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LM3450 数据表(PDF) 5 Page - National Semiconductor (TI) |
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LM3450 数据表(HTML) 5 Page - National Semiconductor (TI) |
5 / 28 page Symbol Parameter Conditions Min (Note 4) Typ (Note 5) Max (Note 4) Units K M Multiplier Gain (Includes Internal Resistor Divider) V AC = 3V, VCMP = V THM+1.5V 0.5 1/V ZERO CURRENT DETECTOR (ZCD) V ZCD-RIS ZCD Input Threshold V ZCD Rising 1.45 1.5 1.55 V Hysteresis 150 200 250 mV Delay to Output 135 ns V ZCD-H Positive Clamp Voltage I ZCD = 1mA 6.0 V V ZCD-L Negative Clamp Voltage I ZCD = -50µA 0.61 PWM COMPARATOR (CS) V OS PWM Comparator Input Offset Voltage 30 mV PWM Comparator Input Bias Current 20 nA V LIM CS Current Limit Threshold 1.40 1.50 1.60 V CS Delay to Output 100 ns CS Blanking Sinking Impedance 1 k Ω t LEB Leading Edge Blanking (LEB) Time 140 ns ANALOG ADJUST INPUT (V ADJ) V ADJ-LP V ADJ Low Threshold (Low Power Mode) VADJ Falling 56 75 mV V ADJ Low Hysteresis 50 V ADJ Pull-up Current Source 1 µA V ADJ Open Voltage V ADJ Open 3 V DYNAMIC HOLD CIRCUIT (HOLD, I SEN) R DSON-HD HOLD MosFET On-Resistance ISEN Short to GND 22 30 42 Ω V SEN-REF I SEN Reference Voltage 162 200 232 mV I SEN Bias Current 5 µA PRE-REGULATOR GATE DRIVE OUTPUT (BIAS) V BIAS BIAS High Voltage @ 100µA V CC < VCC-FALL 18.8 21 22.6 V BIAS Low Voltage @ 100µA V CC > VCC-RISE 13.5 14 14.5 GATE DRIVER OUTPUT (GATE) V GATE-H GATE Voltage High I GATE = 20mA 11.5 V I GATE = 200mA 10.5 GATE Pull Down Resistance 2 8 Ω GATE Peak Current (Note 6) ±1.5 A REFERENCE VOLTAGE OUTPUT (V REF) V REF Reference Voltage No Load 2.85 3 3.15 V Current Limit 1.5 2.0 3.0 mA DIMMING OUTPUT (DIM, FLT1, FLT2) FLT1 Output Impedance Standby Mode 500 k Ω Transition Mode 1.6 Triangle Waveform Compared to FLT2 High 1.49 V Low 15 mV f DIM DIM Frequency 180 460 700 Hz OFF-TIMERS t OFF-MAX Maximum Off-Time (Normal Operation) 340 µs t OFF-LP Off-Time (Low Power Mode) 42 5 www.national.com |
类似零件编号 - LM3450 |
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类似说明 - LM3450 |
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