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参数资料
| 型号： | S-8520A28MC-AVN-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 216 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 5/43页 |
| 文件大小： | 488K |
| 代理商： | S-8520A28MC-AVN-T2 |
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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLOR
Rev.7.5_00
S-8520 / 8521 Series
Seiko Instruments Inc.
13
2. Soft start function
The S-8520 / 8521 Series comes with a built-in soft start circuit. This circuit enables the output voltage
(VOUT) to rise gradually over the specified soft start time (t), when the power is switched on or when the
OFF
/
ON
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 (Refer to Figure 8). 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
→4.0 V)
t [1 ms/div]
VOUT
[1 V/div]
Rush current
[0.5 A/div]
0 A
1.5 A
3 V
Power switched on
0 V
Figure 8 Waveforms of output voltage and rush current at soft start
3.
OFF
ON/
pin (Shutdown pin)
This pin deactivates or activates the step-down operation.
When the
OFF
/
ON
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
OFF
/
ON
pin is configured as shown in Figure 9. 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
0.3 to 1.8 V to the pin, lest the current consumption increase. When this
OFF
/
ON
pin is not used,
leave it coupled to the VIN pin.
Table 8
OFF
/
ON
pin
CR Oscillation Circuit
Output Voltage
“H”
Activated
Set value
“L”
Deactivated
VSS
OFF
/
ON
VIN
VSS
Figure 9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8520A28MC-AVNT2G | 功能描述:DC/DC 开关控制器 2.8V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520A29MC-ARO-T2 | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
| S-8520A29MC-AVO-T2 | 功能描述:DC/DC 开关控制器 2.9V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520A29MC-AVOT2G | 功能描述:DC/DC 开关控制器 2.9V Step-Down PWM RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8520A30MC-ARP-T2 | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS |
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