参数资料
型号: IRS21571DSTRPBF
厂商: International Rectifier
文件页数: 21/28页
文件大小: 0K
描述: IC BALLAST CONTROL 600V 16SOIC
标准包装: 2,500
类型: 镇流器控制器
频率: 43.7 ~ 48.3 kHz
电流 - 电源: 10mA
电流 - 输出: 180mA
电源电压: 11.5 V ~ 15.6 V
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 带卷 (TR)
IRS21571D
+ rectified
AC Line
+ V BUS
VDC
1
16
HO
CPH
VS
R GHS
C BLOCK
L RES
2
15
RPH
VB
C BS
RT
3
14
VCC
D BOOT
R Supply
C SNUBBER
4
13
RUN
5
12
COM
C VCC
D1
CT
6
11
LO
D2
C RES
DT
OC
7
8
10
9
CS
SD
R3
R GLS
R4
C2
R CS
R5
V BUS return
Figure 12: Lamp presence detection circuit
connection (shaded area)
When the SD pin exceeds 2.0V (approximately 150mV of hysterisis 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 pin would be pulled back to near the ground potential. Under these
conditions a reset signal would restart the chip from the beginning of the control sequence, as shown in the timing
diagram in Figure 13.
2
SD
4
CT
8
CPH
15
LO
15
HO-VS
RUN mode
SD mode
Restart
Figure 13: SD pin fault and auto restart
Thus, for a lamp removal and replacement, the ballast automatically restarts the lamp in the proper manner,
maximizing lamp life and minimizing stress on the power MOSFETs or IGBTs.
www.irf.com
21
? 2008 International Rectifier
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