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參數(shù)資料
| 型號(hào)： | LR8N8 |
| 廠商： | SUPERTEX INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | High Input Voltage Adjustable 3-Terminal Linear Regulator |
| 中文描述： | 1.2 V-440 V ADJUSTABLE POSITIVE REGULATOR, PSSO3 |
| 封裝： | TO-243AA, SOT-89, 3 PIN |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大小： | 601K |
| 代理商： | LR8N8 |
8
LR8
LR8
Application Note
AN-H40
Operation
Except for it’s higher voltage rating, the LR8 operates like any
other 3-terminal adjustable linear regulator.
A simple resistive divider sets the output voltage while a capacitor
at the output improves transient response and ensures regulator
stability. When applicable, an input capacitor is required to
provide energy storage for rectified AC.
Keeping in mind that the LR8 requires at least a 10V difference
between input and output for proper operation, the minimum
value for C
IN
is:
Introduction
The LR8 is a high voltage 3-terminal adjustable linear regulator.
Intended for operation directly off rectified AC mains, the LR8
operates at input voltages up to 450 volts, making it compatible
with line voltages up to 240 VAC. It’s output voltage adjustability
assures that it can be used in most any application. The LR8 is
ideally suited for low power off-line DC power supplies and
SMPS start-up circuits.
Available in a leaded TO-92 package and a surface mount
SOT-89 and D-PAK package, it is ideal for applications where
space is at a premium.
Relevant specifications are shown in the table below.
Input Voltage Range
(V
OUT
+10V) to 450V
Output Voltage Range
1.2V to (V
IN
- 10V)
Output Voltage Accuracy
±
5%
Power Dissipation
TO-92:
TO-243AA (SOT-89):
TO-252 (D-PAK):
0.74W
1.6W
2.5W
Output Current
0.5 to 10mA
Load Regulation
3%
Line Regulation
0.01%/V
Supply Rejection
60dB typ @120Hz
LR8 Specifications
C
I
t
V
V
IN
LOAD
IN pk
(
OUT
>
)
10
V
where
I
LOAD
t
= Load current
= Time between peaks of input
waveform
V
IN(pk)
= Peak input voltage
V
OUT
= Output voltage
Note that the LR8 requires a minimum of 0.5mA load current for
proper operation. The current through the resistive divider may
be included as part of the minimum load.
High Voltage Linear Regulators and
Constant Current Sources Using LR8
by Scott Lynch, Senior Applications Engineer
LR8 Block Diagram and Typical Application
Overtemp &
Overcurrent
10
μ
A
1.2V
V
IN
V
OUT
ADJ
LR8
Pass
Element
R
1
R
2
C
OUT
≥
1
μ
F
C
IN
Needed for protection should V
OUT
exceed V
IN
Load
Supply
V
R
R
R
OUT
=
+
+
μ
1 2
1
10
2
1
2
v
A
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