the slope compensation has to be equal to
one times the down slope of the filter inductor current trans-
posed to primary. This is known as deadbeat control. The
slope compensation resistor required to implement dead-beat
control can be calculated as follows:
Where N
TR is the turns-ratio with respect to the secondary.
For example, for a 3.3V output converter with a turns-ratio
between primary and secondary of 9:1, an output filter induc-
tance (L
FILTER) of 800nH and a current sense resistor
(R
SENSE) of 150m, RSLOPE of 1.67k will suffice.
30147825
FIGURE 12. Current Mode Configuration
VIN and VCC
The voltage applied to the VIN pin, which may be the same
as the system voltage applied to the power transformer’s pri-
mary (V
PWR), can vary in the range of the 14 to 100V. It is
recommended that the filter shown in Figure 13 be used to
suppress the transients that may occur at the input supply.
This is particularly important when VIN is operated close to
the maximum operating rating of the LM5046. The current into
VIN depends primarily on the LM5046’s operating current, the
switching frequency, and any external loads on the VCC pin,
that typically include the gate capacitances of the power
MOSFETs. In typical applications, an auxiliary transformer
winding is connected through a diode to the VCC pin. This pin
must raise VCC voltage above 8V to shut off the internal start-
up regulator.
After the outputs are enabled and the external VCC supply
voltage has begun supplying power to the IC, the current into
the VIN pin drops below 1mA. VIN should remain at a voltage
equal to or above the VCC voltage to avoid reverse current
through the internal body diode of the internal VCC regulator.
FOR APPLICATIONS WITH > 100V INPUT
For applications where the system input voltage exceeds
100V, VIN can be powered from an external start-up regulator
as shown in Figure 14. In this configuration, the VIN and VCC
pins should be connected together. The voltage at the VCC
and VIN pins must be greater than 10V (>Max VCC reference
voltage) yet not exceed 16V. To enable operation the VCC
voltage must be raised above 10V. The voltage at the VCC
pin must not exceed 16V. The voltage source at the right side
of Figure 14 is typically derived from the power stage, and
becomes active once the LM5046’s outputs are active.
www.national.com
22
LM5046
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM5046MHX/NOPB | 功能描述:電流型 PWM 控制器 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 |
| LM5046SQ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers |
| LM5046SQ/NOPB | 功能描述:電流型 PWM 控制器 Phase-Shifted Full- Bridge PWM Cntrlr 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 |
| LM5046SQX | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM5046 Phase-Shifted Full-Bridge PWM Controller with Integrated MOSFET Drivers |
| LM5046SQX/NOPB | 功能描述:IC PWM CTRLR FULL BRIDG 28LLP RoHS:是 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:PowerWise® 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
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