參數(shù)資料
型號(hào): L5989D
廠商: STMICROELECTRONICS
元件分類(lèi): 穩(wěn)壓器
英文描述: 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: ROHS COMPLIANT, HTSSOP-16
文件頁(yè)數(shù): 29/51頁(yè)
文件大?。?/td> 1947K
代理商: L5989D
L5989D
Application information
Doc ID 15778 Rev 3
35/51
6.5
R.M.S. current of the embedded power MOSFETs
The L5989D integrates both the power elements (high side and low side) and so the power
dissipation is often the bottleneck for the output current capability (refer to Chapter 6.6 for
the estimation of the operating temperature).
Nevertheless, as mentioned in Description on page 6 the device can manage a continuos
output current of 4 A in most of the application conditions.
However the rated continuos current is 5 A and the rated RMS current of the power
elements is 4.5 A, where:
and the duty cycle D:
Fixing the limit of 4.5 A for IRMS HS and IRMS LS the maximum output current can be derived,
as illustrated in Figure 18.
Figure 18.
Maximum continuos output current vs. duty cycle
I
RMS HS
I
LOAD
D
=
I
RMS LS
I
LOAD
1D
=
D
V
OUT
R
DS ON LS
DCR
+
() I
LOAD
+
V
IN
R
DS ON LS
R
DS ON HS
() I
LOAD
+
----------------------------------------------------------------------------------------------------
=
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