UBA2211BT/N1 NXP Semiconductors, UBA2211BT/N1 Datasheet - Page 6
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UBA2211BT/N1
Manufacturer Part Number
UBA2211BT/N1
Description
CFL DRIVER, HALF-BRIDGE, 14SOIC
Manufacturer
NXP Semiconductors
Datasheet
1.UBA2211APN1112.pdf
(19 pages)
Specifications of UBA2211BT/N1
Driver Case Style
SOIC
No. Of Pins
14
Operating Temperature Range
-40°C To +150°C
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UBA2211BT/N1
Manufacturer:
NXP/恩智浦
Quantity:
20 000
NXP Semiconductors
UBA2211
Preliminary data sheet
7.5 Preheat state
The output voltage of the bridge changes with the falling edge of the signal on pin RC. The
nominal half-bridge frequency is shown in
The maximum frequency is 2.5 × f
internal LSPT and HSPT drive signals and the output is shown in
As described in
V
by the sweep current (I
enabled and the half-bridge circuit starts oscillating.
The preheat current is monitored using the external R
frequency using output voltage V
internal reference voltage (V
conduction time. The preheat peak current through the lamp filament is calculated as
shown in
The preheat time is set by the external capacitor (C
down-going C
If during the preheat time, capacitive mode is sensed, the internal V
discharged and the frequency sweep restarts at f
I
ph peak
Fig 4.
DD
f
(
osc nom
is above V
(
)
=
Oscillator, HSPT/LSPT drivers and output signals
Equation
)
HSPT driver
V
----------------- -
R
LSPT driver
=
half-bridge
ref ph
SENSE
SW
------------------------------------------ -
k
DD(start)
(
osc
All information provided in this document is subject to legal disclaimers.
V
Section
V
OUT
voltage equals V
)
RC
×
2:
0
0
0
0
R
osc
1
and OTP is not active. The capacitor on pin SW (C
SW
Rev. 2.1 — 7 March 2011
7.2, the IC enters the preheat state when the voltage on pin
×
). The preheat Operational Transconductance Amplifier (OTA) is
C
ref(ph)
osc
SW(ph)
). The peak voltage is the voltage at the end of the LSPT
SW(ph)
osc(nom)
so that the peak voltage across R
; see
and is set at V
Equation
Half-bridge power IC family for CFL lamps
Figure
max
SW
1:
.
4.
SENSE
). The preheat state ends when the
SW
. An overview of the oscillator,
resistor. The OTA controls the
Figure
SW
UBA2211
001aam035
HIGH node is
© NXP B.V. 2011. All rights reserved.
SENSE
4.
time (s)
time (s)
time (s)
time (s)
SW
) is charged
equals the
6 of 19
(1)
(2)