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| 型號(hào)： | S-8520A33MC-AVS-T2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 9/37頁 |
| 文件大?。?/td> | 599K |
| 代理商： | S-8520A33MC-AVS-T2 |
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
9
4.
Overload Protection Circuit (A, C, E Series)
The S-8520/21A, S-8520/21C Series, and S-8520/21E Series come with a built-in overload protection
circuit.
If the output voltage falls because of an overload, the maximum duty state (100%) will continue. If this
100% duty state lasts longer than the prescribed overload detection time (TPRO), the overload
protection circuit will hold the EXT pin at "H," thereby protecting the switching transistor and inductor.
When the overload protection circuit is functioning, the reference voltage circuit will be activated by
means of a soft-start in the IC, and the reference voltage will rise slowly from 0V. The reference
voltage and the feedback voltage obtained by dividing the output voltage are compared to each other.
So long as the reference voltage is lower, the EXT pin will be held at "H" to keep the oscillation
inactive. If the reference voltage keeps rising and exceeds the feedback voltage, the oscillation will
resume.
If the load is heavy when the oscillation is restarted, and the EXT pin holds the "L" level longer than the
specified overload detection time (TPRO), the overload protection circuit will operate again, and the IC
will enter intermittent operation mode, in which it repeats the actions described above. Once the
overload state is eliminated, the IC resumes normal operation.
Waveforms at
EXT pin
Protection circuit ON
(TSS x 0.3)
Overload detection time
(TPRO)
Figure 6 Waveforms Appearing at EXT Pin As the Overload Protection Circuit Operates
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| S-8520A33MC-AVST2G | 功能描述:DC/DC 開關(guān)控制器 3.3V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| S-8520A34MC-ART-T2 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
| S-8520A34MC-AVT-T2 | 功能描述:DC/DC 開關(guān)控制器 3.4V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| S-8520A34MC-AVTT2G | 功能描述:DC/DC 開關(guān)控制器 3.4V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| S-8520A34MC-AVTT2U | 功能描述:IC REG CTRLR BUCK SOT23-5 制造商:ablic u.s.a. inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 輸出類型:晶體管驅(qū)動(dòng)器 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出數(shù):1 輸出階段:1 電壓 - 電源（Vcc/Vdd）:2.5 V ~ 10 V 頻率 - 開關(guān):180kHz 占空比（最大）:1 同步整流器:無 時(shí)鐘同步:無 串行接口:- 控制特性:使能 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
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