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SI9118DY-T1 датащи(PDF) 1 Page - Vishay Siliconix |
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SI9118DY-T1 датащи(HTML) 1 Page - Vishay Siliconix |
1 / 11 page Vishay Siliconix Si9118, Si9119 Document Number: 70815 S11-0975–Rev. E, 16-May-11 www.vishay.com 1 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Programmable Duty Cycle Controller FEATURES • 10 to 200 V Input Range • Current-Mode Control • Internal Start-Up Circuit • Buffer Slope Compensation Voltage • Soft-Start • 2.7 MHz Error Amp • 500 mA Output Drive Current • Light Load Frequency Fold-Back • Low Quiescent Current • Programmable Maximum Duty Cycle, with 80 % as Default DESCRIPTION The Si9118/Si9119 are a BiC/DMOS current-mode pulse width modulation (PWM) controller ICs for high-frequency dc/dc converters. Single-ended topologies (forward and flyback) can be implemented at frequencies up to 1 MHz. The controller operates in constant frequency mode during the full load and automatically switches to pulse skipping mode under light load to maintain high efficiency throughout the full load range. The maximum duty cycle is easily programmed with a resistor divider for optimum control. The push-pull output driver provides high-speed switching to external MOSPOWER devices large enough to supply 50 W of output power. Shoot-through current for internal push-pull stage is almost eliminated to minimize quiescent supply current. The push-pull output driver provides high-speed switching to external MOSPOWER devices large enough to supply 50 W of output power. Shoot-through current for internal push-pull stage is almost eliminated to minimize quiescent supply current. The high-voltage DMOS transistor permits direct operation from bus voltages of up to 200 V. Other features include a 1.5 % accurate voltage reference, 2.7 MHz bandwidth error amplifier, standby mode, soft-start and undervoltage lockout circuits. The Si9118/Si9119 are available in both standard and lead (Pb)-free packages. FUNCTIONAL BLOCK DIAGRAM CS + – + – + – Ref Gen 100 mV Undervoltage 8.6 V Error Amplifier VCC +VIN 4.6 V 23µA Lockout VREF –VIN -V IN LIMIT + – 4 3 7 16 1 14 56 11 10 Substrate + – 1.0 - 2.0 V 600 mV PWM IMAX Pulse Skip NI SS/EN – + + – EN + – 2 R S Q SYNC (Si9119) 12 MAX 13 15 DR 8 COSC 9 ROSC 9.3 V (VREG) OSC |
Аналогичный номер детали - SI9118DY-T1 |
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Аналогичное описание - SI9118DY-T1 |
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