IR21593 International Rectifier, IR21593 Datasheet - Page 21

• Manufacturer Part Number: IR21593
• Description: IC CTRLR BALLAST DIMMING 16-DIP
• Manufacturer: International Rectifier
• Type: Ballast Controllerr

Specifications of IR21593

• Frequency: 30 ~ 230 kHz
• Current - Supply: 10mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Other names: *IR21593

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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.
1.6V
HO
LO
VS
V
CS
V
LO
BLANK
CS
Figure 17, hard-switching with latch off
Figure 16, Current sense timing diagram.
OPERATION
NORMAL
Switching
Noise
Dimming
Range
REMOVAL
LOAD
SWITCHING
HARD
FAULT
t
t
t
IR21592/IR21593
Lamp Requirements
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:
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-
or the voltage on pin SD above and below SD+
and SD- will reset the IR21592/IR21593 to preheat
(PH) mode (see STATE DIAGRAM).
Variable
V
I
V
Cath
P
V
V
I
ph
P
t
100
100
1
ign
1
ph
ph
max
%
%
min
%
%
Table I, Typical lamp requirements
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
Ballast Design
Description
( S ) & ( PbF )
Units
Arms
Arms
Vpp
Vpp
Vpp
Vpp
W
W
s
21