參數(shù)資料
型號(hào): IR21571
廠商: International Rectifier
英文描述: FULLY INTEGRATED BALLAST CONTROL IC
中文描述: 完全集成的鎮(zhèn)流器控制IC
文件頁數(shù): 15/17頁
文件大?。?/td> 234K
代理商: IR21571
IR21571
(S)
www.irf.com
15
Recovery from such a fault condition is accomplished
by cycling either the SD lead or the V
CC
lead. When
a lamp is removed, the SD lead goes high, the fault
latch is reset, and the chip is held off in an unlatched
state. Lamp replacement causes the SD lead to go
low again, reinitiating the startup sequence. The fault
latch can also be reset by the undervoltage lockout
signal, if V
CC
falls below the lower undervoltage
threshold.
Bootstrap Supply Considerations
Power is normally supplied to the high-side circuitry
by means of a simple charge pump from V
CC
, as
shown in Figure 19.
Figure 17: Operation below resonance
Figure 18: Auto restart for lamp replacement
Figure 16: Hard switching condition
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