參數(shù)資料
型號： IRU3072C
廠商： International Rectifier
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
中文描述： 20引腳同步PWM控制器/ 3 LDO控制器
文件頁數(shù)： 10/24頁
文件大?。?/td> 332K
代理商： IRU3072C
10
Rev. 1.0
3/25/04
IRU3072
www.irf.com
(a). Shutdown and start up PWM output by controlling
soft start SS1. LDO output such as Vout2 will not be
affected.
(b). Shutdown and start up LDO output by controlling
soft-start SSLDO. PWM output V
OUT1
will not be affected.
Figure 10 - Shutdown PWM or LDO by
controlling soft-start.
One issue related to shutdown of PWM output by pull-
ing down the soft-start, there is a small negative voltage
shown in the output during the shutdown. It is because
the low side MOSFET driver is on when the soft-start
capacitor voltage is pulling down. The output inductor
resonates with output capacitor and load. This occurs
especially often when output current is small (light load
or no load condition). The operation waveforms are shown
as follows.
Figure 11 - Operation waveforms when PWM
converter is shutdown by pulling
down the soft-start capacitor.
Both PWM output and LDO output can be shutdown by
pulling the pin V
SEN33
/SDB down. One example is shown
as follows.
Figure 12 - External shutdown by
using pin V
SEN33
/SDB.
IRU3072
U1
Vcc
Vc
HDrv
LDrv
V
OUT1
OCSet
V
SEN33
/ SDB
C6
C10
L1
Q4
Q5
R7
VccLDO
V
BUS
=5V
UVLO
3.3V
Drv2
Fb2
Soft-Start
SS1
SS
LDO
L2
4.7K
External
Shutdown
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參數(shù)描述
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IRU3073 制造商:IRF 制造商全稱:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER
IRU3073CQ 制造商:IRF 制造商全稱:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER
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