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SS6578 数据表(PDF) 9 Page - Silicon Standard Corp. |
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SS6578 数据表(HTML) 9 Page - Silicon Standard Corp. |
9 / 11 page www.SiliconStandard.com 9 of 11 SS6578 VIN 1 DUTY 2 SHDN 3 FB 4 GND 5 DRI 6 CS- 7 CS+ 8 U1 SS6578 R3 47K R4 27K C2 0.1uF +VIN = 5~18V +VOUT, 3.3V Rs + C4 470 µF D1 SS32 + C1 100 µF L1 33 µH R6 1M Q1 SSM4435 R7 * Q2 R1 3K3 C3 1 µF D2 LL4148 R2 100K <15V *** * VIN>15V, R7=15Ω VIN≤15V, R7=0Ω* *** R6 can adjust the duty cycle max. It can be 0 Ω Fig 11. DC/DC Buck Converter VOUT=3.3V B. Short Circuit Protection Design 1. As we know, Short Circuit Protection (abbreviated as SCP) does not always exist in the DC-DC converter circuit. The fact is usually the DC-DC converter provides the circuits attached to VOUT with low power or low voltage. Sometimes there is less concern about safety, as the probability of short-circuit is quite low. That gives users reasons to ignore the use of an SCP circuit. However, we would still like to point out the importance of the protection. With SCP, the system will be well protected in any situation. Two SCP circuits are introduced as follows for your reference. 2. Design1: shown as Fig. 12. Method: Add a fast fuse to VOUT. A fuse can be selected to pass the start up current, but open quickly with a large unexpected current. Of course, replacement of the fuse is needed after short circuit. 3. Design 2: shown as Fig. 13. Method: Add a SCP circuit Note: 1. The time constant, which is directly related to R1 and C1, has a serious effect on the circuit. 2. Circuit can be recovered by removing the short circuit event from the system. 3. The condition for applying this design is VOUT ≥3V. Rev.2.02 4/06/2004 |
类似零件编号 - SS6578 |
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类似说明 - SS6578 |
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