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參數資料
| 型號： | IRU3073CQTR |
| 廠商： | International Rectifier |
| 文件頁數： | 7/21頁 |
| 文件大?。?/td> | 236K |
| 描述： | IC REG DL BCK/LINEAR 16-QSOP |
| 標準包裝： | 1 |
| 拓撲： | 降壓（降壓）同步（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數： | 2 |
| 頻率 - 開關： | 210kHz ~ 400kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 0.8 V ~ 22.5 V，65mA |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 是 |
| 電源電壓： | 4.4 V ~ 25 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | * |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | *IRU3073CQTR IRU3073CQCT |
IRU3073
7
Rev. 1.0
09/17/03
www.irf.com
If the over-current condition is temporary and goes away
quickly, the IRU3073 will resume its normal operation.
If output is shorted or over-current condition persists,
the output voltage will keep going down until it is below
0.4V. Then the output under-voltage lock out comparator
goes high and turns off both MOSFETs. The operation
waveforms are shown in Figure 6.
Figure 6 - Diagram of over-current operation.
Feedback
voltage
Switching
frequency
High Side MOSFET
turn on time (tON)
Average Inductor
Current
IOUT
IOUT
IOUT
IOUT
DMAX/FS(NOM)
FS(NOM)
0.4V
VREF
<IL>=IOUT
Normal
operation
Over Current
Limit Mode
Shutdown
by UVLO
IO(LIM)
IO(MAX)
VOUT
FS(NOM)3VIN
Operation in current limit is shown in Figure 7, the high
side MOSFET is turned off and inductor current starts to
decrease. Because the output inductor current is higher
than the current limit setpoint (ISET), the over-current com-
parator keeps high until the inductor current decreases
to be below ISET. Then another cycle starts.
During over-current mode, the valley inductor current is:
The peak inductor current is given as:
To avoid undesirable trigger of over-current protection,
this relationship must be satisfied:
iL(VALLEY) = ISET
IL(PEAK) = ISET+(VIN-VOUT)3tON/L ---(3)
ISET=iL(VALLEY)
iL(PEAK)
tON
tOFF
iL(AVG)
Current Limit
Comparator Output
Inductor
Current
HDrv
ISET / IO(NOM) -
DIPK-PK(NOM)
2
ISET = IO(LIM) - ---(5)
(VIN-VOUT)3VOUT
23fS3L3VIN
( )
(VIN - VOUT)3VOUT
VIN3L3fS
DIPK-PK(LIM) =
IO(LIM) = ISET + ---(4)
DIPK-PK(LIM)
2
RSET = 3 IO(LIM) - ---(6)
RDS(ON)
IOCSET
[ ( )]
(VIN-VOUT)3VOUT
23fS3L3VIN
Figure 7 - Operation waveforms during current limit.
From Figure 7, the average inductor current during the
current limit mode is:
The inductor's ripple current can be expressed as:
Combination of above equation and (4) results in:
Combination of equations (5) and (2) results in the rela-
tionship between RSET and output current limit:
From the above analysis, the current limit is not only
dependent on the current setting resistor RSET and RDS(ON)
of low side MOSFET but it is also dependent on the
input voltage, output voltage, inductance and switching
frequency as well.
The cycle-by-cycle over-current limit will hold for a cer-
tain amount of time, until the output voltage drops below
0.4V, the under-voltage lock out activates and latches
off the output driver. The operation waveform is shown in
Figure 4. Normal operation will resume after IRU3073 is
powered up again.
Where:
IO(LIM) = The Output Current Limit -typical is 50%
higher than nominal output current.
VIN = Maximum Input Voltage
VOUT = Output Voltage
fS = Switching Frequency
L = Output Inductor
RDS(ON) = RDS(ON) of Low Side MOSFET
IOCSET = OC Threshold Set Current
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