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參數(shù)資料
| 型號： | S-8521F32MC-BPR-T2G |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | LEAD FREE, SOT-23, 5 PIN |
| 文件頁數(shù)： | 7/44頁 |
| 文件大?。?/td> | 511K |
| 代理商： | S-8521F32MC-BPR-T2G |
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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.9.0_00
S-8520/8521 Series
Seiko Instruments Inc.
15
4.
Overload protection circuit (A, C, E types)
The A, C and E types of the S-8520/8521 Series have a built-in overload protection circuit.
If the output voltage drops under the overload status, the maximum duty status (100%) continues. If this 100% duty
status lasts longer than the overload detection time (tpro), the circuit keeps the EXT pin at “H” to protect the
switching transistor and inductor. When the overload protection circuit is functioning, the soft start works in the IC
for the reference voltage, and the reference voltage rises slowly from 0 V. The reference voltage and the feedback
voltage obtained by dividing the output voltage are compared to each other. While the reference voltage is low, the
EXT pin keeps “H” and oscillation stops. If the reference voltage rises and exceeds the feedback voltage, oscillation
restarts.
After oscillation is restarted, if a load is heavy and the EXT pin keeps the “L” level longer than the overload
detection time (tpro), the circuit operates again, and the IC enters the intermittent operation mode by repeating the
action described above. Once the overload state is off, the IC restarts the normal operation.
Waveforms
at EXT pin
Protection circuit ON
[tss × 0.3]
Overload detection time (tpro)
Figure 10
Waveforms at EXT pin when the overload protection circuit operates
5.
100% duty cycle
The S-8520/8521 Series operates with a maximum duty cycle of 100%. When using the B, D and F types products,
which do not have the overload protection circuit, the switching transistor keeps ON continually to supply current to
the load, even in cases where the input voltage drops to the set value of output voltage or less. The output voltage
in this case is; the voltage subtracting both of the inductance’s DC resistance and the voltage drop by the switching
resistor’s ON-resistance, from the input voltage.
The A, C and E types that have the overload protection circuit cannot be used for continually supplying current to
the load, as described above, because these types enter the intermittent operation mode by the overload protection
circuit’s operation, when 100% duty lasts longer than the overload detection time (tpro).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| S-8521F33MC-BPS-T2 | 功能描述:DC/DC 開關控制器 3.3V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8521F33MC-BPST2G | 功能描述:DC/DC 開關控制器 3.3V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8521F34MC-BPTT2G | 功能描述:DC/DC 開關控制器 Step Down SWR PWM/ PFM 300kHz 100uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8521F36MC-BPVT2G | 功能描述:DC/DC 開關控制器 StepDOWN SWR PWM/PFM 300kHz 100uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8521F38MC-BPXT2U | 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:晶體管驅動器 功能:降壓 輸出配置:正 拓撲:降壓 輸出數(shù):1 輸出階段:1 電壓 - 電源（Vcc/Vdd）:2.5 V ~ 16 V 頻率 - 開關:300kHz 占空比（最大）:1 同步整流器:無 時鐘同步: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 供應商器件封裝:SOT-23-5 標準包裝:1 |
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