Datenblatt-Suchmaschine für elektronische Bauteile |
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CA1523E Datenblatt(PDF) 3 Page - Intersil Corporation |
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CA1523E Datenblatt(HTML) 3 Page - Intersil Corporation |
3 / 6 page 7-13 CA1523 Other Desirable Features Other desirable features along with various circuit block function explanations are listed below. • The Oscillator is a sawtooth generator whose charge (rise) cycle determines the output pulse width and dis- charge which is continuously variable from very low to maximum of ICHARGE. • Charge ICHARGE = IO -IDISCHARGE giving 2 to 1 pulse-width control • Discharge IDISCHARGE = approximately 0 to 1/2 IO to frequency control. • Pulse Shaping: Applied to the oscillator output via RS Flip-Flop with parallel inhibit controlled by slow-start over- current sense, supply voltage monitor and ON/OFF func- tions. • Pulse Rise Time: Modified to meet RFI requirements by external slow-down capacitor. • Slow Start with Reset: Externally programmed against internal 3V reference. Reset is initiated upon Inhibit ensur- ing soft start at power up and restart. • Over Current Sense: Internal stable thresholds of 1.2V. • Supply Voltage Monitors: Locks out the drive until VSUPPLY has reached 8V-9V. • ON/OFF: Activates regulator independent of raw DC. • Error Amplifier: Compares output against a stable 6.8V internal reference and controls the discharge current sink on the timing capacitor. • Band-Gap: Reference voltage (internal) provides temper- ature compensated 1.2V and 6.8V references. • Separate GND: The power GND is separated from circuit ground for improved noise. • ESD Protection: Pins are protected against ESD. Block Diagram 14 1 7 CURRENT SENSE IC/2 IC +6.8V REF. ERROR VOLTAGE VCC VCC 10 3K S3 1.2V REF. - + ID ~ IC/2 FOR VI << 6.8V 12 ON/OFF 3 Q HIGH CLOSES S1 S1 CURRENT SETUP Q LOW CLOSES S3 + - VCC > 8.4V - + - + VL 2.5V VH 5V LOGIC OUT 9 S R Q F/F S R Q F/F 4 REF. VOLTAGE SOURCES 13 5 6 11 2 ZENER 6.8V REF. TIMING CAP GND S2 OPEN WHEN VIO > 6.8V 3V (CONTROL CIRCUIT GND) SLOW START REF. 5V REF. RISE TIME PULSE OUTPUT OUTPUT GND OVER CURRENT ID |
Ähnliche Teilenummer - CA1523E |
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Ähnliche Beschreibung - CA1523E |
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