sc2612 Semtech Corporation, sc2612 Datasheet
sc2612
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sc2612 Summary of contents
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... SC2612 is avail- able with fixed switching frequencies of 600kHz (SC2612A) and 200kHz (SC2612C). The SC2612 has soft start and enable functions and is short circuit protected. The output of the switcher may be set anywhere between 0.8V and 75% of Vin. Short circuit protection is disabled during start-up to allow the output capacitors time to fully charge ...
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... C MAX SC2612A ...
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... SC2612A ± µ www.semtech.com ...
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... VREF UVLO + - SHDN OSCILLAT OR + SSOVER - 4 SC2612A ...
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... POWER MANAGEMENT Theory of Operation The SC2612 is a step down DC/DC controller designed for minimum cost and size without sacrificing accuracy and protection. Overcurrent protection is implemented by a simple undervoltage detection scheme and is dis- abled until soft start has been completed to eliminate false trips due to output capacitor charging. The SS/EN pin is held low, as are the DH and DL pins, until the undervoltage lockout points are exceeded ...
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... This objective is most simply met by generating asymp- totic bode plots of the small signal response of the vari- ous sections of the converter. SC2612 AND FETS REF MODULATOR + EA FB ...
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... E 60 Compensated Error Amp gain Fp(lc) 0 Fz(esr) -20 Filter+modulator +divider gain -40 -60 100.0E+0 1.0E+3 10.0E+3 Frequency (Hz) Fig2: Type 2 Error Amplifier Compensation 2003 Semtech Corp. y due to EA rolloff ) Fz1 Fp1 Total open loop gain Fco D 100.0E+3 1.0E+6 7 SC2612A/C www.semtech.com ...
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... POWER MANAGEMENT Layout Guidelines Careful attention to layout requirements are necessary for successful implementation of the SC2612 PWM con- troller. High currents switching at high frequency are present in the application and their effect on ground plane voltage differentials must be understood and minimized. 1). The high power parts of the circuit should be laid out first ...
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... Cout only, and connections between Cout and the load must be short, wide copper areas to minimize inductance and resistance. 5) The SC2612 is best placed over a quiet ground plane area, avoid pulse currents in the Cin, Q1, Q2 loop flowing in this area. PGNDH and PGNDL should be returned to the ground plane close to the package ...
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... BST 18V for V = 12V BST IN 1.498 1.496 1.494 1.492 1.490 Typical Line Regulation 0.0% -0.5% -1.0% -1.5% -2.0% 0 0.8 1.0 1.2 Typical Load Regulation 10 SC2612A/C = 18V BST ( 12V for V BST V = 18V for V BST V = 12V (A) O www.semtech.com ...
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... GND J7 2003 Semtech Corp. GND J5 12V 0.1uF C2 10uF VCC BST Si4410DY R3 2 COMP SS/ GND FB Q2 Si4410DY SC2612 D1 C9 EMPTY 0.1uF 11 SC2612A 1500uF 1500uF 1500uF Q1 L1 1uH 1.5V OUT 6.98k 1500uF C10 R8 8.06k 1500uF GND J8 www.semtech.com ...
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... POWER MANAGEMENT Outline Drawing - MSOP-8 Land Pattern - MSOP-8 Contact Information Phone: (805)498-2111 FAX (805)498-3804 2003 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 12 SC2612A/C www.semtech.com ...