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Zakładka z wyszukiwarką danych komponentów |
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ML4818CS Arkusz danych(PDF) 1 Page - Micro Linear Corporation |
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ML4818CS Arkusz danych(HTML) 1 Page - Micro Linear Corporation |
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1 / 12 page  May 1997 ML4818 * Phase Modulation/Soft Switching Controller 1 GENERAL DESCRIPTION The ML4818 is a complete phase modulation control IC suitable for full bridge soft switching converters. Unlike conventional PWM circuits, the phase modulation technique allows for zero-voltage switching transitions and square wave drive across the transformer. The IC modulates the phases of the two sides of the bridge to control output power. The ML4818 can be operated in current mode. The delay times for the outputs are externally programmable to allow the zero-voltage switching transitions to take place. Pulse-by-pulse current limit, integrating fault detection, and soft start reset are provided. The under-voltage lockout circuit features a 6V hysteresis with a low starting current to allow off-line start up with a low power bleed resistor. A shutdown function powers down the IC, putting it into a low quiescent state. * Some Packages Are Obsolete) 10 13 11 2 3 5 8 9 12 4 24 20 16 17 22 21 14 * ILIM RCRESET SOFT START INV E/A OUT CT RAMP RT CLOCK SHUTDOWN VREF VCC A2 OUT A1 OUT B1 OUT B2 OUT RDELAY GND REFERENCE AND UNDER-VOLTAGE LOCKOUT – + T FLIP FLOP T Q Q S Q R OSC Q + – ΦMOD – + ERROR AMP V+ I1 +5V 3V Q R S + – 1V DELAY VCC DELAY VCC DELAY VCC DELAY INHIBIT OUTPUTS *PINS 1, 6, 7, 15, 18, 19 AND 23 ARE GND 0.7V I2 + R S FEATURES s Full bridge phase modulation zero voltage switching circuit with programmable ZV transition times s Constant frequency operation to 500kHz s Current mode operation s Cycle-by-cycle current limiting with integrating fault detection and restart delay s Precision buffered 5V reference (+1%) s Four 1.5A peak current totem-pole output drivers s Under-voltage lockout circuit with 6V hysteresis s Power DIP package allows higher dissipation BLOCK DIAGRAM |
Podobny numer części - ML4818CS |
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Podobny opis - ML4818CS |
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