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參數(shù)資料
| 型號(hào)： | 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)： | 14/24頁 |
| 文件大?。?/td> | 332K |
| 代理商： | IRU3072C |
14
Rev. 1.0
3/25/04
IRU3072
www.irf.com
Figure 20 - Operation waveforms when output
of buck converter is short to ground.
The output UVLO senses the four feedback pin voltages
Fb1,Fb2,Fb3,Fb4. If any of the feedback voltages are
below 0.4V, all four outputs will be shutdown.
Figure 21 - Operation of PWM output and LDO
when PWM output is short to ground.
Figure 19 - Profile of switching frequency versus
output current -predicted and measured.
Figure 18 (a) shows normal operation waveforms for a
12V input 1.6V output 400KHz buck regulator. During
normal operation, the switching frequency is 400KHz.
Figure 18 (b) shows the operation waveforms during cur-
rent limit mode. The switching frequency is reduced and
output ripple increases. Figure 19 shows the profile of
switching frequency versus output current. When the
output current goes up and hit the over current limit, the
switching frequency starts to decreases. Due to the out-
put voltage loop, the output voltage will keep the regula-
tion except the ripple increases. As the output current
keeps going up. The output voltage will start to decrease
until the feedback voltage Fb is under 0.4V. The output
voltage under lockout takes over and turns off both high
side and low side MOSFET. The output voltage reduces
to zero.
Output Feedback UVLO
Besides the cycle-by-cycle current limit, an output feed-
back UVLO is included in the IRU3072 for the output
short protection. The diagram is shown in Figure 14. If
the output is short or overload, once the voltage at the
Fb1 pin is below 0.4V, the output feedback UVLO com-
parator will flip and turn off both high side and low side
MOSFETs. The output of converter will decrease to zero.
The operation when PWM output is in short circuit con-
dition is shown in Figure 20. If either PWM or LDO out-
put is in short condition, it will turn off all outputs. The
operation waveforms are shown in Figures 21 and 22.
Figure 23 shows a soft-start operation when the output
is short. Because of current limit and output feedback
UVLO, the output will be turned off and the system pro-
tected.
0
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0
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Iout (A)
F
Fs(measured)
Fs(predicted)
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|---|---|
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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 |
| IRU3073CQTR | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數(shù):3 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
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