LX1555MY Microsemi Analog Mixed Signal Group, LX1555MY Datasheet - Page 5

• Manufacturer Part Number: LX1555MY
• Description: IC PWM CURRENT MODE 8.4V 8DIP
• Manufacturer: Microsemi Analog Mixed Signal Group

Specifications of LX1555MY

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 48%
• Voltage - Supply: 11 V ~ 25 V
• Buck: Yes
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -55°C ~ 125°C
• Package / Case: 8-DIP
• Frequency-max: 500kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Copyright © 1994
Rev. 1.0b
FIGURE #
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. START-UP CURRENT vs. TEMPERATURE
11. START-UP CURRENT vs. SUPPLY VOLTAGE
12. START-UP CURRENT vs. SUPPLY VOLTAGE
13. DYNAMIC SUPPLY CURRENT vs. OSCILLATOR FREQUENCY
14. CURRENT SENSE DELAY TO OUTPUT vs. TEMPERATURE
15. CURRENT SENSE THRESHOLD vs. ERROR AMPLIFIER OUTPUT
16. START-UP THRESHOLD vs. TEMPERATURE
17. START-UP THRESHOLD vs. TEMPERATURE
18. MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
19. MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
20. LOW LEVEL OUTPUT SATURATION VOLTAGE DURING UNDER-
21. OUTPUT SATURATION VOLTAGE vs. OUTPUT CURRENT and
22. OUTPUT SATURATION VOLTAGE vs. OUTPUT CURRENT and
OSCILLATOR FREQUENCY vs. TIMING RESISTOR
MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
OSCILLATOR DISCHARGE CURRENT vs. TEMPERATURE
OSCILLATOR FREQUENCY vs. TEMPERATURE
OUTPUT INITIAL ACCURACY vs. TEMPERATURE
OUTPUT DUTY CYCLE vs. TEMPERATURE
REFERENCE VOLTAGE vs. TEMPERATURE
REFERENCE SHORT CIRCUIT CURRENT vs. TEMPERATURE
E.A. INPUT VOLTAGE vs. TEMPERATURE
VOLTAGE LOCKOUT
TEMPERATURE
TEMPERATURE
GRAPH / CURVE INDEX
Characteristic Curves
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
U
LTRA
P
-L
R O D U C T I O N
OW
S
TART
-U
P
C
URRENT
D
, C
A T A
FIGURE #
23. TYPICAL APPLICATION OF START-UP CIRCUITRY
24. REFERENCE VOLTAGE vs. TEMPERATURE
25. SIMPLIFIED SCHEMATIC OF OSCILLATOR SECTION
26. DUTY CYCLE VARIATION vs. DISCHARGE CURRENT
27. OSCILLATOR FREQUENCY vs. TIMING RESISTOR
28. MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
29. CURRENT SENSE THRESHOLD vs. ERROR AMPLIFIER OUTPUT
FIGURE #
30. CURRENT SENSE SPIKE SUPPRESSION
31. MOSFET PARASITIC OSCILLATIONS
32. ADJUSTABLE BUFFERED REDUCTION OF CLAMP LEVEL
33. EXTERNAL DUTY CYCLE CLAMP AND MULTI-UNIT SYCHRONIZATION
34. SLOPE COMPENSATION
35. OPEN LOOP LABORATORY FIXTURE
36. OFF-LINE FLYBACK REGULATOR
URRENT
WITH SOFT-START
S
-M
H E E T
ODE
Theory of Operation Section
Typical Applications Section
PWM
FIGURE INDEX
LX1552/3/4/5
5