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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN2208 датащи(PDF) 48 Page - STMicroelectronics |
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AN2208 датащи(HTML) 48 Page - STMicroelectronics |
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48 / 51 page  7 Test results AN2208 48/51 C.3 L5970D DC/DC converter load test results The DC/DC converter was tested with a constant output current with resistive load. The Waveform on coil L1 has to be clear without overshot (see Figure 61., Figure 63.). Input/output voltage ripple depends on ESR capacitor values. Only low ESR capacitors have been used on VSS and VOUT. Test conditions ● Resistive load = 12 Ω. ● Input voltages VSS = 8, 12, and 24V. ● Output voltage VBSS = 5V ● Output current IOUTDC = 0.4A ● Ambient Temperature (TA) = 25°C Test results: If output current is increase up to 1.4 A, then the current limiter will be active. Output voltage ripple can be seen in Figure 62. The maximum value of ripple is 93 mV. The efficiency measurement results are shown in Figure 58. Table 14. L5970D electrical characteristics Symbol Parameter Min. Typ. Max. Unit VSS Operating input voltage 6.6 35 V IQOP Total operating quiescent current 2.4 5 mA IOUTDC Maximum limiting current 1.0 1.4 A fS Switching frequency 243 250 kHz d Duty cycle 0 100 % TA Operating Temperature Range –25 to 85°C °C PTOTDC Power dissipation at Tamb = 60°C 0.75 W Figure 58. Efficiency vs. output current |
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