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參數(shù)資料
| 型號(hào)： | CS51220ED16 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 184K |
| 代理商： | CS51220ED16 |
CS51220
http://onsemi.com
13
Program Oscillator Frequency
CS51220 requires an external capacitor to program the
oscillator
frequency.
The
internally
trimmed
charge/discharge current determines the maximum duty
cycle. The capacitor for a required switching frequency fS
can be calculated by:
CT
+ 13400
fS
* 95
where:
CT = Timing capacitance is in pF
fS = Switching frequency is in kHz
Figure 16 shows the relationship of CT and fS.
200
CT (pF)
Figure 16. Operating Frequency
Frequency
(kHz)
600
550
500
450
400
350
300
250
200
150
100
300
400
500
600
Synchronized Dual Converters with Soft Hiccup and
Feed Forward
The circuits shown in Figures 17 and 18 illustrate typical
applications for a dual output supply using independent but
synchronized converters. These circuits demonstrate the use
of the soft hiccup, feed forward, volt–second control and
synchronization features of the CS51220.
In Figure 17, the feed forward circuit has a volt–second
constant of 82 V/
s. This would limit the duty factor to 0.51
at 48 V input. With a turns ratio of 4:1 on the power
transformer and 48 V input, a duty factor of 0.46 is required
for 5.0 V output. This converter serves as the master
synchronization generator. The voltage on the VSD pin
establishes the delay as it is compared to the ramp generated
on the CT pin.
Adjustable synchronization allows the conduction time
for the two converters to be adjusted so that they are not on
at the same time. This greatly reduces the ripple current from
the 48 V source.
In Figure 18, the feed forward circuit has a volt–second
constant of 63 V/
s. This would limit the duty factor to 0.39
at 48 V input. With a turns ratio of 4:1 on the power
transformer and 48 V input, a duty factor of 0.33 is required
for 3.3V output.
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相關(guān)代理商/技術(shù)參數(shù) |
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| CS51220EDR16 | 功能描述:IC REG CTRLR DIV ISO PWM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| CS51221 | 制造商:CHERRY 制造商全稱:CHERRY 功能描述:Enhanced Voltage Mode PWM Controller |
| CS51221/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced Voltage Mode PWM Controller |
| CS51221_09 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Enhanced Voltage Mode PWM Controller |
| CS51221ED16 | 功能描述:電壓模式 PWM 控制器 Enhanced Current 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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