sc2608 Semtech Corporation, sc2608 Datasheet
sc2608
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sc2608 Summary of contents
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... The SC2608 is a versatile voltage-mode PWM controller designed for use in step down DC/DC power supply appli- cations. A simple, fixed frequency, highly efficient buck regulator can be implemented using the SC2608 with mini- mal external components. The input voltage range is from +3.3V to +12V. Internal level shift and drive circuitry elimi- nates the need for an expensive P-channel, high-side MOSFET ...
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... < SC2608 ...
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... < T < < T < SC2608 ...
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... POWER MANAGEMENT Gate Drive Timing Diagram Block Diagram REF 0.8V E/A + SENSE - © 2005 Semtech Corp. Figure 2 OSC PWM VCC OCP & UVLO OCP 0 PHASE + - COMP/SS Figure 3 4 SC2608 BST VCC LEVEL DH SHIFT PHASE NON-OVERLAP TIMING 0 Vcc DL GND 0 0 www.semtech.com ...
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... SC2608 ...
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... OCP Hiccup OCP Hiccup OCP Hiccup OCP Hiccup In the event that an overcurrent is detected, the SC2608 latches the fault and begins a hiccup cycle. Switching is immediately stopped, and the drivers are set to a tristate condition (Both DH and DL are low). COMP is slowly discharged to 300mV with an internal 1.5uA current source, providing a long cooldown time to keep power dissipation low in the event of a continuous dead short ...
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... SENSE is high(above 300mV) is high while COMP is low, then the SC2608 turns on the low side FET to discharge the output before changing to shutdown or soft-start mode. The low side FET turns off when SENSE drops below 300mV and the converter remains in the tri- state condition until COMP is released ...
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... R F zero SC2608 soft start time is determined by the compensation capacitor. Capacitance can be adjusted to satisfy the soft start requirement. (6) The final step is to generate the Bode plot by using the simulation model in Fig using the equations provided here with Mathcad. The phase margin can then be checked using the Bode plot ...
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... SC2608 Frequency vs. Temperature - 100 Temperature(℃) UVLO vs. Temperature - 100 Temperarure( ℃ ) Icc vs. Temperature - 100 Temperature( ℃ ) UVLO_Hysteresis vs. Temperature - 100 Temperature(℃ ...
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... SC2608 +12V/+5V/+3. 1.6VOUT/20A L1 1.2uH C10 C11 VOUT = 0.8V X (R3+R6)/ ...
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... Gate waveforms DH DH Phase node Phase node sustain loading © 2005 Semtech Corp. Start up Vin Vin Vin Comp/ ss Comp/ ss Comp VOUT VOUT VOUT Over Current Protection (33A DC tripped) OCP HICCUP VIN Comp/SS DH VOUT 11 SC2608 VIN Comp/ss DH VOUT www.semtech.com ...
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... SC2608 5VDual 1.8VOUT/24A C8 C9 C10 C11 C12 C13 ...
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... SC2608 20VIN 5VOUT/8A 2.2uH 2R2 ...
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... SC2608 ...
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... COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. Contact Information Phone: (805)498-2111 FAX (805)498-3804 © 2005 Semtech Corp. DIM INCHES (.205 .118 .050 X .024 Y .087 Y .291 Z Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 15 SC2608 DIMENSIONS MILLIMETERS (5.20) 3.00 1.27 0.60 2.20 7.40 www.semtech.com ...