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LM3492HCMH Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM3492HCMH Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 29 page VIN CDHC LM3492HC LM3492HC-Q1 VCC EN SW RT VOUT FB PGND GND COMM DIM1/CLK DIM2 IREF ILIM LGND IOUT1 IOUT2 RRT L1 CFB RFB1 COUT RFB2 RIREF CVCC RCOMM CCDHC CIN Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3492HC-Q1, LM3492HC SNVS797B – MARCH 2012 – REVISED OCTOBER 2015 LM3492HC/-Q1 Two-Channel, Individual Dimmable, LED Driver With Boost Converter and Fast Current Regulator 1 Features 2 Applications 1 • Boost Converter • Ultra-High Contrast Ratio 6.5” to 10” LCD Display Backlight up to 28 LEDs – Automotive Grade Product, Q100 Grade-1 • Automotive or Marine GPS Display Qualified – Very Wide Input Voltage Range: 4.5 V to 65 V 3 Description – Programmable Soft-Start Period The LM3492HC/-Q1 device integrates a boost – No Loop Compensation Required converter and a two-channel current regulator to – Stable with Ceramic and Other Low ESR implement a highly efficient and cost effective LED Capacitors with No Audible Noise driver. This device drives two individually dimmable LED strings with a maximum power of 15 W and an – Nearly Constant Switching Frequency output voltage of up to 65 V. The boost converter Programmable from 200 kHz to 1 MHz employs a proprietary projected-on-time control • Current Regulator method to give a fast transient response with no – Programmable LED Current: 50 mA to 250 mA compensation required. The nearly constant switching frequency can be set to a level from 200 – 10000:1 Contrast Ratio, 300-ns Minimum kHz to 1 MHz. Ceramic capacitors stabilize the Pulse Width application circuit and produce no audible noise on – Two Individual Dimmable LED Strings up to dimming. The programmable peak current limit and 65 V, Total 15 W (Typically 28 LEDs at soft-start features reduce current surges at start-up. 150 mA) An integrated, 190-m Ω, 3.9-A, N-Channel MOSFET switch minimizes the solution size. The fast slew rate – Dynamic Headroom Control Maximizes current regulator allows high frequency and narrow Efficiency pulse width dimming signals to achieve a very high – Over-Power Protection contrast ratio of 10000:1. The LED current can be set – ±3% Current Accuracy from 50 mA to 250 mA by a single resistor. • Supervisory Functions Device Information(1) – Precision Enable PART NUMBER PACKAGE BODY SIZE (NOM) – COMM I/O Pin for Diagnostic and Commands LM3492HC PWP (20) 6.50 mm × 4.40 mm – Thermal Shutdown Protection LM3492HC-Q1 – Thermally Enhanced PWP, 20-Pin Package (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Application 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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