lr645 Supertex, Inc., lr645 Datasheet - Page 5

• Manufacturer Part Number: lr645
• Description: High Input Voltage Smps Start-up / Linear Regulator
• Manufacturer: Supertex, Inc.

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