- 您现在的位置：买卖IC网 > PDF目录271889 > S-8521C30MC-BTP-T2G 0.05 A SWITCHING CONTROLLER, 72 kHz SWITCHING FREQ-MAX, PDSO5 PDF资料下载
参数资料
| 型号： | S-8521C30MC-BTP-T2G |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 72 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | LEAD FREE, SOT-23, 5 PIN |
| 文件页数： | 17/44页 |
| 文件大小： | 511K |
| 代理商： | S-8521C30MC-BTP-T2G |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
Rev.9.0_00
Seiko Instruments Inc.
24
The voltage accuracy of the OUT cannot be made higher than the output voltage accuracy (VOUT ±2.4%) of the IC
itself, without adjusting the RA and RB involved. The closer the voltage value of the output OUT and the output
voltage value (VOUT) of the IC are brought to one other, the more the output voltage remains immune to deviations
in the absolute accuracy of RA and RB and the absolute value of R1 and R2 in the IC. In particular, to suppress the
influence of deviations in R1 and R2 in the IC, a major contributor to deviations in the OUT, the RA and RB must be
limited to a much smaller value than that of R1 and R2 in the IC.
On the other hand, a reactive current flows through RA and RB. This reactive current must be reduced to a
negligible value with respect to the load current in the actual use of the IC so that the efficiency characteristics will
not be degraded. This requires that the value of RA and RB be made sufficiently large.
However, too large a value (more than 1 M
Ω) for the R
A and RB would make the IC vulnerable to external noise.
Check the influence of this value on actual equipment.
There is a tradeoff between the voltage accuracy of the OUT and the reactive current. This should be taken into
consideration based on the requirements of the intended application.
Deviations in the absolute value of the internal resistances (R1 and R2) in the IC vary with the output voltage of the
S-8520/8521 Series, and are broadly classified as follows:
Table 10
Output voltage
Deviations in the absolute value of R1 and R2 in the IC
1.5 V to 2.0 V
5.16 M
Ω to 28.9 MΩ
2.1 V to 2.5 V
4.44 M
Ω to 27.0 MΩ
2.6 V to 3.3 V
3.60 M
Ω to 23.3 MΩ
3.4 V to 4.9 V
2.44 M
Ω to 19.5 MΩ
5.0 V to 6.0 V
2.45 M
Ω to 15.6 MΩ
When a value of R1 + R2 given by the equation indicated below is taken in calculating the voltage value of the
output OUT, a median voltage deviation will be obtained for the OUT.
R1 + R2 = 2 ÷ (1 ÷ maximum deviation in absolute value of R1 and R2 + 1 ÷ minimum deviation in absolute value
of R1 and R2)
Moreover, add a capacitor (CC) in parallel to the external resistance (RA) in order to avoid output oscillations and
other types of instability (Refer to Figure 14).
Make sure that CC is larger than the value given by the following equation:
CC [F] ≥ 1 ÷ (2 × π × RA [Ω] × 7.5 kHz)
If a large CC value is selected, a longer soft start time than the one set up in the IC will be set.
Caution
The above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
相关PDF资料 |
PDF描述 |
|---|---|
| S-8521F32MC-BPR-T2G | 0.05 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO5 |
| S-80160BLMC-JFLT2U | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| S-80160CLMC-JJLT2U | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| S-8353J25MC-IYKT2U | SWITCHING REGULATOR, 287.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| S-80810CNPF-B9OTFU | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8521C30MC-BXP-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-8521C31MC-BTQ-T2 | 功能描述:DC/DC 开关控制器 3.1V Step-Dn PWM/PFM 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-8521C31MC-BTQT2G | 功能描述:DC/DC 开关控制器 3.1V Step-Dn PWM/PFM 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-8521C31MC-BXQ-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-8521C32MC-BTR-T2 | 功能描述:DC/DC 开关控制器 3.2V Step-Dn PWM/PFM 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 |
发布紧急采购，3分钟左右您将得到回复。