參數(shù)資料
型號： 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)： 13/17頁
文件大?。?/td> 234K
代理商： IR21571
IR21571
(S)
www.irf.com
13
Figure 11: VDC lead fault and auto restart
Lamp Presence Detection and
Automatic Restart
The second protection lead, SD, is used for both
unlatched shutdown and automatic restart functions.
The SD lead would normally be connected to an
external circuit which senses the presence of the
lamp (or lamps), as shown in Figure 12.
When the SD lead exceeds 2.0V (approximately
150mV of hysteresis is included to increase noise
immunity), signaling either a lamp fault or lamp
removal, the oscillator is disabled, both gate driver
outputs are pulled low, and the chip is put into the
micropower mode. Since a lamp fault would normally
lead to a lamp exchange, when a new lamp is
inserted into the fixture, the SD lead would be pulled
back to near the ground potential. Under these
Figure 12: Lamp presence detection circuit
connection (shaded area)
conditions a reset signal would restart the chip from
the beginning of the control sequence, as shown in
the timing diagram in Figure 13.
Figure 13: SD lead fault and auto restart
RUN mode
Low VDC
CT
4
VDC
3
5
CPH
8
LO
15
HO-VS
15
Restart
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
VDC
CPH
RPH
RT
RUN
CT
DT
OC
LO
COM
VCC
VB
VS
HO
SD
CS
+ V
BUS
+ rectified
AC Line
V
BUS
return
C
BS
D
BOOT
R
Supply
C
VCC
R
CS
L
RES
C
RES
R
GHS
R
GLS
C
BLOCK
C
SNUBBER
R4
R3
R5
C2
D1
D2
RUN mode
SD mode
CT
4
CPH
8
LO
15
HO-VS
15
Restart
SD
2
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