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IR2159 Datasheet(PDF) 21 Page - International Rectifier

Part No. IR2159
Description  DIMMING BALLAST CONTROL IC
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IR2159 Datasheet(HTML) 21 Page - International Rectifier

 
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IR2159/IR21591 (S)
www.irf.com
21
detection comparator for 400ns after LO goes 'high'
(Figure 15).
11
12
COM
LO
10
CS
1.6V
Q2
RCS
16
HO
Q2
15
VS
Half
Bridge
Output
I
LOAD
V
BUS (+)
V
BUS (-)
Load
Return
Half
Bridge
Driver
IR2159
PHASE
CONTROL
FAULT
LOGIC
400ns
BLANK
R1
Figure 14, Current sensing circuitry.
The internal blank time reduces the dimming range
slightly (Figure 15) when operating at minimum
phase shift (maximum lamp power). The external
programming resistor on pin MAX must be
selected such that the minimum phase shift is
set a safe margin away from the blank time. A
series resistor (R1) is required to limit the amount
of current flowing out of pin CS when the voltage
across RCS goes below -0.7V. A filter capacitor
at pin CS may be required due to other possible
asynchronous noise sources present in the ballast
system.
J
BLANK
V
CS
t
LO
Switching
Noise
Dimming
Range
Figure 15, Current sense timing diagram.
Fault Mode (FAULT)
During dimming, the peak current regulation circuit
active during preheat and ignition is disabled.
Should non-zero voltage switching at the output
of the half-bridge occur (Figure 18), high current
spikes will result. A lamp filament failure, lamp
end-of-life, lamp removal, or a deadtime shorter
than what is required for commutation, can all
cause hard-switching.
t
t
VS
HO
LO
VCS
1.6V
NORMAL
OPERATION
HARD
SWITCHING
FAULT
LOAD
REMOVAL
Figure 18, hard-switching with latch off


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