LR8K4-G Supertex, LR8K4-G Datasheet - Page 4

• Manufacturer Part Number: LR8K4-G
• Description: Linear Regulators - Standard 450V Adj 3 Termnl
• Manufacturer: Supertex

Specifications of LR8K4-G

• Polarity: Positive
• Number Of Outputs: 1
• Output Type: Adjustable
• Output Voltage: 1.26 V
• Output Current: 20 mA
• Line Regulation: 0.01 % / V
• Load Regulation: 3 %
• Input Voltage Max: 480 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 2500 mW
• Mounting Style: SMD/SMT
• Output Voltage Tolerance: +/- 5 %
• Voltage Regulation Accuracy: 5 %
• Package / Case: TO-252 (DPAK)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Typical Application Circuits
Figure 1: High Input Voltage, 5.0V Output Linear Regulator
Figure 2: SMPS Start-Up Circuit
Figure 3: High Voltage Adjustable Constant Current Source
V
Supertex inc.
IN
= (V
VIN
LR8
OUT
17 to 450V
+ 12V) to 450V
VOUT
* Required for conditions where V
ADJ
V
IN
=
C1
V
(V
+
-
IN
OUT
=
+ 12V) to 450V
1235 Bordeaux Drive, Sunnyvale, CA 94089
VIN
LR8
V
CC
LR8
VIN
VOUT
ADJ
VOUT
ADJ
V
IN
FB
AUXILIARY
is less than V
*
R2
18.2k
1%
4
PWM IC
1.0µF
R1
6.04k
1%
R
OUT
V
I
OUT
OUT
V
Tel: [phone]
OUT
C2
1.0µF
= 1.20V 1+
=
1.20V
= 5.0V
R
Load
R2
R1
R
LOAD
www.supertex.com
+ I
≤16.5k
ADJ
R2
V
V
OUT
OUT
+
+
-
-
1
1
LR8