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UBA2071T Datasheet(PDF) 2 Page - NXP Semiconductors |
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UBA2071T Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 35 page UBA2071_A_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 23 June 2008 2 of 35 NXP Semiconductors UBA2071; UBA2071A Half bridge control IC for CCFL backlighting I Bidirectional pin acting both as fault signaling output and input, allowing external fault interfacing to operate via the integrated fault timer. I Brightness level adjustment through PWM dimming. I Integrated PWM generator. I Power-down mode. I Communication pin for master / slave operation. I DC blocking capacitor pre-charging sequence. I Supply clamp (UBA2071 only). 3. Applications I LCD-backlighting, including LCD-TV and LCD-monitor applications. The IC is intended to drive and control a half bridge inverter with resonant load circuit for CCFLs, but can also drive an array of External Electrode Fluorescent Lamps (EEFLs). 4. Quick reference data Table 1. Quick reference data. Tamb =25 °C; VVDD =12V; RIREF =33kΩ;VEN =VVDD and CPWM connected to a capacitor, unless otherwise specified. All voltages are measured with respect to signal ground (SGND, pin 10). SGND and PGND connected together. Currents are positive when flowing into the IC. Symbol Parameter Conditions Min Typ Max Unit VSH voltage on pin SH - - 550 V VVDD voltage on pin VDD - - 14 V IVDD current on pin VDD EN pin grounded; VVDD = 14.0 V; UBA2071AT and UBA2071ATS - - 0.22 mA oscillating at fsw(min); CCF = 100 pF 1.2 1.5 1.8 mA disabled; VVDD =11V - 0.16 - mA oscillating; CF = 100 pF; GL and GH open - 1.5 - mA CCF = 100 pF; VPWMD =H; VCSWP =0V 1.0 1.2 1.4 mA fsw(min) minimum switching frequency CCF = 100 pF [1] [2] 10 - 100 kHz [1] [2] 38 40 42 kHz fsw(max)/fsw(min) maximum switching frequency to minimum switching frequency ratio 2.2 2.4 2.6 kHz Vref(creg) current regulation reference voltage 1.20 1.26 1.32 V |
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