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UBA2021T View Datasheet(PDF) - NXP Semiconductors.

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Description
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UBA2021T
NXP
NXP Semiconductors. NXP
UBA2021T Datasheet PDF : 16 Pages
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NXP Semiconductors
UBA2021
630 V driver IC for CFL and TL lamps
7.12 Frequency and change in frequency
At any point in time during oscillation, the circuit will operate between fB 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 the CI-pin show a rather constant f/t over
the entire frequency range. The following rates are realized (at a frequency of 85 kHz and
with a 100 nF capacitor connected to the PCI-pin):
For any increase in frequency: f/t is between 15 kHz/ms and 37.5 kHz/ms.
During preheat and normal operation: f/t for a decrease in frequency is between
6 kHz/ms and 15 kHz/ms.
During the ignition phase: f/t for a decrease in frequency is between
150 Hz/ms and 375 Hz/ms.
7.13 Ground pins
The PGND-pin is the ground reference of the IC with respect to the application. As an
exception the SGND-pin provides a local ground reference for the components connected
to the CP-pin, CI-pin, RREF-pin and thee CF-pin. For this purpose the PGND-pin and
SGND-pin are short circuited internally. External connection of the PGND-pin and the
SGND-pin is not preferred. The sum of currents flowing out of the CP-pin, CI-pin,
RREF-pin, CF-pin and the SGND-pin must remain zero at all time.
7.14 Charge coupling
Due to parasitic capacitive coupling to the high voltage circuitry, all pins are burdened with
a repetitive charge injection. Given the typical application in Figure 7, the RREF-pin and
the CF-pin are sensitive to this charge injection. For the rating Qcouple a safe functional
operation of the IC is guaranteed, independent of the current level. Charge coupling at
current levels below 50 mA will not interfere with the accuracy of the VRS(cap) and VRS(ctrl)
levels. Charge coupling at current levels below 20 mA will not interfere with the accuracy
of any parameter.
8. Limiting values
UBA2021_4
Product data sheet
Table 5. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages referenced to
ground.
Symbol Parameter
Conditions
Min
Max
Unit
VFS
high side floating supply operating
voltage
t 0.5 s
-
570
V
-
630
V
IVS(clamp)
VRS
clamp current
input voltage pin RS
transient of 50 ns
-
35
mA
2.5
+2.5
V
15
+2.5
V
SR
slew rate at pins S1, G1
and FS (with respect to
ground)
4
+4
V/ns
P
power dissipation
-
500
mW
Tamb
Tj
ambient temperature
junction temperature
40
+150
°C
40
+150
°C
Rev. 04 — 25 July 2008
© NXP B.V. 2008. All rights reserved.
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