SC1405B Semtech Corporation, SC1405B Datasheet
SC1405B
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SC1405B Summary of contents
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... A CMOS output provides status indication of the 5V supply. A low enable input places the IC in stand- by mode, reducing supply current to less than 10µA. SC1405B is offered in a high pitch (.025” lead spacing) TSSOP package. Typical Application Circuit INPUT POWER, 5-20V ...
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... µ SC1405B < ...
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... ° SC1405B ...
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... POWER MANAGEMENT Timing Diagrams 2004 Semtech Corp. 5 SC1405B www.semtech.com ...
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... µ SC1405B ...
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... Class- D amplifiers. Theory of Operation The control input (CO) to the SC1405B is typically sup- plied by a PWM controller that regulates the power sup- ply output. (See Application Evaluation Schematic, Fig- ure 3). The timing diagram demonstrates the sequence 2004 Semtech Corp ...
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... FET. This is assuming that the impedance of the drive path is too high compared to the instantaneous imped- ance of the capacitors. (since dV/dT and thus the effec- tive frequency is very high). If the BG pin of the SC1405B is very close to the bottom FET, Vspike will be reduced depending on trace inductance, rate if rise of current,etc. ...
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... MOSFETs will reduce lead induc- tance and their parasitic effects. ASYNCHRONOUS OPERATION The SC1405B can be configured to operate in Asynchro- nous mode by pulling S-MOD to logic LOW, thus disabling the bottom FET drive. This has the effect of saving power at light loads since the bottom FET’s gate capacitance does not have to charged at the switching frequency ...
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... Figure 3: PWM input and Gate drive and phase node switching waveforms with time scale expanded. The MOSFETs driven are shown on Figure 4 (Evaluation Board Schematic) Ch1: PWM input signal Ch2: Top Gate Drive Ch3: Phase (Switching) Node Ch4: Bottom Gate 10 SC1405B www.semtech.com ...
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... TION EVAL AL AL ALU TION BO AL 1000uf,16V 1u,16V 2004 Semtech Corp. TION BO TION BO TION BO TION BOARD SCHEMA ARD SCHEMATIC ARD SCHEMA ARD SCHEMA ARD SCHEMA TIC TIC TIC TIC Controller. SC2422 the disables OFF VIDs All 11 SC1405B www.semtech.com ...
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... 2004 Semtech Corp SC1405B ...
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... POWER MANAGEMENT Outline Drawing -TSSOP-14 Land Pattern - TSSOP-14 Contact Information Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 13 SC1405B www.semtech.com ...