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VIPER27LD Datasheet(PDF) 7 Page - STMicroelectronics |
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VIPER27LD Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 31 page  VIPER27 Electrical data Doc ID 15133 Rev 5 7/31 Table 8. Controller section Symbol Parameter Test condition Min Typ Max Unit Feed-back pin VFBolp Over load shutdown threshold 4.5 4.8 5.2 V VFBlin Linear dynamics upper limit 3.2 3.5 3.7 V VFBbm Burst mode threshold Voltage falling 0.6 V VFBbmhys Burst mode hysteresis Voltage rising 100 mV IFB Feed-back sourced current VFB = 0.3 V -150 -200 -280 μA 3.3 V < VFB < 4.8 V -3 μA RFB(DYN) Dynamic resistance VFB < 3.3 V 14 21 k Ω HFB ΔV FB / ΔID 26 V/A CONT pin VCONT_l Low level clamp voltage ICONT = -100 µA 0.5 V Current limitation IDlim Max drain current limitation VFB = 4 V, ICONT = -10 µA TJ = 25 °C 0.66 0.7 0.74 A tSS Soft-start time 8.5 ms TON_MIN Minimum turn ON time 220 400 480 ns td Propagation delay 100 ns tLEB Leading edge blanking 300 ns ID_BM Peak drain current during burst mode VFB = 0.6 V 160 mA Oscillator section FOSC VIPER27L VDD = operating voltage range, VFB = 1 V 54 60 66 kHz VIPER27H 103 115 127 kHz FD Modulation depth VIPER27L ±4 kHz VIPER27H ±8 kHz FM Modulation frequency 250 Hz DMAX Maximum duty cycle 70 80 % Over current protection (2nd OCP) IDMAX Second over current threshold 1 A Overvoltage protection VOVP Overvoltage protection threshold 2.7 3 3.3 V TSTROBE Overvoltage protection strobe time 2.2 us |
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