參數資料
型號： L5989D
廠商： STMICROELECTRONICS
元件分類： 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
文件頁數： 30/51頁
文件大?。?/td> 1947K
代理商： L5989D
Application information
L5989D
36/51
Doc ID 15778 Rev 3
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 19). TSW is the equivalent
switching time.
Figure 19.
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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相關代理商/技術參數
參數描述
L5989DTR 功能描述:直流/直流開關調節(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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5991 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
L5991_01 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY
L5991A 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
L5991AD 功能描述:開關變換器、穩(wěn)壓器與控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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