IR21592 데이터 시트보기 (PDF) - International Rectifier
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IR21592 Datasheet PDF : 26 Pages
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IR21592/IR21593(S) &(PbF)
VCS
Switching
Noise
LO
ϑBLANK
Dimming
Range
Should the peak voltage on pin CS exceed 1.6V
at any time during dimming, the IR21592/IR21593
enters FAULT mode and the high and low-side
driver outputs, HO and LO, are both turned off.
Cycling the supply voltage on VCC below UVLO-
t
or the voltage on pin SD above and below SD+
and SD- will reset the IR21592/IR21593 to preheat
(PH) mode (see STATE DIAGRAM).
Ballast Design
Lamp Requirements
Figure 16, 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 17), 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.
LOAD
REMOVAL
HO
LO
VS
t
VCS
1.6V
Before selecting component values for the ballast
output stage and the programmable inputs of
the IR21592/IR21593, the following lamp
requirements must first be defined:
Variable
I ph
t ph
V phmax
Vign
P100%
V100%
P1%
V1%
I Cathmin
Description
Filament pre-heat current
Filament pre-heat time
Maximum lamp pre-heat voltage
Lamp ignition voltage
Lamp power at 100% brightness
Lamp voltage at 100% brightness
Lamp power at 1% brightness
Lamp voltage at 1% brightness
Minimum cathode heating current
Units
Arms
s
Vpp
Vpp
W
Vpp
W
Vpp
Arms
NORMAL
OPERATION
HARD
SWITCHING
t
FAULT
Figure 17, hard-switching with latch off
www.irf.com
Table I, Typical lamp requirements
21
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