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參數(shù)資料
| 型號： | 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)： | 9/21頁 |
| 文件大?。?/td> | 200K |
| 代理商： | S-816A33 |
External Transistor Type Voltage Regulators
S-816 Series
Rev.3.0
8
Seiko Instruments Inc.
n
Application Circuits
1. Overcurrent protection circuit
Figure 9 shows a sample of overcurrent protection implemented with an external circuit connected.
The internal overcurrent protection function of the S-816 Series is designed to detect the sink current (base current of the
PNP transistor) at the EXT terminal, therefore it may not be able to protect the external PNP transistor from collector
overcurrents caused by an EXT-GND short-circuiting or other phenomenon occurring outside the IC.
This sample circuit activates the regulator intermittently against collector overcurrents, thereby suppressing the heat
generation of the external PNP transistor.
The duty of the on-time and off-time of the intermittent operation can be regulated through an external component.
S-816 Series
EXT
V
OUT
V
SS
ON/OFF
V
IN
OUT
+
-
Tr.1
C1
0.22uF
Tr.2
VIN
R1
R3
2k
W
100k
W
2k
W
0.5
W
2k
W
CL
10uF
10uF
CIN
2SA1213Y
Rs
+
-
R2
R4
C2
0.22uF
Figure 9
S-816A30AMC (VIN:4V)
t(2msec/div)
Load
Current
(0.5A/div)
0A
1A
2V
ON/OFF
(1V/div)
0V
S-816A30AMC (VIN:4V)
t(100μsec/div)
(0.5A/div)
0A
1A
2V
ON/OFF
(1V/div)
0V
Load
Figure 10. Output Current Waveforms during Intermittent Operation Prompted by Load Short-Circuiting
The detection of the overcurrent is done by the sense resistance (Rs) and the PNP transistor (Tr.1).
When Tr.1 comes on, triggered by a voltage drop of Rs, the NPN transistor (Tr.2) also comes on, according to the time
constants of the capacitor (C2) and resistance (R2). This causes the power-off terminal to turn to the 'L' level, and the regulating
operation to stop, and interrupting the current to the load.
When the load current is cut off, the voltage drop of Rs stops. This makes Tr.1 off again, and also makes the NPN transistor
(Tr.2) off.
In this condition, the power-off terminal returns to the 'H' level, according to the time constants of the capacitor (C1) and
resistance (R1). This delay time in which power-off terminal returns to the 'H' level from the 'L' level is the time in which the load
current remains cut off.
If an overcurrent flows again after the power-off terminal has assumed the 'H' level following the delay time and the regulating
operation has been restarted, the circuit will again suspend the regulating operation and resume the intermittent operation. This
intermittent operation will be continued till the overcurrentt is eliminated, and once theovercurrent disappears, the normal
operation will be restored.
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相關代理商/技術參數(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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(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 供應商器件封裝:SOT-23-5 標準包裝: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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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