參數(shù)資料
型號： PM6675ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁數(shù)： 35/50頁
文件大小： 782K
代理商： PM6675ATR
Application information
PM6675
40/47
7.1.6
VDDQ current limit setting
The valley current limit is set by RCSNS and must be chosen to support the maximum load
current. The valley of the inductor current ILvalley is:
Equation 46
The output current limit depends on the current ripple as shown in Figure 20:
Figure 20. Valley current limit waveforms
As the valley threshold is fixed, the greater the current ripple, the greater the DC output
current will be. If an output current limit greater than ILOAD(max) over all the input voltage
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor RCSNS is:
Equation 47
where RDSon is the drain-source on-resistance of the low-side switch. Consider the
temperature effect and the worst case value in RDSon calculation (typically +0.4%/°C).
The accuracy of the valley current also depends on the offset of the internal comparator
(±5mV).
The negative valley-current limit (if the device works in forced-PWM mode) is given by:
Equation 48
2
I
(max)
I
L
LOAD
Lvalley
=
Inductor current
Valley current limit
MAX LOAD 1
MAX LOAD 2
Inductor current
Current
Time
uA
100
I
R
Lvalley
DSon
CSNS
=
DSon
NEG
R
mV
120
I
=
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