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: 31/52页
文件大小: 1858K
代理商: L5988D
L5988D
Application information
Doc ID 15324 Rev 3
37/52
6.6
Thermal considerations
The thermal design is important to prevent the thermal shutdown of the device if the junction
temperature goes above 150 °C. The three different sources of losses within the device are:
a)
conduction losses due to the not negligible RDSON of the power switch; these are
equal to:
Where D is the duty cycle of the application. Note that the duty cycle is theoretically given by
the ratio between VOUT an VIN, but actually it is quite higher to compensate the losses of the
regulator. So the conduction losses increases compared with the ideal case.
b)
switching losses due to power MOSFET turn ON and OFF; these can be
calculated as:
Where TRISE and TFALL represent the switching times of the power element that cause the
switching losses when driving an inductive load (see Figure 20). TSW is the equivalent
switching time.
Figure 20.
Switching losses
c)
Quiescent current losses, calculated as:
where IQ is the quiescent current.
P
ON
R
DSON_HS
I
OUT
()
2
DR
DSON_LS
I
OUT
()
2
1D
()
+
=
P
SW
V
IN
I
OUT
T
RISE
T
FALL
+
()
2
------------------------------------------- Fsw
V
IN
I
OUT
T
SW
F
SW
==
P
Q
V
IN
I
Q
=
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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