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LM2657 Scheda tecnica(PDF) 7 Page - Texas Instruments |
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LM2657 Scheda tecnica(HTML) 7 Page - Texas Instruments |
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7 / 36 page  LM2657 www.ti.com SNVS342B – JANUARY 2005 – REVISED MARCH 2013 ELECTRICAL CHARACTERISTICS (continued) Specifications with standard typeface are for TJ = 25°C, and those with boldface apply over full Operating Junction Temperature range. VDD = V5 = 5V, VSGND = VPGND = 0V, VIN = 15V, VEN = 3V, RFADJ = 22.1kΩ unless otherwise stated (1). Datasheet min/max specification limits are specified by design, test, or statistical analysis. Symbol Parameter Conditions Min Typical(2) Max Units Error Amplifier GAIN DC Gain 70 dB VSLEW Voltage Slew Rate COMP rising 4.45 V/µs COMP falling 2.25 BW Unity Gain Bandwidth 6.5 MHz ICOMP_SOURCE COMP Source Current VFB = lower COMP = 0.5V 2 5 mA ICOMP_SINK COMP Sink Current VFB = higher than internal 7 14 mA reference COMP = 5V Current Limit and Zero-Cross IILIM ILIM Pin Current (sourcing, VILIM1 = VILIM2 = 0V 46 62 76 µA either ILIM pin) VILIM_TH ILIM Threshold Voltage -10 0 10 mV VSW_ZERO Zero-cross Threshold (SW LDRV goes low -2.2 mV Pin) Oscillator FOSC PWM Frequency RFADJ = 22.1kΩ 255 300 345 kHz RFADJ = 12.4kΩ 500 RFADJ = 30.9kΩ 200 VRAMP PWM Ramp Peak-to-peak VIN = 4.5V 0.48 V Amplitude VIN = 15V 1.6 VIN = 28V 3.0 VVALLEY PWM Ramp Valley 0.8 V ΔFOSC_VIN Frequency Change with VIN VIN = 4.5V to 28V ±1 % ΔFOSC_VDD Frequency Change with VDD = 4.5V to 5.5V ±2 % VDD øCH Phase Shift Between Phase from HDRV1 to HDRV2 165 180 195 deg Channels VFREQ_VIN FREQ Pin Voltage vs. VIN 0.107 V/V System ton-min Minimum ON Time VFPWM = 3V 30 ns DMAX VIN = 4.5V 60 70 % Maximum Duty Cycle VIN = 15V 40 50 % VIN = 28V, VDD= 4.5V 24 30 % Gate Drivers RHDRV_SOURC HDRV Source Impedance HDRV Pin Current (sourcing)= 7 Ω E 1.2A RHDRV_SINK HDRV Sink Impedance HDRV Pin Current (sinking) = 2 Ω 1A RLDRV_SOURC LDRV Source Impedance LDRV Pin Current (sourcing) = 7 Ω E 1.2A RLDRV_SINK LDRV Sink Impedance LDRV Pin Current (sinking) = 1 Ω 2A tDEAD Cross-conduction Protection HDRV Falling to LDRV Rising 40 ns Delay (deadtime) LDRV Falling to HDRV Rising 70 Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2657 |
Codice articolo simile - LM2657_15 |
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Descrizione simile - LM2657_15 |
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