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| 型號： | SC483ITSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller |
| 中文描述： | 雙同步降壓偽固定頻率電源控制器 |
| 文件頁數(shù)： | 4/27頁 |
| 文件大?。?/td> | 478K |
| 代理商： | SC483ITSTRT |
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4
2005 Semtech Corp.
www.semtech.com
SC483
POWER MANAGEMENT
Electrical Characteristics (Cont.)
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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 6.
(5) Semtech’s SmartDriver
TM
FET drive first pulls DH high with a pullup resistance of 10
(typ.) until LX = 1.5V (typ.).
At this point, an additional pullup device is activated, reducing the resistance to 2
(typ.). This negates the need for
an external gate or boost resistor.
Test Conditions: V
BAT
= 15V, EN/PSV1=EN/PSV2 = 5V, VCCA1 = VDDP1 = VCCA2 = VDDP2 = 5V, V
OUT1
= V
OUT2
=1.25V, R
TON1
= R
TON2
= 1M
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