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| 型號： | S-8520E47MC-BKG-T2 |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 15/43頁 |
| 文件大?。?/td> | 499K |
| 代理商： | S-8520E47MC-BKG-T2 |
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PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-DOWN SWITCHING REGULATOR
S-8520/8521 Series
Rev.7.4_20
22
Seiko Instruments Inc.
Application Circuits
1. External adjustment of output voltage
The S-8520/8521 Series allows you to adjust the output voltage or to set the output voltage to a value
over the preset output voltage range (6 V) of the products of this series, when external resistances (RA
and RB), and capacitor (CC) are added, as illustrated in Figure 14. Moreover, a temperature gradient
can be obtained by inserting a thermistor or other element in series with RA and RB.
S-8520/8521Series
CC
RA
RB
D1
VOUT
+
VIN
OUT
EXT
+
Reference
voltage source
with soft start
+
R2
R1
OFF
/
ON
VSS
Oscillation
circuit
PWM control or
PWM/PFM switching
control circuit
Figure 14
The S-8520/8521 Series have an internal impedance of R1 and R2 between the VOUT pin and the VSS
pin, as shown in Figure 14.
Therefore, the output voltage (OUT) is determined by the output voltage value (VOUT) of the S-8520/8521
Series, and the ratio of the parallel resistance value of external resistance (RB) and internal resistances
(R1
+R2) of the IC, to external resistance (RA). The output voltage is expressed by the following equation:
OUT
=VOUT+VOUT×RA÷(RB//
*1(R
1
+ R2))
The voltage accuracy of the OUT set by resistances (RA and RB) is not only affected by the IC's output
voltage accuracy (VOUT
±2.4 %), but also by the absolute precision of external resistances (RA and RB) in
use and the absolute value deviations of internal resistances (R1 and R2) in the IC.
Let us designate the maximum deviations of the absolute value of RA and RB by RAmax and RBmax,
respectively, the minimum deviations by RAmin and RBmin, respectively, and the maximum and minimum
deviations of the absolute value of R1 and R2 in the IC by (R1
+R2) max and (R1+R2) min, respectively.
Then, the minimum deviation value OUTmin and the maximum deviation value OUTmax of the OUT are
expressed by the following equations:
OUT min.
=VOUT×0.976+VOUT×0.976×RAmin.÷(RBmax//(R1+R2) max.)
OUT max.
=VOUT×1.024+VOUT×1.024×RAmax.÷(RBmin//(R1+R2) min.)
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.
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| S-8520E50MC-BKJ-T2 | 功能描述:DC/DC 開關(guān)控制器 5.0V Step-Down PWM 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520E50MC-BKJT2G | 功能描述:DC/DC 開關(guān)控制器 5.0V Step-Down PWM 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520E50MC-BKJT2U | 功能描述:IC REG CTRLR BUCK SOT23-5 制造商:ablic u.s.a. inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 輸出類型:晶體管驅(qū)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 ~ 10 V 頻率 - 開關(guān):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 |
| S-8520E52MC-BKLT2G | 功能描述:DC/DC 開關(guān)控制器 Step Down SWR PWM 300kHz 100uA Iq 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520F15MC-BNAT2G | 功能描述:DC/DC 開關(guān)控制器 Step Down SWR PWM 300kHz 100uA Iq 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 安裝風格: 封裝 / 箱體:CPAK |
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