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L5991 Datasheet(PDF) 3 Page - STMicroelectronics |
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L5991 Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 19 page ELECTRICAL CHARACTERISTICS (VCC = 15V; Tj = 0 to 105 °C; RT = 13.3kΩ (*) CT = 1nF; unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit REFERENCE SECTION VREF Output Voltage Tj =25 °C; IO = 1mA 4.925 5.0 5.075 V Line Regulation VCC = 12 to 20V; Tj =25 °C 2.0 10 mV Load Regulation IO = 1 to 10mA; Tj =25 °C 2.0 10 mV TS Temperature Stability 0.4 mV/ °C Total Variation Line, Load, Temperature 4.80 5.0 5.130 V IOS Short Circuit Current Vref = 0V 30 150 mA Power Down/UVLO VCC = 6V; Isink = 0.5mA 0.2 0.5 V OSCILLATOR SECTION Initial Accuracy pin 15 = Vref; Tj =25 °C Vcomp = 4.5V 95 100 105 kHz pin 15 = Vref; VCC = 12 to 20V Vcomp = 4.5V 93 100 107 kHz pin 15 = Vref; VCC = 12 to 20V Vcomp =2V 46.5 50 53.5 kHz Duty Cycle pin 3 = 0,7V, pin 15 = VREF pin 3 = 0.7V, pin 15 = OPEN 0 0 % % pin 3 = 3.2V, pin 15 = VREF pin 3 = 3.2V, pin 15 = OPEN 47 93 % % Duty Cycle Accuracy pin 3 = 2.79V, pin 15 = OPEN 75 80 85 % Oscillator Ramp Peak 2.8 3.0 3.2 V Oscillator Ramp Valley 0.75 0.9 1.05 V ERROR AMPLIFIER SECTION Input Bias Current VFB to GND 0.2 3.0 µA VI Input Voltage VCOMP =VFB 2.42 2.5 2.58 V GOPL Open Loop Gain VCOMP = 2 to 4V 60 90 dB SVR Supply Voltage Rejection VCC = 12 to 20V 85 dB VOL Output Low Voltage Isink = 2mA 1.1 V VOH Output High Voltage Isource = 0.5mA, VFB = 2.3V 5 6 V IO Output Source Current VCOMP > 4V, VFB = 2.3V 0.5 1.3 2.5 mA Output Sink Current VCOMP = 1.1V, VFB = 2.7V 2 6 mA Unit Gain Bandwidth 1.7 4 MHz SR Slew Rate 8 V/ µs PWM CURRENT SENSE SECTION Ib Input Bias Current Isen =0 3 15 µA IS Maximum Input Signal VCOMP = 5V 0.92 1.0 1.08 V Delay to Output 70 100 ns Gain 2.85 3 3.15 V/V Vt Fault Threshold Voltage 1.1 1.2 1.3 V SOFT START SECTION ISSC SS Charge Current Tj =25 °C 142026 µA ISSD SS Discharge Current VSS = 0.6V Tj =25 °C 5 10 15 µA VSSSAT SS Saturation Voltage DC = 0% 0.6 V VSSCLAMP SS Clamp Voltage 7 V LEADING EDGE BLANKING Internal Masking Time 100 ns OUTPUT SECTION VOL Output Low Voltage IO = 250mA 1.0 V VOH Output High Voltage IO = 20mA; VCC = 12V 10 10.5 V IO = 200mA; VCC = 12V 9 10 V VOUT CLAMP Output Clamp Voltage IO = 5mA; VCC = 20V 13 V Collector Leakage VCC = 20V VC = 24V 2 20 µA (*) RT =RA//RB,RA =RB = 27k Ω, see Fig. 22. L5991 - L5991A 3/23 |
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