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參數(shù)資料
| 型號(hào)： | S-816A33 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | 3.3V±2.0% External Transistor Type Voltage Regulators(輸出電壓3.3V±2.0%，外部晶體管型穩(wěn)壓器) |
| 中文描述： | 3.3 ± 2.0％外部晶體管式電壓調(diào)節(jié)器（輸出電壓為3.3V ± 2.0％，外部晶體管型穩(wěn)壓器） |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 200K |
| 代理商： | S-816A33 |
External Transistor Type Voltage Regulators
S-816 Series
Rev.3.0
6
Seiko Instruments Inc.
n
Selection of Associated External Components
1. External PNP transistor
Select an external transistor according to the conditions of input voltage, output voltage, and output current. A low-saturation
voltage PNP transistor with 'hfe' ranging from 100 to 300 will be suitable for this IC.
The parameters for selection of the external PNP transistor include the maximum collector-base voltage, the maximum
collector-emitter voltage, the DC amplification factor (hfe), the maximum collector current and the collector dissipation.
The maximum collector-base voltage and the maximum collector-emitter voltage are determined by the input voltage range in
each specific application to be employed. You may select a transistor with an input voltage at least several volts higher than the
expected maximum input voltage.
The DC amplification factor (hfe) affects the maximum output current that can be supplied to the load.
With an internal overcurrent protection circuit of this IC, the base current is clamped, and will not exceed the overcurrent set
value (Imax). Select a transistor which is capable of delivering the required maximum output current to the intended application,
with hfe and maximum collector current. (See the paragraph of Overcurrent Protection Circuit on page 5)
Likewise, select a transistor, based on the maximum output current and the difference between the input and output voltages,
with due attention to the collector dissipation.
2. Output Capacitor (CL)
The S-816 Series performs phase compensation by an internal phase compensation circuit of IC, and the ESR (Equivalent
Series Resistance) of an output capacitor for to secure stable operation even in the presence of output load variation. Therefore,
always place a capacitor (CL) of 4.7uF or more between V
OUT
and V
ss
.
For stable operation of the S-816 Series, it is essential to employ a capacitor with an ESR having optimum range. Whether an
ESR is larger or smaller than that optimum range (approximately 0.1
W
to 5
W
), this could produce an unstable output, and cause
a possibility of oscillations. For this reason, a tantalum electrolytic capacitor is recommended.
When a ceramic capacitor or an OS capacitor having a low ESR is selected, it will be necessary to connect an additional
resistance that serves for the ESR in series with the output capacitor, as illustrated in Figure 6. The resistance value that needs
to be added will be from 0.1
W
to 5
W
, but this value may vary depends on the service conditions, and should be defined through
careful evaluation in advance. In general, our recommendation is 0.3
W
or so.
An aluminum electrolytic capacitor tends to produce oscillations as its ESR increases at a low temperature. Beware of this
case. When this type of capacitor is employed, make thorough evaluation of it, including its temperature characteristics.
OUT
IN
R
@
0.3
W
CL
S-816 Series
EXT
V
OUT
V
SS
ON/OFF
V
IN
Figure 6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S-816A37 | 3.7V±2.0% External Transistor Type Voltage Regulators(輸出電壓3.7V±2.0%，外部晶體管型穩(wěn)壓器) |
| S-816A40 | 4.0V±2.0% External Transistor Type Voltage Regulators(輸出電壓4.0V±2.0%，外部晶體管型穩(wěn)壓器) |
| S-816A50 | 5.0V±2.0% External Transistor Type Voltage Regulators(輸出電壓5.0V±2.0%，外部晶體管型穩(wěn)壓器) |
| S-817A15 | 1.5V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓1.5V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器) |
| S-817A20 | 2.0V±2.0% Ultra Compact 3-Pin Positive Voltage Regulator(輸出電壓2.0V±2.0%,緊湊型結(jié)構(gòu)3腳正電壓穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-816A33AMC-BAI-T2 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-816A33AMC-BAIT2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-816A33AMC-BAIT2U | 功能描述:IC REG LINEAR 1A 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 穩(wěn)壓器數(shù):1 電流 - 輸出:1A 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1 |
| S-816A34AMC-BAI-T2 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| S-816A34AMC-BAIT2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 1uA 2.0% RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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