参数资料
型号: L5988D
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装: LEAD FREE, HTSSOP-16
文件页数: 30/52页
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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相关代理商/技术参数
参数描述
L5988DTR 功能描述:直流/直流开关调节器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
L5989D 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
L5989DTR 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
L5991 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
L5991_01 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY