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參數(shù)資料
| 型號： | IR2159S |
| 廠商： | International Rectifier |
| 英文描述： | DIMMING BALLAST CONTROL IC |
| 中文描述： | 調(diào)光鎮(zhèn)流器控制IC |
| 文件頁數(shù)： | 21/25頁 |
| 文件大?。?/td> | 267K |
| 代理商： | IR2159S |
IR21592/IR21593
(S)
www.irf.com
21
BLANK
V
CS
t
LO
Switching
Noise
Dimming
Range
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.
t
t
VS
HO
LO
V
CS
1.6V
NORMAL
OPERATION
HARD
SWITCHING
FAULT
LOAD
REMOVAL
Figure 17, hard-switching with latch off
Figure 16, Current sense timing diagram.
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).
Ballast Design
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:
Variable
I
Description
Units
ph
Filament pre-heat current
Arms
ph
t
Filament pre-heat time
s
max
ph
V
V
Maximum lamp pre-heat voltage
Vpp
ign
Lamp ignition voltage
Vpp
%
100
P
V
Lamp power at 100% brightness
W
%
100
Lamp voltage at 100% brightness
Vpp
%
1
P
1
V
Lamp power at 1% brightness
W
%
Lamp voltage at 1% brightness
Vpp
min
Cath
I
Minimum cathode heating current
Arms
Table I, Typical lamp requirements
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