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| 型號： | S-8521A33MC-AXS-T2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 7/37頁 |
| 文件大?。?/td> | 599K |
| 代理商： | S-8521A33MC-AXS-T2 |
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
7
Measurement Circuits:
EXT
VSS
ON/OFF
1
VOUT
open
VIN
A
open
VSS
ON/OFF
2
VIN
-
+
VOUT
EXT
O
A
VSS
ON/OFF
0.68k
VOUT
3
VIN
-
-
V
+
+
2200pF
EXT
Figure 3
Operation:
1.
Step-Down DC-DC Converter
1.1 PWM Control (S-8520 Series)
The S-8520 Series consists of DC/DC converters that employ a pulse-width modulation (PWM) system.
This series is characterized by its low current consumption. In conventional PFM system DC/DC
converters, pulses are skipped when they are operated with a low output load current, causing
variations in the ripple frequency of the output voltage and an increase in the ripple voltage. Both of
these effects constitute inherent drawbacks to those converters.
In converters of the S-8520 Series, the pulse width varies in a range from 0% to 100%, according to the
load current, and yet ripple voltage produced by the switching can easily be removed through a filter
because the switching frequency remains constant. Therefore, these converters provide a low-ripple
power over broad ranges of input voltage and load current.
1.2 PWM/PFM-Switched Control (S-8521 Series)
The S-8521 Series consists of DC/DC converters capable of automatically switching the pulse-wide
modulation system (PWM) over to the pulse-frequency modulation system (PFM), and vice versa,
according to the load current. This series of converters features low current consumption.
In a region of high output load currents, the S-8521 Series converters function with PWM control, where
the pulse-width duty varies from 25% to 100%. This function helps keep the ripple power low.
For certain low output load currents, the converters are switched over to PFM control, whereby pulses
having their pulse-width duty fixed at 25% are skipped depending on the quantity of the load current,
and are output to a switching transistor. This causes the oscillation circuit to produce intermittent
oscillation. As a result, current consumption is reduced and efficiency losses are prevented under low
loads. Especially for output load currents in the region of 100
μ
A, these DC/DC converters can operate
at extremely high efficiency.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8521A33MC-AXST2G | 功能描述:DC/DC 開關控制器 3.3V 60uA Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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-8521A34MC-AXT-T2 | 功能描述:DC/DC 開關控制器 3.4V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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-8521A34MC-AXTT2G | 功能描述:DC/DC 開關控制器 3.4V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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-8521A35MC-AXU-T2 | 功能描述:DC/DC 開關控制器 3.5V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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-8521A35MC-AXUT2G | 功能描述:DC/DC 開關控制器 3.5V Step-Dn PWM/PFM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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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