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参数资料
| 型号： | L5989DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, HTSSOP-16 |
| 文件页数： | 32/51页 |
| 文件大小： | 1947K |
| 代理商： | L5989DTR |
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Application information
L5989D
38/51
Doc ID 15778 Rev 3
The red trace represents the maximum power which can be taken away as calculated
above, whilst the purple trace is the total internal losses.
As a consequence, given these operating conditions, the system can manage a continuos
output current up to 4.2 A. The device could deliver a continuos output current up to 5 A to
the load (see Chapter 6.5), however the maximum power loss of 2.5 W is reached with an
output current of 4.2 A, so the maximum output power is derated.
The calculation of the internal power losses must be done for each specific operating
condition given by the final application.
instead of 12 V: the lower contribution of the switching losses, which are proportional to the
input voltage, increases the maximum output current from 4.2 A to 4.5 A (see Figure 21).
Conditions: VIN = 5 V, VOUT = 1.2 V, fSW = 400 kHz
Figure 21.
Estimation of the internal power losses
In applications where the current to the output is pulsed, the thermal impedance should be
considered instead of the thermal resistance. Also, in these conditions, the current
limitations described in Chapter 6.5 are no more valid since they are related to continuos
output current delivery.
The thermal impedance of the system could be much lower than the thermal resistance,
which is a static parameter. As a consequence the maximum power losses can be higher
than 2.5 W if a pulsed output power is requested from the load:
So, depending on the pulse duration and its frequency, the maximum output current (even
more than 5 A) can be delivered to the load.
P
MAX t
()
ΔT
Z
TH t
()
-----------------
T
J MAX
T
AMB
–
Z
TH t
()
--------------------------------------
==
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| 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 |
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| L5991AD | 功能描述:开关变换器、稳压器与控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L5991AD13TR | 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 |
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