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SC1104BISTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1104BISTR Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 7 page POWER MANAGEMENT 1 www.semtech.com SC1104A/B Simple, Synchronous Voltage Mode PWM Controller PRELIMINARY .eatures Applications Revision 3, October 2001 Typical Application Circuit Description The SC1104A/B is a versatile voltage-mode PWM con- troller designed for use in single ended DC/DC power supply applications. A simple, fixed frequency high effi- ciency buck regulator can be implemented using the SC1104A/B with a minimum of external components. Internal level shift and drive circuitry eliminates the need for an expensive P-channel, high-side switch. The small device footprint allows for compact circuit design. SC1104A/B features include temperature compensated voltage reference, triangle wave oscillator, current limit comparator and an externally compensated error amplifier. Current limit is implemented by sensing the voltage drop across the top .ETs R DS(ON).. The SC1104A/B operates at a fixed frequency of 300/ 600 kHz, providing an optimum compromise between efficiency, external component size, and cost. 600kHz switching frequency is typically reserved for the 5V operation only. SC1104A/B has a thermal protection circuit, which is activated if the junction temperature exceeds 150°C. K +5V or +12V operation K High efficiency (>90%) K 1% Reference voltage accuracy K Hiccup mode over current protection K Robust output drive K R DS(ON) Current sensing K Industrial temperature range K SO-8 package K Termination supplies K Low cost microprocessor supplies K Peripheral card supplies K Industrial power supplies K High density DC/DC conversion Typical Distributed Power Supply Q1 Si4884DY Q2 Si4874DY L1 1.5-3uH C9 0.1 C10 220/4V C11 220/4V C12 220/4V C13 220/4V C6 47/16V C5 47/16V + _ + _ Vin 5 to 12V 3.3V R3 1.00k R4 2.32k C3 0.1 C14-17 1.0 C7 47/16V VCC 7 DL 3 DH 4 PHASE 6 COMP/SS 1 BST 5 SENSE 8 GND 2 U1 SC1104A/B R6 1-5.1 R7 1-5.1 R1 2k D1 MBRA130L R2 10 C2 0.01 C4 10.0 C1 220-680pF C8 0.1-0.22 R5 200-1k R8 10 D2 (opt) .igure 1 |
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