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SI9124 Folha de dados(PDF) 2 Page - Vishay Siliconix |
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SI9124 Folha de dados(HTML) 2 Page - Vishay Siliconix |
2 / 16 page Si9124 Vishay Siliconix New Product www.vishay.com 2 Document Number: 72099 S-03638—Rev. B, 20-Mar-03 DESCRIPTION (CONTINUED) Si9124 has advanced current monitoring circuitry to permit the user to set the maximum current in the primary circuit. Such a feature acts as protection against output shorts. Upon sensing an overload condition, the converter is shut off for a period of time and then soft-start cycle is re-initiated, achieving hiccup mode operation. Current sensing is by means of a sense resistor on the primary device. An integrated over-temperature shutdown circuit also protects the system. The 100-V depletion mode MOSFET integrated pre-regulator circuit permits direct operation from input voltage with only one series resistor during startup. The pre-regulator automatically disconnects from the input supply when the output voltage is established by means of a feedback winding from the filter inductor. Si9124 is available in TSSOP-16 pin package. In order to satisfy the stringent ambient temperature requirements, Si9124 is rated to handle the industrial temperature range of –40 to 85 _C. DETAILED BLOCK DIAGRAM 1.65 V VFF - + Pre-Regulator - + - + VINDET VREF VIN + - 2.2 R EP - + PWM Comparator SS - + CS2 CS1 Over Current Protection GND VUVLO VUV VSD VCC Hiccup Mode Start Driver Control and Timing OTP OSC ROSC Ramp SEC_SYNC PGND OUTA SEC_SYNC Driver Primary B Driver Level Shift VCC2 PGND2 Si9124 Peak DET R I VREF Error Amplifier 4I Primary A Driver Gain VCC VCC Figure 2. 8.8 V 550 mV OUTB |
Nº de peça semelhante - SI9124 |
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Descrição semelhante - SI9124 |
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