LX1555CDT データシートの表示（PDF） - Microsemi Corporation
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LX1555CDT Datasheet PDF : 18 Pages
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PRODUCT DATABOOK 1996/1997
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
PRODUCTION DATA SHEET
LX1552/3/4/5
CHARACTERISTIC CURVES
FIGURE 13. — DYNAMIC SUPPLY CURRENT vs.
OSCILLATOR FREQUENCY
30
27 TA = 25°C
RT = 10k
24 CL = 1000pF
21
18
VIN = 16V
VIN = 12V
VIN = 10V
15
12
9
6
3
0
10
100
1000
Oscillator Frequency - (kHz)
FIGURE 14. — CURRENT SENSE DELAY TO OUTPUT vs.
TEMPERATURE
300
270 VCC = 15V
VPIN3 = 0V to 2V
240 CL = 1nF
210
180
150
120
90
60
30
0
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 15. — CURRENT SENSE THRESHOLD vs.
ERROR AMPLIFIER OUTPUT
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
TA = 125°C
TA = 25°C
TA = -55°C
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Error Amplifier Output Voltage - (V)
FIGURE 16. — START-UP THRESHOLD vs. TEMPERATURE
8.8
8.7
LX1553
LX1555
8.6
8.5
8.4
8.3
8.2
8.1
8.0
7.9
7.8
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
Copyright © 1994
Rev. 1.0a 1/01
9
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