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SS6578 Scheda tecnica(PDF) 8 Page - List of Unclassifed Manufacturers |
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SS6578 Scheda tecnica(HTML) 8 Page - List of Unclassifed Manufacturers |
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8 / 11 page  www.SiliconStandard.com 8 of 11 SS6578 APPLICATION INFORMATION A. Start Up Design In order to eliminate the over-shoot issue which happens when Vout is under 5V, we offer two solutions for the SS6578 as a buck controller. 1. Buck Converter with 12V<Vin<18V When the SS6578 is used in a Buck Circuit with VOUT<5V, add a resistor R1 of 680 ohm and a Zener diode D2 of 6.8V. This solution will limit the temperature rise of MOSFET Q1. The smaller the resistor value, the lower temperature rise. The resistor value is determined by the reverse current rating of the Zener diode. Refer to its databook for the reverse current rating. Note that the current is strictly limited by the spec. A temperature rise of 1 °C for Q1 results from the addition of R1=680ohm, D2=6.8V to the original condition (Vin=12V, Vout=3.3V and IOUT=1.5A). Yet, the efficiency of the system remains nearly the same. Note: The input voltage rating in this circuit is 12V rather than 4V, and the rating can be varied depending on the value of Zener diode D2. Please refer to Fig3. The current-sense resistor Rs is used for over-current protection. Due to concerns about the power loss, cost, and size, many users do not use Rs in their buck converter application. Damage caused by unexpected current (over rating current) could be done to Q1, U1 and the circuits attached to VOUT when Rs is not used. For the calculation of Rs, please refer to the formula of Rs in “Typical Application” above. VIN 1 DUTY 2 SHDN 3 FB 4 GND 5 DRI 6 CS- 7 CS+ 8 U1 SS6578 R2 47K R3 27K C2 0.1 µF 12V< +VIN <15V +VOUT, 3.3V + C4 330 µF D1 SS32 + C1 100 µ D2 6.8V R1 680 Rs Q1 SSM4435 L1 33 µH Fig. 10 DC/DC Buck Converter VOUT=3.3V Rev.2.02 4/06/2004 |
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