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SP6134CU OVER CURRENT LIMIT PROTECTION APPLICATION SCHEMATIC
The SP6134CU provides short circuit protection by sensing the output voltage at
ground. However for a better and robust over current clamping protection, a comparator
circuit could be used. A simplifies over current clamping circuit block diagram is shown
on Figure 14. The output current clamping threshold and RC filter time constant
resistors and capacitors component selections are approximately by the following
equations (1) and (2).
Iout_limit ? (R/R’)(VCC/Rdc)
…………………………………… (1)
L/Rdc ? 2RC
…………………………………………………… (2)
It is strongly recommend setting the over current limit threshold 130 to 150% of the
maximum output load current for reliable operation under all operational condition. In
Figure 15. application example, the over current limit is set at around 5A. Note that the
comparator VCC is derived from the +5V Low Drop Out (LDO) Bias Supply output.
Figure 15 shows SP6134CU Evaluation Board integrates with external SPX5205 LDO
for +5V VCC bias supply and output over current limit clamp comparator application
circuitry. Note that the over current limit comparator referent voltage is derived from
LDO output voltage. In addition, an external Power Schottky Diode DS (STPS2L25U) is
added in parallel with Drain to Source of the Synchronous MOSFET in order to improve
the efficiency of the converter at high output current application especially.
Figure 14. Simple Over Current Clamping Protection Circuit Block Diagram
7
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相关代理商/技术参数
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