lr645 Supertex, Inc., lr645 Datasheet - Page 5
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lr645
Manufacturer Part Number
lr645
Description
High Input Voltage Smps Start-up / Linear Regulator
Manufacturer
Supertex, Inc.
Datasheet
1.LR645.pdf
(9 pages)
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Figure 4: High Current Regulation
Figure 5: Typical Output Voltage vs Resistor Ratio
AC Line
277V
24V
to
12
10
8
GND
2.5
C
IN
Resistor Ratio (R2/R1)
LR645LG
DN2540N5
R1 + R2 = 250KΩ
3.0
5
GATE
3.5
V
OUT
C
OUT
4.0
5.0V
REG
150mA
5.0V
0 to
+
–
LR645