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L4972A Datasheet(PDF) 6 Page - STMicroelectronics |
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L4972A Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 22 page L4972A 6/22 4 Electrical Characteristcs Table 5. Electrical Characteristcs Refer to the test circuit, TJ = 25°C, Vi = 35V, R4 = 30KΩ, C9 = 2.7nF, fSW = 100KHz typ, unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit Fig. DYNAMIC CHARACTERISTICS Vi Input Volt. Range (pin 11) Vo = Vref to 40V Io = 2A (**) 15 50 V 8 Vo Output Voltage Vi =15V to 50V Io= 1A; Vo = Vref 5 5.1 5.2 V 8 ∆Vo Line Regulation Vi =15V to 50V Io = 0.5A; Vo= Vref 12 30 mV ∆Vo Load Regulation Vo = Vref Io= 0.5A to 2A 7 20 mV Vd Dropout Voltage between Pin 11 and 20 Io = 2A 0.25 0.4 V I20L Max Limiting Current Vi = 15V to 50V Vo= Vref to 40V 2.5 2.8 3.5 A η Efficiency (*) Io = 2A, f = 100KHz Vo = Vref Vo = 12V 75 85 90 % % SVR Supply Voltage Ripple Rejection Vi = 2VRMS; Io= 1A f = 100Hz; Vo= Vref 56 60 dB 8 f Switching Frequency 90 100 110 KHz 8 ∆f/∆Vi Voltage Stability of Switching Frequency Vi = 15V to 45V 2 6 % 8 ∆f/Tj Temperature Stability of Switching Frequency Tj = 0 to 125°C 1 % 8 fmax Maximum Operating Switching Frequency Vo= Vref R4 = 15KΩ Io = 2A C9= 2.2nF 200 KHz 8 (*) Only for DIP version (**) Pulse testing with a low duty cycle Vref SECTION (pin 13) V13 Reference Voltage 5 5.1 5.2 V 10 ∆V13 Line Regulation Vi = 15V to 50V 10 25 mV 10 ∆V13 Load Regulation I13 = 0 to 1mA 20 40 mV 10 ∆V13 /∆T Average Temperature Coefficient Reference Voltage Tj = 0°C to 125°C 0.4 mV/°C 10 I13 short Short Circuit Current Limit V13 = 0 70 mA 10 VSTART SECTION (pin 15) V14 Reference Voltage 11.4 12 12.6 V 10 ∆V14 Line Regulation Vi = 15 to 50V 0.6 1.4 V 10 ∆V14 Load Regulation I14 = 0 to 1mA 50 200 mV 10 I14 short Short Circuit Current Limit V15 = 0V 80 mA 10 DC CHARACTERISTICS V11on Turn-on Threshold 10 11 12 V 12 V11 Hyst Turn-off Hysteresys 1 V 12 I11Q Quiescent Current V8 = 0; S1 = D 13 19 mA 12 I11OQ Operating Supply Current V8 = 0; S1 = B; S2 = B 16 23 mA 12 |
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