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UCC2974PW Datasheet(PDF) 6 Page - Texas Instruments |
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UCC2974PW Datasheet(HTML) 6 Page - Texas Instruments |
6 / 14 page UCC2974 UCC3974 SLUS485A – JULY 2001 – REVISED NOVEMBER 2001 6 www.ti.com APPLICATION INFORMATION functional block diagram UDG–01021 3 + + + VIN OPEN LAMP DETECTOR ZERO DETECTOR VOLTAGE CLAMP OSCILLATOR 4–BIT COUNTER AND LOGIC SYNC VDRV 1 S Q QR R DOMINANT LFD–PWM UVLO OPEN LAMP OE VINT 5 + + EA1 UVLO SQ Q R SD OPEN LAMP OVERFLOW INTERNAL REGULATOR VREG UVLO 1.5 1.0 VIN 13 2 VIN CBP BUCK1 OUT1 FB1 SAME AS OTHER CHANNEL MODE SELECT 10 MODE 5 µA VINT 14 BUCK2 16 OUT2 11 FB2 + + 1.5 LFD OSCILLATOR & LOGIC LFD–PWM 4 COMP1 PRE–CON 6 RT1 7 RT2 9 DIM 8 LFDSYNC 1.0 LFD SECTION 12 COMP2 40 kHz TO 200 kHZ LFD–EN general description The UCC3974 extends the capabilities of the UCC3972 and UCC3973 backlight controllers. The basic functionality is the same as that for the UCC3972; a buck controlled current source feeding a royer oscillator CCFL circuit. As such the application information for the UCC3972 that pertains to the royer oscillator, buck controller and CCFL circuit in general apply to the UCC3974. Also, this device implements a voltage clamping scheme, similar to that of the UCC3973, using an internal current source to bias up the FB pin and thereby limiting the current available to the royer stage. This limits the voltage to which the secondary side of the transformer is exposed. The extensions this device provides are two separately controlled channels to be used with two separate royer stages, and integrated low-frequency dimming (LFD) control . |
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