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UBA2014 데이터시트 PDF




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부품번호 UBA2014 기능
기능 600 V driver IC for HF fluorescent lamps
제조업체 NXP Semiconductors
로고 NXP Semiconductors 로고


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UBA2014 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
UBA2014
600 V driver IC for HF fluorescent
lamps
Product specification
2002 May 16




UBA2014 pdf, 반도체, 판매, 대치품
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GND
5
1
CT
VDD
7
Vref
14
3V
SUPPLY
reference
voltages
digital
supply (5 V)
analog
VDD(L)
PREHEAT TIMER
reset
LOGIC
Vpd BOOTSTRAP
UBA2014
DRIVER
LOGIC
STATE LOGIC
reset state
start-up state
preheat state
ignition state
burn state
hold state
power-down state
LEVEL
SHIFTER
HS
DRIVER
LS
DRIVER
9 FVDD
10
GH
11
SH
6
GL
ANT/ CMD
12
ACM
PCS
8
PCS
VOLTAGE
CONTROLLED
OSCILLATOR
REFERENCE
CURRENT
I
V
4
IREF
3
CF
LAMP
VOLTAGE
SENSOR
Vlamp(fail) Vlamp(max)
13
LVS
Fig.1 Block diagram.
LOGIC
FREQUENCY
CONTROL
AVERAGE
CURRENT
SENSOR
2
CSW
15 CS+
16 CS
MGW579

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UBA2014 전자부품, 판매, 대치품
Philips Semiconductors
600 V driver IC for HF fluorescent lamps
Product specification
UBA2014
Lamp failure mode
DURING IGNITION STATE
If the lamp does not ignite, the voltage level increases.
When the lamp voltage exceeds the Vlamp(max) level, the
voltage will be regulated at the Vlamp(max) level; see Fig.6.
At crossing the Vlamp(fail) level the ignition timer was
already started. If the voltage at pin LVS is above the
Vlamp(fail) level at the end of the ignition time the circuit
stops oscillating and is forced in a Power-down mode. The
circuit will be reset only when the supply voltage is
powered-down.
DURING BURN STATE
If the lamp fails during normal operation, the voltage
across the lamp will increase and the lamp voltage will
exceed the Vlamp(fail) level; see Fig.7. At that moment the
ignition timer is started. If the lamp voltage increases
further it will reach the Vlamp(max) level. This forces the
circuit to re-enter the ignition state and results in an
attempt to re-ignite the lamp. If during restart the lamp still
fails, the voltage remains high until the end of the ignition
time. At the end of the ignition time the circuit stops
oscillating and the circuit will enter in the Power-down
mode.
Power-down state
The Power-down state will be entered if, at the end of the
ignition time, the voltage at pin LVS is above Vlamp(fail).
In the Power-down mode the oscillator will be stopped and
both TR1 and TR2 will be non-conductive. The VDD supply
is internally clamped. The circuit is released from the
Power-down state by lowering the low voltage supply
below VDD(reset).
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 the pins IREF and
CF are sensitive to this charge injection. For charge
coupling of ±8 pC, 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 VCS, VPCS and VACM
levels.
Charge coupling at current levels below 20 µA will not
interfere with the accuracy of any parameter.
Design equations
The following design equations are used to calculate the
desired preheat time, the maximum ignition time, and the
minimum and the maximum switching frequency.
tph = 1.7 × 104 × CCT × RIREF (s)
tign = 3.1 × 105 × CCT × RIREF (s)
fmin = (---C----1-C--2-F--5--×---×--R---1--I-0R----3E---F----) in kHz
fmax = 2.5 × fmin (kHz)
with CCT in nF, RIREF in k, and CCF in pF. Start of ignition
is defined as the moment at which the measured lamp
voltage crosses the Vlamp(fail) level; see Section “Lamp
failure mode”.
Capacitive mode protection
The signal across R16 also gives information about the
switching behaviour of the half bridge.
If, after the preheat state, the voltage across the ACM
resistor (R16) does not exceed the VCMD level during the
non-overlap time, the Capacitive Mode Detection circuit
(CMD) assumes that the circuit is in the capacitive mode
of operation. As a consequence the frequency will directly
be increased to fmax. The frequency behaviour is
decoupled from the voltage at pin CSW until CCSW has
been discharged to zero.
2002 May 16
7

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