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L6598 データシート(PDF) 11 Page - STMicroelectronics |
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L6598 データシート(HTML) 11 Page - STMicroelectronics |
11 / 17 page 11/17 L6598 3.4 OP AMP Section The integrated OP AMP is designed to offer Low Output Impedance, wide band, High input Impedance and wide Common Mode Range. It can be readily used to implement protection features or a closed loop control. For this purpose the OP AMP Output can be properly connected to Rfmin pin to adjust the oscillation frequency. 3.5 Comparators Two CMOS comparators are available to perform protection schemes. Short pulses (>= 200ns) on Comparators Input are recognised. The EN1 input (active High), has a threshold of 0.6V (typical value) forces the device in a latched shut down state (e.g. LVG Low, HVG low, Oscillator stopped), as in the Under Voltage Conditions. Nor- mal Operating conditions are resumed after a power-off power-on sequence. The EN2 input (active high), with a threshold of 1.2V (typical value) restarts a Soft Start sequence (see Timing Diagrams). In addition the EN2 Comparator, when activated, removes a latched shutdown caused by EN1. Figure 15. Switching Time Waveform Definitions Figure 16. Dead Time and Duty Cycle Waveform Definition 90% 90% 10% 10% tf tr LVG 90% 90% 10% 10% tf tr HVG D98IN898 LVG HVG t d 50% 50% t d 50% 50% T1 50% Tperiod Dc = Tperiod T1 D98IN899 |
同様の部品番号 - L6598_04 |
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同様の説明 - L6598_04 |
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