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| 型号： | S-8520E35MC-BJU-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 6/43页 |
| 文件大小： | 499K |
| 代理商： | S-8520E35MC-BJU-T2 |
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PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-DOWN SWITCHING REGULATOR
S-8520/8521 Series
Rev.7.4_20
14
Seiko Instruments Inc.
3. 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.
(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 (Ex. S-8520A33MC)
4. Overload protection circuit (A, C, E types)
The A, C and E types of the S-8520/8521 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 0 V. 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
×0.3]
Overload detection time (tpro)
Figure 9 Waveforms appearing at EXT pin as the overload protection circuit operates
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8520E50MC-BKJ-T2 | 功能描述:DC/DC 开关控制器 5.0V 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-8520E50MC-BKJT2G | 功能描述:DC/DC 开关控制器 5.0V 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-8520E50MC-BKJT2U | 功能描述:IC REG CTRLR BUCK SOT23-5 制造商:ablic u.s.a. inc. 系列:- 包装:剪切带（CT） 零件状态:在售 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:1 输出阶段:1 电压 - 电源（Vcc/Vdd）:2.5 V ~ 10 V 频率 - 开关:300kHz 占空比（最大）:1 同步整流器:无 时钟同步:无 串行接口:- 控制特性:使能 工作温度:-40°C ~ 85°C（TA） 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| S-8520E52MC-BKLT2G | 功能描述:DC/DC 开关控制器 Step Down SWR PWM 300kHz 100uA Iq 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-8520F15MC-BNAT2G | 功能描述:DC/DC 开关控制器 Step Down SWR PWM 300kHz 100uA Iq 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 |
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