參數(shù)資料
型號(hào): LM3524DMWC
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: 0.2 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, UUC
封裝: WAFER
文件頁(yè)數(shù): 4/22頁(yè)
文件大?。?/td> 728K
代理商: LM3524DMWC
Typical Applications (Continued)
A complete step-down switching regulator schematic, using
the LM3524D, is illustrated in
Figure 15. Transistors Q1 and
Q2 have been added to boost the output to 1A. The 5V regu-
lator of the LM3524D has been divided in half to bias the er-
ror amplifier’s non-inverting input to within its common-mode
range. Since each output transistor is on for half the period,
actually 45%, they have been paralleled to allow longer pos-
sible duty cycle, up to 90%. This makes a lower possible in-
put voltage. The output voltage is set by:
where V
NI is the voltage at the error amplifier’s non-inverting
input.
Resistor R3 sets the current limit to:
Figures 16, 17 and show a PC board layout and stuffing dia-
gram for the 5V, 1A regulator of
Figure 15. The regulator’s
performance is listed in
Table 1.
DS008650-19
FIGURE 14. Inductor Current Slope in Step-Down
Regulator
DS008650-20
*Mounted to Staver Heatsink No. V5-1.
Q1 = BD344
Q2 = 2N5023
L1 = >40 turns No. 22 wire on Ferroxcube No. K300502 Torroid core.
FIGURE 15. 5V, 1 Amp Step-Down Switching Regulator
www.national.com
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LM3524DMX/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
LM3524DN 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
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