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LR745 Datasheet(PDF) 4 Page - Supertex, Inc

Part # LR745
Description  High Input Voltage SMPS Start-up
PDF  7 Pages
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

LR745 Datasheet(HTML) 4 Page - Supertex, Inc

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LR745
● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
0.0
3.0
2.0
1.0
0.0
12.0
8.0
4.0
0.0
30.0
20.0
10.0
0.0
4.0
PWM IC Start Threshold Voltage
LR7 V
OFF Trip Point
Auxiliary Supply Powers PWM IC
t
t
t
t
8.0
12.0
13.5
16.0
V
OUT
(Volts)
I
Stage
Stage
Stage
I
IN
(mA)
V
AUX
(Volts)
I
AUX
(mA)
V
AUX = 12V
I
AUX = 20mA
I
IN ≈ 0mA
III
II
Figure 1: Simplified SMPS Using LR745
High Voltage
V
IN
V
OUT
V
CC
I
AUX
V
AUX
C1
C2
D2
I
IN
GND
LR7
PWM IC
UC3844
Figure 1: LR745 Start-up Waveforms



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