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VIPER38LD 数据表(PDF) 9 Page - STMicroelectronics |
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VIPER38LD 数据表(HTML) 9 Page - STMicroelectronics |
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9 / 31 page ![]() DocID025703 Rev 2 9/31 VIPER38 Electrical characteristics 31 Table 8. Controller section Symbol Parameter Test condition Min Typ Max Unit Feed-back pin VFBolp Overload shutdown threshold 4.5 4.8 5.2 V VFBlin Overload detection threshold 3.2 3.5 3.7 V VFBbm Burst mode threshold Voltage falling 0.54 0.6 0.66 V VFBbmhys Burst mode hysteresis Voltage rising 90 mV IFB1 Feedback sourced current VFB = 0.3 V -150 -200 -280 uA IFB2 Feedback current-OLP delay VFBlin < VFB < VFBolp -3 uA RFB(DYN) Dynamic resistance VFB < 3.3 V 14 21 k Ω HFB ∆V FB / ∆ID 0.5 2 V/A CONT pin VCONT_l Low-level clamp voltage ICONT = -100 µA 0.4 0.5 0.6 V VCONT_h High-level clamp voltage ICONT = 1 mA 5 5.5 6 V Current limitation IDlim Max drain current limitation VFB = 4 V, ICONT = -10 µA TJ = 25 °C 1.07 1.15 1.23 A tSS Soft-start time 7.6 8.5 9.4 ms tON_MIN Minimum turn-on time 220 400 480 ns td Propagation delay (1) 20 ns tLEB Leading edge blanking (1) 380 ns ID_BM Peak drain current during burst mode VFB = 0.6 V 115 190 265 mA Oscillator section FOSC VFB = 1 V VIPER38L 54 60 66 kHz VIPER38H 103 115 127 kHz FD Modulation depth VIPER38L ±4 kHz VIPER38H ±8 kHz FM Modulation frequency 830 920 1010 Hz DMAX Maximum duty cycle 70 80 % Overcurrent protection (2nd OCP) IDMAX Second overcurrent threshold 1.7 A Overvoltage protection VOVP Overvoltage protection threshold 2.7 3 3.3 V tSTROBE Overvoltage protection strobe time 1.5 2 2.5 µs |
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