參數(shù)資料
型號(hào)： LM3524D
廠商： National Semiconductor Corporation
英文描述： Regulating Pulse Width Modulator
中文描述： 調(diào)節(jié)脈沖寬度調(diào)制器
文件頁(yè)數(shù)： 19/22頁(yè)
文件大小： 1172K
代理商： LM3524D
Typical Applications
(Continued)
In calculating the output capacitor C
o
it can be seen that C
o
supplies I
o
during t
ON
. The voltage change on C
o
during this
time will be some
V
c
=
V
o
or the output ripple of the
regulator. Calculation of C
o
is:
where: C
o
is in farads, f is the switching frequency,
V
o
is the p-p output ripple
Calculation of inductor L1 is as follows:
V
IN
is applied across L1
where: L1 is in henrys, f is the switching frequency in Hz
To apply the above theory, a complete step-up switching
regulator is shown in
Figure 20
. Since V
is 5V, V
is tied
to V
. The input voltage is divided by 2 to bias the error
amplifier’s inverting input. The output voltage is:
The network D1, C1 forms a slow start circuit.
This holds the output of the error amplifier initially low thus
reducing the duty-cycle to a minimum. Without the slow start
circuit the inductor may saturate at turn-on because it has to
supply high peak currents to charge the output capacitor
from 0V. It should also be noted that this circuit has no
supply rejection. By adding a reference voltage at the non-
inverting input to the error amplifier, see
Figure 21
, the input
voltage variations are rejected.
The LM3524D can also be used in inductorless switching
regulators.
Figure 22
shows a polarity inverter which if con-
nected to
Figure 20
provides a 15V unregulated output.
L
www.national.com
19
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3524DM 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
LM3524DM/NOPB 功能描述:電壓模式 PWM 控制器 REGULATING PULSE WIDTH MODULATOR 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
LM3524DM/NOPB 制造商:Texas Instruments 功能描述:Pulse Width Modulation (PWM) Controller
LM3524DMX 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
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
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