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參數(shù)資料
| 型號(hào)： | LM5033SD |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 100V Push-Pull Voltage Mode PWM Controller |
| 中文描述： | 0.34 A SWITCHING CONTROLLER, PDSO10 |
| 封裝： | 4 X 4 MM, PLASTIC, LLP-10 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 295K |
| 代理商： | LM5033SD |
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Application Information
(Continued)
PC BOARD LAYOUT
The LM5033 current sense and PWM comparators are very
fast, and as such will respond to short duration noise pulses.
Layout considerations are critical for the current sense filter.
The components at pins 3, 8, 9, and 10 should be as
physically close as possible to the IC, thereby minimizing
noise pickup in the PC tracks.
If a current sense transformer is used both leads of the
transformer secondary should be routed to the sense filter
components, and to the IC pins. The ground side of the
transformer should be connected via a dedicated PC board
track to pin 7 of the IC rather than through the ground plane.
If the current sense circuit employs a sense resistor in the
drive transistor sources, a low inductance resistor should be
used. In this case all the noise sensitive low power grounds
should be connected in common near the IC, and then a
single connection made to the power ground (sense resistor
ground point).
The outputs of the LM5033, or of the high voltage gate driver
(if used), should have short direct paths to the power MOS-
FETs in order to minimize the effects of inductance in the PC
board traces.
If the internal dissipation of the LM5033 and any of the power
devices produces high junction temperatures during normal
operation, good use of the PC board’s ground plane can help
considerably to dissipate heat. The exposed pad on the
bottom of the LLP-10 package can be soldered to ground
plane on the PC board, and the ground plane should extend
out from beneath the IC to help dissipate the heat. The
exposed pad is internally connected to the IC substrate.
Additionally, the use of wide PC board traces where possible
can help conduct heat away from the IC. Judicious position-
ing of the PC board within the end product, along with use of
any available air flow (forced or natural convection) can help
reduce the junction temperatures.
APPLICATION CIRCUIT EXAMPLE
Figure 6
shows an example circuit for a half-bridge 200W
DC/DC converter built in a quarter brick format. The circuit is
that of an intermediate bus converter (IBC) which operates
open-loop (unregulated output), converting a nominal 48V
input to a nominal 9.0V output with a 30 m
output imped-
ance. The current sense transformer (T2), and the associ-
ated filter at the CS pin, provide overcurrent detection at
approximately 23A. The auxiliary winding on T1 powers V
and the LM5100’s V+ pin (once the outputs are enabled) to
reduce power dissipation within the LM5033. The LM5100
provides appropriate level shifting for Q1. Synchronous rec-
tifiers Q3 and Q4 minimize conduction losses in the output
stage. Dual comparators U2 and U3 provide under-voltage
and over-voltage sensing at Vin. The under-voltage sense
levels are 37V increasing, and 33V decreasing. The over-
voltage sense levels are 63V increasing, and 61.5V decreas-
ing. The circuit can be shut down by taking the ON/OFF input
below 0.8V. An external synchronizing frequency can be
applied to the SYNC input. Measured efficiency and output
characteristics for this circuit are shown in
Figure 4
and
Figure 5
.
20035416
FIGURE 3. Deadtime Adjustment
L
www.national.com
11
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| LM5033SD/NOPB | 功能描述:電壓模式 PWM 控制器 100V Push-Pull Volt Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5033SD-EVAL | 功能描述:電源管理IC開(kāi)發(fā)工具 LM5033SD EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM5033SDX | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5033SDX/NOPB | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5034 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:High Voltage Dual Interleaved Current Mode Controller with Active Clamp |
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