UBA2025T データシートの表示（PDF） - NXP Semiconductors.

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UBA2025T

CFL power IC

NXP Semiconductors. 

NXP Semiconductors

UBA2025

CFL power IC

Table 3. Minimum gate voltages

Frequency

< 75 kHz

75 kHz to 80 kHz

> 85 kHz

Voltage

8 V (min.)

7 V (min.)

6 V (min.)

The drive voltage at gate of T2 (G2) will exceed the drive voltage of the high side driver.

7.12 Frequency and change in frequency

At any point in time during oscillation, the circuit will operate between fbtm and fstart. Any

change in frequency will be gradual, no steps in frequency will occur. Changes in

frequency caused by a change in voltage at pin CI, show a rather constant df/dt over the

entire frequency range. The following rates are realised (at a frequency of 85 kHz and a

100 nF connected to pin CI):

• For any increase in frequency the df/dt will be between 15 kHz/ms and 37.5 kHz/ms

• During preheat and normal operation: the df/dt for a decrease in frequency is between

−6 kHz/ms and −15 kHz/ms

• During the ignition phase: the df/dt for a decrease in frequency is between

−150 Hz/msand −375 Hz/ms.

7.13 Ground pins

Pin PGND and pin GND are the ground references of the IC with respect to the

application. Pin SGND provides a local ground reference for the components connected

to pins CPAV, CI, IREF and CF. Other external connections to pin SGND are not preferred.

The sum of currents flowing out of the pins CPAV, CI, IREF, CF and SGND must remain

zero at any time. Pin GND is internally connected to SGND.

7.14 Charge coupling

Due to parasitic capacitive coupling to the high voltage circuitry, all pins are exposed to a

repetitive charge injection. Given the typical application in figure 6, the pins IREF and CF

are sensitive to this charge injection. For the rating Qcoup a safe functional operation of the

IC is guaranteed, independent of the current level. Charge coupling at current levels below

50 µA will not interfere with the accuracy of the Vth(capm) and Vshunt levels. Charge coupling

at current levels below 20 µA will not interfere with the accuracy of any parameter.

UBA2025_1

Product data sheet

Rev. 01 — 16 October 2009

© NXP B.V. 2009. All rights reserved.

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