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| 型號(hào)： | S-8521C25MC-BTK-T2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 8/37頁 |
| 文件大?。?/td> | 599K |
| 代理商： | S-8521C25MC-BTK-T2 |
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
Rev.7.2
Seiko Instruments Inc.
8
2.
Power-Off Pin (ON/OFF Pin)
This pin deactivates or activates the step-down operation.When the power-off pin is set to "L", the Vin
voltage appears through the EXT pin, prodding the switching transistor to go off. All the internal circuits
stop working, and substantial savings in current consumption are thus achieved.
The power-off pin is configured as shown in Figure 4. Since pull-up or pull-down is not performed
internally, please avoid operating the pin in a floating state. Also, try to refrain from applying a voltage
of 0.3V to 1.8V to the pin, lest the current consumption increase. When this power-off pin is not used,
leave it coupled to the VIN pin.
3.
Soft-Start Function
The S-8520/21 Series comes with a built-in soft-start circuit. This circuit enables the output voltage to
rise gradually over the specified soft-start time, when the power is switched on or when the power-off
pin remains at the "H" level. This prevents the output voltage from overshooting.
However, the soft-start function of this IC is not able to perfectly prevent a rush current from flowing to
the load (see Figure 5). Since this rush current depends on the input voltage and load conditions, we
recommend that you evaluate it by testing performance with the actual equipment.
S-8520A33MC (Vin:0
→
4.0V)
t(1msec/div)
Output voltage
(1V/div)
Rush current
(0.5A/div)
0A
1.5A
0V
3V
Power switched on
Figure 5 Waveforms of Output Voltage and Rush Current at Soft-Start
V
SS
Figure 4
Power-Off Pin
CR Oscillation
Circuit
Output
Voltage
“H”
Activated
Set
value
“L”
Deactivated
V
SS
ON/OFF
V
IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8521C25MC-BTKT2G | 功能描述:DC/DC 開關(guān)控制器 2.5V Step-Dn PWM/PFM 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-8521C25MC-BXK-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-8521C27MC-BTM-T2 | 功能描述:DC/DC 開關(guān)控制器 2.7V Step-Dn PWM/PFM 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-8521C27MC-BTMT2G | 功能描述:DC/DC 開關(guān)控制器 2.7V Step-Dn PWM/PFM 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-8521C27MC-BXM-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 |
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