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参数资料
| 型号： | AP2010S |
| 厂商： | INTEGRATED CIRCUIT TECHNOLOGY CORP |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | SINE, 0.1 MHz, WAVEFORM GENERATION, PDSO20 |
| 封装： | LEAD FREE, SOP-20 |
| 文件页数： | 6/9页 |
| 文件大小： | 246K |
| 代理商： | AP2010S |
AP2010
Sine-wave Generator for CCFL Supply
Anachip Corp.
www.anachip.com.tw
Rev.1.0 Oct. 28, 2005
6/9
Function Description
General
Although the IC may operate from VCC=4.5V up to
VCC=20V it is recommended not to use this wide
range in one application. Circuit design and circuit
safety will be much higher if the nominal VCC is kept
within low tolerances. At VCC=5V a possible
deviation of less than 10% is mandatory, while at
higher
supplies
there
is
more
headroom.
Nevertheless it is recommended not to exceed a
supply tolerance of 10%.
Self Trigger Sin Oscillator
The transformer TX1 stepping up the voltage
applied to the CCFL is not driven directly by a 50%
square-wave voltage of sufficient amplitude as in
conventional circuits. Instead of there is a tuned
circuit connected between the output transistors
and the transformer. This has two advantages:
-The voltage applied to the lamp has only little
harmonics
-The pulses driving the circuit need not to be a 50%
square-wave
The latter offers the opportunity to omit the
amplitude control of the pulses driving the circuit
and use instead of a pulse width modulation to
control the energy pumped into the circuit To
secure a save start up of the circuit an oscillator is
used which center frequency should be identical to
that of the tuned circuit. To cope with the tolerances
of the external components mainly L1and C1 this
oscillator is controlled by a PLL which takes care
that the phase of the pulses driving the tuned circuit
are always correct in time. The center-frequency of
the PLL is set by RT and CT1:
fPLL=
CT1
RT
4
7
×
Because RT sets several internal currents its value
should stay around 100K.
Lamp Current Control Loop
The lamp current is sensed at RSENSE and feed via
CI and RI1 into the current rectifier. This is a
full-wave rectifier converting the AC input current at
terminal 13 (FBI) into a DC current at terminal 14
(DC). Using a full-wave rectifier eases the loop filter
design of the current control loop because the AC
component at the filter input has twice the
frequency as it would have with a half-wave rectifier.
Due to this construction and because the reference
voltage at the control amplifier AMP is 1.18V the
actual effective lamp current is:
Ieff = 1.18V．
RI2'
R
RI1
1.1
SENSE ×
×
Dim Circuit
For adjusting the lamp current in a wider range a
dim circuit is used. The triangle of the DIM oscillator
is sliced by the comparator COMP at the DC level
applied to terminal 17 (DIM). Whenever the
oscillator triangle is lower than the DC applied to
terminal 17 a large current is added to the AMP
input. This indicates to the current control loop that
a large lamp current is already present and thus
cutting off the PWM modulator. The frequency of
the DIM oscillator is set by RT and CT2:
fDIM =
CT2
RT
2
×
Because RT sets several internal currents its value
should stay around 100K. Be aware that with the
DIM Circuit in action also the PGOOD will switch ON
and OFF.
Under - Voltage Lockout
To guarantee that at start of operation all
parameters of the circuit are within their target
values, the under voltage lockout releases the drive
of the external MOS transistors only if VCC is above
4.5V. If VCC falls thereafter below 4.4V the drive of
the external MOS transistors is inhibited again. If
the drive is inhibited the external NMOS is switched
ON (as far as this is possible) while the external
PMOS is switched OFF.
Over -Voltage Protection
The indication of an over-voltage is that the peak
voltage at terminal 6 (OVP) is above 3V. If this is
detected the drive of the output is inhibited and
Hiccup Mode is entered. The average DC voltage at
terminal 6 (OVP) is set internally to 1.5V so an AC
peak voltage of 1.5V will trigger the circuit. Any
voltage supplied to this terminal must come in via a
capacitor.
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