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UBA2071ATS Datasheet(PDF) 5 Page - NXP Semiconductors |
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UBA2071ATS Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 35 page  UBA2071_A_1 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 01 — 23 June 2008 5 of 35 NXP Semiconductors UBA2071; UBA2071A Half bridge control IC for CCFL backlighting 7. Pinning information 7.1 Pinning 7.2 Pin description Fig 2. Pin assignment SO24 and SSOP24 package (top view) UBA2071 IFB GH CIFB FS VFB SH CVFB n.c. CSWP n.c. CT n.c. CF GL IREF PGND CPWM VDD SGND EN COMM PWMA NONFAULT PWMD 014aaa099 1 2 3 4 5 6 7 8 9 10 11 12 14 13 16 15 18 17 20 19 22 21 24 23 Table 3. Pin description Symbol Pin Description Function IFB 1 current feedback input. Input signal for the lamp current control loop. Should be connected to a voltage proportional to the lamp current. CIFB 2 current regulation capacitor. A capacitor must be connected between this pin and the signal ground. It sets the time constant of the lamp current control loop. VFB 3 voltage feedback input Input signal for the voltage control loop. Should be connected to a voltage proportional to the transformer output voltage. CVFB 4 voltage regulation capacitor A capacitor must be connected between this pin and the signal ground. It sets the time constant of the voltage control loop. CSWP 5 frequency sweep capacitor A capacitor must be connected between this pin and the signal ground. It sets the time in which the HF frequency is swept up from regulation level to the maximum frequency and back during PWM dimming. CT 6 fault timing capacitor A capacitor must be connected between this pin and the signal ground. It sets the time that a fault condition is allowed before the IC shuts down itself. CF 7 HF-oscillator timing capacitor A capacitor must be connected between this pin and the signal ground. It sets the minimum switching frequency of the half bridge. IREF 8 reference current output A 33 k Ω resistor must be connected between this pin and the signal ground. The IC uses it to make accurate internal currents. CPWM 9 PWM timing capacitor If a capacitor is connected between this pin and the signal ground, it sets the frequency of the PWM oscillator. If this pin is connected to signal ground the internal PWM oscillator is disabled. SGND 10 signal ground COMM 11 master / slave communication Via this pin the IC can communicate with a dedicated slave device. |
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