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IR2159 Datasheet(PDF) 17 Page - International Rectifier

Part No. IR2159
Description  DIMMING BALLAST CONTROL IC
Download  25 Pages
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IR2159 Datasheet(HTML) 17 Page - International Rectifier

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IR2159/IR21591 (S)
www.irf.com
17
Brown-out Protection
In addition to the voltage on VCC being above
the start-up threshold, pin VDC must also be
above 5.1V for HO and LO to begin oscillating. A
voltage divider (R3,RVDC) from the rectified AC
line connected to pin VDC measures the rectified
AC line input voltage to the ballast and programs
the turn-on and turn-off line voltages. A filter
capacitor (CVDC) is also connected to pin VDC
that must be chosen such that the ripple is low
enough and the lower turn-off threshold of 3V is
not crossed during normal line conditions. This
detection is necessary due to the possibility of
the lamp extinguishing during low-line conditions
before the IC is properly reset. Should a brown-
out occur, the DC bus can drop to a level below
the minimum required for the tank circuit to
maintain the necessary lamp voltage. This
detection will insure a clean turn-off before the
DC bus drops too low and properly resets the
IC to the preheat mode when the line returns.
Preheat (PH)
The IR2159 enters preheat mode when VCC
exceeds the UVLO+ threshold and VDC exceeds
5.1V. HO and LO begin to oscillate at the
maximum operating frequency with 50% duty
cycle and at the internally set dead-time of 2us.
Pin CPH is disconnected from COM and an
internal 1uA current source (Figure 7) charges
the external timing capacitor on CPH linearly.
3
7.6V
2
1uA
7
8
CPH
FMIN
IPH
VCO
11
12
COM
LO
10
CS
1uA
60uA
I
FMIN
1/R
FMIN
5.1V
Q2
RCS
VCO
PH
LOGIC
16
HO
Q2
15
VS
R
FMIN
R
IPH
C
CPH
C
VCO
Half
Bridge
Output
I
LOAD
V
BUS(+)
V
BUS(-)
Load
Return
Half
Bridge
Driver
IR2159
Figure 7, IR2159 preheat circuitry.
An internal 1uA current source slowly discharges
the external capacitor on pin VCO and the voltage
on pin VCO begins to decrease. This decreases
the frequency, which, for operating frequencies
above resonance, increases the load current.
When the peak voltage measured on pin CS,
produced by a portion of the load current flowing
through an external sense resistor (RCS), exceeds
the voltage level on pin IPH, a 60uA internal
current source is connected to pin VCO and the
capacitor charges (Figure 8). This forces the
frequency to increase and the load current to
decrease. When the voltage on pin CS decreases
below IPH, the 60uA current source is
disconnected and the frequency decreases again.


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