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SI9102DN02-T1 数据表(PDF) 5 Page - Vishay Siliconix |
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SI9102DN02-T1 数据表(HTML) 5 Page - Vishay Siliconix |
5 / 10 page Document Number: 70001 S-70497-Rev. H, 19-Mar-07 www.vishay.com 5 Vishay Siliconix Si9102 PIN CONFIGURATIONS DETAIL DESCRIPTION Pre-Regulator/Start-Up Section Due to the low quiescent current requirement of the Si9102 control circuitry, bias power can be supplied from the unreg- ulated input power source, from an external regulated low- voltage supply, or from an auxiliary "bootstrap" winding on the output inductor or transformer. When power is first applied during start-up, + VIN will draw a constant current. The magnitude of this current is determined by a high-voltage depletion MOSFET device which is con- nected between + VIN and VCC. This start-up circuitry pro- vides initial power to the IC by charging an external bypass capacitance connected to the VCC pin. The constant current is disabled when VCC exceeds 9.4 V. If VCC is not forced to exceed the 9.4 V threshold, then VCC will be regulated to a nominal value of 9.4 V by the pre-regulator circuit. As the supply voltage rises toward the normal operating con- ditions, an internal undervoltage (UV) lockout circuit keeps the output MOSFET disabled until VCC exceeds the under- voltage lockout threshold (typically 8.8 V). This guarantees that the control logic will be functioning properly and that suf- ficient gate drive voltage is available before the MOSFET turns on. The design of the IC is such that the undervoltage lockout threshold will not exceed the pre-regulator turn-off voltage. Power dissipation can be minimized by providing an external power source to VCC such that the constant current source is always disabled. Note: During start-up or when VCC drops below 9.4 V the start-up circuit is capable of sourcing up to 20 mA. This may lead to a high level of power dissipation in the IC (for a 48 V input, approximately 1 W). Excessive start-up time caused by external loading of the VCC supply can result in device damage. Figure 4 gives the typical pre-regulator current at start-up as a function of input voltage. PDIP-14 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Top View PLCC-20 14 15 16 17 18 8 7 6 5 4 1 2 319 20 11 10 913 12 Top View PIN DESCRIPTION Function Pin 14-Pin DIP 20-Pin PLCC* BIAS 1 2 + VIN 23 DRAIN 3 5 SOURCE 4 7 - VIN 58 VCC 69 OSC OUT 7 10 OSC IN 8 11 DISCHARGE 9 12 VREF 10 14 SHUTDOWN 11 16 RESET 12 17 COMP 13 18 FB 14 20 *Pins 1, 4, 6, 13, 15, and 19 = N/C ORDERING INFORMATION Standard Part Number Lead (Pb)-free Part Number Temperature Range Package Si9102DJ02 Si9102DJ02-E3 - 40 to 85 °C PDIP-14 Si9102DN02 Si9102DN02-E3 PLCC-20 Si9102DN02-T1 (With Tape and Reel) Si9102DN02-T1-E3 (With Tape and Reel) |
类似零件编号 - SI9102DN02-T1 |
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类似说明 - SI9102DN02-T1 |
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