參數(shù)資料
型號: L5988D
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: LEAD FREE, HTSSOP-16
文件頁數(shù): 30/52頁
文件大小: 1858K
代理商: L5988D
Application information
L5988D
36/52
Doc ID 15324 Rev 3
6.5
R.M.S. current of the embedded power MOSFETs
The L5988D 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 19..
Figure 19.
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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L5988DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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