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參數(shù)資料
| 型號(hào)： | LM3101 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Secondary-Side PWM Controller |
| 中文描述： | 二次側(cè)PWM控制器 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LM3101 |
Functional Description
Oscillator/Synchronization Section
The operating frequency is set by a single resistor connect-
ed from the R
T
pin (pin 1) to ground, according to the equa-
tion:
F
O
e
0.25/(R
T
#
20 pF)
Inserting a 25 k
X
for R
T
sets the oscillator frequency at
500 kHz.
[
kHz,
X
]
.
The oscillator is capable of synchronizing to an external
source. To synchronize the oscillator, an external source is
connected to the SYNC pin (pin 4) via a differentiator (see
Figure 1). The external source delivers a pulse train to the
differentiator, which converts this signal into an AC-coupled
signal. The negative-edge of this signal, applied to the
SYNC pin, will control the oscillator, and thus set the operat-
ing frequency. The recommended values for R
SYNC
and
C
SYNC
are as follows:
R
SYNC
e
1 k
X
(typical)
and
C
SYNC
#
R
SYNC
l
1/(8
#
F
SYNC
)
[
F,
X
, kHz
]
.
To synchronize to a 600 kHz external source, and using a
R
SYNC
of 1 k
X
, the C
SYNC
must be:
C
SYNC
l
1/(8
#
R
SYNC
#
F
SYNC
)
e
1/(8
#
1 k
X
#
600 kHz)
208 pF
220 pF.
The oscillator frequency should range from 67% to 90% of
the synchronization frequency. In the above example, the
oscillator frequency can be between 400 kHz and 540 kHz.
TL/H/11436–6
FIGURE 1. Simplified Version of the
Synchronization Circuit
TL/H/11436–7
FIGURE 2. Simplified Version of the Short
Circuit Frequency Shift Circuit
8
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| LM3101M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Secondary-Side PWM Controller |
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| LM3102EVAL | 功能描述:BOARD EVALUATION LM3102 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise®, SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM3102EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM3102 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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