LX1553 MICROSEMI [Microsemi Corporation], LX1553 Datasheet
LX1553
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LX1553 Summary of contents
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... FORWARD CONVERTERS DC-DC BUCK OR BOOST CONVERTERS LOW COST DC MOTOR CONTROL Part # Start-Up Hysteresis Max. Duty 250µA Voltage LX1552 16V 6V 248K LX1553 8.4V 0.8V 0.56W LX1554 16V 6V LX1555 8.4V 0.8V using the Ceramic DIP TSSOP Y PW 8-pin 20-pin — ...
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LX1552/3/4 ...
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(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX155xC with 0°C ...
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... COMP 4. Gain defined as ISENSE 5. Adjust V above the start threshold before setting at 15V Output frequency equals oscillator frequency for the LX1552 and LX1553. Output frequency is one half oscillator frequency for the LX1554 and LX1555 34V GROUND** 16V (1552/1554) 8.4V (1553/1555) ...
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GRAPH / CURVE INDEX Characteristic Curves FIGURE # 1. OSCILLATOR FREQUENCY vs. TIMING RESISTOR 2. ...
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LX1552/3/4/5 FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING RESISTOR 1000 100 C = 6.8nF T 10 ...
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... FIGURE 5. — OUTPUT INITIAL ACCURACY vs. TEMPERATURE 65.0 LX1552 and LX1553 only 63.5 62.0 60.5 59.0 57.5 56.0 54.5 53.0 51.5 50.0 -75 -50 - Ambient Temperature - (°C) A FIGURE 7. — REFERENCE VOLTAGE vs. TEMPERATURE 5.03 5.02 5.01 5.00 4.99 4.98 4.97 4.96 4.95 -75 -50 - Ambient Temperature - (°C) A Copyright © 1994 Rev ...
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... FIGURE 12. — START-UP CURRENT vs. SUPPLY VOLTAGE PWM ODE 250 225 200 LX1552/LX1554 175 150 125 100 LX1553/LX1555 -75 -50 - Ambient Temperature - (°C) A 250 LX1552/LX1554 225 T = 25°C A 200 175 150 ...
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... FIGURE 16. — START-UP THRESHOLD vs. TEMPERATURE 8.8 8 125°C A 8.6 8.5 8.4 8 -55°C A 8.2 8.1 8.0 7.9 7.8 3.0 3.5 4.0 4.5 5.0 LX1552/3/4/5 -M PWM ODE TEMPERATURE V = 15V PIN3 C = 1nF L -75 -50 - Ambient Temperature - (°C) A LX1553 LX1555 -75 -50 - Ambient Temperature - (°C) A 100 125 100 125 9 ...
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... FIGURE 18. — MINIMUM OPERATING VOLTAGE vs. 11.0 LX1552 10.8 LX1554 10.6 10.4 10.2 10 100 125 FIGURE 20. — LOW LEVEL OUTPUT SATURATION VOLTAGE 1.20 LX1553 1.08 LX1555 0.96 0.84 0.72 0.60 0.48 0.36 0.24 0.12 0. 100 125 -M PWM ODE S ...
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FIGURE 21. — OUTPUT SATURATION VOLTAGE vs. OUTPUT CURRENT and TEMPERATURE 6 ...
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... Start-up Voltage Hysterises Voltage PART # ( LX1552 16V 8.4V LX1553 LX1554 16V 8.4V LX1555 UNDERVOLTAGE LOCKOUT The LX155x undervoltage lock-out is designed to maintain an ultra low quiescent current of less than 250µA, while guarantee- ing the IC is fully functional before the output stage is activated. Comparing this to the SG384x series reduction in start-up current is achieved resulting in 75% less power dissipation in the start-up resistor ...
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VOLTAGE REFERENCE The voltage reference is a low drift bandgap design which provides +5.0V to ...
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LX1552/3/4/5 OSCILLATOR (continued) The oscillator is designed such that many values of R give the same ...
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CURRENT SENSE COMPARATOR AND PWM LATCH Switch current is sensed by an external sense resistor ...
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LX1552/3/4/5 FIGURE 30. — CURRENT SENSE SPIKE SUPPRESSION LX155x ...
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LX1552/3/4 ...