參數(shù)資料
型號(hào)： SC411
廠商： Semtech Corporation
英文描述： Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
中文描述： 同步降壓偽固定頻率電源控制器
文件頁(yè)數(shù)： 5/27頁(yè)
文件大?。?/td> 488K
代理商： SC411
5
2007 Semtech Corp.
www.semtech.com
SC411
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Notes:
1) When the inductor is in continuous and discontinuous conduction mode, the output voltage will have a DC regulation level higher than the
error-comparator threshold by 50% of the ripple voltage.
2) Using a current sense resistor, this measurement relates to PGND minus the voltage of the source on the low-side MOSFET. These values
guaranteed by the ILIM Source Current and Current Comparator Offset tests.
3) clks = Switching cycles.
4) Guaranteed by design. See Shoot-Through Delay Timing Diagram on Page 8.
5) Semtech’s SmartDriver
TM
FET drive
fi
rst pulls DH high with a pull-up resistance of 10
Ω
(typ) until LX = 1.5V (typ). At this point, an additional
pull-up device is activated, reducing the resistance to 2
Ω
(typ). This negates the need for an external gate or boost resistor.
Parameter
Conditions
25°C
-40°C to 125°C
Units
Min
Typ
Max
Min
Max
Soft-Start
Soft-Start Ramp Time
EN/PSV High to PGD High
440
clks
(3)
Under-Voltage Blank Time
EN/PSV High to UV High
440
clks
(3)
Gate Drivers
Shoot-Through Delay
(4)
DH or DL Rising
30
ns
DL Pull-Down Resistance
DL Low
0.80
1.75
Ω
DL Sink Current
DL = 2.5V
3.1
A
DL Pull-Up Resistance
DL High
2
4
Ω
DL Source Current
DL = 2.5V
1.3
A
相關(guān)PDF資料
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SC411EVB Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
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